Showing papers on "Electricity meter published in 1988"

Application of a three phase nonsinusoidal calibration system for testing energy and demand meters under simulated field conditions

Abstract: The influence of harmonics on commonly used three-phase watthour and kVA demand meters was studied using a computer-controlled three-phase test system capable of generating nonsinusoidal voltages and currents. A description of the three-phase test system and results of preliminary tests of several revenue meters are presented. The performance of the tested meters is compared with the response of time-division and thermal reference meters for different harmonic conditions, primarily field-recorded data. Errors up to 2% were observed during the testing of energy meters and up to 35% for kVA demand meters. >

System for use with polyphase utility meters for recording time of energy use

Abstract: A system for use with polyphase electric meters having a rotatable disc for recording time of energy use. The system includes a cover, a sensor means, a first module, and a second module. The sensor means detects rotation of the meter disc. The first module is disposed within the confines of the meter cover and includes means for providing power for operation of the system. The second module is releasably mounted to the cover such that disassembly may be accomplished without the use of tools. The second module includes circuit means for determining time of energy use information and storing the same, and for optically transmitting that information to a location external of the meter.

Low-powered remote sensor

Abstract: A low-powered remote sensor is achieved by capacitively isolating a long duration perpetual timer which is powered by removing inductively coupled AC power from telephone lines or other long lines. Three embodiments are described using this concept. The first embodiment is a remote utility sensor designed to periodically dial and transmit data to a central site via telephone lines and report its functionality on a periodic basis. The second embodiment of the remote utility sensor is used for reporting utility usage for common utilities such as gas meters, water meters, electric meters and water softeners on a periodic basis over telephone lines. The third embodiment is a remote utility sensor which continually records utility usage and can be read by a portable recording device through a remote cabled interface.

Circuit arrangement comprising multiplier circuits to find the sum of electrical power outputs for application in multi-phase electricity meters

Abstract: A circuit arrangement for finding a sum of electrical power outputs for use in a multi-phase electricity meter is disclosed. The circuit arrangement comprises a plurality of multiplier circuits arranged in sequence. The sequence of multiplier circuits has two poles which form the output poles of the circuit arrangement. Each multiplier circuit comprises a Hall element, an amplifier, and a polarity reversing switch.

Integrated poly-phase power meter

Abstract: A high accuracy power meter capable of mea­suring power supplied or consumed in multiple phases of a distribution system is fabricated as an integrated circuit. Voltage and current sensing transducers coupled to the power meter provide input signals having a potential proportional to the voltage and current in the distribution system. A low charge injection pulse width amplitude multiplier using a digitally-synthesized triangular wave is provided for each phase. Each multiplier receives the input signals and provides an output signal having a current proportional to the product of voltage and current in that phase of the distribution system. Charge from the multiplier output currents for all phases is accumulated in a capacitor connected across an autozeroing amplifier, which corrects for its own offset voltage. The amplifier output controls a switch connected between a reference potential and the capacitor. When the switch is closed a reference current is supplied to the accumulating capacitor to balance the charge from the multiplier for each phase. The frequency of the switch control signal provides a highly accurate measure of the power consumed or supplied by the distribution system.

Meter reading device

Abstract: A utility meter incorporates means to provide information identifying the meter, 1, and information indicative of the meter reading. A device to be utilised in reading the meter comprises a memory 8 and means to transfer, to the memory, the information provided by the meter. The memory is provided with means to enable information to be transferred directly to a computer. The information may be passed from the meter to the device by radio, ultrasonic, or optical transmission. An electricity meter has a modem 15 connected with a transmitter 2 and a receiver 3 and with a ring main supplied through the meter. The meter reading device 5 has a modem 16 connected through a plug and socket 18, 19 with the ring main for transmitting and receiving signals between the meter and meter reading device. A suppressor 13 prevents data signals passing back through the mains supply. Data are downloaded to a computer from an output port 11 of the device memory.

An enhanced power meter for SPICE2 circuit simulation

Abstract: An enhancement to a technique presented by S.M. Kang (IEE J. Solid-State Circuits, vol.SC-21, p.889-91, Oct. 1986) for measuring average power dissipation during a SPICE circuit simulation is described. A modified power meter circuit is discussed that allows power measurement during an arbitrary interval of time, holds a constant final value at the end of the sampling interval, and improves the resolution of the technique. Simulation results comparing the modified power meter with the original power meter are presented to verify the modification. An optional modification to provide for a variable power supply voltage is also included. >

Voltage testing device attachable to the blade terminals of a power meter

Abstract: A voltage monitoring device is adapted to fit within or be mounted externally of the housing of a standard electricity meter. The device repeatedly monitors the voltage of the mains supply, stores data derived from the measurements for consecutive predetermined periods, and releases the stored data upon request.

