An electric meter that is configured to regenerate meter state data after a power loss includes a memory with at least one volatile and non-volatile memory device and a processor connected to the memory. The processor is configured to retrieve a backup copy of meter state data and a plurality of meter input data samples that were generated after the backup copy of the meter state data and prior to the power loss from a nonvolatile memory device. The processor is configured to regenerate meter state data by updating the backup copy of meter state data with the plurality of meter input data samples to regenerate the meter state data at the time of a final meter input data sample prior to the power loss.
G06F 11/14 - Error detection or correction of the data by redundancy in operation, e.g. by using different operation sequences leading to the same result
G06F 11/07 - Responding to the occurrence of a fault, e.g. fault tolerance
2.
Detection of deteriorated electrical connections in a meter using temperature sensing and time variable thresholds
A utility meter includes a meter housing that supports at least one current coil, a temperature sensor, and a processing circuit coupled to both. The current coil can be coupled to receive heat energy from a meter socket. The temperature sensor disposed generates a sensor signal based on a temperature within the meter housing. The processing circuit obtains the sensor signal and generates meter temperature information based at least in part thereon. The processing circuit also obtains a first predetermined threshold based on at least one of time of day information and date information. The processing circuit also determines whether an abnormal condition exists by comparing the meter temperature information to a value based on the first predetermined threshold, and generates an output signal to a memory, display or communication circuit responsive to determining that the abnormal condition exists.
G01R 35/04 - Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
3.
SYSTEM AND METHOD FOR ELECTRIC METER OUTAGE TIME DETECTION
A method identifies a duration of power interruptions in an electrical monitoring system. The method includes receiving, with an external monitoring system, a load profile from an electric meter that includes at least one of an accumulated frequency measurement and an accumulated number of zero crossing events that the electric meter records in an AC power signal during a predetermined monitoring period, and identifying a total duration of at least one power interruption during the predetermined monitoring period based on at least one of a deviation of the accumulated frequency measurement in the load profile from a predetermined accumulated frequency value or a deviation of the accumulated number of zero crossing events in the load profile from a predetermined number of zero crossing events during the predetermined monitoring period.
A method identifies a duration of power interruptions in an electrical monitoring system. The method includes receiving, with an external monitoring system, a load profile from an electric meter that includes at least one of an accumulated frequency measurement and an accumulated number of zero crossing events that the electric meter records in an AC power signal during a predetermined monitoring period, and identifying a total duration of at least one power interruption during the predetermined monitoring period based on at least one of a deviation of the accumulated frequency measurement in the load profile from a predetermined accumulated frequency value or a deviation of the accumulated number of zero crossing events in the load profile from a predetermined number of zero crossing events during the predetermined monitoring period.
A method identifies a duration of power interruptions in an electrical monitoring system. The method includes receiving, with an external monitoring system, a load profile from an electric meter that includes at least one of an accumulated frequency measurement and an accumulated number of zero crossing events that the electric meter records in an AC power signal during a predetermined monitoring period, and identifying a total duration of at least one power interruption during the predetermined monitoring period based on at least one of a deviation of the accumulated frequency measurement in the load profile from a predetermined accumulated frequency value or a deviation of the accumulated number of zero crossing events in the load profile from a predetermined number of zero crossing events during the predetermined monitoring period.
A method determines temperature information associated with a current coil connection in a meter. The method includes conveying heat from a current coil connection to a location proximate a winding disposed about a core. The core includes an opening through which a current carrying coil is disposed, the current carrying coil carrying current measured by the meter. The method also includes measuring a resistance of the winding disposed about a core, wherein the winding has a resistance that varies as a function of temperature. The method includes determining a temperature value based on the measured resistance and storing or communicating the determined temperature value.
G01R 31/67 - Testing the correctness of wire connections in electric apparatus or circuits
H02H 7/04 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for transformers
G01K 7/16 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat using resistive elements
An electric meter that is configured to regenerate meter state data after a power loss includes a memory with at least one volatile and non-volatile memory device and a processor connected to the memory. The processor is configured to retrieve a backup copy of meter state data and a plurality of meter input data samples that were generated after the backup copy of the meter state data and prior to the power loss from a nonvolatile memory device. The processor is configured to regenerate meter state data by updating the backup copy of meter state data with the plurality of meter input data samples to regenerate the meter state data at the time of a final meter input data sample prior to the power loss.
G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
8.
Device and method for data preservation and power loss recovery in an electric meter
An electric meter that is configured to regenerate meter state data after a power loss includes a memory with at least one volatile and non-volatile memory device and a processor connected to the memory. The processor is configured to retrieve a backup copy of meter state data and a plurality of meter input data samples that were generated after the backup copy of the meter state data and prior to the power loss from a non-volatile memory device. The processor is configured to regenerate meter state data by updating the backup copy of meter state data with the plurality of meter input data samples to regenerate the meter state data at the time of a final meter input data sample prior to the power loss.
An electric meter that is configured to regenerate meter state data after a power loss includes a memory with at least one volatile and non-volatile memory device and a processor connected to the memory. The processor is configured to retrieve a backup copy of meter state data and a plurality of meter input data samples that were generated after the backup copy of the meter state data and prior to the power loss from a nonvolatile memory device. The processor is configured to regenerate meter state data by updating the backup copy of meter state data with the plurality of meter input data samples to regenerate the meter state data at the time of a final meter input data sample prior to the power loss.
G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
10.
Electric meter contact arc detector employing dual-purposed inductive components
An electricity meter includes a pair of terminals configured to connect in-line with a power line, an electrical conductor within the electric meter connecting the pair of terminals through a switch that includes an electric motor with an inductive coil, an inductive coil coupled to the electrical conductor, and a metrology circuit operatively connected to the electric motor in the switch. The metrology circuit includes a current sensor electrically connected to the inductive coil to measure an electric current that flows between the pair of terminals through the electrical conductor and an arc detection circuit electrically connected to one of the inductive coil coupled to the electrical conductor or the inductive coil in the electric motor, the arc detection circuit being configured to detect electrical arcs between the pair of terminals and the power line.
A power conversion arrangement includes first and an optional second power conversion stages. The first stage has an input configured to receive an input voltage, an output having a first output voltage, a controller, a variable resistance, and a feedback node having a feedback voltage. The feedback node is coupled to the output by a first impedance. The controller receives the feedback voltage, and drives the output such that the feedback voltage is substantially at a predetermined value. The variable resistance is coupled between the feedback node and a reference voltage (e.g., ground). The variable resistance has a resistance value that varies as a function of the input voltage. The second stage has an input operably coupled to receive the first output voltage. The second stage is configured to generate an output voltage having a level that is substantially constant independent of the level of the first output voltage.
H02M 3/156 - Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
12.
