CN106291259B - A kind of method of active signal method singlephase earth fault indicator extraction characteristic signal - Google Patents

A kind of method of active signal method singlephase earth fault indicator extraction characteristic signal Download PDF

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Publication number
CN106291259B
CN106291259B CN201610929206.1A CN201610929206A CN106291259B CN 106291259 B CN106291259 B CN 106291259B CN 201610929206 A CN201610929206 A CN 201610929206A CN 106291259 B CN106291259 B CN 106291259B
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signal
extraction
singlephase earth
earth fault
current
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CN106291259A (en
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陈柯豪
王燕祥
宣磊
王致
沈国富
肖大林
周骏
郑建鸿
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Kunming Power Supply Bureau of Yunnan Power Grid Co Ltd
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Kunming Power Supply Bureau of Yunnan Power Grid Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Locating Faults (AREA)

Abstract

A kind of method of active signal method singlephase earth fault indicator extraction characteristic signal, fault detector in short-circuit loop carries out analog-to-digital conversion by the collected current signals of CT, and the CPU module as built in fault detector carries out algorithm operation and extracts characteristic signal, is judged whether there is by the presence of Injection Signal by frequency-response analysis.Beneficial effects of the present invention：The present invention has added the method that the line current of characteristic current carries out 2 extractions through the stack, realize the signal for being more easily detected signal source injection, it helps singlephase earth fault indicator to realize the judgement to singlephase earth fault, greatly reduces fault detector for the erroneous judgement of singlephase earth fault and fail to judge.Principle is simple, and positional accuracy is high, and cost is relatively low, easy to spread.

