CN1314972C - Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus - Google Patents
Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus Download PDFInfo
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- CN1314972C CN1314972C CNB2004100818948A CN200410081894A CN1314972C CN 1314972 C CN1314972 C CN 1314972C CN B2004100818948 A CNB2004100818948 A CN B2004100818948A CN 200410081894 A CN200410081894 A CN 200410081894A CN 1314972 C CN1314972 C CN 1314972C
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Abstract
The present invention relates to a method and a device for detecting failure of a metering current transformer or electricity theft prevention in an electric energy metering device on a line at real time. The device is composed of a high-frequency exciting module 1, a signal coupling module 2, a signal sampling module 3, a signal processing module 4, a judging module 5, a state outputting module 6, a power supply module 7, a clock module 8, a state recording module 9, a state displaying module 10, a network communication module 11, etc. Compared with the existing detection device of the metering current transformer, the method and the device for detecting failure of a metering current transformer or electricity theft prevention on a line at real time of the present invention can effectively solve the key problems of low accuracy, poor real time and reliability, incapability of realizing on-line detection, etc. in the detection of failure of the metering current transformer or electricity theft prevention in the existing electric energy metering, and can be widely applied to the electric energy metering of an electric power system and the detection record of electricity theft prevention.
Description
Affiliated technical field
The invention belongs to current transformer failure metering or anti-electricity-theft detection in the electric energy metrical, particularly relate to a kind of current transformer failure metering or anti-electricity-theft real-time on-line detecting method and device.
Background technology
In the prior art, the fault of metering current mulual inductor and anti-electricity-theft detection normally detect at faults such as the secondary coil insulating property reduction of metering current mulual inductor, turn-to-turn short circuit, input and output terminal loose contact, transformer ratio, the artificial open circuit of secondary output loop and short circuits.Its detection method by the artificial visually examine, is carried out casual inspection to the watt-hour meter in outward appearance, external cabling terminal and the electric power meter of metering current mulual inductor normally in the erecting stage of metering current mulual inductor.Its testing result is judged by following several modes usually: 1) whether improper metering determines whether metering current mulual inductor exists a small amount of faults that characterize such as input and output terminal loose contact, secondary output loop open circuit and short circuit according to the connection situation of the appearance change of metering current mulual inductor, external cabling terminal and the watt-hour meter in the electric power meter; 2) adopt common voltage table and reometer, the voltage and current of monitoring using electricity system, according to using electricity system voltage have or not and the variable quantity and the variation tendency of system power estimate whether metering current mulual inductor exists fault; 3) input end at electric network source installs prime dedicated test current transformer additional, judges according to the quantity of dedicated test current transformer and metering current mulual inductor secondary output current value quantity poor, performance number quantity difference poor, the electric degree number whether metering current mulual inductor exists fault or stealing.More than several detection modes in utilization, have defectives such as real-time, accuracy, poor reliability, online detectability is subjected to restriction greatly and influence, stealing detection and judged result authenticity are poor, can not satisfy current transformer failure metering or anti-electricity-theft accurately, reliable, request for utilization that real-time online detects.
Summary of the invention
The purpose of this invention is to provide a kind of current transformer failure metering or anti-electricity-theft real-time on-line detecting method and device, this detection method and device can effectively solve in the existing electric energy metrical current transformer failure metering or anti-electricity-theft detection accuracy is low, real-time and poor reliability, inconvenient operation, can not the real-time online detection record etc. key issue.
Current transformer failure metering or anti-electricity-theft real-time on-line detecting method and device, it by high frequency pumping module 1, signal coupling module 2, signal sampling module 3, signal processing module 4, judge module 5, state output module 6, power module 7, clock module 8, state recording module 9, state display module 10, network communication module 11, etc. module form.Wherein: high frequency pumping module 1 is used to produce high-frequency excitation signal, and provides high-frequency excitation signal to signal coupling module 2, provides reference signal to signal processing module 4 simultaneously.Signal coupling module 2 links to each other with high frequency pumping module 1, signal sampling module 3, and signal coupling module 2 is used to isolate forceful electric power loop and the weak electrical loop of high frequency pumping module 1 and the weak electrical loop of signal sampling module 3 of metering current mulual inductor; The forceful electric power loop that signal coupling module 2 is exported to metering current mulual inductor with the coupling of the high-frequency excitation signal of high frequency pumping module 1, and the high frequency feedback signal in metering current mulual inductor forceful electric power loop is coupled to signal sampling module 3.The high frequency feedback signal that signal sampling module 3 is used for metering current mulual inductor forceful electric power loop that signal coupling module 2 is provided carries out processing backward signal processing modules 4 such as real-time online signal sampling, amplification, filtering, shaping provides feedback signal.Signal processing module 4 links to each other with high frequency pumping module 1, signal sampling module 3, the reference signal that high frequency pumping module 1 provides is carried out processing such as analog to digital conversion, and the feedback signal that signal sampling module 3 provides carried out reference signal and feedback signal after handling being delivered to judge module 5 after analog to digital conversion, digital filtering, fourier transform etc. handle.Judge module 5 links to each other with signal processing module 4, and the signal that signal processing module 4 is exported carries out analysis and judgement, when metering current mulual inductor breaks down, delivers to state output module 6 automatically to fault type and the separate judgement of classifying, and with judged result.State output module 6 links to each other with judge module 5, and when metering current mulual inductor broke down, state output module 6 was exported current transformer failure metering or anti-electricity-theft type and taken place separate according to standard data format.