WIDE RANGE POWER SUPPLY FOR USE IN METERS AND OTHER DEVICES
A power conversion arrangement includes first and an optional second power conversion stages. The first stage has an input configured to receive an input voltage, an output having a first output voltage, a controller, a variable resistance, and a feedback node having a feedback voltage. The feedback node is coupled to the output by a first impedance. The controller receives the feedback voltage, and drives the output such that the feedback voltage is substantially at a predetermined value. The variable resistance is coupled between the feedback node and a reference voltage (e.g., ground). The variable resistance has a resistance value that varies as a function of the input voltage. The second stage has an input operably coupled to receive the first output voltage. The second stage is configured to generate an output voltage having a level that is substantially constant independent of the level of the first output voltage.
H02M 3/156 - Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
13.
Wide range power supply for use in meters and other devices
A power conversion arrangement includes first and an optional second power conversion stages. The first stage has an input configured to receive an input voltage, an output having a first output voltage, a controller, a variable resistance, and a feedback node having a feedback voltage. The feedback node is coupled to the output by a first impedance. The controller receives the feedback voltage, and drives the output such that the feedback voltage is substantially at a predetermined value. The variable resistance is coupled between the feedback node and a reference voltage (e.g., ground). The variable resistance has a resistance value that varies as a function of the input voltage. The second stage has an input operably coupled to receive the first output voltage. The second stage is configured to generate an output voltage having a level that is substantially constant independent of the level of the first output voltage.
H02M 3/156 - Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
H02M 7/06 - Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
14.
Method and system for hot socket detection and tampering detection in a utility meter
A fault detection system of a utility meter for measuring electrical energy consumed by a load includes at least one current transformer, a temperature sensor, and a processor. The at least one current transformer is configured to generate a current measurement signal based on a current provided to the load. The temperature sensor is configured to generate a temperature signal based on a detected temperature of the utility meter. The processor is operably connected to the at least one current transformer and to the temperature sensor. The processor is configured to generate a phase angle value corresponding to a phase angle of the current measurement signal. The processor is further configured to generate a fault signal responsive to the temperature signal indicating that the detected temperature is greater than a predetermined temperature value and the phase angle value indicating detection of a leading current.
G01R 31/00 - Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
G01R 35/04 - Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
G01R 21/06 - Arrangements for measuring electric power or power factor by measuring current and voltage
G01R 25/00 - Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
15.
System and method for filtering harmonic frequencies in an electrical energy meter
An electrical energy meter includes an A/D converter and a processing circuit. The A/D converter is configured to generate digital samples of voltage and current waveforms in a polyphase electrical system. The processing circuit is operably coupled to receive the digital samples from the A/D converter and to integrate over time at least one digital sample multiple times to produce a filtered value from which harmonic distortion has been removed, identify a fundamental frequency only electrical parameter measurement for the polyphase electrical system with reference to the filtered value, and store the identified fundamental frequency only electrical parameter measurement in a data store.
G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
16.
Detection of deteriorated electrical connections in a meter using temperature sensing and time-variable thresholds
A utility meter includes a meter housing that supports at least one current coil, a temperature sensor, and a processing circuit coupled to both. The current coil can be coupled to receive heat energy from a meter socket. The temperature sensor disposed generates a sensor signal based on a temperature within the meter housing. The processing circuit obtains the sensor signal and generates meter temperature information based at least in part thereon. The processing circuit also obtains a first predetermined threshold based on at least one of time of day information and date information. The processing circuit also determines whether an abnormal condition exists by comparing the meter temperature information to a value based on the first predetermined threshold, and generates an output signal to a memory, display or communication circuit responsive to determining that the abnormal condition exists.
A utility meter includes a meter housing in which are supported at least one current coil, a temperature sensor, and a processing circuit. The current coil can be coupled to receive heat energy from within or on the meter socket. The temperature sensor generates a sensor signal based on a temperature within the meter housing. The processing circuit is operably coupled to the temperature sensor and the at least one current coil. The processing circuit obtains the sensor signal and generates temperature information therefrom, and also generates measurements of current through the current coil. The processing circuit generates an adjustment based at least on the square of the measured current, and determines whether an abnormal condition exists based on the temperature information, the adjustment, and a threshold. The processing circuit can generate an output signal to a display or communication circuit responsive to determining that the abnormal condition exists.
G01R 31/04 - Testing connections, e.g. of plugs or non-disconnectable joints
G01R 35/04 - Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
An electricity meter includes a disconnect switch connected to a service transformer, a line-side sense circuit, a load-side sense circuit, and a measurement and control circuit. The disconnect switch is configured to receive a phase voltage and an anti-phase voltage from the service transformer. The line-side sense circuit includes a first sense circuit configured to detect the phase voltage delivered to the electricity meter and a second sense circuit configured to detect the anti-phase voltage delivered to the electricity meter, the first sense circuit and the second sense circuit are each connected to a floating reference node. The load-side sense circuit is configured to detect the existence of a phase load and an anti-phase load at a service entrance. The measurement and control circuit is configured to receive a phase output voltage and an anti-phase output voltage from the line-side sense circuit and further configured to receive a phase load output voltage and anti-phase load output voltage from the load-side sense circuitry.
A method is used in a utility meter having an arm bit and a seal bit. The method includes changing a state of the arm bit to a first state in response to a first set of conditions. The method also includes removing electrical power from the meter. Upon subsequently applying electrical power to the meter, a first signal in a meter processing circuit indicates whether a meter cover is installed or the meter cover is removed. The processing circuit changes the seal bit to a first state responsive to a condition in which the arm bit is in the first state and the first signal indicates that the meter cover is installed. The processing circuit changes the seal bit to a second state responsive to a condition in which the seal bit is in the first state and the first signal indicates that the meter cover is removed.
An electrical utility meter includes metering circuitry configured for connection to at least one utility power line and a service disconnect member. The metering circuitry is configured to receive an electrical signal corresponding to a line voltage on the at least one utility power line. The service disconnect member is configured for connection to the at least one utility power line. A control circuit is configured to deliver a control signal to the service disconnect member synchronously with a zero crossing of the electrical signal corresponding to the line voltage on the at least one utility power line.
H01H 9/56 - Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
H01H 9/30 - Means for extinguishing or preventing arc between current-carrying parts
H01H 47/18 - Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
21.
METHOD AND SYSTEM FOR HOT SOCKET DETECTION IN A UTILITY METER
An arrangement for use in a utility meter comprises a transformer, a voltage source, a sensor, and a processor. The transformer includes a primary winding, a first secondary winding, and a second secondary winding. The voltage source is operably connected to generate a voltage signal and to provide the voltage signal to the first secondary winding. The generated voltage signal has a corresponding current formed at least in part by an impedance defined in part by a permeability of the transformer. The sensor is operably connected to generate a permeability signal indicative of the corresponding current. The processor is operably connected to the sensor and is configured to generate a hot socket detection signal responsive to the permeability signal indicating that the permeability of the transformer has fallen below a threshold value.
