CN1328586C - Electric energy quality monitoring, recording and analyzing system - Google Patents
Electric energy quality monitoring, recording and analyzing system Download PDFInfo
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- CN1328586C CN1328586C CNB2004100645845A CN200410064584A CN1328586C CN 1328586 C CN1328586 C CN 1328586C CN B2004100645845 A CNB2004100645845 A CN B2004100645845A CN 200410064584 A CN200410064584 A CN 200410064584A CN 1328586 C CN1328586 C CN 1328586C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The present invention relates to an electric energy quality monitoring, recording and analyzing system which belongs to a monitoring, recording and analyzing system for electric energy quality. The present invention mainly solves the problems of high price, single function and poor monitoring and analyzing quality of the existing electric energy quality monitoring device. In order to realize the tasks, the present invention has the technical scheme that the electric energy quality monitoring, recording and analyzing system is composed of a data collecting module, a data processing and analyzing module, a data display output module and a man-machine interface module, wherein the output end of the data collecting module is connected with the input end of the data processing and analyzing module, the input end of the data display output module is connected with the output end of the data processing and analyzing module, and the output end of the man-machine interface is connected with a control interface of the processing and analyzing module and the input end of the data display output module. The present invention has the advantages of powerful analysis statistical functions of database management and data measurement, multiple networking functions, etc.
Description
Technical field
The present invention relates to a kind of electric energy quality monitoring, recording and analyzing system, it belongs to a kind of the quality of power supply is carried out the system that monitoring record is analyzed.
Background technology
In modern industry enterprise and transportation department, non-linear electric load is rolling up.Development along with Power Electronic Technique, thyristor rectifier and commutation technique are widely used, for example: metallurgy, chemical industry, mine department use thyristor rectified power supply in a large number, a large amount of RHVC of using in the industry, adopt the locomotive that exchanges the single-phase rectifier power supply in the electric railway, current conversion station in the high-voltage large-capacity direct current transportation, the frequency conversion of household electrical appliance etc. make the power network load sharply strengthen.Particularly impact, nonlinear-load capacity constantly increase, and make power quality problems such as electrical network generation wave form distortion, voltage fluctuation.Power department not only will satisfy the user to the ever-increasing needs of amount of electrical power, but also the electric energy of acceptable quality will be provided.For addressing the above problem, people have worked out some and have had only the more single pertinent instruments instrument of function ratio, as harmonic analysis instrument, voltage fluctuation and flicker monitoring device etc., because these device prices are very expensive, can't popularize use.They also exist defectives such as function singleness, monitoring analysis be of poor quality in addition.
Summary of the invention
The objective of the invention is to solve that existing equipment for monitoring power quality exists costs an arm and a leg, function singleness, the ropy technological difficulties of monitoring analysis and a kind of cheap, multiple functional, electric energy quality monitoring, recording and analyzing system that the monitoring analysis quality is high is provided.
For realizing above-mentioned task, the technical solution used in the present invention is: electric energy quality monitoring, recording and analyzing system, and it is made up of data acquisition module, data processing and analysis module, data presentation output module and human-machine interface module, wherein:
1) data acquisition module is by four road voltage sensors, at least ten No. six current sensors, several analog switches, the several holding circuit, several peaking circuit and multi-channel data acquisition card constitute, four road voltage sensors are connected with the input end of analog switch with at least ten No. six current sensors, the output terminal of analog switch is connected with the input end of holding circuit, the output terminal of holding circuit is connected with the input end of peaking circuit, the output terminal of peaking circuit is connected with the input end of data collecting card, and the output terminal of data collecting card is connected with the input end of data processing and analysis module;
