Showing papers on "Electricity meter published in 1991"

Power consumption meter for displaying electric power consumed by appliance and the time period of consumption

Abstract: A power meter (10) is provided which can plug into an electric wall socket and it is provided with its own socket (16) for receiving the plug of an electrical appliance. The power meter has means for measuring electric current flow to an electrical appliance and indicates the amount of electrical power consumed by an appliance. In alternative embodiments, the meter is provided as an integral part of an electric wall switch (30) or wall socket (40) or it is built into an electrical appliance (50). In another embodiment, the power meter has a plurality of sockets for receiving the plugs of a number of electrical appliances for separately indicating the power consumption of each appliance.

Testing operation of electric energy meter optics system

Abstract: A method and apparatus for testing the proper operation of the optical elements in the optical detection circuit of an electronic register in an energy meter. The light emitter circuit is periodically pulsed adequately to turn the emitters to the on condition, and a comparison circuit is provided in which the voltage across a monitor point in circuit with the light emitters and a switching circuit is monitored both before and after each pulse. The absence of a voltage change upon pulsing the light emitter circuitry is used to generate a first error or failure signal. The light detector is read prior to each pulse to determine if unprogrammed light is being received prior to the pulsing of the light emitter as an indication of tampering with the accurate reading of the energy meter, and a second error signal is generated in response to unprogrammed light. The first error signal is displayed at the energy meter to the meter reader, while the second error tampering signal is stored and downloaded through an optical link for analysis at the power company.

A wide-band monolithic quasi-optical power meter for millimeter- and submillimeter-wave applications

Abstract: A novel monolithic power meter has been developed for submillimeter-wave applications (100 GHz to 10 THz). The detector is a large-area bismuth bolometer integrated on a 1.2- mu m-thick dielectric membrane. This approach results in a wide-band, high-responsivity detector. The power meter is simple to fabricate, is inexpensive, and can be easily calibrated using a low-frequency network. Quasi-optical measurements at 90, 140, and 240 GHz show that the bolometer is polarization-independent and could be modeled by a simple transmission line model. Absolute power measurements at 90, 140, and 240 GHz show a +or-5% accuracy and agree well with a calibration Anritsu power meter at 90 GHz. Potential application areas are power calibration, antenna coupling efficiency measurements, and absolute power measurements from solid-state devices and far-infrared lasers at submillimeter wavelengths. Absolute output power measurements on a 220-280 GHz tripler using the quasi-optical power meter are presented as an application example. >

Electricity meter tamper monitoring

Abstract: An apparatus and method is disclosed for measuring the consumption of electricity from a mains supply which is either single or multi-phase. The apparatus and method of the invention is also able to detect when tampering with connections to the supply occurs as for instance, may be done in an attempt to reduce the quantity of energy registered as having been used. In a meter which takes as inputs signals indicative of the voltage and currents present in the supply a tamper is registered whenever the voltage reading, for instance in one phase of the three-phase supply, is absent while the corresponding current is present. If both voltage and current are absent this is not registered as tampering but may be noted as a fault in the system.

Method and apparatus for disposing a meter register in a default mode

Abstract: An apparatus for disposing a meter register in a default mode of operation includes a microcontroller coupled to a programmable non-volatile memory for automatically disposing the meter register in a self-programmed state when the electrical meter containing the meter register is installed for the first time. The self-programmed state is a functional default state and provides a monitoring utility company with accurate customer billing information from the time of installation. Accordingly, a technician responsible for installing the meter in the field need not be familiar with the techniques for programming the meter. If a mode of operation other than the default mode of operation is preferred, the microcontroller can be accessed for disposing the meter in a time-of-use and demand mode of operation or a demand only mode of operation. The microcontroller also provides means for retaining a programmed state of the meter register in the event of a power outage. Thus, when power is again supplied to the meter after an outage, the meter register is again disposed in the last programmed state prior to power failure.