An arrangement for use in a utility meter comprises a transformer, a voltage source, a sensor, and a processor. The transformer includes a primary winding, a first secondary winding, and a second secondary winding. The voltage source is operably connected to generate a voltage signal and to provide the voltage signal to the first secondary winding. The generated voltage signal has a corresponding current formed at least in part by an impedance defined in part by a permeability of the transformer. The sensor is operably connected to generate a permeability signal indicative of the corresponding current. The processor is operably connected to the sensor and is configured to generate a hot socket detection signal responsive to the permeability signal indicating that the permeability of the transformer has fallen below a threshold value.
An arrangement for use in a utility meter includes a transformer, a voltage source, a sensor, and a processor. The transformer includes a primary winding, a first secondary winding, and a second secondary winding. The voltage source is operably connected to generate a voltage signal and to provide the voltage signal to the first secondary winding. The generated voltage signal has a corresponding current formed at least in part by an impedance defined in part by a permeability of the transformer. The sensor is operably connected to generate a permeability signal indicative of the corresponding current. The processor is operably connected to the sensor and is configured to generate a hot socket detection signal responsive to the permeability signal indicating that the permeability of the transformer has fallen below a threshold value.
G01R 31/04 - Testing connections, e.g. of plugs or non-disconnectable joints
G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
G01R 21/00 - Arrangements for measuring electric power or power factor
G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
G01R 35/00 - Testing or calibrating of apparatus covered by the other groups of this subclass
G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
G01R 31/12 - Testing dielectric strength or breakdown voltage
24.
Detecting current measurement tampering by current transformer parallel impedance
A method detects an error in a meter having a current transformer, a burden resistor unit and a resistive path switchably connectable across the burden resistor unit. The method includes obtaining in the processing circuit a first value representative of the voltage magnitude across the burden resistor unit while the resistive path is operably decoupled across the burden resistor unit. The method also includes closing a switching element to operably couple the resistive path across the burden resistor unit, and obtaining in a processing circuit a second value representative of a voltage magnitude across the burden resistor unit. The method further includes determining in the processing circuit whether an error exists based on the first value, the second value, and at least one predetermined stored value.
A sensor includes a core, first and second windings, an integrating amplifier circuit and a DC stabilization circuit. The first and second windings are wrapped around the core. The integrating amplifier circuit has a first input coupled to receive a sensed current from the first winding, and an output operably coupled to provide a current the second winding. The integrating amplifier circuit is configured to generate a phase shift from an input current received at the first input and the current provided to the second winding. The DC stabilization circuit includes a first resistive path coupled between the output of the integrating amplifier circuit and the first input of the integrating amplifier circuit, and a second resistive path coupled between the first winding and the first input of the integrating amplifier circuit.
G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
26.
Arrangement for detecting a meter maintenance condition using winding resistance
An arrangement for use in a utility meter is disclosed. The arrangement includes a meter blade coupled to a current coil. The arrangement further includes a current sensor that includes a winding about a core. The current sensor is in a current sensing relationship with the current coil. The winding has a resistance that varies as a function of temperature. The arrangement further includes a processing circuit that is operably coupled to receive a measurement signal from the winding. The processing circuit is configured to determine a DC component of the measurement signal, determine the resistance of the winding based at least in part on the determined DC component, and cause a value representative of the determined resistance to be displayed or communicated to an external device.
A method determines temperature information associated with a current coil connection in a meter. The method includes conveying heat from a current coil connection to a location proximate a winding disposed about a core. The core includes an opening through which a current carrying coil is disposed, the current carrying coil carrying current measured by the meter. The method also includes measuring a resistance of the winding disposed about a core, wherein the winding has a resistance that varies as a function of temperature. The method includes determining a temperature value based on the measured resistance and storing or communicating the determined temperature value.
G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
G01R 27/02 - Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
G01R 19/165 - Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
An arrangement for use in a utility meter includes at least one circuit path, a three phase service switch, and a three phase monitoring unit. The at least one circuit path operably couples a source of electrical energy to a load. The service switch is operably coupled to the at least one circuit path and is configurable in an open state and a closed state. The monitoring unit is operably coupled to the at least one circuit path between the load and the service switch and is configured to detect a presence and an absence of line voltage on the load. The monitoring unit is further configured (i) to generate an open circuit signal responsive to the detection of the absence of line voltage on the load, and (ii) to generate a closed circuit signal responsive to the detection of the presence of line voltage on the load.
G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
G01R 31/04 - Testing connections, e.g. of plugs or non-disconnectable joints
G01R 1/00 - MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES - Details of instruments or arrangements of the types covered by groups or
H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
G01R 19/04 - Measuring peak values of ac or of pulses
G01R 19/175 - Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
G01R 21/06 - Arrangements for measuring electric power or power factor by measuring current and voltage
G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
29.
Utility meter having data logging with power loss recovery
A method for storing information within a utility meter that includes storing a data stream comprising a plurality of data values regarding a metered quantity delivered to a load corresponding to a plurality of time periods, wherein the plurality of data values are stored sequentially based on their corresponding time periods. The method also includes responsive to a power outage, inserting into the data stream a time stamp corresponding to a time period in the plurality of time periods in which the power outage occurred.
G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
An arrangement for use in a utility meter includes an actuator element configured for linear movement. The actuator is operably coupled to receiving moving power from a prime mover, and includes a plurality of receptacles for corresponding contact arms of a switch within an electricity meter. Each receptacle is defined by an outer bar, an inner bar, and opposing stiffening elements. The outer bar is configured to engage a first surface of a contact arm element when the switch is in a first position, and the inner bar configured to engage a second surface of the contact arm element when the switch is in a second position.
A utility meter configured for connection to an AC power line includes a meter housing with a plurality of electronic components arranged within the meter housing and configured to provide consumption data. A power supply is also arranged within the meter housing. The power supply is configured to receive an AC voltage from the AC power line and supply a DC voltage to the electronic components. An AC line voltage booster is positioned connected to the power supply. The AC line voltage booster is configured to increase the voltage from the AC power line received by the power supply.
A utility meter configured for connection to an AC power line includes a meter housing with a plurality of electronic components arranged within the meter housing and configured to provide consumption data. A power supply is also arranged within the meter housing. The power supply is configured to receive an AC voltage from the AC power line and supply a DC voltage to the electronic components. An AC line voltage booster is positioned connected to the power supply. The AC line voltage booster is configured to increase the voltage from the AC power line received by the power supply.
