CN101975911B - Earth fault judging method for overhead line fault indicator - Google Patents

Earth fault judging method for overhead line fault indicator Download PDF

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Publication number
CN101975911B
CN101975911B CN2010105030058A CN201010503005A CN101975911B CN 101975911 B CN101975911 B CN 101975911B CN 2010105030058 A CN2010105030058 A CN 2010105030058A CN 201010503005 A CN201010503005 A CN 201010503005A CN 101975911 B CN101975911 B CN 101975911B
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fault
earth
line
detector
earth fault
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CN101975911A (en
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李刚
魏立新
罗晓
刘彬
赵鸿运
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Shanghai Siyuan Rugao Technology Development Co Ltd
Siyuan Electric Co Ltd
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Shanghai Siyuan Rugao Technology Development Co Ltd
Siyuan Electric Co Ltd
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    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses an earth fault judging method for an overhead line fault indicator in the technical field of power grids. A voltage signal on an open-delta side of a three-phase potential transformer on a bus of a power grid to be detected is introduced into a signal output end of a quintuple harmonic generator; a plurality of fault indicators are arranged on a plurality of sections of overhead power lines of the power grid to be detected; and after a permanent earth fault reaches the judging time, the quintuple harmonic generator outputs specific coding waves communicating between a system power supply and a fault line of an earth point to the power grid to be detected through the open-delta side of the three-phase potential transformer so as to realize earth fault positioning. The earth fault judging method avoids the defects of the conventional fault indicators in distribution network system application and improves the accuracy of judging the earth fault.

