|
Match
|
Document |
Document Title |
|
|
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...
|
|
|
5053697 |
Input circuit for an electrical energy meter
The invention relates to an input circuit for an electrical energy meter, which circuit has a current path and a voltage path, the current path being associated with a mutual conductance...
|
|
|
5017860 |
Electronic meter digital phase compensation
An electronic watthour meter for metering the consumption of electrical energy on power lines includes phase compensation means for compensating for leading and lagging phase differences between...
|
|
|
4980634 |
Electric power measuring system
An electric power measuring system wherein the current and voltage components are converted to respective digital signals which are multiplied and integrated to obtain a measurement of total power...
|
|
|
4937520 |
Instrument to measure the errors of apparent power meters
An instrument to determine, under actual field conditions, which type of VA demand meters are most appropriate for a particular consumer. The type of electrical load that the consumer places on an...
|
|
|
4920312 |
Multiplier
A multiplier having pulse width modulators for modulating input signals into pulse signals whose pulse widths are corresponding to the levels of the input signals and which are asynchronous to each...
|
|
|
4884021 |
Digital power metering
Method and apparatus for metering polyphase power sources in which cycles for each phase are sampled at each degree and converted to a binary representation of amplitude. Sampling commences with a...
|
|
|
4878026 |
Measuring circuit of the DC component of the current flowing through the primary winding of the output transformer of an inverter
The measuring circuit comprises an integrator to which a signal representative of the current flowing through the primary winding of the output transformer of an inverter is applied. The integrator...
|
|
|
4814696 |
Method and circuit arrangement for measuring in-phase and quadrature components of current in an electrical alternating current power supply
A method and circuit arrangement for measuring in-phase current and quadrature current in an electrical alternating current power supply is disclosed. The invention uses a microprocessor whereby...
|
|
|
4801874 |
Method and apparatus for measuring electricity
The method and apparatus disclosed relates to the electronic measurement of the electricity used by a load. The apparatus generates a rectified voltage signal proportional to the load voltage. A...
|
|
|
4794369 |
Multi-function electricity metering transducer
An electricity metering transducer is disclosed which samples voltages and currents at an innerconnection terminal of an electrical energy distribution system, converts those samples to digital...
|
|
|
4794327 |
Electrical parameter sensing module for mounting on and removal from an energized high voltage power conductor
A toroidal sensor module having a metallic outer skin and mounting means for installation upon and removal from an energized power conductor providing synchronized measurements of electrical...
|
|
|
4782287 |
Watt-hour meter
In a watt-hour meter pulse width modulated signals, representing the voltage supplied to a load, serve as chopping signals that modulates a waveform representing current to produce an output...
|
|
|
4733171 |
Differential switched-capacitor dual slope watthour meter circuit
Transient offset error voltages due to charge injection by MOS analog switches and DC offsets of multipliers in switched-capacitor integrators of electronic metering circuits are compensated by the...
|
|
|
4663587 |
Electronic circuit for measuring electrical energy
A shift register is utilized to provide a 90° delay in a pulse width modulated current signal to determine volt-amperes reactive. The shift register is associated with a clock that provides a...
|
|
|
4620157 |
Reactive power to DC signal converter
The output from a capacitor, which shifts a voltage output by π/2, and a detected frequency output, are multiplied by a pulse width modulation circuit, and a current input is switched by the...
|
|
|
4615009 |
Electronic energy and power monitoring apparatus
An assembly for monitoring or metering a plurality of electrical energy and power parameters wherein six current and six voltage stepped down transformers are associated with a drawout cradle in...
|
|
|
4594547 |
Mark-space amplitude modulator for measuring reactive power consumption or reactive energy consumption
An apparatus for determining the reactive energy of a circuit includes a mark-space modulator, which has an input terminal normally accepting a first signal input, and an output terminal, a pulse...
|
|
|
4556843 |
Electronic solid state Q-hour meter and/or combination Q-hour and kilowatt-hour meter
An electronic solid state Q-hour meter for measuring leading and lagging VARS quantities of electric power over a defined range of power factor. The Q-hour meter comprises first and second time...
|
|
|
4454471 |
Electronic arrangement for determination of reactive power
An electronic arrangement for determination of reactive power, including two transducers delivering at their outputs measuring voltages proportional to supply current and supply voltage. An...
|
|
|
4365251 |
Electrically driven meter totalizing device
A register is coupled to a rotor which is driven in stepped rotation by magnetic fluxes directed through electromagnetic pole pieces of a stator. The pole pieces carry coil windings which produce...
|
|
|
4301408 |
Electrical measuring apparatus employing magneto-electric devices
An electrical measuring apparatus comprising a current domain magnetometer (C.D.M.) (1) and summation means (2) for summing the output pulses from the C.D.M., the sum of the summation means...