G01R 21/06 - Arrangements for measuring electric power or power factor by measuring current and voltage
H02M 5/04 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
H02M 7/06 - Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
H02M 1/00 - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF - Details of apparatus for conversion
A method is used in a utility meter having an arm bit and a seal bit. The method includes changing a state of the arm bit to a first state in response to a first set of conditions. The method also includes removing electrical power from the meter. Upon subsequently applying electrical power to the meter, a first signal in a meter processing circuit indicates whether a meter cover is installed or the meter cover is removed. The processing circuit changes the seal bit to a first state responsive to a condition in which the arm bit is in the first state and the first signal indicates that the meter cover is installed. The processing circuit changes the seal bit to a second state responsive to a condition in which the seal bit is in the first state and the first signal indicates that the meter cover is removed.
A current measurement circuit includes an integrator, first and second transformers, and a current measurement unit. The first transformer includes a first winding about a magnetic core. The magnetic core has an opening through which a current to be measured passes. The first winding is configured to generate a first current based on a first flux in the magnetic core. The second transformer includes second and third windings. The second winding is coupled to receive the first current from the first winding. The second winding has a terminal coupled to the third winding. The third winding is coupled to a first input of the integrator circuit. The output of the integrator circuit is operably coupled to provide an error current to the second transformer. The current measurement unit measures the current through the second winding of the second transformer.
G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
A meter cover removal detection arrangement includes a switch element, a pivoting lever arm, a meter cover and a plunger. The switch element has first and second positions, and conducts electricity between first and second contacts in only one of the first position and the second position. The pivoting lever arm has two arm positions, and is operably coupled to cause the switch element to be in the second position when the lever arm is in a second arm position. The lever arm engages a spring that biases the level arm toward the second arm position. The meter cover has an inward extending cam. The plunger has first and second plunger positions, and is operably coupled to hold the pivoting lever arm in the first arm position when the plunger is in the first plunger position. The cam engages the plunger to hold the plunger in the first plunger position when the meter cover is installed on a meter base. The cam is disengaged from the plunger when the meter cover is removed.
An arrangement for use in an electricity meter includes a sensor and a processing circuit. The sensor is supported directly or indirectly by a meter housing. The sensor is configured to measure a magnetic field in proximity to a current sensor of the electricity meter. The sensor is also configured to generate a measurement signal representative of, at least in part, a magnitude of the magnetic field. The processing circuit is operably coupled to receive first information representative of the measurement signal. The processing circuit is configured to obtain a first value representative of the magnetic field based on the first information, and determine a first adjustment value responsive to a determination that the first value exceeds the first threshold value. The processing circuit is further configured to generate energy consumption information based at least in part on the first adjustment value.
An arrangement for use in a utility meter includes a sensor and a processing circuit supported by a base of the meter, and a magnetic element carried by the cover of the meter, in which the cover is removably mounted to the base. The sensor includes at least two magnetizable elements, such as inductors, that are magnetized at opposite polarities when the meter is closed and operable. The magnetizable elements are positioned in very close proximity so that as cover is removed the magnetic element passes the elements to cause the magnetizable elements to assume the same polarity. The processing circuit continuously polls the magnetizable elements to evaluate their respective polarities and is configured to issue a tamper indication when the detected polarities are the same.
G01B 7/14 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
G01R 11/24 - Arrangements for avoiding or indicating fraudulent use
G01D 5/20 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
A circuit for use in a switched mode power supply comprising includes an integrated circuit, a transformer, a capacitor, a low voltage circuit and a current limiting resistor. The IC jitters the switching frequency of the switch based on a bias voltage of the integrated circuit. The IC also includes a current source configured to supply current for operation of the switching regulator when insufficient current is available from the bias input pin. The transformer includes primary, secondary and auxiliary windings. The primary winding receives a rectified line voltage and is coupled to the switch. The capacitor is coupled between the bias input pin and ground. The low voltage circuit is coupled to the auxiliary winding, and provides current to the bias input pin. The current limiting resistor limits current produced by the low voltage circuit to less than that required for operation of the IC.
H02M 3/335 - Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
39.
Electricity meter isolated physical layer ethernet interface
A metering arrangement includes at least a first and second meter. The first meter includes a first metrology circuit, an Ethernet controller, and an isolation circuit. The first metrology circuit has a first data interface. The Ethernet controller has an Ethernet port and a conversion circuit coupled to convert Ethernet standard signals having a first communication protocol to signals of a second communication protocol. The isolation circuit is coupled between the Ethernet controller and the first data interface. The Ethernet controller is operably coupled to communicate data with the first data interface via the isolation circuit, and the conversion circuit is further operably coupled to communicate data via the first data port. The second meter includes a second metrology circuit having a second data interface operably connected to a second data port. The second data port is operably coupled to communicate data with the first data port.
G08B 23/00 - Alarms responsive to unspecified undesired or abnormal conditions
G08C 15/06 - Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division
G08C 19/22 - Electric signal transmission systems in which transmission is by pulses by varying the duration of individual pulses
H04Q 9/00 - Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
An arrangement for measuring an internal clock within an electricity meter includes an optical communication circuit within the meter, an optical detector external to the meter, and a frequency counter. The optical communication circuit within the electricity meter is operably coupled to receive a pulse output of the meter's internal clock, and is further configured to generate a corresponding optical pulse representative of the pulse output. The optical detector is configured to detect the pulse output via an optical port of the electricity meter. The frequency counter is operably coupled to receive from the optical detector a signal that is representative of the detected pulse output.
G01R 35/04 - Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
A method measures a resistance of an element that is operably coupled to receive an AC line voltage. The method includes obtaining a first voltage measurement value V1A from a first side of the element at a first time, and obtaining a second voltage measurement value V2A from a second side of the element at the first time. The method also includes obtaining a first current measurement value IA through the element at the first time, and obtaining a second current measurement value IB through the element at the second time. The method further includes obtaining a third voltage measurement value V1B from the first side of the element at a second time, and obtaining a fourth voltage measurement value V2B from the second side of the element at the second time. The processing device determines the resistance at least in part based on the values V1A, V2A, V1B, V2B, IA and IB. The determination based on an adjusted difference of V2B and V2A.
A method of detecting a magnetic coupling in a meter includes obtaining in an electricity meter information representative of power consumption as measured within the meter of a plurality of lines of an electrical service. The method also includes obtaining from a magnetic sensor information representative of a magnetic field within an electricity meter. A processing circuit then determines whether a first condition exists wherein the magnetic field exceeds a first threshold and the information representative of the power consumption indicates a load imbalance on the plurality of lines such that the load imbalance exceeds an imbalance threshold. The method further includes performing a processing step responsive to a determination that the first condition exists.
