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 PDFInfo
- 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
- Authority
- CN
- China
- Prior art keywords
- sequence current
- zero
- comparator
- fault
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
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 ⑴
Meanwhile (2) the circuit residual voltage meets formula with zero-sequence current phase difference
K1<α<K2 ⑵
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 ⑴
Meanwhile (2) the circuit residual voltage meets formula with zero-sequence current phase difference
K1<α<K2 ⑵
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710702937.7A CN107561406A (en) | 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710702937.7A CN107561406A (en) | 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107561406A true CN107561406A (en) | 2018-01-09 |
Family
ID=60974085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710702937.7A Pending CN107561406A (en) | 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107561406A (en) |
Cited By (2)
| 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 |
Citations (5)
| 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 |
| 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 |
-
2017
- 2017-08-16 CN CN201710702937.7A patent/CN107561406A/en active Pending
Patent Citations (6)
| 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)
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103364692B (en) | A kind of power distribution network single-phase grounded malfunction in grounded system selection method | |
| CN102621451B (en) | Based on the distribution circuit single-phase earth fault detection method of momentary signal method | |
| CN102937687B (en) | Method for distinguishing disconnection fault and grounding fault during grounding of neutral point through small resistor | |
| CN103022992A (en) | Feeder ground positioning method based on dispersion zero sequence voltage detection | |
| CN105591609B (en) | PID processing method and system of photovoltaic system | |
| CN107561408B (en) | Method for improving accuracy rate of small current ground fault line selection | |
| CN103364684B (en) | Fault line selection method based on wavelet analysis | |
| CN105629128A (en) | Device and searching method for searching power grid undercurrent single-phase earth fault | |
| CN101505053A (en) | User demarcation circuit breaker set apparatus and protection method | |
| CN104836330A (en) | Method for quickly detecting bus PT three-phase disconnection of automatic switching device of standby power supply and method for preventing maloperation of bus PT three-phase disconnection of automatic switching device of standby power supply | |
| CN204422692U (en) | A kind of small current grounding failure wire selection system | |
| CN110794340B (en) | Disconnection protection method and circuit for high-voltage overhead line | |
| CN202586308U (en) | Comprehensive grounding protective device for microcomputer | |
| CN103487707B (en) | Vehicle-mounted three-phase alternating-current powered intelligent monitoring unit | |
| CN103149493B (en) | Electric transmission line one-phase grounding fault type diagnostic method | |
| CN107561406A (en) | 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 | |
| CN203690905U (en) | Insulation monitoring system for grounding photovoltaic power generation system | |
| CN107367670A (en) | A kind of fault line selection method for single-phase-to-ground fault based on quintuple harmonics electric current | |
| CN111880110B (en) | Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system | |
| CN203166469U (en) | Phase sequence protective relay | |
| CN203135401U (en) | AC invasion protection device for DC system of transformer substation | |
| CN203301223U (en) | Rapid power supply switching device | |
| CN211017777U (en) | Arc and harmonic elimination device | |
| CN204068225U (en) | Intelligent distribution network self-healing control system | |
| CN103558451B (en) | Double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180109 |
|
| WD01 | Invention patent application deemed withdrawn after publication |