|
|
|
4300182 |
Metering and protection system for an A.C. power system
A system for electronically metering an A.C. electrical power system to derive performance parameters such as real and reactive power useful in revenue metering and fault protection applications....
|
|
|
4275349 |
Watt and var transducer
A watt and var transducer which alternately generates each function in response to commonly shared time division multiplication circuitry, and which provides a continuous indication of watt and...
|
|
|
4257004 |
Electrical energy measuring multimeter
An electrical energy measuring multimeter for measuring electrical energy consumption is disclosed. The multimeter utilizes a first input signal that is proportional to the time derivative of a...
|
|
|
4131847 |
Device for measuring active and/or reactive component of AC current or AC power
A device for measuring the active component and reactive component of AC current or AC power comprising a first detector detecting AC voltage of an AC circuit, a second detector detecting AC...
|
|
|
4104580 |
Storage battery test apparatus to determine remaining stored charge therein
A volt meter is connected across the battery terminals to read output voltage; a standard load, which may be the normally connected or design load for the storage battery is connected thereacross...
|
|
|
4066959 |
Electronic volt-square-hour metering method and apparatus
An electronic meter for measuring V 2 hr in an electrical system includes a center tapped transformer for deriving two analog signals proportional to a detected voltage in the system with the...
|
|
|
T955007 |
Method and apparatus for metering apparent energy
Metering kVA and kVAh in an electrical system is accomplished by generating pairs of analog signals representing current and voltage variables. Each of the analog signals is synchronously rectified...
|
|
|
3934198 |
Multi-wire electronic kWh meter
The metering of kilowatt hours in a single phase, three wire electrical system is accomplished by generating a first analog voltage which is representative of the voltage of the power consuming...
|
|
|
3869661 |
Stimulating device having a controlled power
Permits applying to a variable load, such as a living body, electric signals of defined power. It comprises a generator of a reference pulse, an analogue multiplier adapted to multiply the voltage...
|
|
|
3868059 |
Magnetic bridge-type meter for magnetically permeable particulate matter
Apparatus for quantitatively analyzing the content of magnetically permeable material in a fluid stream with the use of a magnetic bridge circuit which becomes unbalanced in response to the flow of...
|
|
|
3805157 |
AMP-HOUR METER
A submersible having a bank of storage batteries for power is provided with circuit giving crewmen a real-time indication of power used or power remaining in the batteries. A sensor element...
|
|
|
3764907 |
ELECTRONIC DIRECT-CURRENT WATTHOUR METER
An electronic direct-current watthour meter for measuring the energy transmitted by a direct-current system is disclosed. The power transmitted by the system at a given instant is equal to the...
|
|
|
3723872 |
THREE-WIRE, THREE-PHASE WATT-VARMETER
A power measuring circuit. A circuit for measuring three-phase real or reactive power utilizing two wattmeter circuits without employing additional phase shifting networks. The current input of...
|
|
|
3546441 |
LOCOMOTIVE ENGINE PERFORMANCE SYSTEM INCLUDING THE MULTIPLICATION OF ANALOG AND DIGITAL SIGNALS
|
|
|
3523248 |
POWER FACTOR MEASURING DEVICE RESPONSIVE TO THE RATIO OF VARHOUR PULSES TO WATT-HOUR PULSES
|
|
|
3505506 |
KVAH COMPUTER FOR OBTAINING THE SQUARE ROOT OF THE SUM OF TWO QUANTITIES
|
|
|
3505505 |
VOLT-AMPERE DEVICE
|
|
|
3505507 |
POWER-FACTOR MEASURING DEVICE
|
|
|
3470470 |
MULTIPLE-TRACK MAGNETIC PULSE RECORDING OF RELATED QUANTITIES
|
|
|
3458810 |
REMOTE GROUP METERING OF ELECTRIC ENERGY FOR MULTISTORY BUILDINGS WITH CURRENT TRANSFORMER
|
|
|
3457506 |
PHASE INDEPENDENT INDUCTION TYPE METER FOR MEASURING VOLT-AMPERES
|
|
|
3312865 |
Static reactance relay
|
|
|
3286178 |
Means for measuring active and reactive power in a 3-phi, 4-w distribution system, including three autotransformers interconnected to provide 2-phi to 3-phi conversion
|
|
|
3271652 |
Supervisory battery charger responsive to the number of charge-discharge cycles
|
|
|
3155903 |
Polyphase measuring device using a single eddy current type measuring unit and a three-winding mutual reactor
|
|
|
3024416 |
Varhour meter
|
|
|
2996671 |
Watt meter system
|
|
|
2875408 |
Volt-ampere measuring instrument
|