A method of detecting a magnetic coupling in a meter includes obtaining in an electricity meter information representative of power consumption as measured within the meter of a plurality of lines (103) of an electrical service. The method also includes obtaining from a magnetic sensor (108) information representative of a magnetic field within an electricity meter (100). A processing circuit (112) then determines whether a first condition exists wherein the magnetic field exceeds a first threshold and the information representative of the power consumption indicates a load imbalance on the plurality of lines such that the load imbalance exceeds an imbalance threshold. The method further includes performing a processing step responsive to a determination that the first condition exists.
A method measures a resistance of an element (120a, 120b) that is operably coupled to receive an AC line voltage. The method includes obtaining a first voltage measurement value V1A from a first side of the element at a first time, and obtaining a second voltage measurement value V2A from a second side of the element at the first time. The method also includes obtaining a first current measurement value IA through the element at the first time, and obtaining a second current measurement value IB through the element at the second time. The method further includes obtaining a third voltage measurement value VIB from the first side of the element at a second time, and obtaining a fourth voltage measurement value V2B from the second side of the element at the second time. A processing device (118) determines the resistance at least in part based on the values V1A,V2A V1B, V2B, IA and IB. The determination is based on an adjusted difference of V2B and V2A.
A method for controllably disconnecting a utility power service from a load includes a step of receiving a disconnect command at a control circuit within a utility meter housing. Then, responsive to receiving the disconnect command, using the control circuit to provide a first signal to a first switch operably connecting a charging circuit to an energy storage device. The method also includes charging, at least in part, the energy storage device via the charging circuit. After charging the energy storage device at least in part, a second signal is provided to a second switch that operably connects the energy storage device to the electrically powered source of motive force such that the electrically-powered source of motive force causes a service switch to controllably interrupt the connection between a utility power service and a load.
H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
A sensor includes a core, first and second windings, an integrating amplifier circuit and a DC balancing circuit. The first and second windings are wrapped around the core. The integrating amplifier circuit has a first input coupled to the first winding, and an output operably coupled to the second winding. The DC balancing circuit is operably coupled between the output of the integrating amplifier circuit and the first input of the integrating amplifier circuit.
G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
47.
Method for improving common mode rejection in a rogowski coil-based circuit
A sensor includes a non-magnetic core having a first winding wrapped thereon. The first winding has a center tap dividing the first winding into a first winding portion and a second winding portion. The center tap is coupled to a reference voltage. The first winding portion and the second winding portion are configured to sense first AC signals, and have a balanced susceptibility to second AC signals. The differential integrating circuit is configured to provide common mode rejection of the second AC signals. The differential integrator circuit is operably coupled to the first winding portion and the second winding portion.
G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
A method for storing information within a utility meter includes generating in a processing circuit first information regarding a metered quantity delivered to a load corresponding to a first period of time. The method also includes obtaining a first value associated with one of a plurality of predetermined ranges of values in which the first information falls. The method further includes generating in a processing circuit a second value representative of a numerical position of the first information within the one of the plurality of predetermined ranges of values. The first value and the second value are stored in a memory.
CB. The processing circuit is further configured to provide information representative of the VA calculation to one of a group consisting of a display, a communication circuit, a memory and a billing calculation unit.
G01R 21/00 - Arrangements for measuring electric power or power factor
G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
G01R 21/133 - Arrangements for measuring electric power or power factor by using digital technique
An arrangement includes an A/D converter and a processing circuit. The A/D converter is configured to generate digital samples of voltage and current waveforms in a polyphase electrical system. The processing circuit is operably coupled to receive the digital samples from the A/D converter. The processing circuit configured is to obtain contemporaneous phase current and voltage samples I A , I B , I C and/or I N , and V A , V B , V C . The processing circuit is further configured to determine at least I CB sample values based on three of the current samples of I A , I B , I C , and I N , and determine a VA value based at least in part on I CB . The processing circuit is further configured to provide information representative of the VA calculation to one of a group consisting of a display, a communication circuit, a memory and a billing calculation unit.
A method for storing information within a utility meter includes generating in a processing circuit first information regarding a metered quantity delivered to a load corresponding to a first period of time. The method also includes obtaining a first value associated with one of a plurality of predetermined ranges of values in which the first information falls. The method further includes generating in a processing circuit a second value representative of a numerical position of the first information within the one of the plurality of predetermined ranges of values. The first value and the second value are stored in a memory.
G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
An arrangement for measuring electrical energy consumption includes an input circuit operable to generate a first signal representative of a line voltage waveform and a second signal representative of a line current waveform. The arrangement further includes a processing circuit operable to generate energy consumption data based on the first signal and the second signal. The processing circuit is further operable to generate a first pulse waveform having a plurality of output pulses based on the energy consumption data, each output pulse corresponding to a quantity of energy consumed. The arrangement further includes a wireless transmitter coupled to the processing circuit, the wireless transmitter configured to transmit an RF signal each time the first pulse waveform changes state.
G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
G01R 21/06 - Arrangements for measuring electric power or power factor by measuring current and voltage
H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
53.
Mechanical switch activity detection on power outage
A circuit arrangement for use in a utility meter includes a mechanical switch, a processor device, and a latch circuit. The mechanical switch has a closed position and an open position, and is supported by a meter housing. The mechanical switch is operably coupled to generate a close signal when the mechanical switch is in the closed position. The processor device has a first processor input and a second processor input. The first processor input is operably coupled to receive the close signal. The latch circuit is operably coupled to receive the close signal and generate a latched signal responsive thereto. The latch circuit is configured to latch the latched signal for a predetermined time, the predetermined time corresponding to a wake-up time of the processor device. The latch circuit is operably coupled to provide the latched signal to the second processor input.
A circuit arrangement for use in a utility meter includes a processing circuit, a magnetically-actuated switch, and a first circuit. The processing circuit has a first mode and a second mode. The processing circuit performs a first set of metering operations related to energy metering in the first mode, and a second set of operations in the second mode or sleep mode. The second set of operations has fewer operations than the first set of operation, and requires less energy. The switch has is coupled to provide a first output signal to the processing circuit. The first circuit is configured to generate a pulse signal responsive to the switch transitioning states, and is operably coupled to provide the pulse signal to the processing circuit. The processing circuit causes display of stored values responsive to receiving the pulse and receiving the first output signal.
A circuit arrangement generates an output oscillating signal indicative of voltage on any of plurality of line voltages. The circuit arrangement includes at least two zero-crossing detectors, a combiner, an integrator, and an oscillator. The first zero-crossing detection circuit detects a voltage level crossing on a first electrical signal corresponding to a first line voltage. The second zero-crossing detection circuit detects a voltage level crossing on a second electrical signal corresponding to a second line voltage. The combiner combines the output signals of the first zero-crossing detection circuit and the second zero-crossing detection circuit. The integrator is coupled to the output of the combiner. The oscillator has a control input and an oscillating signal output. The oscillator generates an oscillating signal at the oscillating signal output based on a signal present at the control input. The control input receives an output signal of the integrator.
