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7609051 |
Energy metering system
An energy consumption meter includes a first input for providing a first input signal derived from a voltage, a first analog-to-digital (A/D) converter electrically connected to the first input to...
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7584067 |
Apparatus for measuring average power consumption of computer system
An apparatus for measuring average power consumption of a computer system includes a current to voltage converter for receiving an operating current of the computer system and transforming the...
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7563999 |
Front connected test switch
A test switch is provided having front and rear sides. The test switch includes a base to which a plurality of switch units are mounted. A row of upper terminals are removably mounted to the base,...
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7538570 |
Supply voltage monitoring
An integrated circuit is provided with a distributed supply voltage monitoring system in which a single controller controls a plurality of voltage monitors located in respective modules of the...
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7528595 |
Method for detecting and correcting wiring errors in power monitoring applications
A three-phase monitoring system for detecting and dynamically correcting wiring errors in an electrical circuit. The system includes a voltage divider circuit and a current transformer circuit...
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7502698 |
Power consumption measuring device and power control system
A single-phase, 3-wire watthour meter which can measure power consumption, alter a contract capacity, control the stop/start of power supply/distribution, and easily update programs from a...
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7412338 |
Radio frequency device within an energy sensor system
An energy measurement system including a radio frequency (“RF”) device powered by a solar panel. The RF device comprising a wireless communication port operative to transmit and receive...
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7359809 |
Electricity metering with a current transformer
The data storage and processing resources required for an electric meter are reduced by basing the selection and application of phase error correction on a root mean square load current flowing...
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7302752 |
Method of manufacturing an extended test switch
A method of making and using an extended test switch starting with a previously existing un-extended test switch that is ready for connection to electrical devices to be tested. A housing selected...
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7274305 |
Electrical utility communications and control system
A system for managing collection of data and remote operation of fielded remote units is disclosed. The remote units may be incorporated in automatic meter reading systems, capacitor bank switching...
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7259547 |
System and method to use dynamic feedback of analog to digital converter sample rate to adaptively lock the sample rate to input frequency
A system and method for dynamically lock the sample rate of an analog to digital (ADC) converter to an input frequency. Specifically, a system for measuring power is disclosed. The system includes...
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7079961 |
Method and apparatus for measuring impedance of electrical component under high interference conditions
A test system and method having a test channel and an additional channel, and wherein the ratio of amplitude and phase between the interference current through the device under test and the...
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6940268 |
Apparatus for metering at least one type of electrical power over a predetermined range of service voltages
Methods and apparatus for supplying power for use in metering electrical energy over a wide range of voltages with a single meter are disclosed. The wide ranging meter includes a processing unit...
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6927564 |
Multimeter instrument with touch-sensitive selection device
A multimeter instrument for measuring variables, such as electrical current, voltage, or resistance includes touch-sensitive zones for selection of the variable to be measured. The measurement...
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6828771 |
Electrical power measurement
An electric power meter measures the value of an electrical power parameter, e.g., Universal Apparent Power or Universal Power Factor, of an electrical power signal in the time domain by:...
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6798187 |
Generator status information display for power transfer switch
A power transfer arrangement is provided for supplying power from a generator to the electrical system of a building in the event of a utility power interruption. The power transfer arrangement has...
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6753678 |
Voltage detector with improved accuracy
The present invention is a voltage detector that is capable of measuring AC voltages, especially the high voltages encountered by electric utility linemen, with improved accuracy. To obtain these...
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6617839 |
Method for detecting current transformer saturation
Disclosed is a method for detecting saturation of a current transformer. The method determines whether or not a change of a secondary current generated in a current transformer is due to the...
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6441602 |
Method and apparatus for determining phase locked loop jitter
An exemplary embodiment of the invention is a method for evaluating jitter of a phase locked loop circuit generating a phase locked loop output signal. The method includes generating a test...
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6275021 |
Electricity meter
The invention relates to an electricity meter with signal channels that are passed to a digital signal processing device and each of which has a multiplexer with downstream analog/digital...
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6147484 |
Device for measuring power using switchable impedance
A device for measuring power, or other circuit parameters, of an alternating current load. The device has an ammeter and voltmeter for measuring voltage across the device and current through the...
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6115676 |
Methods and apparatus for performing load profile and load control
An electronic energy meter register which, in one aspect, is configured to perform load profile recording in a manner which eliminates a need for a back-up battery is described. In other aspects,...
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6112158 |
Service type recognition in electrical utility meter
Disclosed is a method and arrangement for use in an electrical utility meter, the electrical utility meter operable to be connected to a plurality of electrical service types. The arrangement is...
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6104182 |
Method of deriving a signal indicating an oscillation in an electric power supply system
Current and voltage space vectors of the positive sequence system are formed from phase current and phase voltage sampling values of an electric power supply system, and power quantities of the...
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6091237 |
Three-phrase clamp-type power meter
A three-phase clamp-type power meter comprises a main body suitable to be held by hand during operation, a clamp assembly to clamp around an external power line to measure the current flowing in...