Remote read-out system for consumption meter (electricity meter, supply meter)

Abstract: In order to read out consumption meters (10) which are installed in inaccessible places, for example behind a cellar wall (50), a read-out head (30) is mounted in a place which is easily accessible. The read-out head (30) and the consumption meter (10) are connected via a wire line (20). A mobile scanning device (40) transmits energy and information via a primary coil (41) with pot core (45) to a secondary coil (31) with pot core (35) in the read-out head. The feedback from the read-out head (30) to the scanning device (40) is carried out via a light-emitting diode (34') to a phototransistor (44'). The wire connection (20) is constructed in the form of a two-wire current loop, the secondary coil (31) and the light-emitting diode (34') being connected in series in the current loop.

Shield for electric meter puller

Abstract: An emergency meter pulling shield protects emergency response personnel from inductive flashback and explosion while pulling electric meters and feeding active circuits. A cylindrical shield sized to completely enclose the meter contains an internal tension band which may be tightened around the shield of the meter and a protected handhold for pulling the meter, enclosed within the shield, free of its socket. Any flashback and explosion is contained within the shield and the personnel pulling the meter are protected.

Power supply for radio-frequency excited gas laser

Abstract: The power supply includes an oscillator (20) which generates a radio-frequency signal amplified by an amplifier (21). The amplified signal is applied to a laser (22) to initiate and maintain a discharge in the laser gaseous active medium. Power control means (24) are provided operable after initiation of the discharge to adjust the power applied to the laser to the value required to operate the laser at maximum efficiency. Automatic gain control means (25) may be provided, responding to the output from a power meter (23).

Calibrated optical fiber power meters: Errors due to variations in connectors

Abstract: We discuss potential errors in the measurement of optical fiber power when using a calibrated power meter with connectors of various types and from different vendors. Data are given on the error and standard deviation due to biconic connectors from a limited number of vendors. We speculate that the error is due to reflecting surfaces on the connector end. To confirm the hypothesis, we tested two connectors whose reflective ends have noticeable differences. The data illustrate the variability seen among connectors. Our data indicate that a user should expect measurement error in most cases. We issue a call for caution based on the results.

Plug socket with power monitor

Abstract: PURPOSE: To attain miniaturization and to make it possible to know a current, a power, a rate, etc. for each plug socket, by using a power meter wherein a magnetoresistance element is employed. CONSTITUTION: Diagonal vertexes 8a, 8b of one pair of the vertexes in a group 8 of magneto-resistance elements are connected in parallel to a power supply source 5 and a voltage of the supply source 5 is impressed on the diagonal vertexes 8a, 8b. When a load current flows through a magnetic field generating means 7 and 8 and a magnetic field is impressed on 8-1 and 8-2 out of the elements 8-1W8-4, resistance values thereof are varied. Therefore the balance of a bridge breaks and an output corresponding to the voltage of the supply source 5 is generated at a terminal 9. Variations in the resistance values of the elements 8-1W8-4 are proportional to a current flowing through a load 6, and the balance of the bridge connection breaks due to the variations, causing a variation in the voltage. Therefore the output of the terminal 9 is in proportion to the product of the current flowing through the load 6 and of a voltage at the opposite ends thereof, and thus a load power can be measured. COPYRIGHT: (C)1989,JPO&Japio

Electronic electricity meter.

Abstract: The electricity meter with offset voltage compensation device operates with a multiplier in accordance with the time-division method. In this method, each modulator (1-3) is controlled by a common triangular-wave generator (4) in such a manner that, independently of the detected power, no input switch (5-7) is closed during a time interval DELTA t in each period of the triangular-wave generator. During each time interval DELTA t, a compensation capacitor (10) is connected via switches (11, 12) to the input of the operational amplifier (8a) of the integrator (8) in such a manner that it is charged up to its offset voltage Uoff. During the subsequent phase, the compensation capacitor (10) is connected between the non-inverting input of the operational amplifier (8a) and reference potential in such a manner that the offset voltage Uoff of this operational amplifier (8a) is compensated.