H03K 5/00 - Manipulation of pulses not covered by one of the other main groups of this subclass
H03B 1/00 - GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS - Details
A system includes a utility meter housing, a power supply, a non-volatile memory, an energy storage device, and a control circuit. The utility meter housing includes metrology circuitry configured to generate metering data regarding electrical power provided to the load. The energy storage device is operably coupled to the power supply. The control circuit is operably coupled to receive power generated by the power supply and receive power from the energy storage device. The control circuit is configured to: receive a first bias power signal; erase first metering information stored in the non-volatile memory; process, subsequent to erasing the first memory location, metering data received from the metrology circuit; receive a first interruption signal indicative of an interruption of power in the power supply; and store, responsive to receiving the first interruption signal, second metering information in the non-volatile memory using power from the energy storage device.
G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
57.
Service voltage load protection in an electric utility meter
An arrangement for controllably disconnecting a utility power service from a load includes a utility meter housing, a switch and a processing circuit. The utility meter housing includes metrology circuitry configured to generate metering information regarding electrical power provided to the load. The switch is configured to controllably interrupt a connection between the utility power service and the load. The switch has an open state and a closed state. The processing circuit is configured to determine whether a line voltage varies from an expected value by more than a predetermined amount over a predetermined amount of time. The processing circuit is further configured to cause a change in state of the switch based on the determination.
H02H 3/20 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess voltage
H02H 9/04 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
H02H 3/027 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection - Details with automatic disconnection after a predetermined time
H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
H02H 3/247 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to undervoltage or no-voltage having timing means
58.
Power management arrangement and method in a utility meter
A method of controllably disconnecting a utility power service from a load includes generating in a metrology circuit of a meter metering information regarding electrical power provided to the load from the utility power service. The meter includes a service switch having a controller to controllably interrupt a connection between the utility power service and the load. The method also includes connecting an energy storage device to the controller responsive to a service disconnect command. The method further includes connecting at least a portion of the metrology circuit to the energy storage device and disconnecting a meter power supply from the portion of the metrology circuit responsive to a power interruption detection signal.
H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
59.
Magnetic tampering detection and correction in a utility meter
An arrangement for use in an electricity meter includes a sensor and a processing circuit. The sensor is supported directly or indirectly by a meter housing. The sensor is configured to measure a magnetic field in proximity to a current sensor of the electricity meter. The sensor is also configured to generate a measurement signal representative of, at least in part, a magnitude of the magnetic field. The processing circuit is operably coupled to receive first information representative of the measurement signal. The processing circuit is configured to obtain a first value representative of the magnetic field based on the first information, and determine a first adjustment value responsive to a determination that the first value exceeds the first threshold value. The processing circuit is further configured to generate energy consumption information based at least in part on the first adjustment value.
An electricity meter comprises a voltage sensor configured to determine an AC line voltage. A measurement circuit is coupled to the voltage sensor and is configured to determine energy consumption data based at least in part on the AC line voltage. A communications device is coupled to the measurement circuit and is configured to transmit the energy consumption data to a remote location. The electricity meter further includes a power supply configured to provide a DC voltage to the communications device. A switch is positioned between the power supply and the communications device. A switch controller is coupled to the measurement circuit and is configured to control the switch and the associated DC voltage supplied to the communications device depending at least in part on the AC line voltage.
H02M 3/335 - Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
G01R 19/165 - Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
H02H 3/20 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess voltage
G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
A capacitor charging circuit is provided in a utility meter. The utility meter includes a measurement circuit configured to provide consumption data, a memory configured to store the consumption data from the measurement circuit, and a communications device configured to transmit the consumption data to a remote location. The utility meter also includes a power supply configured to supply an unregulated DC voltage and a regulated voltage within the utility meter. The regulated DC voltage is output from a voltage regulator and is provided to the measurement circuit. The unregulated DC voltage is supplied to the communications device. The capacitor charging circuit is configured to charge a capacitor with the unregulated DC voltage when the regulated DC voltage is provided to the charging circuit from the voltage regulator. The capacitor charging circuit may be a supercapacitor charging circuit.
An electricity meter includes a sensor circuit, a measurement circuit, a leading PF detection circuit and a control circuit. The sensor circuit is operably connected to detect voltage and current provided to a load, and generates corresponding voltage and current measurement signals. The measurement circuit is configured to generate energy consumption information based on the voltage and current measurement signals. The leading PF detection circuit is configured to generate a first value representative of a phase difference of the current measurement signal with respect to the voltage measurement signal, and to generate a leading PF detection signal responsive to determining that the first value corresponds to a leading power factor that leads unity power factor by more than a predetermined threshold. The control circuit stores an indication in memory responsive at least in part to the leading PF detection signal.
G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
G01R 25/00 - Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
G01R 11/17 - Compensating for errors; Adjusting or regulating means therefor
G01R 33/02 - Measuring direction or magnitude of magnetic fields or magnetic flux
G01R 11/24 - Arrangements for avoiding or indicating fraudulent use
63.
Shock detection in a utility meter having reporting capability
An arrangement for use in a utility meter includes an accelerometer, a processing circuit, and a source of power. The accelerometer is configured to detect impact force on a utility meter housing. The processing circuit is operably coupled to receive information representative of detected shock events from the accelerometer, and is configured to store information regarding detected shock events in a non-volatile memory. The source of power is independent of a main meter power supply, and is operably connected to the processing circuit.
G01P 15/08 - Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces with conversion into electric or magnetic values
An arrangement for use in a utility meter includes a switch, a processing circuit, and a magnetic element. The switch is supported on a first meter structure. The switch has at least a first and second state. The switch is configured to transition from a first state to a second state responsive to a detected magnetic field of a first polarity, and to transition from a second state to a first state responsive to a detected magnetic field of a second polarity. The processing circuit is operably coupled to determine whether the switch is in the first state or the second state. The magnetic element is supported on a second meter structure configured to be physically connected to the first meter structure, the magnetic element positioned such that removal of the second meter structure from the first meter structure causes the magnetic element to expose the switch to a magnetic field of the first polarity.
An arrangement for measuring electrical energy consumption includes an input circuit operable to generate a first signal representative of a line voltage waveform and a second signal representative of a line current waveform. The arrangement further includes a processing circuit operable to generate energy consumption data based on the first signal and the second signal. The processing circuit is further operable to generate a first pulse waveform having a plurality of output pulses based on the energy consumption data, each output pulse corresponding to a quantity of energy consumed. The arrangement further includes a wireless transmitter coupled to the processing circuit, the wireless transmitter configured to transmit an RF signal each time the first pulse waveform changes state. The arrangement also includes an external device positioned remote from the electrical utility meter, the external device including a receiver configured to receive the RF signal.