Described holding circuit is by chip LF398 U9, resistance R 1, R2, R3, variable resistor RW1 and capacitor C 1, C2, C3, C4, C5 forms, one end of resistance R 1 is connected with 3 ends of chip U9, the other end of resistance R 1 is connected with the output terminal of analog switch, one end ground connection of resistance R 2, the other end of resistance R 2 is connected with the stiff end of variable resistor RW1, another stiff end of variable resistor RW1 be connected with 1 end of chip U9 again after an end of capacitor C 1 is connected and be connected with+12V power supply, the movable end of variable resistor RW1 is connected with 2 ends of chip U9, capacitor C 1 other end ground connection, one end of capacitor C 2 is connected with 4 ends of chip U9 and connects-the 12V power supply, the other end ground connection of capacitor C 2, capacitor C 4 is connected with an end of capacitor C 3 and is connected with 6 ends of chip U9 with C5 series connection back one end, capacitor C 4 is connected back ground connection with its other end of C5 series connection back with the other end of capacitor C 3, the 7 end ground connection of chip U9, one end of resistance R 3 is connected with 8 ends of chip U9, the other end of resistance R 3 is connected with+5V power supply, and 5 ends of chip U9 are output terminal;
Described peaking circuit is by chip LM1558 U10A, LM1558 U10B, resistance R 4, R5, R6, R7, R8, R9, variable resistor RW2, capacitor C 6, C7, C8, C9, diode D1, D2, stabilivolt Z1 and Transient Voltage Suppressor T1 form, one end of resistance R 4 is connected with 5 ends of holding circuit chip U9, the negative pole of the other end of resistance R 4 and diode D1, the positive pole of diode D2, resistance R 5, the end of R6 and 3 ends that meet chip U10A after an end of capacitor C 7 is connected, the positive pole of diode D1 and 2 ends that meet chip U10A after the negative pole of diode D2 is connected, one end of capacitor C 6 and 2 ends that meet chip U10A after an end of resistance R 7 is connected, the other end of capacitor C 6 is connected back ground connection with the other end of resistance R 7, the stiff end of variable resistor RW2 is connected with the other end of resistance R 5, another stiff end of variable resistor RW2 and 1 end that meets chip U10A after the movable end of variable resistor RW2 is connected, the other end of capacitor C 7 is connected with another stiff end of variable resistor RW2, the other end of resistance R 6 is connected with the movable end of variable resistor RW2, chip U10A+termination+12V power supply, chip U10A-termination-12V power supply, one end of resistance R 8 is connected with 1 end of chip U10A, the other end of resistance R 8 is connected the back and is connected with 6 ends of chip U10B with an end of capacitor C 8, the other end ground connection of capacitor C 8,5 ends of chip U10B are connected with 7 ends of chip U10B, one end of resistance R 9 is connected with 7 ends of chip U10B, the negative pole of the other end of resistance R 9 and stabilivolt Z1, after being connected, one end of the negative pole of Transient Voltage Suppressor T1 and capacitor C 9 connects the input end of multi-channel data acquisition card, the positive pole of stabilivolt Z1, the other end of the positive pole of Transient Voltage Suppressor T1 and capacitor C 9 altogether;
2) data processing and analysis module are made of industrial control computer and data analysis software, are carried out respectively exporting to the data presentation output module after Harmonics Calculation analysis, power calculation, voltage and current calculating, the power factor calculating through data processing and analysis module employing wavelet analysis method by the voltage and current value of data collecting module collected;
3) the data presentation output module is made of the software module of LCD and demonstration output, the input end of LCD is connected with the output terminal of data processing and analysis module, so that the data of data processing and analysis module output and the order of human-machine interface module are shown;
4) human-machine interface module is made of industrial control software and industry control peripheral apparatus, the output terminal of human-machine interface module is connected with the control interface of data processing and analysis module and the input end of data presentation output module so that with user's command transfer to data processing and analysis module and data presentation output module.
Described four road voltage sensor V1, V2, V3, V4 are WB3V411S voltage isolation sensor, and the VGA of this sensor, VGB, VGC end are connected with S1～S4, S11～S14 end of analog switch MAX309 U7 and S11～S14 end of analog switch MAX309 U8.
Current sensor I1～I16 of described at least ten six tunnel is a WB3I411S electric current isolation sensor, and the VGA of this sensor, VGB, VGC end are connected with NO1～NO8 end of analog switch MAX308 U1～U6.
Described multi-channel data acquisition card, it has 12 A/D translation functions of gain, sampling rate is 100KS/s, the gain of each input channel can be programmed, integrated 4k sampling fifo buffer on the card, each the road signal after this capture card is proofreaied and correct correcting circuit are imported in data processing and the analysis module after this A/D conversion and are carried out record analysis.
