Showing papers on "Electricity meter published in 1981"

System for monitoring utility usage.

Abstract: Electronic circuitry monitors the electrical energy consumption of a system and displays the current cost of the energy usage. The projected monthly billing cost is calculated at the current rate of consumption, and an alarm signal and control output are generated if the projected cost is higher than a budget amount. Energy consumption is sensed optically at the electric meter (3) and a proportional number of high frequency pulses are added to the household electrical network. These pulses are remotely sensed at any point within the household electrical network and are fed to a microprocessor (50) for counting and conversion to cost parameters. Clock pulses are also directed to the microprocessor (50) for calculating the billing period and for displaying time parameters. A keyboard (70) enables initializing and modifying the cost and time parameters in the microprocessor (50).

Microprocessor based energy consumption meter

Abstract: This invention relates to an electricity meter mainly intended for measuring, registration and reading of one or more consumers' electricity power consumption and/or energy consumption. To the electricity meter a display (12) is connected which is adapted to indicate momentary power consumption, present electricity tariff and accumulated energy consumption expressed in monentary units. The electricity meter is an electronic construction and includes a central processing unit (1) with a microprocessor, one sensor(2) intended for detecting of a consumer's power consumption and a number of memory cells (1a-52d) adapted in a predetermined manner to consecutively receive and store information, calculated and transferred by the central processing unit (1). The electricity meter is also adapted to be connected to a read unit (5) by which stored information and electricity tariffs can be transferred to a central computer, located at, for example, an electrical power producer.

Power meter for high energy lasers

Abstract: A power meter for non-destructively measuring the power of a high energy er beam. The power meter includes a cell disposed in the flow path of a gas containing a laser radiation-absorbing species. The absorption coefficient of the absorbing species is small enough to allow the beam to pass through the cell essentially unaltered. The concentration of the absorbing species is modulated to modulate its absorption of the laser beam power and produce acoustic waves in the gas which can be detected and measured to give an absolute measurement of the power in the high energy laser beam.

Circuit for supervising an electronic electricity meter

Abstract: In an electronic energy consumption meter using a mark-space amplitude multiplier, including a current-frequency transducer, a first supervisory circuit is coupled to, and supervises the mark-space modulator multiplier, a second supervisory circuit is coupled to, and supervises the current-frequency transducer, and a fault indicator is coupled to the output of each of the supervisory circuits for indicating a fault in the meter.

Traceable calibration of a cardiac defibrillator energy meter

Abstract: This paper discusses the development, intercomparison and agreement of two independent, traceable methods—one calorimetric and one digital sampling—for the measurement of the energy of cardiac defibrillator pulses. It describes the use of the sampling method to calibrate a defibrillator energy meter, a commercial instrument which is used for the routine calibration of defibrillators. Some observations on methods of making future measurements on energy meters and on possible designs for digital energy meters are included. Fuller details are available in a UK National Physical Laboratory (NPL) Report.

Radio-controlled devices for use in power distribution circuits

Abstract: A radio-controlled device for use in a power distribution circuit, typically for tariff-switching, load-shedding or off-peak load-switching purposes, includes a radio receiver having an aerial circuit which includes a ferrite annulus. The device is typically mounted in an electricity meter connected in the power distribution circuit, with the ferrite annulus surrounding one or more wires of the distribution circuit down-circuit of the meter. The wire or wires surrounded by the ferrite annulus, which typically extend all over the house or other building in which the meter and the device are installed, therefore serve as an aerial for the radio receiver in the device, thus alleviating the problems which can arise when the device is mounted in a location where radio reception is poor.

Electronic three-phase electricity meter

Abstract: 1. An electronic three-phase electricity meter, wherein a multiplier unit (MR, MS, MT) is provided for each phase, supplied at its input end with signals proportional to the current and voltage associated with the phase, and emits a power-proportional output signal (~Ur , ~Us , ~Ut ) that is added to the output signals of the other multiplier units to form a sum signal which is converted in a quantizer (Q) into a pulse train (I1) having a power-proportional frequency and then integrated with respect to time in a counting device (Z) for the energy to be detected, and the result displayed, characterised in that for one (R) of the three phases (R, S, T) an additional power detection device is provided, consisting at least of one multiplier unit (MR1, MP) and a test quantizer (Q1), which device supplies at its output end a pulse train (I2) having a power-proportional frequency, and that a comparator device (E) is provided for the two pulse trains (I1, I2) supplied by the quantizer (Q) and the power detection device, which comparison device triggers a signal change in a display unit (L) when the ratio of the frequencies of the two pulse trains (I1, I2) exceeds the limits of a specified tolerance band, these limits being selected such that the breakdown of an essential component leads to the exceeding of a limit, existing function elements (WIR, WUR, MR; WIR, WUR, TR, INR) of the three-phase electricity meter (DZ) also being used for the additional power detection device (Fig. 1, Fig. 2).