An arrangement for controllably disconnecting a utility power service from a load includes a utility meter housing, a service switch, an energy storage device and a control circuit. The utility meter housing includes metrology circuitry configured to generate metering information regarding electrical power provided to the load. The service switch is configured to controllably interrupt a connection between the utility power service and the load, and has a controller. The control circuit is configured to cause the energy storage device to be connected to the controller responsive to a service disconnect command. The control circuit is further configured to cause a portion of the metrology circuit to be connected to the energy storage device and the meter power supply to be disconnected from the portion of the metrology circuit responsive to a power interruption detection signal.
H02H 3/06 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection - Details with automatic reconnection
67.
Method of timing demand and time-of-use functionality with external clock source
A method of associating chronological time with energy consumption includes a step of storing in a utility meter a plurality of energy consumption values, each energy consumption value corresponding to a time interval of a first type. The method also includes obtaining from a source external to the utility meter chronological time information regarding at least one of the plurality of energy consumption values. The method further includes associating each of the energy consumption values with a time interval of the second type, each time interval of the second type associated with at least one chronological time value.
An oscillator circuit includes a phase-locked loop, a crystal resonator, first and second capacitors, and first and second impedance elements. The phase-locked loop is coupled between a first node and a second node. The crystal resonator is also coupled between the first node and the second node. The first capacitor is coupled between the first node and ground, and the second capacitor is coupled between the second node and ground. The first impedance element is coupled in a first circuit path from the first node to ground through the first capacitor. The second impedance element is coupled in a second circuit path from the second node to ground through the second capacitor.
H03B 5/30 - Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
G01R 27/28 - Measuring attenuation, gain, phase shift, or derived characteristics of electric four-pole networks, i.e. two-port networks; Measuring transient response
G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
G01R 11/16 - Adaptations of counters to electricity meters
H03B 5/36 - Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
69.
Fault tolerant service switch operation in a utility meter
An arrangement for controllably disconnecting a utility power service from a load includes a meter housing, a service switch, an electrically-powered source of motive force, and energy storage device, and a charging circuit. The meter housing includes metrology circuitry configured to generate metering information regarding electrical power provided to the load. The service switch is configured to controllably interrupt a connection between the utility power service and the load. The electrically-powered source of motive force is configured to cause the service switch to controllably interrupt the connection between the utility power service and the load. The energy storage device is operably connected to provide power to the electrically-powered source of motive force. The charging circuit is configured to provide charging energy to the energy storage device. The energy storage device is configured to provide sufficient power to the electrically-power source of motive force after being at least partially charged by the charging circuit. The arrangement further includes a control circuit configured to provide a first signal to a first switch operably connecting the energy storage device to the electrically powered source of motive force, and to provide a second signal to a second switch operably connecting the charging circuit to the energy storage device. The control circuit is configured to receive a disconnect command signal, and to provide the second signal and the first signal in sequence responsive to receiving the disconnect command signal.
An arrangement for measuring an internal clock within an electricity meter includes an optical communication circuit within the meter, an optical detector external to the meter, and a frequency counter. The optical communication circuit within the electricity meter is operably coupled to receive a pulse output of the meter's internal clock, and is further configured to generate a corresponding optical pulse representative of the pulse output. The optical detector is configured to detect the pulse output via an optical port of the electricity meter. The frequency counter is operably coupled to receive from the optical detector a signal that is representative of the detected pulse output.
An arrangement for recording seismic events includes an electricity meter sensor circuit, a digital processing circuit, and an accelerometer operably connected to the digital processing circuit. The accelerometer is configured to provide signals representative of seismic information to the digital processing circuit. A memory is configured to store data records relating to at least some of the seismic information.
A utility meter comprises a measurement circuit configured to measure consumption, a remote communications port, a local communications port, and a meter communications indicator. The meter communications indicator is configured to provide an indication that the meter is communicating with a remote device external to the meter over the remote communications port. The meter communications indicator is also configured to provide an indication that the meter is communicating with a local device external to the meter over the local communications port. The indication that communications are occurring over the local communications port is different from the indication that communications are occurring over the remote communications port. In at least one embodiment, the communications indicator is configured to provide an indication that communications are occurring simultaneously over the remote communications port and the local communications port.
A first embodiment is an arrangement, such as a meter programming device, that includes a memory, a user interface, a communication interface, and a processing circuit. The user interface arrangement is configured to receive user input. The communication interface is configured to communicate with a corresponding communication interface on a utility meter. The processing circuit is configured by software stored in the memory to: receive a user input at the user interface identifying a disconnect threshold as a measure of current; generate a disconnect threshold value as a function of the user input and a service voltage; and provide the disconnect threshold value to the utility meter via the communication interface.
G05B 21/00 - Systems involving sampling of the variable controlled
G05B 13/00 - Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
G08B 23/00 - Alarms responsive to unspecified undesired or abnormal conditions
G08C 15/06 - Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division
G08C 19/16 - Electric signal transmission systems in which transmission is by pulses
G05D 3/12 - Control of position or direction using feedback
A power supply arrangement for an electricity meter includes an input, a full wave rectifier, and a voltage doubler circuit. The input is configured to receive a periodical input signal. The full wave rectifier is coupled to the input and has a first output. The first output is coupled to a first load of the electricity meter. The voltage doubler circuit is coupled to the input and has a second output coupled to a second load of the electricity meter. The voltage doubler is configured to prevent the flow of current from the second output to the input.
H01F 27/42 - Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors or choke coils
G01R 22/00 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters
75.
Apparatus and method for metering contact integrity
An arrangement for use in connection with an electricity meter includes an electricity meter housing and at least one connection between a first conductor and a second conductor carrying line voltage. The arrangement further includes a processing circuit that is configured to obtain a first voltage measurement within the meter housing on a first side of the at least one connection, and to obtain a second voltage measurement on a second side of the at least one connection. The processing circuit is further configured to determine a value corresponding to an impedance across the at least one connection.
An arrangement includes an A/D converter and a processing circuit. The A/D converter is configured to generate digital samples of voltage and current waveforms in a polyphase electrical system. The processing circuit is operably coupled to receive the digital samples from the A/D converter. The processing circuit is further configured to combine a value substantially equal to two times the magnitude of the phase A current sample with the phase C current sample to generate a first value, and generate a VA calculation using the first value and at least one other value. The processing circuit is further configured to provide information representative of the VA calculation to one of a group consisting of a display, a communication circuit, and a billing calculation unit.
