CN107394757A - Fault-free recognition methods before a kind of power distribution network phase-to phase fault overlaps - Google Patents
Fault-free recognition methods before a kind of power distribution network phase-to phase fault overlaps Download PDFInfo
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- CN107394757A CN107394757A CN201710824220.XA CN201710824220A CN107394757A CN 107394757 A CN107394757 A CN 107394757A CN 201710824220 A CN201710824220 A CN 201710824220A CN 107394757 A CN107394757 A CN 107394757A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses fault-free recognition methods before a kind of power distribution network phase-to phase fault overlaps：The three-phase voltage instantaneous sampling value u of collection circuit circuit parallel capacitor between failure extremely overlaps and extremely overlaps early stage after collection distribution network line breaks down between early stageφ(k), circuit top phase current iφ_l(k), shunt capacitor phase current iφ_c(k) phase voltage difference u, is calculatedφφ(k), circuit phase current iφ(k), phase differential current iφφ(k) first-order difference value di and its is simultaneously calculatedφφ(k), wherein φ=A, B, C；Utilize phase voltage difference uφφAnd phase differential current i (k)φφ(k) equation u is identifiedφφ(k)=Rf.Aφφ1(k)+p.Aφφ2(k) fault loop substitutional resistance R is calculatedfWith fault distance p parameters, data window is then sequentially elapsed, obtains the sequence of identified parametersFault-free identical criterion before being overlapped using phase-to phase faultMalfunction identification is carried out, when criterion is persistently set up, is then judged to alternate transient fault and failure blow-out, reclosing multiple action；It is lasting to judge to differentiate that the time reaches up to maximum if criterion is invalid, permanent fault is now judged to, reclosing is misaligned.The present invention effectively improves the success rate of alternate coincidence.
Description
Technical field
The present invention relates to system for distribution network of power relay protection field, more particularly to a kind of distribution line phase-to phase fault weight
Fault-free recognition methods before conjunction.
Background technology
It is most in the short trouble (including single-line to ground fault in small current neutral grounding system) of China's power distribution network
(70%~90%) is transient fault, can eliminate power distribution network overwhelming majority transient fault using automatic reclosing so as to carry
Distribution network reliability during high phase-to phase fault.But fault electric arc during for part transient fault (arc resistance failure) due to overlapping
Unsuccessful reclosing will be caused by not extinguishing.Therefore, the identification of unfaulty conditions avoids coinciding with substantive permanent fault before being overlapped
It is significant for distribution network line reclosing successful reclosing rate.
China's power system is influenceed by " weight Generation Side, light confession/distribution side " idea for a long time, and distribution protection scheme is often
Simply emphasize to ensure power network safety in itself and simplify relaying configuration, generally only need substation exit side and load end side
Configure three-step charging and use single reclosing mode.During Distribution Network Frame abortive haul network phase-to phase fault, protection act tripping operation,
Closed a floodgate again through constant time lag, transient fault disappears when closing a floodgate and closing success continues to power if insulation recovery is normal；It is another
Aspect is closed a floodgate in second short circuit when closing a floodgate if trouble point does not disappear, trips no longer overlap again, especially once outlet is protected
Tripping again means that whole piece occurs or branch line all has a power failure, and power failure range is big and the time that restores electricity is grown.Power distribution network at present
Phase-to phase fault using arc resistance failure as principal mode, using definite-time coincidence system, on the one hand to directly result in blow-out slow
Arc resistance failure reclosing failure, with coinciding with the similar of permanent fault, to system second short circuit will be brought to impact；On the other hand it is right
In the quick arc resistance failure of blow-out, then the open-phase operation time will be extended, equivalent to artificially extending power off time.
The content of the invention
Fault-free recognition methods before being overlapped it is an object of the invention to provide one kind using power distribution network phase-to phase fault, to solve
Above-mentioned technical problem.The present invention utilizes terminal voltage, electric current and the circuit top current information of power distribution network parallel capacitor
The calculating of electric arc substitutional resistance during progress phase-to phase fault, realized using the amplitude and variation characteristic of arc resistance to alternate electric arc
Failure and the seizure at blow-out moment, to realize that power distribution network phase-to phase fault property identification provides good thinking.It is of the invention abundant
The temporal signatures of the voltage of parallel capacitor, electric current after being tripped using power distribution network phase-to phase fault three-phase, establish failure phase and return
Road on arc resistance and the identification equation of abort situation, carried out according to the amplitude of the arc resistance of calculating and rate of change feature
Nature of trouble identifies, the alternate arc resistance failure of one side reliable recognition, on the other hand accurately captures transient fault blow-out
Moment, and then the reliable recognition of unfaulty conditions before alternate coincidence is realized, to realize the adaptive reclosing technology of phase-to phase fault
Important evidence is provided.
