Showing papers on "Electricity meter published in 1993"

Method and system for sensing removal of a utility meter from its socket

Abstract: A method and system is disclosed for indication and prevention of tampering with an electricity meter having control circuitry for automatic remote reading. The control circuitry, provided externally of the meter in a base or base extension, to which the meter is connected, is also used for tamper detection. Embodiments of the invention include use of optical sensing, voltage detection and proximity detection. Ambient light sensing may be performed to detect separation of the meter from the external receptacle. Reflected light to a reflective surface of the meter is sensed to determine if the meter is properly engaged. Presence of a meter connection plug element may be sensed either optically or by position responsive switch. Voltage of the utility supply and meter user output may be monitored to determine tampering.

Method of managing electric power on the basis of tariff schedules, in a network within a dwelling or the like

Abstract: The invention relates to a method allowing the management of electric power on the basis of the tariff schedules in force in a network (20) within a dwelling. The method according to the invention is based on communication which is established automatically between domestic appliances (201-205, 207, 210) and a so-called electric power manager unit (211) of which the task is, in particular, to coordinate the management of tariff schedules. The method makes it possible to slave the operation of appliances (201-205, 207, 210) to the tariff status in force which is known to the manager (211) by means of a link with an electricity meter (200) fitted in the network (20).

Electrical energy meter with programmable register component

Abstract: An energy meter capable of converting from one mode of operation to another mode of operation is described. In the one embodiment, the present apparatus measures energy consumption, and converts operation from a first mode to a second mode.

Transmitting information for remote reading of electricity meter - using common carrier frequency along power line with each meter station reducing its set credit value at each transmission

Abstract: The transmission procedure uses the power distribution network (7) for data transmission between a source station and a number of subscriber stations, using modulation of a carrier frequency. All the subscriber stations coupled to the network (7) use the same transmission carrier frequency, the transmitting stations assigned a credit value which is updated simultaneous with the data transmission. The carrier signals are accurately synchronised, to prevent loss of information upon summation of the transmission signals, via a phase correction circuit (R) for the carrier signal generator (1). ADVANTAGE - Reduced complexity and overall cost.

Device to pull electric meter

Abstract: A device to provide a quick and safe elimination of the supply of electricity to a building. The device attaches to the protective housing of the electric meter and permits the user to remain at a safe distance while further providing leverage to be applied to the meter to facilitate removal. If arcing of the electricity flowing through the meter occurs, the operator is safe from it harmful effects. It being recognized that during firefighting operations water is being applied in vast quantities and the dangers of arcing are significantly increased when water is present. The elimination of the supply of electricity to a building on fire is necessary to ensure the safety of the firefighters and other emergency personnel. The device is simple to apply and is applicable to all known types and sizes of meters. The extensive use of nonconductive materials, in the design of the device, ensure the safety of the user. Once the housing cover is opened or removed the device is secured to the protective cover of the meter by encircling the cover with a strap or band. A wedge shaped, or raised section, is provided to ensure a secure attachment to the protective cover, which generally tapers slightly inward toward the exposed end. Upward or downward pressure is then applied to the opposing end from attachment, the meter is pivoted, the connections disengage, the meter is removed from its housing, and the flow of electricity is terminated, while the operator remains at a safe distance.

Process for testing an electronic electricity meter

Abstract: An electronic electricity meter (1) has an optical interface (5, 6) used to test the load curve of the meter. When a test telegram is received from a testing device (7, 8, 9), the microcomputer (2) of the meter (1) switches loading meter pulses onto the optical interface (5, 6).

Watt and voltampere transfer standard

Abstract: A new instrument which will be used as a transfer device between the national watt and VA standards of the National Research Council of Canada and the standards maintained by Canadian electrical utilities and electricity meter manufacturers is described. The relative error of this instrument is less than 50 ppm for power or energy and 100 PPM for voltampere measurements. The stability of the instrument during a field test cycle of about two weeks was on the order of 20 ppm. A dedicated pulse-frequency counter and a stable phantom power source were supplied to utilities to achieve high-accuracy on-site measurements. >

Building managing system

Abstract: PURPOSE:To automatically detect the fault of a meter. CONSTITUTION:A controller 30 inputs detected values from various meters 19-28. A detected value of a received power meter 19 should be equal to a sum of detected values of a facility side power meters 20-23. Then, a total sum of power amounts of a predetermined time detected by the meters 20-23 is compared with that detected by the meter 19 during the time, and a fault of any of the meters 19-23 is judged if a difference of the both is a predetermined error or more.