A utility meter comprises a measurement circuit configured to measure commodity consumption and provide consumption data. A memory in the meter is configured to store meter data including the consumption data. The memory includes a plurality of memory segments, each of the plurality of memory segments protected by a different password. The meter further comprises a receiver configured to receive a memory request and an associated password from a source external to the utility meter. A controller in the meter is configured to grant or deny the memory request depending upon the associated password received from the source external to the utility meter.
G08C 15/06 - Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division
A utility meter comprises a measurement circuit configured to measure consumption data, a memory configured to store meter data including the consumption data, and a receiver configured to receive a priority message from a source external to the utility meter. A meter display on the meter comprises a plurality of display segments. The meter display is configured to display the meter data according to a standard meter display routine. The meter display is further configured to display the priority message on at least a first portion of the plurality of display segments such that meter data normally displayed during the standard meter display routine is not displayed on the first portion of the plurality of display segments. A meter controller is configured to determine whether the standard meter display routine should be interrupted or overridden in order to display the remote message.
An utility meter is provided. The meter includes a base and a first barrier operably associated with the base. The base and the first barrier define a first compartment between the base and the first barrier. The meter also includes a heat generating component positioned in the first compartment and operably associated with the base. The meter also includes a second barrier extending from the base. The second barrier and the first barrier define a second compartment between the second barrier and the first barrier. The meter further includes an arrangement for moving heat connected to the heat generating component and extending from the first compartment to the second compartment.
H02B 1/00 - BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER - Details of substations or switching arrangements
H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
A configurable buss element for an electricity meter includes a conductive piece of metal formed into a series of contact connectors and a network of elongate conductors extending between and among the series of contact connectors. Each of the plurality of contact connectors is configured to contact a circuit element of an electricity meter. The network of elongate conductors is operable to provide connectivity between the contact connectors and select portions of the conductive piece of metal in one of a plurality of connectivity configurations, each of the connectivity configurations corresponding to an electricity meter configuration, the select one of the plurality of connectivity configurations defined by a predetermined set of discontinuities introduced in the network of elongate conductors.
An arrangement for use in a utility meter includes a non-volatile memory and an RF transceiver. The non-volatile memory has a first and a second port, the first port configured to obtain commodity consumption data. The radio frequency (RF) transceiver is configured to receive an RF signal from an external source and obtain energy from the RF signal and provide the energy to a bias voltage input of the non-volatile memory. The RF transceiver is further operable to perform a data transfer operation responsive to the received RF signal, the data transfer operation including a transfer of meter-related data between the non-volatile memory and the RF transceiver using the second port of the non-volatile memory.
An arrangement for use in a utility meter includes a first filter stage and a second filter stage. The utility meter has a measurement circuit that includes at least one analog portion susceptible to radio frequency signal interference, the radio frequency signal interference forming an extraneous signal component in an analog signal that is representative of a signal to be measured. The first filter stage is operable to attenuate signals in a first frequency range that is higher than a frequency band of interest of the signal to be measured. The first filter stage is operably coupled to receive the analog signal. The second filter stage is operable to attenuate signals in a second frequency range that is higher than the first frequency range. The second filter stage is also operably coupled to receive the analog signal.
An arrangement for use in a utility meter includes a non-volatile memory and an RF transceiver. The non-volatile memory has a first and a second port, the first port configured to obtain commodity consumption data. The radio frequency (RF) transceiver is configured to receive and RF signal from an external source and obtain energy from the RF signal and provide the energy to a bias voltage input of the non-volatile memory. The RF transceiver is further operable to perform a data transfer operation responsive to the received RF signal, the data transfer operation including a transfer of meter-related data between the non-volatile memory and the RF transceiver using the second port of the non-volatile memory.
A method of assembling a utility meter having a plurality of components on a subassembly is disclosed herein. The method comprises associating an identification code, such as a barcode, with the subassembly and then entering the barcode associated with the subassembly into a first memory. Next, a lot identification code for each of a plurality of components of the subassembly is associated with the barcode of the subassembly in the first memory. The subassembly is then placed in the utility meter having an associated utility meter identification code. The utility meter identification code is then entered in a second memory and the utility meter identification code is associated with the barcode of the subassembly in the second memory. The first and second memory may be searched to determine lot identification codes for each of the plurality of components in the utility meter.
G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
G06K 9/00 - Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
An apparatus for measuring energy consumption includes an input circuit and a processing circuit. The input circuit is operable to generate a first digital signal representative of a line voltage waveform and a second digital signal representative of a line current waveform. The processing circuit is operable to generate energy consumption data based on the first digital signal and the second digital signal. The processing circuit is further operable to generate a first pulse waveform having a plurality of output pulses based on the energy consumption data, each output pulse corresponding to a quantity of energy consumed, the first pulse waveform having a select one of a plurality of modes. The processing circuit is further operable to provide the first pulse waveform to a meter output.
A utility meter implementing the ANSI C12.19 standard is able to bypass security processing using Decade4 security tables for a single data access operation. The meter includes a procedure that is executed by a processor in the meter to process requests for security keys. Data internal to the meter is used to generate a security key. The security key is used by the requesting external device and the procedure to generate an access key. The external device sends its access key to the procedure so it may be compared to the internally generated access key. If both access keys are the same, a data access operation performed by the external device is allowed without reference to the Decade4 security tables. Once a timeout or data access operation is performed, subsequent data access operations are subject to processing in accordance with the Decade4 security tables unless another security key is requested for repetition of the process.
An electricity meter includes an input circuit operable to generate signals representative of a line voltage waveform and a line current waveform. A processing circuit is connected to the input circuit and is operable to generate energy consumption data based on the input signals. A communications circuit is also connected to the processing circuit. The communications circuit includes an optical receiver having a single photo-transistor, a single capacitor and two resistors. The photo-transistor is operable to act as a switching device that allows varying amounts of current to pass in association with received light pulses. This action allows light signals received by the photo-transistor to be converted into electrical signals. The electrical signals are passed across the first resistor. These electrical signals are differentiated by the capacitor and the second resistor to filter out low frequency signals created by ambient light.
A current transformer assembly includes a current transformer and an insulation cup. The current transformer has a core and a first coil in a flux inducing relationship with the core. The core includes an opening defining a void configured to receive at least a second coil. The insulation cup includes a first part and a second part, the first part configured to mechanically couple to the second part such that the first part and the second part substantially encapsulate the current transformer. An interior portion of the insulation cup is disposed between the core and void.
An arrangement includes a liquid crystal display having a length, a width and a thickness. The arrangement further includes an integrally formed housing having a display receptacle, the display receptacle including retention members operable to retain the liquid crystal display in length, width and thickness dimensions. The arrangement also includes a flexible conductor device operably connected between the liquid crystal display and a circuit board.
H02B 1/00 - BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER - Details of substations or switching arrangements
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