A Comparison Between an Absolute Photoacoustic Power Meter and a Brewster Angle Version for Near Millimetre Waves in Free Space

Abstract: The results of a comparison between absolute and non-absolute versions of a photoacoustic power meter for near millimetre waves in free space are presented. The absolute meter has been used to calibrate the non-absolute meter at 60 and 94 GHz. This allows the latter to be used as a secondary standard which can determine power levels of 2 mW with systematic errors of less than 2% and an NEP of 6?W. Hz?. The non-absolute meter is a Brewster angle version of the absolute one, and has the advantage of a responsivity which is a slowly varying function of frequency, unlike the absolute meter which has a resonant structure.

Method for identifying the electrical power-consuming loads in a circuit under surveillance

Abstract: A method is disclosed for identifying the various equipment (loads) on an electric circuit by non-invasive measurements, i.e. not requiring installation of equipment other than a suitable electric meter, for determining the portion of total consumption attributable to each equipment, and for classifying consumption in tabular form for later use. The method involves making appropriate measurements on the electrical supply current for the circuit to determine the variations in impedence of the circuit loads with time, identifying said loads by determining the portion due to an amplitude effect and the portion due to a phase variation, classifying these applied loads in a table, and calculating the consumed power for each type of previously identified and classified load.

Continuous monitoring equipment for variable air floor - controls electrical motor according to air demand signal and computed efficiency

Abstract: An arrangement monitoring a variable air flow contains an evaluation circuit whose input is connected to a pressure measurement cell with a fixed switching point in the air flow, a revolution rate sensor and a ventilator drive power meter. A computer in the evaluation circuit computes the power of the ventilator drive when the pressure cell reaches its switching point. The evaluation circuit receives an air demand signal and drives a revolution rate controller according to the air demand signal and the computed operating efficiency. USE/ADVANTAGE - Continuously monitoring variable air flow produced by ventilator driven by electrical motor controlled by revolution rate controller. Simple arrangement enables measurement of throughput in partial load range.

Electric energy metering on-line detector for clamp mutual-inductor

Abstract: The utility model relates to an electric energy metering on-line detector. At present, the way that a metering device is used for seeking large error by an electrical power system generally is that the metering device for users needs to be torn down after power cut and the metering device is checked on a special checking table. The way wastes human power and material resources, and results in economic loss after power cut. The electric energy metering on-line detector can detect the error of the metering device in an on-line mode. The utility model is composed of an open clamp mutual inductor and a matched electrical meter. The open clamp mutual inductor is composed of a mutual inductor coil, a moving iron core and an insulated handle. The lateral face is provided with a movable breach which is in a handhold type. After tried out for many times, the utility model which is a novel detecting tool for the electrical power system has the advantages of rapid and accurate measuring, convenient carrying and obvious superiority.

Error compensation device for an induction type electricity meter.

Abstract: The voltage electromagnets (2, 3, 4) of an induction-type electricity meter are provided with auxiliary windings (6, 7, 8) which, with an associated load resistor (10, 19) form a compensation circuit. The compensation current (IK) flowing therein can be set by a control unit (12) as a function of the error curve (1) of the electricity meter (5) such that the error (F) which is dependent on the load current (I) is compensated for.

Error compensating circuitry for electronic electricity meter - has ohmic resistor and capacitor in series between common pole of changeover switch and phase lead of mains

Abstract: The electronic switch of the time-division-multiplier used in the electricity meter is in the form of a change-over switch (7) in order to halve the offset voltage of the integrator (8) and eliminate the errors arising from the voltage-dependent resistors of the switching elements. The working contact of the switch (7) couples the electrical mains values to be modulated with the inverting input of the operational amplifier (10) of the integrator. The lazy contact couples the electrical values to appts. earth. An ohmic resistor (5) and capacitor (6) are connected between the change-over switch pole and the phase lead (L) of the mains. The value of the resistor is large compared with the a.c. impedance of the capacitor at mains frequency. USE/ADVANTAGE - Domestic meter. Sufficient compensation for measuring errors arising from various causes.

Electricity meter with tariff switching for the continuous acquisition and display of the amount of mains power, averaged over constant time intervals, used by a consumer

Abstract: In an electricity meter with tariff switching for the continuous acquisition and display of the amount of mains power, averaged over constant time intervals, used by a consumer, the time intervals (measuring periods) continuing at the time clock frequency fZ in time with an n-hour time frame, in which a pulse transmitter (6) whose pulses per time unit are a measure of the measured electrical power and, multiplied by the time, a measure of the electrical energy consumed, controls a microcomputer which converts the pulses into work/power values and supplies the latter on demand to an LCD indicator (3) and initiates control functions, and continues the measuring periods in time with the time frame. According to the invention, the time clock frequency fZ of the time clock transmitter of the microcomputer (2) is to be multiplied by a factor (x) during the time period of the electricity meter, by means of a test button (20) which can be operated by hand.