Described industrial control computer is the one industrial computer.
Described industry control peripheral apparatus comprises CD-ROM drive, floppy drive, keyboard and mouse.
Because the present invention has adopted technique scheme, compares with background technology, has the following advantages:
1, can monitor the way nearly three-phase voltage and at least 16 road three-phase currents of 4 tunnel different electric pressures, can understand the various situations of the quality of power supply of electrical network rapidly and all sidedly, catch and write down every transient waveform of electrical network, realize monitoring in real time the every power quality parameter of electrical network and the real-time automatic on-line monitoring at scene.
2, the analytic statistics function that has powerful data base administration and measurement data, by the data of being gathered are managed and analyze, can obtain mains frequency, voltage (electric current) effective value, each harmonic voltage and current effective value, phase place, fundamental power, first-harmonic and harmonic impedance, three-phase voltage and current imbalance degree, equivalence positive sequence, negative phase-sequence, residual voltage and electric current, various electrical network parameters such as three-phase voltage fluctuation are for power supply and user provide the foundation that detects and judge the quality of power supply.
3, adopt wavelet analysis method, make quality of power supply evaluation more accurately perfect; When detected signal breaks down or special circumstances the time, signal can be undergone mutation, and detects these jump signals, just can analyze the running status of the signal fault and the quality of power supply, judge and control.After having adopted wavelet analysis method, just can these jump signals of check and analysis, make that the quality of power supply in the electric energy quality monitoring analytic system is more accurate.
4, have many networked function.By the transmission mode (as telephone wire, RS232,485, RTU or the like) of various data such as the built-in MODEM of system, Ethernet, network interface card, serial ports, cooperate corresponding application software, can interconnect with power information net or INTERNET easily.Can realize on-line maintenance by INTERNET, realize many network managements of the quality of power supply.
5, possesses multichannel control output function and cheap.
Description of drawings
Fig. 1 is a block diagram of the present invention;
Fig. 2 is the circuit diagram of data acquisition module.
Embodiment
As shown in Figure 1, the electric energy quality monitoring, recording and analyzing system in the present embodiment, it is made up of data acquisition module, data processing and analysis module, data presentation output module and human-machine interface module, wherein:
1) data acquisition module is by four road voltage sensors, at least ten No. six current sensors, six analog switches, nine tunnel holding circuits, No. nine peaking circuits and multi-channel data acquisition card constitute, four road voltage sensors are connected with the input end of analog switch with at least ten No. six current sensors, the output terminal of analog switch is connected with the input end of holding circuit, the output terminal of holding circuit is connected with the input end of peaking circuit, the output terminal of peaking circuit is connected with the input end of data collecting card, and the output terminal of data collecting card is connected with the input end of data processing and analysis module;
2) data processing and analysis module are made of one industrial computer (AWS8248VT) and data analysis software, by data collecting module collected the voltage and current value adopt wavelet analysis method to carry out respectively that Harmonics Calculation analysis, power calculation, voltage and current are calculated, power factor is exported to the data presentation output module after calculating through data processing and analysis module;
3) the data presentation output module is made of the software module of 15 inches big screen LCDs and demonstration output, the input end of LCD is connected with the output terminal of data processing and analysis module, so that the data of data processing and analysis module output and the order of human-machine interface module are shown;
4) human-machine interface module is by industrial control software and comprise that the industry control peripheral apparatus of CD-ROM drive, floppy drive, keyboard and mouse constitutes, the output terminal of human-machine interface module is connected with the control interface of data processing and analysis module and the input end of data presentation output module so that with user's command transfer to data processing and analysis module and data presentation output module.
As shown in Figure 2, above-mentioned four road voltage sensor V1, V2, V3, V4 are WB3V411S voltage isolation sensor, and the VGA of this sensor, VGB, VGC end are connected with S1～S4, S11～S14 end of analog switch U7 (MAX309) and S11～S14 end of analog switch U8 (MAX309).