Additional mounting for an electricity meter

Abstract: of EP01569811. An auxiliary device for an electricity meter, where the housing of the auxiliary device consists of a least two parts, a base (1) and an upper part (2), plug-and-socket connections being provided between the electricity meter and elements of the auxiliary device, characterized in that the base (1) is provided with a connecting strip (1f) which electrically connects the auxiliary device to the electricity meter (3) and, where appropriate, to other devices, and with a socket strip (1g) electrically connected thereto ; and that the upper part (2) contains all the assemblies of the auxiliary device and a plug strip (4a) for connecting these assemblies to the electricity meter (3) and which is inserted into the socket strip (1g) when the upper part (2) is placed in position.

Meter with two tarif counters for the separate calculation of the current usage of two user groups

Abstract: of EP0315834The arrangement according to the invention is intended for separately sensing the power consumption of both user groups in systems in which the second user group (4) is only operated during a first tariff phase, and it is to be made possible to check the two two-tariff meters with respect to one another. This object is achieved by the fact that the first user group (3) is connected via the series circuit of both two-tariff meters (1, 2) and the second user group (4) is only connected via one two-tariff meter (1) to the electricity supply network and that a functional check of the two two-tariff meters is carried out by comparing the counts of the two two-tariff meters and the power consumption of the two user groups (3, 4) is separately sensed by adding or, respectively, subtracting the counts. The arrangement is particularly suitable when a Ferraris meter is combined with an electronic electricity meter.

Laser power meter with an integral alignment module

Abstract: A reliable, fast‐beam alignment method for a thermal‐type laser‐power meter is proposed. The thermopile‐type power meter that has been developed and manufactured consists of a main‐sensor and a pinhole on the target, and a fast‐response sub‐sensor behind it. The alignment can quickly be performed by monitoring the beam‐power density of the incident‐laser beam. The method has been found to be very effective for beam alignment.

Fully automatic ac stabilizer

Abstract: The utility model relates to a contactless stepped voltage regulation type fully automatic AC stabilizer using a bidirectional thyristor as a multiple tapping point auto-transformer shifting element. When the fully automatic AC stabilizer is turned on, no abnormal high voltage is output, when the shifting is done, no pulse high voltage or momentary power failure phenomenon generates, and a refrigerator protection device is accompanied. The utility model has the advantages of small size, light weight, low cost, no noise and small waveform distortion, and the control circuit of the fully automatic AC stabilizer is entirely composed of integrated circuits to make the circuit simple, reliable and with stable performance. The utility model is especially suitable for installation beside the electrical meter in the inhabitant's house to stabilize the voltage to the entire home-use main power line.

Apparatus for the demonstration of the characteristics of a.c. circuits

Abstract: The utility model discloses a device for the demonstration of the characteristics of AC circuits, which is a teaching instrument. The instrument is provided with an ultra-low frequency signal generator which can generate signals and a larger inductor which is matched with the ultra-low frequency signal generator, wherein, the frequency of the signal is very low and the signal is continuously variable (0-3Hz). The ultra-low frequency signal generator transmits direct current through a wirewound resistor with constant resistance value and samples the direct current on the resistor with a rotation electricity brush in a cycle way, obtaining the AC signal. An inductance coil adopts an iron core in a reasonable shape and proper circle numbers and obtains ideal inductance quantity. The device for the demonstration of the characteristics of AC circuits solves the problem that the past instrument can not complete the experiment that the phase difference of the voltage and the current of a pure capacitance, a pure inductance and a pure resistor in the AC circuits can be directly displayed by a large demonstration electricity meter.

Induction electricity meter

Abstract: The utility model relates to an induced testing current alarm instrument, which is composed of a shell inducted pole (1) in cylinder shape, an amplifying circuit (2), a comparison circuit (3), a demodulation amplifying circuit (4) and an alarm circuit (5). The structure of a compressible inducted pole is used for adjusting induction sensitivity, so that the purposes of non-contact testing current alarm and orienting test can be realized. The utility model can also be used for the alarm hint of safe distance in the working environment of high voltage, for the judgement of the electrification status of a lead wire, for the distinction between a zero line and a fire line and for the search of the position of a broken wire.

Arrangement for an electricity meter with audio-frequency ripple control receiver integrated in the meter housing

Abstract: For electricity meters with an audio-frequency ripple control receiver which is integrated in the meter housing and which influences switching means for switching over the tariff devices, it is proposed to design the switching means to be electrically drivable by means of additional control inputs. As an alternative, the drive can be effected via free terminals of the meter, via optical devices or by means of a keyboard or a switching lever arrangement.