Anti-three protective metering switch box

Abstract: The utility model relates to an anti-three protective metering distributing box, which comprises a meter, such as an electrical meter, etc., an air switch which is arranged behind the meter, a box body, an error preventing connector which is arranged in front of the meter, an air switch which is connected with the back part of the meter. An electricity leakage protector which is used for controlling the air switch is arranged behind the air switch. The outlet terminal of the firing line of the electricity leakage protector and an over-voltage automatic protector are connected in parallel. The box body is provided with an edge skirt, a box cover is provided with a meter display hole and an air switch handle hole, and the edge skirt and the box cover are provided with a box locking hole. The utility model has the functions of error preventing connecting wire metering by electrical work, electricity leakage prevention, electricity theft protection and over-voltage automatic protection, and can preferably protect electrical equipment and ensure personal safety.

Phase-interruption time-meter for three-phase electric meter

Abstract: The utility model relates to a lacking phase timekeeping instrument for a three-phase watt-hour meter, which is a monitoring instrument for judging the correctness of the electricity measurement of the three-phase watt-hour meter. The utility model is composed of a lacking phase detector, a clock circuit, a time pulse control circuit, a lacking phase timer and a working power supply, wherein, the lacking phase monitor is composed of an NOT-AND gate circuit and an OR gate circuit. The circuit of the utility model is simple, and the adjustment of the circuit is convenient. The utility model can be widely used for an electric service department, and under the condition of lacking phase measurement, the utility model can monitor lacking phase time so as to ensure the accurate electricity measurement.

Load acting method for power system ,and electric meter, indicating device, and switching deviceusedin that method

Abstract: PURPOSE: To make uniform a power taken out of the line of a power system to which signals are applied by using a ripple control system to operate the load of the power system, by a method wherein the intervals between the signals are changed. CONSTITUTION: Consumers' wattmeters are made to be perfect by a computer which indicates not only a power taken out of a power supply line, but also a consumption which is weighted in accordance with the respective intervals between signals. This operation is performed by adding an average power which is taken out of the line by the consumer (home or company) in the final interval, always when a ripple signal applied to the power supply line is identified. The operation is performed with a higher frequency in the maximum load state than in the non-maximum load state.

Improved power meter

Abstract: not available for EP0688433Abstract of corresponding document: GB2276012An apparatus for measuring electrical power is adapted to produce an output signal proportional to the product of a supply voltage and current flowing through a connected load. A first signal proportional to the supply voltage and a second signal proportional to the load current are used to modulate at 5 and 4 respectively the period of two constant frequency carrier signals. Third and fourth signals derived from the modulated signals are transmitted to a microprocessor 8, for example via electrical isolating devices 7 and 6. The processing of the third and fourth signals may include counters and generation of a constant frequency clock signal. The signals can be averaged over a period of time to provide automatic zero power calibration.

Sensor for detecting the rotation of a disc of a meter

Abstract: The invention relates to a sensor intended to detect the rotation of a disc. … It relates to a sensor which comprises, in a body, a light source (22) intended to illuminate the segment of a disc (8) placed in a slot (15) of the body, so that the light reaches a light detector (27). A dark sign is placed on the reflecting edge of the wheel (8), so that the photodetector (27) forms pulses which can be counted. Preferably, the body contains at least two light sources and optionally two photodetectors. … Application to remotely reading electric meters. … …

Quick response, high accuracy standard optical power meter

Abstract: A standard optical power meter has been developed that can be used to measure light from optical fibers as well as light beams The optical detector element in this power meter consists of NiP optical absorption material, which has an ultralow reflectance and high reliability, and a mu c-Ge:H film with excellent thermoelectric conversion efficiency characteristics This standard optical power meter has a response time of 18 seconds, which is 1/3 the response time of conventional thermal detector elements, and a high accuracy of +or-15% or better when measuring in the -15 dBm to +10 dBm level range at wavelengths of 04 mu m to 18 mu m >

