CN107561406A - It is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method - Google Patents

It is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method Download PDF

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Publication number
CN107561406A
CN107561406A CN201710702937.7A CN201710702937A CN107561406A CN 107561406 A CN107561406 A CN 107561406A CN 201710702937 A CN201710702937 A CN 201710702937A CN 107561406 A CN107561406 A CN 107561406A
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China
Prior art keywords
zero
sequence current
comparator
fault
phase
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CN201710702937.7A
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Inventor
陈剑萍
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Hangzhou Linger Electric Power Technology Co Ltd
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Hangzhou Linger Electric Power Technology Co Ltd
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Priority to CN201710702937.7A priority Critical patent/CN107561406A/en
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Abstract

The invention discloses a kind of fast line selection method of power network neutral point isolated neutral system singlephase earth fault.By the zero-sequence current amplitude for contrasting a plurality of leading-out terminal of same bus; filter out the maximum circuit of zero-sequence current; zero-sequence current is more than some setting value; meet that the phase difference of residual voltage and zero-sequence current is negative simultaneously and meet a certain scope; when above-mentioned condition is set up, protection device output fault indication signal and outlet switch action signal.A kind of fast line selection method of power network neutral point isolated neutral system singlephase earth fault of the present invention, can be with fast positioning faulty line, it not only can greatly improve the automaticity of multi-thread Complicated Distribution Network, and the power off time for making user is greatly shortened, loss, has good social and economic benefit caused by smaller power failure.