Description of drawings
Accompanying drawing 1 is a modular structure block diagram of the present invention.
Accompanying drawing 2 is another modular structure block diagram of the present invention.
Accompanying drawing 3 is the high frequency pumping module circuit diagram.
Accompanying drawing 4 is a signal coupling module circuit diagram.
Accompanying drawing 7 is the judge module circuit diagram.
Accompanying drawing 8 is a state output module circuit diagram.
Accompanying drawing 9 is power module circuitry figure.
Accompanying drawing 10 is the clock module circuit diagram.
Accompanying drawing 12 is a state display module circuit diagram.
Embodiment
Below in conjunction with accompanying drawing current transformer failure metering provided by the invention or anti-electricity-theft real-time on-line detecting method and device are further described:
The on-line measuring device that this programme provides, it is made up of high frequency pumping modular circuit, signal coupling module circuit, signal sampling modular circuit, signal processing module circuit, judge module circuit, state output module circuit, power module circuitry, clock module circuit, state recording modular circuit, state display module circuit, network communication module circuit; Wherein: the circuit of high frequency pumping module 1 comprises: constitute sine-wave generator by integrated operational amplifier U15 (LM324), resistance R 54～R57 (1K), R58～R59 (10K), capacitor C 51～C54 (4700p), C55～C57 (0.01uF); High frequency pumping module 1 produces the frequency of 30kHz～60kHz and the amplitude high-frequency signal of 1V～3V, and high-frequency signal is defeated by signal coupling module 2 as pumping signal, and simultaneously high-frequency signal is defeated by signal processing module 4 as reference signal; The circuit of signal coupling module 2 comprises: coupling retarder L1～L2 (10T), transient voltage absorption diode SA1～SA2 (SA5.0CA), resistance R 10 (2.7K); Signal coupling module 2 is isolated the forceful electric power loop of high frequency pumping module 1 and metering current mulual inductor, and to the forceful electric power loop of metering current mulual inductor coupling output high-frequency excitation signal, the forceful electric power loop of signal coupling module 2 isolation signals sampling modules 3 and metering current mulual inductor, and the high frequency feedback signal in metering current mulual inductor forceful electric power loop is coupled to signal sampling module 3, signal coupling module 2 is eliminated influence and the destruction of the heavy current loop of metering current mulual inductor to current transformer failure metering or anti-electricity-theft real time on-line detection device by isolation coupling; The circuit of signal sampling module 3 comprises: integrated operational amplifier U1 (LM324), resistance R 11～Rl5 (5.1K), R16 (15K), capacitor C 5 (0.01uF); High frequency feedback signal in the forceful electric power loop that 3 pairs of signal coupling modules of signal sampling module 2 produce carries out real-time online signal sampling, amplification, filtering, shaping processing, and the feedback signal after will handling is defeated by signal processing module 4; The circuit of signal processing module 4 comprises: digital integrated circuit U4 (TLC1543C), microprocessor U5 (P89C668), the feedback signal that 4 pairs of signal sampling modules 3 of signal processing module provide is carried out electrical network fundamental signal and the harmonic signal in analog to digital conversion, digital filtering, fourier transform processing and the filtering feedback signal, and feedback signal is transformed into the phase digital signal, the amplitude digital signal that not influenced by line voltage and load and is defeated by judge module 5
In accompanying drawing 7, the circuit of judge module 5 comprises: microprocessor U5 (P89C668); The reference phase digital signal that 5 pairs of signal processing modules 4 of judge module provide, the reference amplitude digital signal, feedback phase digital signal and feedback amplitude digital signal are carried out current transformer failure metering or anti-electricity-theft analysis and judgement, its fault judgement principle is: adopt phase-comparison method, the amplitude relative method, adaptive algorithm etc., in feedback signal complicated and changeable, extract current transformer failure metering or anti-electricity-theft various characteristic signals, and according to current transformer failure metering or anti-electricity-theft characteristic signal, whether metering Current Transformer Secondary coil insulation performance reduces in the analysis and judgement electric energy metrical, whether short circuit of turn-to-turn, whether loose contact of input and output terminal, whether transformer ratio changes, and whether the secondary output loop opens a way and fault such as short circuit, and to exporting to state output module 6 after the failure modes identification.