As shown in Figure 2, current sensor I1～I16 of above-mentioned at least ten six tunnel is a WB3I411S electric current isolation sensor, and the VGA of this sensor, VGB, VGC end are connected with NO1～NO8 end of analog switch U1～U6 (MAX308).
As shown in Figure 2, above-mentioned nine tunnel holding circuits are made up of the holding circuit of six road electric currents and three road voltages, the holding circuit on each road is by chip U9 (LF398), resistance R 1, R2, R3, variable resistor RW1 and capacitor C 1, C2, C3, C4, C5 forms, one end of resistance R 1 is connected with 3 ends of chip U9, the other end of resistance R 1 is connected with the output terminal of analog switch, one end ground connection of resistance R 2, the other end of resistance R 2 is connected with the stiff end of variable resistor RW1, another stiff end of variable resistor RW1 be connected with 1 end of chip U9 again after an end of capacitor C 1 is connected and be connected with+12V power supply, the movable end of variable resistor RW1 is connected with 2 ends of chip U9, capacitor C 1 other end ground connection, one end of capacitor C 2 is connected with 4 ends of chip U9 and connects-the 12V power supply, the other end ground connection of capacitor C 2, capacitor C 4 is connected with an end of capacitor C 3 and is connected with 6 ends of chip U9 with C5 series connection back one end, capacitor C 4 is connected back ground connection with its other end of C5 series connection back with the other end of capacitor C 3, the 7 end ground connection of chip U9, one end of resistance R 3 is connected with 8 ends of chip U9, the other end of resistance R 3 is connected with+5V power supply, and 5 ends of chip U9 are output terminal.
As shown in Figure 2, above-mentioned No. nine peaking circuits are made up of the peaking circuit of six road electric currents and three road voltages, the peaking circuit on each road is by chip U10A (LM1558), U10B (LM1558), resistance R 4, R5, R6, R7, R8, R9, variable resistor RW2, capacitor C 6, C7, C8, C9, diode D1, D2, stabilivolt Z1 and Transient Voltage Suppressor T1 form, one end of resistance R 4 is connected with 5 ends of holding circuit chip U9, the negative pole of the other end of resistance R 4 and diode D1, the positive pole of diode D2, resistance R 5, the end of R6 and 3 ends that meet chip U10A after an end of capacitor C 7 is connected, the positive pole of diode D1 and 2 ends that meet chip U10A after the negative pole of diode D2 is connected, one end of capacitor C 6 and 2 ends that meet chip U10A after an end of resistance R 7 is connected, the other end of capacitor C 6 is connected back ground connection with the other end of resistance R 7, the stiff end of variable resistor RW2 is connected with the other end of resistance R 5, another stiff end of variable resistor RW2 and 1 end that meets chip U10A after the movable end of variable resistor RW2 is connected, the other end of capacitor C 7 is connected with another stiff end of variable resistor RW2, the other end of resistance R 6 is connected with the movable end of variable resistor RW2, chip U10A+termination+12V power supply, chip U10A-termination-12V power supply, one end of resistance R 8 is connected with 1 end of chip U10A, the other end of resistance R 8 is connected the back and is connected with 6 ends of chip U10B with an end of capacitor C 8, the other end ground connection of capacitor C 8,5 ends of chip U10B are connected with 7 ends of chip U10B, one end of resistance R 9 is connected with 7 ends of chip U10B, the negative pole of the other end of resistance R 9 and stabilivolt Z1, after being connected, one end of the negative pole of Transient Voltage Suppressor T1 and capacitor C 9 connects the input end of multi-channel data acquisition card, the positive pole of stabilivolt Z1, the other end of the positive pole of Transient Voltage Suppressor T1 and capacitor C 9 altogether.
As shown in Figure 2, above-mentioned data collecting card is multi-channel data acquisition card (PCI-1710L), it has 12 A/D translation functions of gain, sampling rate is 100KS/s, the gain of each input channel can be programmed, integrated 4k sampling fifo buffer on the card, each the road signal after this capture card is proofreaied and correct correcting circuit are imported in data processing and the analysis module after this A/D conversion and are carried out record analysis.