Description

It is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method
Technical field
The present invention relates to a kind of power distribution network earthed system, especially a kind of list of 10kV power network neutral points isolated neutral system Phase ground fault line selecting method.
Background technology
Most of China's power distribution network is using system with non effectively earth ed neutral (isolated neutral or through arc blowout wire at this stage Circle ground connection), singlephase earth fault accounts for more than the 80% of total breakdown, when one-phase short-circuit current failure occurs, due to the earth Reactor, therefore short circuit current very little are not directly electrically connected or concatenated between neutral point, and protection device need not be stood Quarter action tripping operation, so as to improve the reliability of system operation.
But also earth-free just because of system neutral, faulty line and voltage x current amplitude, the phase on non-fault line Angle has no too big difference so that the generation position judgment of the failure becomes difficult.But with increasing for feeder line, capacitance current increases Greatly, long-play is easy for single-phase earthing and becomes multipoint earthing short circuit, and arc grounding can also cause the overvoltage of system, damage Equipment, the safe operation of system is destroyed, so faulty line and the position of fault must be found in time.In order to improve power supply reliability And the power failure influence that electric network fault is brought is reduced, power supply enterprise of various countries is all actively implementing distribution operation automatic technology, passes through Monitoring in real time, scents a hidden danger, avoids the generation of accident in time, and realizes the positioning of failure, isolation and non-fault line automatically Service restoration, reduce the fault outage time.The single-line to ground fault short trouble type maximum as odds, how Power distribution network timely and accurately finds the position that failure occurs after singlephase earth fault occurs, and non-faulting is simultaneously recovered in isolated fault region The normal power supply in region, it is an important purpose in the research of current power distribution network singlephase earth fault.
With the reinforcement of distribution network structure, branched line also increases, and system busbar typically has many leading-out terminals, with biography The position that the patrolling method of system finds out specific trouble point is extremely difficult.This not only consumes a large amount of manpower and materials, and extends Power off time, influence power supply reliability.It is especially difficult in weather severe cold winter or sleety weather, road conditions, it is existing to look for trouble point Method labor intensity it is very big, it is difficult to adapt to the demand that currently produces.
The content of the invention
The invention solves the shortcomings that above-mentioned prior art, there is provided a kind of output is stable, the 10kV power distribution networks of accuracy of judgement The selection method of the singlephase earth fault of isolated neutral system.
The present invention solves the technical scheme that its technical problem uses:The list of this 10kV power network neutral points isolated neutral system Phase ground fault line selecting method, by contrasting the zero-sequence current amplitude of a plurality of leading-out terminal of same bus, filter out zero-sequence current most Big circuit, zero-sequence current are more than some setting value, while meet that the phase difference of residual voltage and zero-sequence current is negative and meet certain One scope, when above-mentioned condition is set up, protection device output fault indication signal and outlet switch action signal, criterion tool Body setting is as follows:
(1) the amplitude of maximum zero sequence current meets formula
I0m>Ic
Meanwhile (2) the circuit residual voltage meets formula with zero-sequence current phase difference
K1<α<K2
Formula (1), (2) in,
I0m:The amplitude of the maximum zero sequence current filtered out;
Ic:The fault current threshold values of setting;
α:The residual voltage of maximum zero sequence current circuit and the phase angle of zero-sequence current;
K1, K2:Setting valve.
Preferably, 60 °<K1<80 °, 100 °<K1<120°。
Preferably, this method uses the structure of following procedure block diagram, using all different leading-out terminals on same bus Voltage, current value are output to by zero sequence pass filter as input and calculate zero-sequence current amplitude I0mLink, choose maximum zero sequence electricity The module of stream is chosen to obtain maximum zero sequence current I0mAnd corresponding line, maximum zero sequence current I0mWith definite value ICComparator 1 is input to, After the output end of comparator 1 is judged as 1, the residual voltage of selection circuit and phase difference α, the α input comparator 2 of zero-sequence current are calculated Negative input end and comparator 3 positive input terminal, the positive input terminal input definite value K of comparator 22, the negative input end of comparator 3 is defeated Enter definite value K1, comparator 2 and comparator 3 is input to and door, route selection result and action signal are exported with door.
Invention has the advantages that:Obtained signal is detected by the Current Voltage of all different leading-out terminals of same bus, Screening obtains the circuit of maximum zero sequence current, and by the screening of threshold value and the judgement of phase angle difference, output criterion is relatively stable, sentences Disconnected accuracy is higher.The technology that the present invention refers to, can be with fast positioning by the Relationship Comparison of same bus difference leading-out terminal Faulty line, it not only can greatly improve the automaticity of multi-thread Complicated Distribution Network, and the power off time that user will be made Greatly shorten, loss, has good social and economic benefit caused by smaller power failure.
Brief description of the drawings
Fig. 1 is the flow chart of selection method of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment:A kind of fault line selection method for single-phase-to-ground fault based on colony amplitude comparison phase comparing method, embodiment are, first First, the electric current of all leading-out terminals of same bus, control source to zero sequence pass filter, calculating is output to by zero sequence pass filter Zero-sequence current amplitude I0mLink, the module for choosing maximum zero sequence current are chosen to obtain maximum zero sequence current I0mAnd corresponding line, most Big zero-sequence current I0mWith definite value ICComparator 1 is input to, after the output end of comparator 1 is judged as 1, calculates the zero sequence electricity of selection circuit Pressure and the negative input end of phase difference α, α input comparator 2 and the positive input terminal of comparator 3 of zero-sequence current, comparator 2 it is just defeated Enter end input definite value K2=110 °, the negative input end input definite value K of comparator 31=70 °, comparator 2 and comparator 3 be input to Door, if the output of the phase difference α links of residual voltage and zero-sequence current is less than K2And it is more than K1, that is, meet K1<α<K2, then with door Two inputs be 1, export route selection result and action signal with door.
This method utilizes the zero-sequence current correlation of same bus difference leading-out terminal, and stability is good, can be accurately judged to Singlephase earth fault outlet.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape Into technical scheme, all fall within the protection domains of application claims.