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6058354 |
Electricity meter to measure electrical physical magnitudes which are parameters or functions of measured voltages and/or currents
An electricity meter contains analog/digital converters to transform input analog voltages and currents into sampled digital values. A first high speed processor derives auxiliary magnitudes from...
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5966010 |
Electrical energy meter with snap fit interlocking parts
An electrical energy meter is provided with snap fit interlocking parts that eliminate the need for screws or fasteners. The current sensor, located within the meter, has a plurality of current...
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5924050 |
Arithmetic unit
First and second 1-bit A/D converters convert respective input voltages being in direct proportion to voltage and current of a measurement system into respective 1 bit codes. First and second...
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5903145 |
Universal electronic energy meter for use with 4-wire standard services
A universal electronic energy meter for measuring electrical energy usage of a circuit having a 4-wire service is disclosed. The universal meter is operable with both 4-wire wye and 4-wire delta...
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5796631 |
Method and apparatus for monitoring and characterizing power quality, faults and other phenomena in network power systems
A method and apparatus for receiving, monitoring and characterizing network power information in real time through the use of a specialized display system. A processor receives three phase current...
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5764523 |
Electronic watt-hour meter
In a method of calculating an electric power by digitalizing a voltage signal and a current signal of an electronic watt-hour meter and multiplying digitalized signals, precision of an electric...
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5737730 |
Measuring process for measuring chargeable electrical consumption from an electrical network and electronic electricity meter
A process for measuring electricity consumption, especially suitable for small consumers, comprises the steps of continuously measuring consumer current, integrating the current with time to obtain...
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5673196 |
Vector electricity meters and associated vector electricity metering methods
Line voltage and line current signals are sensed on a power line having at least one conducting path. The sensed line voltages and line currents are converted into a digital signal. A...
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5642300 |
Precision voltage/current/power source
In the precision source disclosed herein, a reference waveform and a correction waveform are combined and fed to an output amplifier which supplies an output waveform to a load, e.g., a wattmeter...
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5537028 |
Electricity meter and method for measuring apparent power
An electricity meter and method for measuring VA power consumption. The electricity meter comprises a transducer circuit receiving line current and line voltage and producing a first signal...
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5508617 |
Electric power measuring apparatus and method
The current invention is directed to a method of measuring an electric power and in particular to a precise power measurement by measuring a current and a voltage of high-frequency distortion...
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5497077 |
Power calculating device
A power calculating device including a control signal generating unit for generating a control signal. The control signal determines a power calculating period and an imbalance compensation period....
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5475303 |
Electronic watthour meter
A first Hall element is supplied with a current proportional to a load voltage and applied with a magnetic field proportional to a load current and produces a voltage proportional to a load power...
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5450007 |
Method and apparatus for power measuring
A method for generating a product of signals proportional to the voltage of an electrical supply and the current flowing through a load connected thereto, comprises the steps of deriving a first...
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5446374 |
Potentiometer multiplier circuit, and an electrical energy meter including such a circuit
A circuit has two multiplier modules. Each multiplier module has at least one controllable potentiometer for adjusting the amplitude ratio between an output signal and an input signal of the...
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5442279 |
Apparatus and method for detecting power of a three phase alternating current system
An electric power detector for a three-phase AC voltage supply which measures the current of one phase and the voltage between the one phase and another phase and computes the phase difference...
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5406495 |
Substation load distribution monitor system
The monitoring and control system of the present invention provides a distributed intelligence, data acquisition and control system which collects and analyzes large amounts of data representing...
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5336991 |
Apparatus and method for measuring electrical energy and quadergy and for performing line frequency compensation
An apparatus and method for measuring electrical energy and quadergy and for performing line frequency compensation includes a compensation integrated circuit for adjusting the determined reactive...
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5262715 |
Arrangement for the measurement of reactive power or reactive energy
A circuit is disclosed for measuring reactive energy or reactive power. The circuit comprises a main multiplier, a signal/frequency converter, and a frequency divider all connected in series to...
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5229713 |
Method for determining electrical energy consumption
A method of operating a meter to perform the steps of generating a measure of real energy consumed, generating a measure of reactive energy consumed, and generating, from the real energy and...
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5212441 |
Harmonic-adjusted power factor meter
An electric power measuring system wherein power factor measurements are adjusted to reflect the adverse economic effects of harmonic currents and voltages. Well-known techniques are used to...
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5198751 |
Reactive volt-ampere-hour meter
In a reactive volt-ampere-hour meter, either of a pair of electric signals representative of, respectively, an AC voltage and an AC current fed to a load has the phase thereof shifted by 90 degrees...
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5146157 |
Calculation apparatus for an electronic meter
Separate pulse inputs from respective metering circuits, representing the reactive R and in-phase W power components, are converted to a pulse output V representing the vector sum of those...
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5081413 |
Method and apparatus for measuring AC power
A method and apparatus for measuring AC power, in which a measured digital value of an AC voltage is decomposed into two components with a phase difference of 90° therebetween, while a measured...
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5072173 |
Phase detector for mark/space modulated signals
A phase detector includes a pulse amplitude modulator and an integrator. The pulse amplitude modulator comprises a change-over switch the control input of which is fed by pulses which are subjected...
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