Claims (6)
1, a kind of electric energy quality monitoring, recording and analyzing system, it is made up of data acquisition module, data processing and analysis module, data presentation output module and human-machine interface module, it is characterized in that:
1) data acquisition module is by four road voltage sensors, at least ten No. six current sensors, several analog switches, the several holding circuit, several peaking circuit and multi-channel data acquisition card constitute, four road voltage sensors are connected with the input end of analog switch with at least ten No. six current sensors, the output terminal of analog switch is connected with the input end of holding circuit, the output terminal of holding circuit is connected with the input end of peaking circuit, the output terminal of peaking circuit is connected with the input end of data collecting card, and the output terminal of data collecting card is connected with the input end of data processing and analysis module;
Described holding circuit is by chip LF398 U9, resistance R 1, R2, R3, variable resistor RW1 and capacitor C 1, C2, C3, C4, C5 forms, one end of resistance R 1 is connected with 3 ends of chip U9, the other end of resistance R 1 is connected with the output terminal of analog switch, one end ground connection of resistance R 2, the other end of resistance R 2 is connected with the stiff end of variable resistor RW1, another stiff end of variable resistor RW1 be connected with 1 end of chip U9 again after an end of capacitor C 1 is connected and be connected with+12V power supply, the movable end of variable resistor RW1 is connected with 2 ends of chip U9, capacitor C 1 other end ground connection, one end of capacitor C 2 is connected with 4 ends of chip U9 and connects-the 12V power supply, the other end ground connection of capacitor C 2, capacitor C 4 is connected with an end of capacitor C 3 and is connected with 6 ends of chip U9 with C5 series connection back one end, capacitor C 4 is connected back ground connection with its other end of C5 series connection back with the other end of capacitor C 3, the 7 end ground connection of chip U9, one end of resistance R 3 is connected with 8 ends of chip U9, the other end of resistance R 3 is connected with+5V power supply, and 5 ends of chip U9 are output terminal;
Described peaking circuit is by chip LM1558 U10A, LM1558 U10B, resistance R 4, R5, R6, R7, R8, R9, variable resistor RW2, capacitor C 6, C7, C8, C9, diode D1, D2, stabilivolt Z1 and Transient Voltage Suppressor T1 form, one end of resistance R 4 is connected with 5 ends of holding circuit chip U9, the negative pole of the other end of resistance R 4 and diode D1, the positive pole of diode D2, resistance R 5, the end of R6 and 3 ends that meet chip U10A after an end of capacitor C 7 is connected, the positive pole of diode D1 and 2 ends that meet chip U10A after the negative pole of diode D2 is connected, one end of capacitor C 6 and 2 ends that meet chip U10A after an end of resistance R 7 is connected, the other end of capacitor C 6 is connected back ground connection with the other end of resistance R 7, the stiff end of variable resistor RW2 is connected with the other end of resistance R 5, another stiff end of variable resistor RW2 and 1 end that meets chip U10A after the movable end of variable resistor RW2 is connected, the other end of capacitor C 7 is connected with another stiff end of variable resistor RW2, the other end of resistance R 6 is connected with the movable end of variable resistor RW2, chip U10A+termination+12V power supply, chip U10A-termination-12V power supply, one end of resistance R 8 is connected with 1 end of chip U10A, the other end of resistance R 8 is connected the back and is connected with 6 ends of chip U10B with an end of capacitor C 8, the other end ground connection of capacitor C 8,5 ends of chip U10B are connected with 7 ends of chip U10B, one end of resistance R 9 is connected with 7 ends of chip U10B, the negative pole of the other end of resistance R 9 and stabilivolt Z1, after being connected, one end of the negative pole of Transient Voltage Suppressor T1 and capacitor C 9 connects the input end of multi-channel data acquisition card, the positive pole of stabilivolt Z1, the other end of the positive pole of Transient Voltage Suppressor T1 and capacitor C 9 altogether;
2) data processing and analysis module are made of industrial control computer and data analysis software, are carried out respectively exporting to the data presentation output module after Harmonics Calculation analysis, power calculation, voltage and current calculating, the power factor calculating through data processing and analysis module employing wavelet analysis method by the voltage and current value of data collecting module collected;
3) the data presentation output module is made of the software module of LCD and demonstration output, the input end of LCD is connected with the output terminal of data processing and analysis module, so that the data of data processing and analysis module output and the order of human-machine interface module are shown;
4) human-machine interface module is made of industrial control software and industry control peripheral apparatus, the output terminal of human-machine interface module is connected with the control interface of data processing and analysis module and the input end of data presentation output module so that with user's command transfer to data processing and analysis module and data presentation output module.