Apparatus and method for measuring electrical energy and quadergy and for performing line frequency compensation

Abstract: 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 load quadergy, based on variations between the actual line frequency and the rated line frequency of the meter. Reactive load quadergy is determined by phase-shifting the line voltage by a fixed time interval, based on the rated line frequency of the meter. The determined reactive load quadergy is adjusted to compensate for variations in line frequency. Because the determined reactive load quadergy is output by an electric meter as a continuous pulse train, adjustment to the determined reactive load quadergy is performed by adding or subtracting state changes from the pulse train and then registering the adjusted reactive load quadergy.

Electric spoon type intelligent electric power meter

Abstract: The utility model relates to an intelligent electric power meter which is mainly composed of a current circuit, a voltage sensor, an analogue-digital conversion circuit, a single chip computer, and an electric spoon which is used for storing the instruction of a power supply administration department and the electrical energy used by users. The utility model has the key point that the analogue-digital conversion circuit of the electric meter is a circuit which can digitize the analog type current and the voltage signals directly. The single chip computer is a special-purpose single chip computer that can directly calculate the active power, the reactive power and the electric degree by the digitized current and the voltage signal. The matched electric spoon adopts the encapsulation structure with small volume. The intelligent electric power meter has the advantages of small electrical power consumption, low cost price, high accuracy, and reliable and durable effect. The utility model is appropriate for industrial departments and civil users.

Handy meter reading system

Abstract: PURPOSE:To read an electric meter while leaving both hands free by not requiring an operator to hold a meter reader at the time of the inspection of a meter. CONSTITUTION:Hook parts 20 and 21 joining a terminal 1 and a meter reader 8 are formed on each case of the terminal 1 and the meter reader 8. The terminal 1 and the meter reader 8 are provided with a light emitting diode 6 comprising the combination 5, 5 of an optical interface for the mutual optical communication and a photo transistor 7. The combinations 5,5 are arranged opposite each other with the terminal 1 and the meter reader 8 joined. Further, a magnet 19 turning on a read switch 13 inserted into the power supply circuit of the terminal 1 in a joint state is provided on the meter reader 8.

Pliers type electric power meter

Abstract: The power meter consists of pliers type current transformer, power range transformer, logarithmic shunter and meter indicator, in which logarithmic shunter is a main component comprised of a shunted rheostat, it can measure the actual power on a loaded low voltage line

Electric meter timer for preventing fraudulent use of electricity

Abstract: The utility model relates to an electric meter timer for preventing fraudulent use of electricity, which is composed of a sampling comparison circuit, a driving executive circuit, a commutation filtering circuit and a timer. The utility model can accurately record the time of the fraudulent use of the electricity of a user, and can calculate the quantity of the fraudulent use of the electricity of the user according to the average electricity consumption of the user. The utility model can be directly installed on an existing electric meter, and has the advantages of simple structure, easy installation, low cost and wide popularization and use.

Tamper-proofing for consumption meters

Abstract: A transparent cover is fitted over a consumption meter, such as an electricity meter, to protect it against unauthorized interference or betray tampering. The cover (9, 19) cooperates with the supporting surface (2) on which the meter is mounted to enclose the meter against mechanical access, but permits the meter to be read. An anchor member (10) is secured to said supporting surface within the enclosure and penetrates the cover. The protruding end has a tamper-proof seal applied to it.

Safety circuit for medical laser scalpel - detects parameters of test oscillation applied to all circuit components e.g. relay shutter, and power supply cut=off switch

Abstract: The circuit initiates the self testing of the laser system, and switches off a faulty component when failure is detected. The system includes a laser generator, with a power meter, power supply, and power controller. Semiconductor devices are provided for quick closing of the shutter or cut-off of the power supply, w.r.t. the monitored laser power. The cut-off operation may be carried out when the minimum switch-off time of the system is no longer maintained. A comparator circuit compares the actual and desired values of the control circuit and the result is used to trigger the safety circuit. ADVANTAGE - Prevents harm to patient. Continuous self-testing of reliable operation.

Energizing devices for kilowatt hour meter displays

Abstract: A device for energizing the electronic digital display found on current kilowatt hour meters in order to read the digital display of meters that have been removed from their site location that is simple to operate. The device would allow service personnel even those inexperienced with kilowatt hour meters to read the meter even if they are located in remote areas. In particular, the structure of the device will enable service personnel or the local utility office to read the meter without having to locate an energized meter socket with the correct terminal arrangement and correct voltage, or to taking the meter to an off-site meter test shop. The device generally incorporates a 13 terminal kilowatt hour meter socket and a six terminal kilowatt hour meter socket which are connected to a 120 volt power source through a step-up transformer.