Electrical time switch

Abstract: An electrical timer switch for determining the times of day at which electricity is to be supplied to a load has different seasonal timing schedules and includes a selector circuit which selects the correct schedule in accordance with the season of the year. The timer switch may be mounted between the contact elements of an adapter which is arranged to be located between a supply of mains electricity and an electricity meter. Initial time and calendar information are supplied to the time switch by a separate monitor unit comprising a battery-fed set-up box.

Energy consumption for the Echo Station (DSS 12)

Abstract: Energy consumption for the Echo Station is analyzed. The HVAC equipment including vapor compression refrigeration units, absorption chillers, and heating units such as boilers and heat pumps is shown to be the largest consumer of electrical energy. The energy consumption for the buildings at the station is itemized and compared to the electrical meter data. The figures for energy consumption as predicted by the ECP computer program are found to agree well with the meter data.

Electricity meter checking device - comprises portable case housing meter with digital read=out and calibrated current generator

Abstract: The device comprises a case with four connecting leads which are to be attached to the input and output of the domestic electricity meter The electricity meter must have an isolating switch to disconnect any load from the meter The case includes circuitry producing a calibrated current at one of a number of set levels - 5,10,15,20,30,40 and 60 A - according to the position of a switch One the top of the case is a seven-digit display giving a reading to show the energy consumed when one of the set currents has been produced, as measured by the internal circuit of the case To test a meter in situ the case is linked to the meter by its four leads, and a number of currents are produced in turn to check operation over a range of values up to a maximum of 60 A

Support for facilitating reading of an electric meter

Abstract: A support for an electric meter of the type used to measure energy supplied to customers of electric power companies or the like. The support is interposed between the meter and its customary base or socket and is settable to face the meter in either of two directions other than that in which it normally faces whereby to facilitate reading of the meter and also to enable a meter reader to read two or more meters from a single viewpoint.

Measuring device for residual quantity of electricity of secondary battery

Abstract: PURPOSE:To ensure a high-accuracy measrement for the residual quantity of electricity of the secondary battery, by inserting the current detection element into the charge/discharge path to amplify the detection signal and then connecting the electrolytic electricity meter to the amplifying circuit. CONSTITUTION:For instance, the charging current delivered from charger 10 during the charging passes through current detection element 12 via contact 11a of charge/ discharge switch 11 and then sent to secondary battery 13 for charging. The charging current is detected at the side of 12a by element 12, and this output is amplified through current amplifier 14 into the sufficient current to actuate electrolytic coulombmeter 18. In correspondence to 12a, 18a is supplied in the positive polarity to meter 18, and then the deposition is started by the electrolysis. In this instant, the gain of amplifier 14 is controlled via gain setting adjuster 16 in consideration of the charging efficiency according to the type of the secondary battery. In such way, the residual quantity of electriciy can be measured for the secondary battery with a small loss and a high accuracy.

Testing accurate single or multiple phase electricity meters - using integrating voltage, power and phase control loops

Abstract: A meter test device for a single or multiple phase electricity meter is for effective or wattless testing in triple or four conductor circuits with synthetic multiple supplies for the voltage inputs and current inputs of the device under test. The test device consists of a controller, power amplifiers for impresses voltages and currents, power measurement devices, and operating field and an evaluation device for tested meter errors. It is capable of testing extremely accurate electricity meters. This is achieved by providing the phases with electronically regulated constant power. Integrating control loops regulate the amplitudes of the voltages, their relative phase relationships, their phases w.r.t. a reference, and the power in all phases. Signals are obtained from the tested meter and compared to enable detection of deviations from expected results.

Capacitor discharge electronic single-phase electricity meter - has stabilised direct voltage supply providing reference voltage for calibration

Abstract: An electronic single-phase electricity meter operating on the capacitor discharge principle has a time division multiplexer multiplying the load voltage and a signal proportional to the current. The integrated current signal is compared with two limit values and a pulsed signal derived whose pulse frequency is proportional to power. Its circuitry is simplified compared to conventional arrangements so as to make it more economical and compact. Its direct voltage supply source has a precision voltage regulator in one or both branches. The stabilised direct voltage output acts as a reference voltage for all the calibration defining circuit elements. An operational amplifier comparator circuit is used. This drives an EXCLUSIVE-OR gate via a diode. The other gate input is connected to the reference potential and its output to the comparator positive input.