In order to achieve the above object, the present invention is achieved using following technical scheme：
Fault-free recognition methods before a kind of power distribution network phase-to phase fault overlaps, comprises the following steps：
(1) collection distribution network line break down after to overlap early stage between circuit parallel capacitor three-phase voltage wink
When sampled value uφ(k), circuit top three-phase current iφ_l(k), shunt capacitor group three-phase current iφ_c(k) it is poor, to calculate phase voltage
uφφ(k), circuit phase current iφ(k)=[iφ_l(k)-iφ_c(k)], phase differential current iφφAnd its first-order difference di (k)φφ(k)=
[iφφ(k)-iφφ(k-1)]/Ts；Wherein φ=A, B, C, TsFor the sampling period；
(2) phase voltage difference u is utilizedφφAnd phase differential current i (k)φφ(k) construction is on fault loop substitutional resistance RfAnd failure
Distance p parameters identification equation uφφ(k)=Rf.Aφφ1(k)+p.Aφφ2(k), wherein Aφφ1(k)、Aφφ2(k) it is by iφφ(k)、
diφφAnd circuit impedance R (k)l, inductance LlIt is determined that establishing redundant equation group with 5ms data redundancy data window calculates failure
Loop substitutional resistance RfWith fault distance p, data window is then sequentially elapsed, obtains the sequence of identified parameters
(3) fault-free identical criterion before being overlapped using phase-to phase faultMalfunction examination is carried out, when criterion is held
It is continuous when setting up, then it is judged to alternate transient fault and failure blow-out, reclosing multiple action；If criterion is invalid,
It is lasting to judge to differentiate that the time reaches up to maximum, permanent fault is now judged to, reclosing is misaligned；
Wherein,M is result of calculation sequence length；RsetTo adjust threshold.
Further, m takes 10~20.
Further, RsetTake the Ω of 50 Ω~100.
Further, Aφφ1(k)=0.5iφφ(k), Aφφ2(k)=[Rl.iφφ(k)+Ll.diφφ(k)]。
The present invention proposes that a kind of power distribution network phase-to phase fault overlaps fault-free method of discrimination, makes full use of fault electric arc to coincidence
The fault signature of period, the identical criterion using electric arc loop substitutional resistance feature is constructed, improve the alternate event of existing power distribution network
Hinder the adaptive ability of reclosing, further improve the success rate of alternate coincidence.
Compared with prior art, there is following remarkable advantage：
(1) fault characteristic information to before overlapping after power distribution network phase-to phase fault is made full use of.
(2) this method use can carry out effective identification of the malfunction before power distribution network phase-to phase fault coincidence, be advantageous to
Improve the success rate overlapped.
Brief description of the drawings
Fig. 1 is power distribution network BC phase-to phase fault equivalent networks；
Fault-free identification process figure before being overlapped when Fig. 2 is power distribution network phase-to phase fault；
Embodiment
Refer to shown in Fig. 1 to Fig. 2, fault-free recognition methods before a kind of power distribution network phase-to phase fault of the present invention overlaps, including
Following steps：
(1) collection of three-phase electrical quantity and the calculating of characteristic quantity
Power distribution network bus bar side voltage transformer secondary side voltage in Fig. 1 is by LPF, sampling holding processing, collection
Distribution network line extremely overlaps the three-phase voltage instantaneous value u of circuit parallel capacitor between early stage after breaking downφ(k)(uA
(k)、uB(k)、uC(k)), three-phase line top electric current iφ_l(k)(iA_l(k)、iB_l(k)、iC_l(k)), three phase parallel capacitor
Phase current iφ_c(k)(iA_c(k)、iB_c(k)、iC_c(k) phase voltage difference u), is calculatedφφ(k)(uAB(k)=uA(k)-uB(k)、uBC
(k)=uB(k)-uC(k)、uCA(k)=uC(k)-uA(k)), phase current residual quantity iφφ(k)(iAB(k)=[iA_l(k)-iA_c(k)]-
[iB_l(k)-iB_c(k)]、iBC(k)=[iB_l(k)-iB_c(k)]-[iC_l(k)-iC_c(k)]、iCA(k)=[iC_l(k)-iA_c
(k)]-[iA_l(k)-iA_c(k)]).Wherein φ=A, B, C.The first-order difference di of three-phase spill current is calculated simultaneouslyφφ(k)=[iφφ
(k)-iφφ(k-1)]/Ts(diAB(k)=[iAB(k)-iAB(k-1)]/Ts, diBC(k)=[iBC(k)-iBC(k-1)]/Ts、diCA
(k)=[iCA(k)-iCA(k-1)]/Ts).In formula, TsFor the sampling period.
