CN106291259A - A kind of active signal method singlephase earth fault indicator extracts the method for characteristic signal - Google Patents

A kind of active signal method singlephase earth fault indicator extracts the method for characteristic signal Download PDF

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Publication number
CN106291259A
CN106291259A CN201610929206.1A CN201610929206A CN106291259A CN 106291259 A CN106291259 A CN 106291259A CN 201610929206 A CN201610929206 A CN 201610929206A CN 106291259 A CN106291259 A CN 106291259A
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China
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signal
singlephase earth
earth fault
current
characteristic
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CN201610929206.1A
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CN106291259B (en
Inventor
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 active signal method singlephase earth fault indicator extracts the method for characteristic signal, the current signal that fault detector in short-circuit loop is collected by CT carries out analog digital conversion, and by the built-in CPU module of fault detector carry out algorithm computing carry out extract characteristic signal, determine whether to be injected into the existence of 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 times extracting through the stack, achieve and be more easily detected the signal that signal source is injected, help singlephase earth fault indicator to realize the judgement to singlephase earth fault, greatly reduce fault detector and 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, it is easy to promote.

Description

A kind of active signal method singlephase earth fault indicator extracts the method for characteristic signal
Technical field
The present invention relates to distribution technique field, particularly relate to route selection and the localization method of singlephase earth fault.
Background technology
Singlephase earth fault is the modal fault of distribution system, mostly occurs at weather moist, rainy.For power distribution network event Barrier location technology, academia and engineering circles it is generally acknowledged the active signal injection method location singlephase earth fault using signal source Technology is more reliable, has carried out substantial amounts of research.But special topological structure and the method for operation due to power distribution network complexity, make With the characteristic signal of tradition normal signal source injection easily with fault current and load current superposition, injection characteristic signal is caused to fail to understand Aobvious, it is not easy to be arrived by singlephase earth fault pointer detection, it is easy to cause singlephase earth fault indicator to judge by accident.This problem Never obtain fully effective solution, and the signal that the signal source using the features such as frequency variable is injected is not easy with event very much Barrier electric current and load current superposition, it is easier to be detected, but to the fault detector detection signal extraction energy hung on the line Power is had higher requirement, and the present invention proposes a kind of effective fault-signal extracting method.
Summary of the invention
The present invention proposes a kind of for the singlephase earth fault using actively injecting signal location singlephase earth fault The extraction characteristic signal method that indicator is used.The present invention is applicable for use with power frequency and non-power frequency injecting signal indicating fault Device, is used for that singlephase earth fault circuit is carried out route selection and trouble point positions.
The present invention is achieved by the following technical solution.
A kind of active signal method singlephase earth fault indicator extracts the method for characteristic signal, present invention is characterized in that and works as Distribution occurs singlephase earth fault, it is judged that after faulty line and fault phase, by the signal generation apparatus being arranged on leading-out terminal To system Injection Signal, connect the most in short-term a certain healthy phases constitute mutually with earth fault two differently ground short circuit loop (attached Shown in Fig. 1), and the fault detector in this short-circuit loop carries out analog digital conversion by the current signal that CT collects, And carried out algorithm computing by the built-in CPU module of fault detector, determine whether to be injected into signal by frequency-response analysis Exist, then to transformer station's transmission fault-signal thus carry out fault location by built-in SIM.
The present invention carries out singlephase earth fault location according to the fluctuation characteristic of Injection Signal feature and load current and injects Signal extraction；Feature signal extraction is used to carry out breakdown judge, to extract the frequency characteristic obtaining signal for determining whether The Main Basis of the existence of POWER SYSTEM DISTURBANCE SIGNALS, carries out the complete cycle current subtraction of twice Different Rule to the line current collected Computing, can effectively reduce load fluctuation reasons for its use current disturbing intensity, strengthens fault location Injection Signal, the most effectively believes Number intensity.