Consumer electrical panel

Abstract: The panel for a consumer is intended to accommodate, side by side, the electricity meter and the supply circuit breaker. It comprises: a backplate, a platen, a lockable single-piece upper cap (30; 130) and a freely removable lower cap (40; 140).

Proposed high-accuracy superconducting power meter for millimeter waves

Abstract: A prototype bolometer is described which offers potential as a nearly ideal power meter by absorbing and measuring nearly all of the incident power. The load developed for this bolometer is shown to reflect no more than 0.01% of the incident power. Assuming that the losses in niobium are no greater than those in lead, the power absorbed by the bolometer but not measured is less than 0.02% over a significant fraction of the WR-22 band (33-50 GHz). If the DC substitution error can be reduced to a comparable level, the proposed bolometer offers a possibility of improving the accuracy of millimeter-wave power measurement by an order of magnitude. >

Electric meter installation box

Abstract: The utility model relates to an electric meter installation box. A meter recorder needs climbing to an enough height for recording the value of the existing electric meter installed, and the value of the existing electric meter is read from the window of an installation box with an aligned vision field. The utility model provides the electric meter installation box composed of a bottom plate with a coil-out hole, and a box body with a window. The utility model is characterized in that the upper and the lower edges of the window are provided with opposed plane mirrors; the display number of the electric meter is imaged at the lower plane mirror, and is reflected to the upper plane mirror to be imaged once more and reflected to ground surface; thus, people standing at the ground in a proper range can view the image of digit in the upper plane mirror by looking upwards, and the value of the electric meter can be read. The utility model has the advantages of simple structure, and convenient and correct number reading.

Power network carrier wave control and management system

Abstract: The system includes a central control unit, a relay station and user carrier intellegent electricity meters to form a control and communication network; the power line is used for carrier communication; the central control station includes carrier transceiver, photoelectric coupling, display circuit, monolithic computer, microcomputer and power supply; the relay station includes measuring circuit, monolithic computer and the necessary carrier transceiver circuits, photoelectric coupling circuit and display circuit; the carrier intellengent electricity meter includes A/D conversion circuit, monolithic computer system, program storage, display and its selective circuits and power supply.

Changeable electric meter

Abstract: The utility model relates to a changeable electric meter, which belongs to a metering instrument in the electricity consumption and comprises a measurer, a programming parameter memory, an accumulator of electrical degrees and electricity fees and a display The utility model changes the setting fee rating into the floating fee rating on the basic of the existing 'charging by time ' function of meters The utility model is characterized in that a calculator to calculate the real-time floating fee rating is added in the circuit construction, and a measurer for the real-time power factor cos phi is added in the measurer The utility model can calculate the bonus and punish for the electricity fee of powerless compensation according to the real-time power factor, and can charge in real-time by the no-stage high-price floating fee rating to the over-quota electricity consumption according to the exceeding degree

Polyphase emulator for single phase circuit

Abstract: An emulator which is able to operate on a standard single phase 120 VAC line, generates simulated three-phase alternating current in order to demonstrate the operation of a polyphase electricity meter The emulator is also capable of demonstrating the operation of the polyphase electricity meter which has been incorrectly wired into the polyphase circuit, ie, with incorrect or missing connections to the current transformers; or in which there are problems with the phasing of the polyphase circuit, ie, incorrect phase differences between circuits or between the currents and voltages within any of the phases

Improvements to the subject of main patent number 9000076(5) for a Consumer electricity meter

Abstract: Improvements to the subject of principal patent number 9000076(5) for a Consumer electricity meter in which communication between the electricity meter and a concentrator is done by means of the low-voltage grid and consists of a current transformer communicating with the main microprocessor having a program in which a maximum current threshold is indicated with its limits of time and value so that if this is exceeded, the main circuit switch is opened. For application in electricity distribution.