2, electric energy quality monitoring, recording and analyzing system according to claim 1, it is characterized in that: described four road voltage sensor V1, V2, V3, V4 are WB3V411S voltage isolation sensor, and the VGA of this sensor, VGB, VGC end are connected with S1～S4, S11～S14 end of analog switch MAX309 U7 and S11～S14 end of analog switch MAX309 U8.
3, electric energy quality monitoring, recording and analyzing system according to claim 1, it is characterized in that: current sensor I1～I16 of described at least ten six tunnel is a WB3I411S electric current isolation sensor, and the VGA of this sensor, VGB, VGC end are connected with NO1～NO8 end of analog switch MAX308 U1～U6.
4, electric energy quality monitoring, recording and analyzing system according to claim 1, it is characterized in that: described multi-channel data acquisition card, it has 12 A/D translation functions of gain, sampling rate is 100KS/s, the gain of each input channel can be programmed, integrated 4k sampling fifo buffer on the card, each the road signal after this capture card is proofreaied and correct correcting circuit are imported in data processing and the analysis module after this A/D conversion and are carried out record analysis.
5, electric energy quality monitoring, recording and analyzing system according to claim 1 is characterized in that: described industrial control computer is the one industrial computer.
6, electric energy quality monitoring, recording and analyzing system according to claim 1 is characterized in that: described industry control peripheral apparatus comprises CD-ROM drive, floppy drive, keyboard and mouse.
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| CNB2004100645845A CN1328586C (en) | 2004-12-06 | 2004-12-06 | Electric energy quality monitoring, recording and analyzing system |
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| CNB2004100645845A CN1328586C (en) | 2004-12-06 | 2004-12-06 | Electric energy quality monitoring, recording and analyzing system |
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| CN1328586C true CN1328586C (en) | 2007-07-25 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101957436B (en) * | 2009-07-20 | 2013-11-20 | 中国电信股份有限公司 | Power supply quality tester of IT (Information Technology) server equipment and test method |
| CN101718809B (en) * | 2009-11-13 | 2011-10-12 | 上海市电力公司 | System and method for acquiring power quality data |
| CN101762758B (en) * | 2009-11-30 | 2012-09-26 | 福建省电力试验研究院 | System for monitoring and orientating electric power quality pollution source in electric network |
| CN102005759A (en) * | 2010-11-17 | 2011-04-06 | 上海市电力公司 | System and method for acquiring electric power quality data from intelligent electric meter management system |
| FR3042075B1 (en) * | 2015-10-06 | 2018-10-12 | Universite De Poitiers | DETERMINATION OF HARMONIC POLLUTION ON AN ELECTRIC POWER DISTRIBUTION NETWORK |
| CN110690757B (en) * | 2019-09-09 | 2023-04-28 | 上海科梁信息科技股份有限公司 | Data monitoring device of electric power transmission and distribution system |
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| US4058768A (en) * | 1977-01-07 | 1977-11-15 | General Electric Company | Two-way electronic kWh meter |
| US4283772A (en) * | 1979-03-30 | 1981-08-11 | Westinghouse Electric Corp. | Programmable time registering AC electric energy meter having electronic accumulators and display |
| CN1101983A (en) * | 1993-10-20 | 1995-04-26 | 刘建强 | Popular auto-time-sharing tariff meter for electric consumption |
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| US4058768A (en) * | 1977-01-07 | 1977-11-15 | General Electric Company | Two-way electronic kWh meter |
| US4283772A (en) * | 1979-03-30 | 1981-08-11 | Westinghouse Electric Corp. | Programmable time registering AC electric energy meter having electronic accumulators and display |
| CN1101983A (en) * | 1993-10-20 | 1995-04-26 | 刘建强 | Popular auto-time-sharing tariff meter for electric consumption |
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