Power disturbance characteristic signal extraction method of the present invention is:
Signal injection device can produce a current disturbing, figure institute as upper in accompanying drawing 2 every a cycle on faulty line Show, use the current disturbing signal of singlephase earth fault pointer detection superposition；Wherein cycle C1, C3, C5 contains electric current and disturbs Dynamic；No current disturbance in cycle C2, C4, C6.
In accompanying drawing 2, figure below describe method for extracting signal process and be, every onestep extraction all uses the complete cycle of ad hoc rule Subtractive method:
1. extract for the 1st time: current cycle number m is numbered (m=1,2,3 ...), it is that a signal carries with every 3 cycles The section of taking, signal extraction section N (N=1,2,3 ...) and 3 cycle numberings m be 2 (N-1)+1,2 (N-1)+2 and 2 (N-1)+3；Extract Signal instructions is: C2(N-1)+2-C2(N-1)+1, C2(N-1)+3-C2(N-1)+2；So, m periodicity extraction n disturbing signal (n=m), often One cycle when individual disturbing signal accounts for；
2. extract for the 2nd time: n the disturbing signal that the 1st time is extracted, do following Rule Extraction, it may be assumed that Cn+1-Cn, Disturbing signal to (n-1) individual enhancing.
Beneficial effects of the present invention: the present invention has added the side that the line current of characteristic current carries out 2 times and extracts through the stack Method, it is achieved that be more easily detected the signal that signal source is injected, helps singlephase earth fault indicator to realize single-phase earthing event The judgement of barrier, greatly reduces fault detector and for the erroneous judgement of singlephase earth fault and fails to judge.Principle is simple, positional accuracy Height, cost is relatively low, it is easy to promote.
The invention will be further described with embodiment below in conjunction with the accompanying drawings:
Accompanying drawing explanation
Fig. 1 single-phase earth fault positioning device scheme of installation；
Fig. 2 single-phase earth fault positioning device operating diagram；
Fig. 3 power disturbance characteristic signal extraction method figure.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings:
A kind of active signal method singlephase earth fault indicator extracts the method for characteristic signal, present invention is characterized in that and works as Distribution occurs singlephase earth fault, it is judged that after faulty line and fault phase, by the signal generation apparatus being arranged on leading-out terminal To system Injection Signal, connect the most in short-term a certain healthy phases constitute mutually with earth fault two differently ground short circuit loop (attached Shown in Fig. 1), and the fault detector in this short-circuit loop carries out analog digital conversion by the current signal that CT collects, And carried out algorithm computing by the built-in CPU module of fault detector, determine whether to be injected into signal by frequency-response analysis Exist, then to transformer station's transmission fault-signal thus carry out fault location by built-in SIM.
The present invention carries out singlephase earth fault location according to the fluctuation characteristic of Injection Signal feature and load current and injects Signal extraction；The line current collected is carried out the complete cycle current subtraction computing of twice Different Rule, can effectively reduce negative Lotus fluctuation reasons for its use current disturbing intensity, strengthens the intensity of fault location Injection Signal, i.e. useful signal.
Power disturbance characteristic signal extraction method of the present invention is:
Signal injection device can produce a current disturbing, figure institute as upper in accompanying drawing 2 every a cycle on faulty line Show, use the current disturbing signal of singlephase earth fault pointer detection superposition；Wherein cycle C1, C3, C5 contains electric current and disturbs Dynamic；No current disturbance in cycle C2, C4, C6.
In accompanying drawing 2, figure below describe method for extracting signal process and be, every onestep extraction all uses the complete cycle of ad hoc rule Subtractive method:
1. extract for the 1st time: current cycle number m is numbered (m=1,2,3 ...), it is that a signal carries with every 3 cycles The section of taking, signal extraction section N (N=1,2,3 ...) and 3 cycle numberings m be 2 (N-1)+1,2 (N-1)+2 and 2 (N-1)+3；Extract Signal instructions is: C2(N-1)+2-C2(N-1)+1, C2(N-1)+3-C2(N-1)+2；So, m periodicity extraction n disturbing signal (n=m), often One cycle when individual disturbing signal accounts for；
2. extract for the 2nd time: n the disturbing signal that the 1st time is extracted, do following Rule Extraction, it may be assumed that Cn+1-Cn, Disturbing signal to (n-1) individual enhancing.
In accompanying drawing 2 figure show the first step extract current disturbing signal as a result, it is possible to observe obvious load fluctuation Reasons for its use current disturbing.
Accompanying drawing 2 figure below show the first step and extracts the result of current disturbing signal, it is seen that by using, " dual extraction is calculated Method ", the background perturbation signal being possible not only to cause load fluctuation is greatly lowered, simultaneously can also be by useful current perturbation letter Number intensity enhancing.