Optical fibre transmission power meter having self-calibration function

Abstract: A power meter for measuring transmission power in optical fibres has been developed. A thermistor element is used for the power sensor, and can be calibrated by a calorimetric technique. It is available for power levels of 1 μW˜10 mW at wavelengths of 400–1600nm with an accuracy of 2.5˜0.5%.

Power meter for laser thermal angioplasty

Abstract: We have developed a simple power meter for measuring the power delivered to the tissues when performing thermal angioplasty.

Electric energy measuring device

Abstract: The utility model relates to a peak-valley electric energy measuring device, which is composed of a voltage measurement loop, a current measurement loop, and a time program controller. The peak-valley electric energy measuring device can read the number of power utilization at the peak and the valley time intervals at definite time from a peak electrical meter and a valley electrical meter, and the utility model is suitable for electric networks to measure electric energy of industrial users, agricultural users, etc.

Electricity-saving safety type kilowatt-hour meter

Abstract: The utility model relates to an electricity-saving safety type kilowatt-hour meter which is composed of a common electric meter cassette mechanism, an electricity-saving circuit and a safety circuit and is arranged inside a casing; the electricity-saving circuit is not provided with a contact, and the volume of the electricity-saving circuit is small; the electricity-saving circuit hardly consumes power without a load, while a common kilowatt-hour meter consumes electricity about one kilowatt-hour without a load; the safety circuit is composed of a voltage reduction voltage stabilizing circuit, a switch circuit and an acousto-optic alarm circuit; the safety circuit can quickly cut off the electric source when accidents of electric shock and electrical leakage occur and can send out an acousto-optic alarm signal. Through the improvement of the common kilowatt-hour meter, the utility model has the advantages of convenient implementation and versatility.

Pulse kilowatt-hour meter

Abstract: The utility model relates to a pulse Kilowatt-hour meter remolded from a common electrical meter, which belongs to an electrical energy (electrical degree) remote transmitting technique. The utility model is used for measuring electricity quantity in an automatic meter reading system. The pulse Kilowatt-hour meter is provides with two probes and a bistable circuit, and thus, the multiple pulses caused by the judder of a rotating shaft of an aluminum disc of the electrical meter are prevented, and the missing pulses caused by the rotation at slow speed of the rotating shaft of the aluminum disc are prevented. Each probe is respectively composed of three inductors, wherein, the two inductors are formed in methods that enamelled wires are wound on I-shaped magnetic cores, and the other inductor is formed in a method that an enamelled wire is wound on the other I-shaped magnetic core.

Electric meter box with plug-in fuses

Abstract: The utility model relates to an electric meter box with plug-in fuses, which belongs to an auxiliary device of electric supply. The utility model is composed of a box body, a box door, base board plug-in fuses, an automatic protector for electrical leakage, a zero terminal and an electrical meter. The utility model has the advantages of strong safety performance, high reliability and long service life.

Electricity-limiting theft-proof protective device

Abstract: The utility model relates to an electricity-limiting theft-proof protective device which is the electricity-limiting theft-proof protective device used in front of an electric meter The electricity-limiting theft-proof protective device comprises a theft voltage signal detector, an electric shock current signal detector and a current overload signal detector; the theft voltage signal detector is composed of a shielded wire whose one end is connected with an electrical meter and the other end is connected with a relay, a zero sequence mutual inductor B-[2], a resistance and an electronic switch; the electric shock current signal detector is composed of the zero sequence mutual inductor B-[2]; the current overload signal detector is composed of a current mutual inductor B-[1], an adjustable potentiometer, a diode, a capacitance and a voltage stabilizing diode The electricity-limiting theft-proof protective device can be directly connected with the line-in end of the users and can effectively prevent various electric thefts in front of the electric meter; when the electric theft is released, the electricity-limiting theft-proof protective device can restore electric supply automatically; the utility model can also limit electricity and protect the safety of human electric shock

Automatic control devicl against electricity theft.

Abstract: The utility model relates to a reliable automatic device against electricity theft which can monitor the whole segment of a user branch line from a supply main to a user's electric meter. When an electricity-stealing loop exists (an electricity-stealing load >=10W ), the supply line within a controlled segment can be immediately cut off; after the electricity-stealing loop is relieved, power supply can be automatically reset. The utility model can replace the mode of selectively examining the circuit adopted by electric power departments at present against the electricity theft, and the mode is man made and less in revenue with short time; therefore, the utility model has the functions of preventing the electricity theft, saving the labor, and saving the financial resources and the energy resource.