In accompanying drawing 8, the circuit of state output module 6 comprises: microprocessor U5 (P89C668), photoisolator OP1～OP2 (PS2501-1), LED, hummer (SPEAKER), resistance R 17～R18 (1K), R20 (1K), R21 (10K); State output module 6 is used to export the separate and fault type signal of fault that judge module 5 provides.State output module 6 has multiple mode signal output, signal output can be modes such as coding output, data bus output, the output of I2C bus, level output at least, and state output module 6 also can be to current transformer failure metering or the anti-electricity-theft real-time online sound and light alarm that carries out.
In accompanying drawing 9, the circuit of power module 7 comprises: power transformer T1, rectifier bridge D8, electrochemical capacitor C8～C9 (2200uF), resistance R 30～R31 (2.2K), diode D9～D14 (1N4007), backup battery group BT2-1～BT2-1 (6V), integrated stable voltage circuit U2 (7805), U3 (7905); Power module 7 is for pick-up unit provides working power, and when pick-up unit external power source dead electricity, the power module 7 uninterrupted backup battery groups that start provide working power for pick-up unit.
Another modular structure block diagram of the present invention is provided by accompanying drawing 2, and it has increased clock module 8, state recording module 9, state display module 10, network communication module 11 on the basis of accompanying drawing 1, is used for another enforcement purpose of this programme.
In accompanying drawing 10, the circuit of clock module 8 comprises: clock circuit U6 (PCF8563F), electric battery BT1 (3.6V), resistance R 26 (10R), capacitor C 4 (0.1uF), C6～C7 (22P), diode D3 (1N4007), crystal oscillator XT1 (32.768K); Clock module 8 provides real-time timing signal for pick-up unit, and clock module 8 has clock check and correction function.
In accompanying drawing 11, the circuit of state recording module 9 comprises: number storage U7 (24LC256); The separate accurate recording that carries out takes place to current transformer failure metering or anti-electricity-theft zero-time and concluding time, failure mode, fault in state recording module 9 under the common control of judge module 5, clock module 8; All data of state recording module 9 have password and power-down protection, include fault zero-time and concluding time, failure mode in every record data content at least, data such as separate take place fault.State recording module 9 can write down the operational factor of metering current mulual inductor, and as master datas such as set-up time, calibration interval, current transformer device numbering, metering method, transformer ratios, the operational factor record has password and power-down protection equally.Exportable state display module 10 and the network communication module 11 given of the data recording of state recording module 9.
In accompanying drawing 12, the circuit of state display module 10 comprises: microprocessor U5 (P89C668), Chinese character LCD LCD, digital integrated circuit U8 (74HC04), U9 (74HC00); State display module 10 is subjected to the common control of clock module 8 and state recording module 9, the current dynamic time data that read clock module 8 provides, and data such as the fault data in the show state logging modle 9, operational factor.
In accompanying drawing 13, the circuit of network communication module 11 comprises: microprocessor U5 (P89C668), integrated circuit U10 (MAX1487), resistance R 19 (1K), R22～R25 (10K), R27～R28 (680R), R29 (2K) photoisolator OP3～OP5 (PS2501-1), diode D4～D7 (1N4007); The output interface of network communication module 11 includes RS232 interface and RS485 interface, with Surveillance center of management of power use department computing machine, be that host computer carries out connected network communication, its connected network communication mode can be the direct and host computer networkings of modes such as power carrier, cable transmission, optical cable transmission, far infrared transmission, wireless transmission, forms the connected network communication network.The connected network communication mode can also be passed through other communication systems, networks with host computer indirectly as power load supervisory system, Automatic meter reading system etc., forms the connected network communication network.