Description

The earth fault decision method that is used for the overhead transmission line fault detector
Technical field
What the present invention relates to is a kind of method of electric power network technical field, specifically is a kind of earth fault decision method that is used for the overhead transmission line fault detector.
Background technology
Line fault in the electrical network mostly occurs at power distribution network, directly affects social production, and fault location point promptly and accurately becomes extremely important.In recent years, the application of overhead transmission line fault detector brings great convenience to troubleshooting, in electrical network, has obtained using widely.But mostly the power distribution network of China is isolated neutral system or small current neutral grounding system, and for the bigger short trouble of fault current, fault detector has certain accuracy, and for earth fault, the accuracy of fault detector reduces greatly.Although production producer and research institution have carried out deep research to this problem, the progress of making a breakthrough property not remains a difficult problem to the accurate judgement of earth fault.
Through the retrieval in prior art field is found: one Chinese patent application number 00132100.5; Publication number CN1360212; Put down in writing a kind of " hung indicator for low-current grounding failure of single-phase transmission line ", the quintuple harmonics of system itself carried out fault verification when this techniques make use network system broke down.But there is certain shortcoming in its fault verification method: during system generation earth fault, the quintuple harmonics semaphore of system own is little, and receives the influence of fault type and network system easily, and fault verification is unreliable, and accuracy is low.
Further retrieval finds that Chinese patent publication number CN2501061Y has put down in writing a kind of " ground connection and short trouble indicator "; Chinese patent publication number CN2935175Y has put down in writing a kind of " supply line's fault detector "; Chinese patent publication number CN2886588Y has put down in writing a kind of " high-voltage fence global function fault detector "; Chinese patent publication number CN201045627Y has put down in writing a kind of " intelligent electric power fault detector " etc.These technology are utilized simple mimic channel more, and the fault-signal of sampling circuit itself is judged line fault; This class methods principle is simple, judges coarsely, receives the influence erroneous judgement of system easily or does not declare; For the bigger short trouble of fault current; Have certain accuracy,, then can't accurately judge for the less earth fault of fault-signal characteristic quantity.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists, a kind of earth fault decision method that is used for the overhead transmission line fault detector is provided, avoided the deficiency of existing fault detector on distribution network system is used, improve the accuracy that earth fault is judged.
The present invention realizes through following technical scheme, the present invention includes following steps:
The first step, the voltage signal of the open delta side of threephase potential transformer on the bus of electrical network to be measured is introduced on the signal output part of quintuple harmonics generator, several fault detectors are installed in respectively on the plurality of sections overhead power line of electrical network to be measured;
Second step, be higher than the phase voltage of 35% distribution network system and kept 5 seconds or above can not the elimination voluntarily promptly judged permanent earth fault is taken place when the residual voltage of the open delta side of distribution network system; This residual voltage is the line fault signal, reaches the specific coding ripple that the quintuple harmonics generator only circulates through the electrical network output to be measured of the open delta side direction of threephase potential transformer after the judgement time at the generation permanent earth fault on the faulty line of system power supply and earth point;
The 3rd step, after the fault detector on the faulty line detects the line fault signal, get into the fault verification state: fault detector receives the specific coding ripple on the detection line in sense cycle; When receiving the specific coding ripple, then start indicating fault; Earth fault then is on this fault detector and the same circuit between the adjacent fault detector that does not start indicating fault, is grounded localization of fault.
Described quintuple harmonics generator is to be core parts with PC104 module, DSP module; The open delta residual voltage of monitoring system; Whether decision-making system earth fault takes place, and injects the quintuple harmonics signal wave of short time several times to system when breaking down in system.
Described fault detector is core parts with pincerlike precision current mutual inductor, super low-power consumption MSP430 intelligent chip, and when confirming fault, the flicker of the pilot lamp of fault detector realizes indicating fault.
Described specific coding ripple is meant: the quintuple harmonics signal wave, to inject continuously 4 times, and each injection length is 0.3 second, the time interval of injection was followed successively by 1 second, 1.5 seconds and 2 seconds.
The present invention injects the specific coding ripple by the quintuple harmonics generator to faulty line; Fault detector on the faulty line is grounded fault verification through detecting this specific coding ripple; Power distribution network isolated neutral system and small current neutral grounding system have been overcome because earth-fault current signal characteristic value is less, receive external interference strong; Be difficult for judging the shortcoming of trouble spot, improved earth fault and judged accuracy; This earth fault decision method obtains the specific coding ripple through the quintuple harmonics generator, carries out fault verification according to the detection to the specific coding ripple, and is irrelevant with network system parameter and earth fault type, do not receive system interference, and earth fault judges that reliability is high; The quintuple harmonics semaphore of specific coding ripple is little in addition, injection length short, can not give system's deleterious impact.
Description of drawings
Fig. 1 is a schematic flow sheet of the present invention.
Fig. 2 is an embodiment testing circuit synoptic diagram.
Fig. 3 is the embodiment current diagram.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As depicted in figs. 1 and 2, present embodiment may further comprise the steps:
The first step, quintuple harmonics generator 3 is installed in the transformer station, the voltage measurement end of quintuple harmonics generator 3 and quintuple harmonics output terminal are respectively with the open delta of threephase potential transformer 2 and connect; Fault detector 5 distributes and is installed on the overhead transmission line 6;
Described quintuple harmonics generator is to be core parts with PC104 module, DSP module, and it is used for the open delta residual voltage of monitoring system, thereby whether decision-making system earth fault takes place, and injects the specific coding ripple to system when breaking down in system;
Described fault detector is core parts with pincerlike precision current mutual inductor, super low-power consumption MSP430 intelligent chip, is used for fault-signal on the detection line, carries out fault verification, and when confirming fault, the flicker of the pilot lamp of fault detector realizes indicating fault.
Second step, the residual voltage that detects the open delta of threephase potential transformer 2 when quintuple harmonics generator 3 are higher than the phase voltage of 35% distribution network system; This overvoltage condition can not be eliminated in 5 seconds voluntarily, judged that then permanent earth fault has taken place distribution network system; After the judgement time, quintuple harmonics generator 3 injects the specific coding ripple to system, and this specific coding ripple only circulates on the faulty line of system power supply and earth point;
The described judgement time is 0.5 second;
The quintuple harmonics signal wave of described specific coding ripple for changing, as shown in Figure 3, the waveform of I5 is the quintuple harmonics current effective value change curve in time on the fault circuit; T1 is the time that fault takes place; T2 is the injection length of specific coding ripple, and Δ t is each injection length, and Δ t is 0.3 second; Δ t1, Δ t2, the time interval of Δ t3, be respectively 1 second, 1.5 seconds and 2 seconds for injecting.
After fault detector 5 on the 3rd step, the faulty line detects line fault signal and specific coding ripple, utilize specific fault verification method to realize indicating fault;
Described specific fault decision method is meant:
1) when earth fault takes place; The ground capacitance of system produces capacitance current under the effect of false voltage, this capacitance current is added on the load current of circuit, and the circuit fundamental current is changed; As shown in Figure 3; The waveform of I1 is the fundamental current effective value curve over time on the circuit, and fault detector 5 detects after fundamental current changes on the circuit, gets into the fault verification state;
2) behind setting-up time, whether the electric current of fault detector 5 beginning detection lines has the specific coding ripple, if detect the specific coding ripple, then starts indicating fault, if do not detect the specific coding ripple, does not then start indicating fault;
3) earth fault just is between the fault detector that does not have indicating fault adjacent on fault detector and the same circuit of indicating fault.
Present embodiment is compared with the fault verification method of existing fault indicator; Have certain advance, the specific coding ripple that it injects to faulty line by the quintuple harmonics generator, the overhead transmission line fault detector is through the detection to this coding ripple; Real earth fault is judged; This earth fault decision method principle is directly perceived, and accuracy is high, has solved the problem that fault detector can not accurately be judged earth fault; And decision method does not receive the restriction of systematic parameter and the interference of signal, and the fault verification reliability is high.