Claims (4)

1. the method that an active signal method singlephase earth fault indicator extracts characteristic signal, it is characterised in that:
Fault detector in short-circuit loop carries out analog digital conversion by the current signal that CT collects, and by fault detector Put CPU module carry out algorithm computing carry out extract characteristic signal, determine whether to be injected into signal by frequency-response analysis Exist.
A kind of active signal method singlephase earth fault indicator the most according to claim 1 extracts the method for characteristic signal, It is characterized in that: fault detector uses feature signal extraction to carry out breakdown judge, obtains the frequency characteristic of signal with extraction For determining whether the Main Basis of the existence of POWER SYSTEM DISTURBANCE SIGNALS.
A kind of active signal method singlephase earth fault indicator the most according to claim 1 extracts the method for characteristic signal, It is characterized in that: carry out singlephase earth fault location Injection Signal according to the fluctuation characteristic of Injection Signal feature and load current Extract；The line current collected is carried out the complete cycle current subtraction computing of twice Different Rule.
4. the method extracting characteristic signal according to claim 1 active signal method singlephase earth fault indicator, its feature It is: power disturbance characteristic signal extraction method is:
Signal injection device can produce a current disturbing every a cycle on faulty line, uses singlephase earth fault to refer to Show the current disturbing signal of device detection superposition；
Method for extracting signal process is, every onestep extraction all uses the complete cycle subtractive method of ad hoc rule:
1. extract for the 1st time: current cycle number m is numbered (m=1,2,3 ...), it is a signal extraction section with every 3 cycles, Signal extraction section N (N=1,2,3 ...) and 3 cycle numberings m be 2 (N-1)+1,2 (N-1)+2 and 2 (N-1)+3；Extract signal Rule is: C2(N-1)+2-C2(N-1)+1, C2(N-1)+3-C2(N-1)+2；So, m periodicity extraction n disturbing signal (n=m), each disturb One cycle when dynamic signal accounts for；
2. extract for the 2nd time: n the disturbing signal that the 1st time is extracted, do following Rule Extraction, it may be assumed that Cn+1-Cn, obtain (n- 1) disturbing signal of individual 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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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
CN109884465A (en) * 2019-03-01 2019-06-14 辽宁工业大学 A kind of one-way earth fault localization method based on signal injection method

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CN104991162A (en) * 2015-06-21 2015-10-21 云南电力试验研究院(集团)有限公司 Positioning device of small-current grounding system single-phase grounding fault and usage method
CN105093061A (en) * 2015-06-11 2015-11-25 江苏安方电力科技有限公司 Power distribution network line fault on-line monitoring and alarming system
CN105510769A (en) * 2015-11-27 2016-04-20 国家电网公司 Power distribution network single-phase ground fault indicator

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CN1912642A (en) * 2006-07-28 2007-02-14 徐文远 Single-phase ground wire selecting equipment and method of neutral-point uneffect earthed system
US20090243623A1 (en) * 2008-03-31 2009-10-01 Jones Christopher G System and method for determining a position of a single phase fault to ground in a feeder line
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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* Cited by examiner, † Cited by third party
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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
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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
CN109884465A (en) * 2019-03-01 2019-06-14 辽宁工业大学 A kind of one-way earth fault localization method based on signal injection method
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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