The fault record data that network communication module 11 provides state recording module 9, by the connected network communication network, communication protocol according to the rules, when metering current mulual inductor breaks down, in time send failure message to intra-office Surveillance center computing machine,, Rapid Alarm real-time to current transformer failure metering or anti-electricity-theft realization, the various data recording of while in host computer delivery status logging modle 9, and can receive the host computer instruction, revise the parameter that is provided with in the state recording module 9, and clock module 8 is carried out the clock check and correction.
Most preferred embodiment
Current transformer failure metering provided by the invention or anti-electricity-theft real-time on-line detecting method and device, its microprocessor can produce the square-wave signal of 30k-60k, after outside shaping circuit shaping, form the sine wave signal of standard, after the excitation amplifying circuit amplifies, periodically metering secondary is carried out scanning analysis, measurement loop produces two kinds of different characteristic signals when sweep signal is arranged in no extraneous sweep signal, characteristic signal is by the coupling of computing and self-adaptive processing algorithm, calculate the Various types of data in the metering secondary, judge accurately whether the secondary coil insulating property reduce metering current mulual inductor, turn-to-turn short circuit, the input and output terminal loose contact, transformer ratio changes, and whether the secondary output loop opens a way and all kinds of faults or stealing information such as short circuit, and record also shows beginning and ending time of fault or stealing, fault type, fault is separate.And fault or stealing information that can be by communication network real-time Transmission metering current mulual inductor, in time judging and handling current mulual inductor malfunction or stealing provides effective detection method and pick-up unit.
Current transformer failure metering provided by the invention or anti-electricity-theft real-time on-line detecting method and device, compare with existing metering current mulual inductor pick-up unit, the pick-up unit that this programme provides can detect current transformer failure metering or anti-electricity-theft realization real-time online under the various methods of operation of high and low voltage electric distribution electrical network, the present invention has network communicating function, can report to the police to various faults in the electric power meter real-time.Both can be used as the function expanding module of other relevant measurement instrument in the electric energy metrical, also can constitute the failure detector of metering current mulual inductor separately; The current transformer failure metering in the existing electric energy metrical can be effectively solved or the accuracy in the anti-electricity-theft detection is low, real-time and poor reliability, can not realize key issue such as online detection, electric system electric energy metrical and anti-electricity-theft detection record can be widely used in.
Claims (9)
1, a kind of current transformer failure metering or anti-electricity-theft real-time on-line detecting method and device, it by high frequency pumping module 1, signal coupling module 2, signal sampling module 3, signal processing module 4, judge module 5, state output module 6, power module 7, clock module 8, state recording module 9, state display module 10, network communication module 11, etc. module form, wherein: high frequency pumping module 1 is used to produce high-frequency excitation signal, and provide high-frequency excitation signal to signal coupling module 2, provide reference signal to signal processing module 4 simultaneously; Signal coupling module 2 links to each other with high frequency pumping module 1, signal sampling module 3, and signal coupling module 2 is used to isolate forceful electric power loop and the weak electrical loop of high frequency pumping module 1 and the weak electrical loop of signal sampling module 3 of metering current mulual inductor; The forceful electric power loop that signal coupling module 2 is exported to metering current mulual inductor with the coupling of the high-frequency excitation signal of high frequency pumping module 1, and the high frequency feedback signal in metering current mulual inductor forceful electric power loop is coupled to signal sampling module 3; The high frequency feedback signal that signal sampling module 3 is used for metering current mulual inductor forceful electric power loop that signal coupling module 2 is provided carries out processing backward signal processing modules 4 such as real-time online signal sampling, amplification, filtering, shaping provides feedback signal; Signal processing module 4 links to each other with high frequency pumping module 1, signal sampling module 3, the reference signal that high frequency pumping module 1 provides is carried out processing such as analog to digital conversion, and the feedback signal that signal sampling module 3 provides carried out reference signal and feedback signal after handling being delivered to judge module 5 after analog to digital conversion, digital filtering, fourier transform etc. handle; Judge module 5 links to each other with signal processing module 4, and the signal that signal processing module 4 is exported carries out analysis and judgement, when metering current mulual inductor breaks down, delivers to state output module 6 automatically to fault type and the separate judgement of classifying, and with judged result; State output module 6 links to each other with judge module 5, and state output module 6 is exported current transformer failure metering or anti-electricity-theft type and taken place separate according to standard data format.