Description

A kind of method of active signal method singlephase earth fault indicator extraction characteristic signal
Technical field
The present invention relates to the route selection of distribution technique field more particularly to singlephase earth fault and localization methods.
Background technology
Singlephase earth fault is the most common failure of distribution system, is mostly occurred in moist, rainy weather.For power distribution network event Hinder location technology, academia and engineering circles are generally acknowledged that positions singlephase earth fault using the active signal injection method of signal source Technology is more reliable, has carried out a large amount of research.But due to power distribution network complicated and special topological structure and the method for operation, make The characteristic signal injected with traditional normal signal source is easily superimposed with fault current and load current, causes injection characteristic signal unknown It is aobvious, it is not easy to be arrived by singlephase earth fault pointer detection, it is easy to singlephase earth fault indicator be caused to judge by accident.This problem Fully effective solution is never obtained, and the signal for the signal source injection for using the features such as frequency variable is not easy with event very much Hinder electric current and load current superposition, it is easier to be detected, but to hanging fault detector detection signal extraction energy on the line More stringent requirements are proposed for power, and the present invention proposes a kind of effective fault-signal extracting method.
Invention content
The present invention proposes a kind of singlephase earth fault for using active injecting signal positioning singlephase earth fault Characteristic signal method is extracted used by indicator.The present invention is suitable for using power frequency and non-power frequency injecting signal indicating fault Device, for being positioned to the progress route selection of singlephase earth fault circuit and fault point.
The present invention is achieved by the following technical solution.
A kind of method of active signal method singlephase earth fault indicator extraction characteristic signal, the invention is characterised in that：When Singlephase earth fault occurs in distribution, after judging faulty line and failure phase, by the signal generation apparatus mounted on leading-out terminal To system Injection Signal, i.e., connect in short-term a certain non-faulting phase mutually constituted with earth fault two differently ground short circuit circuit it is (attached Shown in Fig. 1), and the fault detector in this short-circuit loop carries out analog-to-digital conversion by the collected current signals of CT, And CPU module carries out algorithm operation as built in fault detector, is judged whether there is by Injection Signal by frequency-response analysis In the presence of, then by built-in SIM card to substation send fault-signal to carry out fault location.
The present invention carries out singlephase earth fault positioning injection according to the fluctuation characteristic of Injection Signal feature and load current Signal extraction；Breakdown judge is carried out using feature signal extraction, the frequency characteristic that signal is obtained with extraction is to judge whether there is The existing Main Basiss of POWER SYSTEM DISTURBANCE SIGNALS carry out collected line current the complete cycle current subtraction of Different Rule twice Operation can effectively reduce load fluctuation reasons for its use current disturbing intensity, enhance fault location Injection Signal, i.e., effectively believe Number intensity.
Power disturbance characteristic signal extraction method of the present invention is：
Signal injection device will produce a current disturbing every a cycle on faulty line, such as 2 upper figure institute of attached drawing Show, the current disturbing signal being superimposed using singlephase earth fault pointer detection；Wherein period C1, C3, C5 contains electric current and disturbs It is dynamic；No current disturbs in period C2, C4, C6.
In attached drawing 2, figure below describes method for extracting signal process is, the complete cycle of ad hoc rules is all used per onestep extraction Subtractive method：
1. the 1st extraction：Current cycle number m is numbered into (m=1,2,3 ...), is that a signal carries with every 3 periods Section is taken, 3 period number m of signal extraction section N (N=1,2,3 ...) are+2 and 2 (N-1)+3 of 2 (N-1)+1,2 (N-1)；Extraction Signal instructions are：C2(N-1)+2-C2(N-1)+1, C2(N-1)+3-C2(N-1)+2；In this way, n disturbing signal of m periodicity extraction (n=m), often One cycle when a disturbing signal accounts for；
2. the 2nd extraction：The n disturbing signal that 1st time is extracted, does following Rule Extraction, i.e.,：Cn+1-Cn, obtain To the disturbing signal of (n-1) a enhancing.
Beneficial effects of the present invention：The present invention has added the line current of characteristic current to carry out 2 sides extracted through the stack Method realizes the signal for being more easily detected signal source injection, and singlephase earth fault indicator is helped to realize to single-phase earthing event The judgement of barrier greatly reduces fault detector for the erroneous judgement of singlephase earth fault and fails to judge.Principle is simple, positional accuracy Height, cost is relatively low, easy to spread.
The invention will be further described with reference to the accompanying drawings and examples：
Description of the drawings
Fig. 1 single-phase earth fault positioning device scheme of installation；
Fig. 2 single-phase earth fault positioning device operating diagrams；
Fig. 3 power disturbance characteristic signal extraction method figures.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples：
A kind of method of active signal method singlephase earth fault indicator extraction characteristic signal, the invention is characterised in that：When Singlephase earth fault occurs in distribution, after judging faulty line and failure phase, by the signal generation apparatus mounted on leading-out terminal To system Injection Signal, i.e., connect in short-term a certain non-faulting phase mutually constituted with earth fault two differently ground short circuit circuit it is (attached Shown in Fig. 1), and the fault detector in this short-circuit loop carries out analog-to-digital conversion by the collected current signals of CT, And CPU module carries out algorithm operation as built in fault detector, is judged whether there is by Injection Signal by frequency-response analysis In the presence of, then by built-in SIM card to substation send fault-signal to carry out fault location.
The present invention carries out singlephase earth fault positioning injection according to the fluctuation characteristic of Injection Signal feature and load current Signal extraction；The complete cycle current subtraction operation that Different Rule twice is carried out to collected line current, can effectively reduce negative Lotus fluctuates reasons for its use current disturbing intensity, enhances fault location Injection Signal, the i.e. intensity of useful signal.
Power disturbance characteristic signal extraction method of the present invention is：
Signal injection device will produce a current disturbing every a cycle on faulty line, such as 2 upper figure institute of attached drawing Show, the current disturbing signal being superimposed using singlephase earth fault pointer detection；Wherein period C1, C3, C5 contains electric current and disturbs It is dynamic；No current disturbs in period C2, C4, C6.
In attached drawing 2, figure below describes method for extracting signal process is, the complete cycle of ad hoc rules is all used per onestep extraction Subtractive method：
1. the 1st extraction：Current cycle number m is numbered into (m=1,2,3 ...), is that a signal carries with every 3 periods Section is taken, 3 period number m of signal extraction section N (N=1,2,3 ...) are+2 and 2 (N-1)+3 of 2 (N-1)+1,2 (N-1)；Extraction Signal instructions are：C2(N-1)+2-C2(N-1)+1, C2(N-1)+3-C2(N-1)+2；In this way, n disturbing signal of m periodicity extraction (n=m), often One cycle when a disturbing signal accounts for；
2. the 2nd extraction：The n disturbing signal that 1st time is extracted, does following Rule Extraction, i.e.,：Cn+1-Cn, obtain To the disturbing signal of (n-1) a enhancing.
In attached drawing 2 figure show the first step extraction current disturbing signal as a result, it is observed that apparent load fluctuation Reasons for its use current disturbing.
2 figure below of attached drawing show the result of first step extraction current disturbing signal, it is seen that by using " dual extraction is calculated Not only background perturbation signal caused by load fluctuation can be greatly lowered for method ", while can also believe useful current perturbation Number intensity enhancing.