Automatic numeral type electric metering on-line detecting instrument

Abstract: In general, when metering devices with large searching errors are used in the electric power system, power is cut off, and meters and mutual inductors of users are disassembled and tested on special checking tables, and therefore, human power and material resources are wasted, and economic loss can be caused by power failure. The utility model provides an automatic numeral type electric metering on-line detecting instrument which can detect the errors of metering devices of users in an on-line mode without power failure. The utility model is composed of a pliers type current mutual inductor, a detection electrical meter, a photoelectric sensor of a detection meter, a photoelectric sensor of a measured meter, a computing display and a cabinet. The utility model can be used for measuring with a mutual inductor uniformly. The utility model which can be carried by one person can detect rapidly and accurately and can detect errors in several minutes. The utility model is a novel detecting tool for electric utility departments.

Power supply for electricity meter components

Abstract: The components of an electricity meter are supplied via an iron core with an E shape and central branch ending with a pole (4). The central branch supports a coil (5) and a supplementary winding (7) that is accommodated in a recess of the E piece body (2). The winding is made of a backlack wire. The magnetic circuit of the E piece is closed by a U-shaped pole (6) inserted in another recess of its body.

Electricity fraudulent use preventing device

Abstract: The utility model relates to an electricity theft preventing device used with a civil electrical meter in a matching mode, which is composed of a current mutual inductor, a Wheatstone resistance bridge, a switch pipe, a relay, etc. The balance of the output of the resistance bridge is controlled by utilizing the current voltage of the current mutual inductor to cut off or conduct the switch pipe, and thus, the relay is triggered to be cut off and closed. Thereby, electricity behaviors can be prevented from occurring.

Electronic type energy meter of module structure

Abstract: PURPOSE: To make it possible to increase the flexibility for many applications by removably connecting a base module, voltage module, meter register assembly module. CONSTITUTION: A base module 14 (or current module) circuit-connects a meter 10 to a power source and load to be measured via a terminal 22, and has specific current sensors 40, 42, 44 and rating for obtaining desired meter class. A voltage module 112 has a lateral support member 96 and one or more transformers mounted to supply different voltage ratings and power to an electronic circuit. A register module 60 supplied with standard signal normalized from the modules 14, 112 is used for arbitrary combination of the modules 14, 112. The selected modules 14, 112, 60 are removably connected to each other by flexible electric conductor, connector, mechanical spacer and support means.

Arrangement of electric meter for avoiding or indicating fraudulent use of electricity

Abstract: The utility model belongs to a power supply monitor which is an electricity fraudulent use prevention device for an ammeter. The utility model is composed of two current transformators with identical electrical parameters, an electronic amplifier, a relay and a controlled silicon. The utility model is characterized in that primary coils of the two current transformators are in in-phase concatenation and are in concatenation with a current coil of the ammeter to connect into a fire wire, and secondary coils of the two current transformators are in opposite phase concatenation with the input end of the electronic amplifier. The utility model can effectively monitor and stop the action of electricity fraudulent use, such as ammeter disconnection, zero curve disassembly, inclination, monitoring signal line damage, partial load damage, etc.

Anti-power-theft watt-hour meter

Abstract: The utility model discloses an anti-power-theft watt-hour meter, belonging to the field of electric meters. An indication meter head and four wiring terminals are enclosed in the same one housing, wherein, two wiring terminals are connected with inlet wires of certain lengths with tougher outer insulating layers, the other two wiring terminals are connected with loading wires, and the inlet wires and the loading wires are led out from four wire led-out holes on the bottom of the housing. The anti-power-theft watt-hour meter can effectively prevent power-theft operations by users.

Electromagnetic Nd-Fe-B electric meter

Abstract: The present invention relates to a kind of magnetoelectric type Nd-Fe-B electric meter used in instruments meters and universal meters. Basing on the original magnetoelectric meters, it uses processed Nd-Fe-B as permanent magnet. The advantages are high flux density of working gap, low cost, stable magnetism, capable of miniaturizing structure and developing meters with high sensitivity and low internal resistance. The invented structure is also suitable to other magnetoelectric meters.