Intelligent electric power meter correcting gauge

Abstract: The utility model discloses a correcting gauge which is suitable for verifying a three-phase three-wire system two elements intelligent electric power meter in a power utilization administration department. The utility model adopts a monolithic computer hardware system, so that a standard electric energy meter in the correcting gauge and other function circuits achieve unification; two standard electric power meters of impulse type in the existing correcting gauge are replaced by a standard electric power module by modular programming; the hardware is replaced by the software; the hardware circuits, such as a phase sequence judgment circuit, etc., are replaced by a judging module which can judge the wire connection correctly or wrongly; the function of judgment is enriched and the intellectualized degree is enhanced. The interface of the man-machine conversation is provided by adopting a dot array type liquid crystal display and a tactile keyboard. The utility model has the advantages of simple structure, full function, high precision and low cost, which is a novel full intelligent portable electric meter correcting gauge.

Electric meter capable of avoiding or indicating fradulent use of electricity

Abstract: The utility model discloses an electric meter capable of avoiding or indicating the fraudulent use of electricity, comprising a pulse timing circuit which is additionally arranged in a common electric meter, and a board inserting type connection box. The electric meter capable of avoiding or indicating fraudulent use of electricity can be used to prevent the fraudulent use of electricity, and can judge and meter the amount of the fraudulent use of electricity. The utility model has the advantages of simple structure, easy fabrication.

Multi-user central control computerized electric meter

Abstract: The utility model is composed of a voltage transformer, a current transformer, a transmitter, an A/D converter, a single chip computer processing system, an electrical leakage overcharge protecting, controlling and executing mechanism, a printer interface and a serial communication interface The utility model respectively collects the circuit input and output electric current of each user, and the voltage of a total power supply cord; 12 groups of data are collected for each voltage cycle, and the amount of power consumption can be calculated by an improved Fourier algorithm; the set of running parameters and the control of running can be completed through the serial communication interface, and the results can be printed and output through the printer interface The utility model can be shared by one building or tens of users in a dwelling area, and can be used for realizing remote control through a long-range communication circuit in an office by the department of power supply

High-accuracy laser power meter

Abstract: A laser power meter has been developed which can measure absolute power output to better than 0.1%. The power meter has a flat spectral response from ultraviolet to far infrared and is essentially 100% linear over its full dynamic range. The power meter has long term stability better than 0.001% per day. The operation of the power meter is discussed and performance measurement data are presented.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Method for automatic calibration of electricity meters and apparatus therefor.

Abstract: The electricity meters (1) which in each case have one single-phase measuring unit (7) per phase of each type of energy measured are interconnected with a reference electricity meter (2), generating a reference frequency (fR,j), power-feeding sources (3, 4) and phase shifter (5) in such a manner that the single-phase measuring units (7) and the reference electricity meter (7) each measure an identical power value of an identical type of energy which is located within one of a number of power ranges into which the power measuring range of the electricity meters (1) is subdivided. In each single-phase measuring unit (7), its pulse frequency, which is proportional to the measured power, is multiplied by a calibration and correction factor for each power range for the purpose of generating a frequency fS,j. Starting from a starting instant, pulses, the frequency of which is equal to the reference frequency (fR,j) multiplied by KMD,j = [RZ/RR,j].[KA/nS] are counted during a time window ns/f s,j. RR,j is the number of pulses per energy unit of the reference frequency (fR,j). RZ is a counter constant, KA is a time matching factor and ns is a stored number. The count obtained is stored as value of a calibration factor and called up in operation, for example when the power associated with the measured energy is within the relevant power range. Its subsequent multiplication by a correction factor results in the value of the calibration and correction factor. The method and the arrangement permit the automatic calibration of complex electricity meters in a particularly simple manner.

Intelligent electricity power meter with fee caculation

Abstract: The utility model relates to an intelligent electricity power meter with fee calculation, which belongs to the technical field of electric meters. A voltage and current sampling circuit takes samples of a power line, and after null detection and analogue-to-digital conversion, the samples are input to a 8031CPU and input to a display unit after the calculation of the CPU. The data signal input from an external charging card for the electricity fee is input into the CPU for the setting of a new electricity fee value, and when the bought electricity fee is used up, a control unit automatically cuts off the power source. The external data input unit and the interior power-off protection memory are respectively composed of two C850 static memories, a small button cell and a CC4024 chip.

Energy-saving and anti-stealing electricity apparatus for electric meter

Abstract: The utility model provides an electric meter, in particular to an energy-saving and anti-stealing electricity apparatus for a single-phase electric meter. The utility model contains an electronic switch connected in series and a capacitance connected in parallel on the voltage coil of the electric meter, wherein, the electronic switch is composed of a current transformer, a rectifying and filtering circuit, a current limiting voltage stabilizing circuit and a switching circuit.