Claims (3)

1. it is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method, it is characterized in that:By contrasting same bus The zero-sequence current amplitude of a plurality of leading-out terminal, the maximum circuit of zero-sequence current is filtered out, zero-sequence current is more than some setting value, together When meet that the phase difference of residual voltage and zero-sequence current is negative and meet a certain scope, when above-mentioned condition is set up, protection device exports Fault indication signal and outlet switch action signal, specifically setting is as follows for the criterion:
(1) the amplitude of maximum zero sequence current meets formula
I0m>Ic
Meanwhile (2) the circuit residual voltage meets formula with zero-sequence current phase difference
K1<α<K2
Formula (1), (2) in,
I0m:The amplitude of the maximum zero sequence current filtered out;
Ic:The fault current threshold values of setting;
α:The residual voltage of maximum zero sequence current circuit and the phase angle of zero-sequence current;
K1, K2:Setting valve.
2. it is according to claim 1 based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method, it is characterized in that: 60°<K1<80 °, 100 °<K1<120°。
3. according to claim 1,2 based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method, it is characterized in that: Using the structure of following procedure block diagram, the voltage of all different leading-out terminals, current value pass through zero sequence as input on same bus Pass filter, which is output to, calculates zero-sequence current amplitude I0mLink, the module for choosing maximum zero sequence current are chosen to obtain maximum zero sequence current I0mAnd corresponding line, maximum zero sequence current I0mWith definite value ICComparator 1 is input to, after the output end of comparator 1 is judged as 1, is calculated Select the residual voltage of circuit and the negative input end of phase difference α, α input comparator 2 and the positive input of comparator 3 of zero-sequence current End, the positive input terminal input definite value K of comparator 22, the negative input end input definite value K of comparator 31, comparator 2 and comparator 3 are defeated Enter to door, export route selection result and action signal with door.
CN201710702937.7A 2017-08-16 2017-08-16 It is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method Pending CN107561406A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108254650A (en) * 2018-04-16 2018-07-06 李景禄 A kind of quick distinguishing method of substation busbars singlephase earth fault
CN110261722A (en) * 2019-08-06 2019-09-20 云南电网有限责任公司电力科学研究院 A kind of single-phase earthing of isolated neutral system differentiates and sentences phase method

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CN101026295A (en) * 2006-12-21 2007-08-29 王小华 Non-grounding neutral point system low-voltage leakage protection method and its equipment
CN102253307A (en) * 2011-04-19 2011-11-23 中国电力科学研究院 Method for positioning single-phase grounding failure of distribution network containing distributed power supply
CN103364692A (en) * 2013-07-12 2013-10-23 桐乡市供电局 Single-phase earth fault line selection method of power distribution network earthing system
CN103760463A (en) * 2014-01-20 2014-04-30 国家电网公司 Low-current line selection method based on DTU
CN105116290A (en) * 2015-09-08 2015-12-02 华北电力大学(保定) Small-current grounding system single-phase grounding fault section locating method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101026295A (en) * 2006-12-21 2007-08-29 王小华 Non-grounding neutral point system low-voltage leakage protection method and its equipment
CN102253307A (en) * 2011-04-19 2011-11-23 中国电力科学研究院 Method for positioning single-phase grounding failure of distribution network containing distributed power supply
CN103364692A (en) * 2013-07-12 2013-10-23 桐乡市供电局 Single-phase earth fault line selection method of power distribution network earthing system
CN103364692B (en) * 2013-07-12 2016-03-23 国家电网公司 A kind of power distribution network single-phase grounded malfunction in grounded system selection method
CN103760463A (en) * 2014-01-20 2014-04-30 国家电网公司 Low-current line selection method based on DTU
CN105116290A (en) * 2015-09-08 2015-12-02 华北电力大学(保定) Small-current grounding system single-phase grounding fault section locating method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108254650A (en) * 2018-04-16 2018-07-06 李景禄 A kind of quick distinguishing method of substation busbars singlephase earth fault
CN108254650B (en) * 2018-04-16 2020-09-04 李景禄 Quick judgment method for single-phase earth fault of substation bus
CN110261722A (en) * 2019-08-06 2019-09-20 云南电网有限责任公司电力科学研究院 A kind of single-phase earthing of isolated neutral system differentiates and sentences phase method

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