Claims (3)

1. a kind of method of active signal method singlephase earth fault indicator extraction characteristic signal, it is characterised in that：
Fault detector in short-circuit loop carries out analog-to-digital conversion by the collected current signals of CT, and by fault detector It sets CPU module progress algorithm operation and extracts characteristic signal, judged whether there is by Injection Signal by frequency-response analysis In the presence of；
Singlephase earth fault positioning Injection Signal extraction is carried out according to the fluctuation characteristic of Injection Signal feature and load current；It is right Collected line current carries out the complete cycle current subtraction operation of Different Rule twice.
2. a kind of method of active signal method singlephase earth fault indicator extraction characteristic signal according to claim 1, It is characterized in that：Fault detector carries out breakdown judge using feature signal extraction, and the frequency characteristic of signal is obtained with extraction To judge whether there is the existing Main Basiss of POWER SYSTEM DISTURBANCE SIGNALS.
3. a kind of method of active signal method singlephase earth fault indicator extraction characteristic signal according to claim 1, It is characterized in that：Power disturbance characteristic signal extraction method is：
Signal injection device will produce a current disturbing every a cycle on faulty line, be referred to using singlephase earth fault Show that device detects the current disturbing signal being superimposed；
Method for extracting signal process is that the complete cycle subtractive method of ad hoc rules is all used per onestep extraction：
1. the 1st extraction：Current cycle number is numbered with m, with every 3 periods for a signal extraction section, signal extraction section N's 3 period number m are+2 and 2 (N-1)+3 of 2 (N-1)+1,2 (N-1)；Extracting signal instructions is：C2(N-1)+2-C2(N-1)+1, C2(N-1)+3-C2(N-1)+2；In this way, n disturbing signal of m periodicity extraction, one cycle when each disturbing signal accounts for；Wherein, m= 1,2,3,…；N=1,2,3 ...；N=m；C is the line electricity flow valuve of singlephase earth fault pointer detection；
2. the 2nd extraction：The n disturbing signal that 1st time is extracted, does following Rule Extraction, i.e.,：Cn+1-Cn, obtain n-1 The disturbing signal of a enhancing.
CN201610929206.1A 2016-10-31 2016-10-31 A kind of method of active signal method singlephase earth fault indicator extraction characteristic signal Active CN106291259B (en)

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CN109839567A (en) * 2017-11-28 2019-06-04 国网江西省电力有限公司抚州供电分公司 A kind of intelligence off-line type single-phase earth fault locating system and method
CN108022791A (en) * 2017-12-18 2018-05-11 云南电网有限责任公司电力科学研究院 A kind of high-voltage switch gear three-phase mechanical blocking device and normal signal source
CN109683061A (en) * 2019-01-29 2019-04-26 镇江赛尔尼柯自动化有限公司 A kind of network of ship system Intelligent fault locating method and device based on intercept signal
CN109884465B (en) * 2019-03-01 2023-09-29 辽宁工业大学 Unidirectional ground fault positioning method based on signal injection method

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RU2446533C1 (en) * 2010-08-02 2012-03-27 Государственное образовательное учреждение высшего профессионального образования "Казанский государственный энергетический университет" (КГЭУ) Method to detect area of single-phase ground fault in network with isolated neutral
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