Claims (3)

1. an earth fault decision method that is used for the overhead transmission line fault detector is characterized in that, may further comprise the steps:
The first step, the voltage signal of the open delta side of threephase potential transformer on the bus of electrical network to be measured is introduced on the signal output part of quintuple harmonics generator, several fault detectors are installed in respectively on the plurality of sections overhead power line of electrical network to be measured;
Second step, be higher than the phase voltage of 35% distribution network system and kept 5 seconds or above can not the elimination voluntarily promptly judged permanent earth fault is taken place when the residual voltage of the open delta side of distribution network system; This residual voltage is the line fault signal, reaches the specific coding ripple that the quintuple harmonics generator only circulates through the electrical network output to be measured of the open delta side direction of threephase potential transformer after the judgement time at the generation permanent earth fault on the faulty line of system power supply and earth point;
The 3rd step, after the fault detector on the faulty line detects the line fault signal, get into the fault verification state: fault detector receives the specific coding ripple on the detection line in sense cycle; When receiving the specific coding ripple, then start indicating fault; Earth fault then is on this fault detector and the same circuit between the adjacent fault detector that does not start indicating fault, is grounded localization of fault;
Described specific coding ripple is meant: the quintuple harmonics signal wave, to inject continuously 4 times, and each injection length is 0.3 second, the time interval of injection was followed successively by 1 second, 1.5 seconds and 2 seconds;
The described judgement time is 0.5 second.
2. the earth fault decision method that is used for the overhead transmission line fault detector according to claim 1; It is characterized in that; Described quintuple harmonics generator is to be core parts with PC104 module, DSP module; The open delta residual voltage of monitoring system, whether decision-making system earth fault takes place, and injects the quintuple harmonics signal wave of short time several times to system when breaking down in system.
3. the earth fault decision method that is used for the overhead transmission line fault detector according to claim 1; It is characterized in that; Described fault detector is core parts with pincerlike precision current mutual inductor, super low-power consumption MSP430 intelligent chip; When confirming fault, the flicker of the pilot lamp of fault detector realizes indicating fault.
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CN102426317B (en) * 2011-08-29 2014-02-26 北京豪锐达科技有限公司 Fault detection method of intelligent power grid
CN102364355A (en) * 2011-10-12 2012-02-29 华北电力大学 Test device for performance of overhead line fault indicator
CN103995214B (en) * 2014-04-15 2016-06-08 刘骐畅 Aerial line intelligence localization of fault treatment system and method thereof
DE102014210290A1 (en) * 2014-05-30 2015-12-03 Bender Gmbh & Co. Kg METHOD AND DEVICE FOR MONITORING A PROTECTIVE LADDER CONNECTION
CN104237744A (en) * 2014-10-16 2014-12-24 姚建凯 Current calculating method for low power consumption of fault indicator
CN104635031A (en) * 2015-02-06 2015-05-20 海盐凌云威电子有限公司 Voltage sensor for overhead line fault indicator based on equivalent charge
CN108267672A (en) * 2018-01-19 2018-07-10 山东钢铁集团日照有限公司 A kind of application method of overhead transmission line fault-indicating system
CN110554279A (en) * 2019-09-09 2019-12-10 南京南瑞继保工程技术有限公司 Device and method for detecting internal fault of control winding of magnetic control type controllable reactor
CN110703133A (en) * 2019-10-15 2020-01-17 北京科锐配电自动化股份有限公司 Outdoor signal source device

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