2, current transformer failure metering according to claim 1 or anti-electricity-theft real-time on-line detecting method and device is characterized in that: described device is made up of high frequency pumping modular circuit, signal coupling module circuit, signal sampling modular circuit, signal processing module circuit, judge module circuit, state output module circuit, power module circuitry, clock module circuit, state recording modular circuit, state display module circuit, network communication module circuit; Wherein: the circuit of high frequency pumping module 1 comprises: constitute sine-wave generator by integrated operational amplifier U15 (LM324), resistance R 54～R57 (1K), R58～R59 (10K), capacitor C 51～C54 (4700p), C55～C57 (0.01uF); High frequency pumping module 1 produces the frequency of 30kHz～60kHz and the amplitude high-frequency signal of 1V～3V, and high-frequency signal is defeated by signal coupling module 2 as pumping signal, and simultaneously high-frequency signal is defeated by signal processing module 4 as reference signal; The circuit of signal coupling module 2 comprises: coupling retarder L1～L2 (10T), transient voltage absorption diode SA1～SA2 (SA5.0CA), resistance R 10 (2.7K); Signal coupling module 2 is isolated the forceful electric power loop of high frequency pumping module 1 and metering current mulual inductor, and to the forceful electric power loop of metering current mulual inductor coupling output high-frequency excitation signal, the forceful electric power loop of signal coupling module 2 isolation signals sampling modules 3 and metering current mulual inductor, and the high frequency feedback signal in metering current mulual inductor forceful electric power loop is coupled to signal sampling module 3, signal coupling module 2 is eliminated influence and the destruction of the heavy current loop of metering current mulual inductor to current transformer failure metering or anti-electricity-theft real time on-line detection device by isolation coupling; The circuit of signal sampling module 3 comprises: integrated operational amplifier U1 (LM324), resistance R 11～R15 (5.1K), R16 (15K), capacitor C 5 (0.01uF); High frequency feedback signal in the forceful electric power loop that 3 pairs of signal coupling modules of signal sampling module 2 produce carries out real-time online signal sampling, amplification, filtering, shaping processing, and the feedback signal after will handling is defeated by signal processing module 4; The circuit of signal processing module 4 comprises: digital integrated circuit U4 (TLC1543C), microprocessor U5 (P89C668), the feedback signal that 4 pairs of signal sampling modules 3 of signal processing module provide is carried out electrical network fundamental signal and the harmonic signal in analog to digital conversion, digital filtering, fourier transform processing and the filtering feedback signal, and feedback signal is transformed into the phase digital signal, the amplitude digital signal that not influenced by line voltage and load and is defeated by judge module 5.
3, according to the described current transformer failure metering of claim 1 or anti-electricity-theft real-time on-line detecting method and device, it is characterized in that: the circuit of described judge module 5 comprises: microprocessor U5 (P89C668), and the reference phase digital signal that 5 pairs of signal processing modules 4 of judge module provide, reference amplitude digital signal, feedback phase digital signal, feedback amplitude digital signal are carried out analysis and judgement to current transformer failure metering or stealing type; The detection method of its fault or stealing type comprises phase-comparison method, amplitude relative method, adaptive algorithm, interruption scanning method; Microprocessor U5 (P89C668) produces the square-wave signal of 30k-60k, after outside shaping circuit shaping, form the sine wave signal of standard, after the excitation amplifying circuit amplifies, periodically metering secondary is carried out scanning analysis, measurement loop produces two kinds of different characteristic signals when sweep signal is arranged in no extraneous sweep signal, characteristic signal is by the coupling of computing and self-adaptive processing algorithm, calculate the Various types of data in the metering secondary, judge accurately whether the secondary coil insulating property reduce metering current mulual inductor, turn-to-turn short circuit, the input and output terminal loose contact, transformer ratio changes, and whether the secondary output loop opens a way and all kinds of faults or stealing information such as short circuit, and record also shows beginning and ending time of fault or stealing, fault type, fault is separate.
4, according to the described current transformer failure metering of claim 1 or anti-electricity-theft real-time on-line detecting method and device, it is characterized in that: the circuit of state output module 6 comprises: microprocessor U5 (P89C668), photoisolator OP1～OP2 (PS2501-1), LED, hummer (SPEAKER), resistance R 17～R18 (1K), R20 (1K), R21 (10K); State output module 6 provides fault separate and fault type signal for output judge module 5, and state output module 6 comprises coding, data bus, I
2Output types such as C bus, level, 6 pairs of current transformer failure meterings of state output module or stealing realize the real-time online sound and light alarm.
5, according to the described current transformer failure metering of claim 1 or anti-electricity-theft real-time on-line detecting method and device, it is characterized in that: the circuit of described power module 7 comprises: power transformer T1, rectifier bridge D8, electrochemical capacitor C8～C9 (2200uF), resistance R 30～R31 (2.2K), diode D9～D14 (1N4007), backup battery group BT2-1～BT2-1 (6V), integrated stable voltage circuit U2 (7805), U3 (7905); Power module 7 is for pick-up unit provides working power, and when pick-up unit external power source dead electricity, the power module 7 uninterrupted backup battery groups that start provide working power for pick-up unit.
6, according to the described current transformer failure metering of claim 1 or anti-electricity-theft real-time on-line detecting method and device, it is characterized in that: the circuit of described clock module 8 comprises: clock circuit U6 (PCF8563F), electric battery BT1 (3.6V), resistance R 26 (10R), capacitor C 4 (0.1uF), C6～C7 (22P), diode D3 (1N4007), crystal oscillator XT1 (32.768K); Clock module 8 provides real-time timing signal for pick-up unit.
7, according to the described current transformer failure metering of claim 1 or anti-electricity-theft real-time on-line detecting method and device, it is characterized in that: the circuit of described state recording module 9 comprises: number storage U7 (24LC256), state recording module 9 is under the common control of judge module 5, clock module 8, to zero-time, concluding time, kind, the separate record that carries out of fault or stealing; And the data of logging modle 9 are defeated by state display module 10 and network communication module 11.
8, according to the described current transformer failure metering of claim 1 or anti-electricity-theft real-time on-line detecting method and device, it is characterized in that: the circuit of described state display module 10 comprises: microprocessor U5 (P89C668), Chinese character LCD LCD, digital integrated circuit U8 (74HC04), U9 (74HC00), state display module 10 is subjected to the common control of clock module 8, state recording module 9, and shows dynamic time data, fault data and operational factor.
9, according to the described current transformer failure metering of claim 1 or anti-electricity-theft real-time on-line detecting method and device, it is characterized in that: the circuit of described network communication module 11 comprises: microprocessor U5 (P89C668), integrated circuit U10 (MAX1487), resistance R 19 (1K), R22～R25 (10K), R27～R28 (680R), R29 (2K) photoisolator OP3～OP5 (PS2501-1), diode D4～D7 (1N4007), the output interface of network communication module 11 comprises RS232, the RS485 interface, its networking mode comprises power carrier, cable transmission, the optical cable transmission, the far infrared transmission, modes such as wireless transmission.
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| CNB2004100818948A CN1314972C (en) | 2004-12-29 | 2004-12-29 | Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus |
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| CNB2004100818948A CN1314972C (en) | 2004-12-29 | 2004-12-29 | Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus |
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| US5654642A (en) * | 1992-09-09 | 1997-08-05 | Henkels & Mccoy | System and method of use for conducting a neutral corrosion survey |
| US6388451B1 (en) * | 2000-08-16 | 2002-05-14 | Ford Global Technologies, Inc. | Leakage current cancellation device |
| CN1382994A (en) * | 2002-03-25 | 2002-12-04 | 重庆龙源科技产业发展有限公司 | Intelligent network method for detecting and recording electric energy metering failure |
| CN1414396A (en) * | 2002-05-21 | 2003-04-30 | 重庆龙源科技产业发展有限公司 | Method and device for real time on line detection of metering current mulual inductor malfunction |
| CN1419131A (en) * | 2002-12-18 | 2003-05-21 | 王荣安 | Intelligent fraudulent use prevention electric energy measuring method and device thereof |
-
2004
- 2004-12-29 CN CNB2004100818948A patent/CN1314972C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5654642A (en) * | 1992-09-09 | 1997-08-05 | Henkels & Mccoy | System and method of use for conducting a neutral corrosion survey |
| US6388451B1 (en) * | 2000-08-16 | 2002-05-14 | Ford Global Technologies, Inc. | Leakage current cancellation device |
| CN1382994A (en) * | 2002-03-25 | 2002-12-04 | 重庆龙源科技产业发展有限公司 | Intelligent network method for detecting and recording electric energy metering failure |
| CN1414396A (en) * | 2002-05-21 | 2003-04-30 | 重庆龙源科技产业发展有限公司 | Method and device for real time on line detection of metering current mulual inductor malfunction |
| CN1419131A (en) * | 2002-12-18 | 2003-05-21 | 王荣安 | Intelligent fraudulent use prevention electric energy measuring method and device thereof |
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| CN1632606A (en) | 2005-06-29 |
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