(2) fault loop substitutional resistance RfWith the identification of fault distance p parameters
According to fault loop substitutional resistance R under phase voltage difference and phase differential current construction continued time domainfWith fault distance p parameters
Identification equation：
The parameter linear identification equation group u established under its discrete sample signalsφφ(k)=Rf.Aφφ1(k)+p.Aφφ2(k)
(φ=A, B, C),
Aφφ1(k)、Aφφ2(k) it is by iφφ(k)、diφφAnd circuit impedance R (k)l, inductance LlIt is determined that：Aφφ1(k)=
0.5iφφ(k), Aφφ2(k)=[Rl.iφφ(k)+Ll.diφφ(k)]。
Redundant equation group is established using the redundant data window under 5ms sample variance data and calculates fault loop substitutional resistance
RfWith fault distance p, i.e., an estimates of parameters is drawn with the sampled value of a period of time, that is, be described as shaped like [Rf,p].[Aφφ1,
Aφφ2]T=[uφφ] redundant equation,
Then data window is sequentially elapsed, obtains the sequence of identified parameters
Formula (2), k0To calculate data starting point, N is power frequency period sampling number.
Illustrated by taking the power distribution network BC phase-to phase faults shown in Fig. 2 as an example.Failure under its corresponding continued time domain mutually holds electricity
Relation is as follows between pressure, electric current
uB(t)=p.Rl.iB(t)+p.Ll.diB(t)/dt+ukB(t) (3)
uC(t)=p.Rl.iC(t)+p.Ll.diC(t)/dt+ukC(t) (4)
In formula (3), formula (4), ukB(t)、ukB(t) it is respectively B phases, C phase faults point voltage.
(3), (4) Shi Ke get more than：
ukBC(t)=ukB(t)-ukC(t)
=[uB(t)-uC(t)]-[p.Rl.(iB(t)-iC(t))+p.Ll.(diB(t)/dt-diC(t)/dt)] (5)
=uBC(t)-p.Rl.iBC(t)-p.Ll.diBC(t)/dt
ukBC(t)=ukB(t)-ukC(t)=Rf.iB(t)=0.5Rf.iBC(t) (6)
In formula (5), ukBC(t) it is poor for phase-to phase fault loop voltage.
It can be obtained by formula (5), (6)
uBC(t)-p.Rl.iBC(t)-p.Ll.diBC(t)/dt=0.5Rf.iBC(t) (7)
Arrange to obtain formula (8)
uBC(t)=p.Rl.iBC(t)+p.Ll.diBC(t)/dt+0.5Rf.iBC(t)
=Rf.[0.5iBC(t)]+p.[Rl.iBC(t)+Ll.diBC(t)/dt] (8)
=Rf.ABC1(t)+p.ABC2(t)
The parameter identification equation shown in shaped like formula (1) is just can obtain using corresponding discrete sample signals, establishes phase afterwards
The redundant equation answered calculates the sequence of identified parameters
(3) fault-free identifies before phase-to phase fault overlaps
In arcing phase, its fault electric arc loop substitutional resistance has nonlinearity feature, and most electric arcs can
It is instantaneous to extinguish；And substantive permanent fault (as broken) is approximately a stationary value in its transition resistance, feature can realize electricity accordingly
The differentiation of arc transient fault and substantive permanent fault.In addition, arc resistance failure is after arc extinction, equivalent to through infinite serious offense
The permanent fault of resistance is crossed, it calculates transition resistance value and arcing phase calculated value significant difference, utilizes fault electric arc loop etc.
Value resistance calculations value can also realize property judgment.
Upper feature construction barrier identical criterion according to thisMalfunction examination is carried out, wherein
M is result of calculation sequence length, can use 10~20；RsetTo adjust threshold, can adjust as 50~100 Ω.When criterion is persistently set up
When, then it is judged to alternate transient fault and failure blow-out, reclosing multiple action；If criterion is invalid, persistently sentence
It is disconnected to differentiate that the time reaches up to maximum, permanent fault is now judged to, reclosing is misaligned.This is combined in addition, can also utilize
The result of calculation of abort situation in method carries out the confirmation that position occurs for distribution network failure.
Fault-free recognition methods before power distribution network phase-to phase fault proposed by the present invention overlaps, first with circuit top electric current,
The voltage and electric current temporal signatures of shunt capacitor group, the identification of fault loop substitutional resistance is carried out, utilizes distinguishing for substitutional resistance
Know the identification that result carries out phase-to phase fault state, important evidence is provided to implement the coincidence of phase-to phase fault fault-free.This method has
There is the advantages that simple possible, amount of calculation is small, suitable for fault-free before the phase-to phase fault coincidence of the power distribution network with shunt capacitor group
Identification.
Claims (4)
- Fault-free recognition methods before 1. a kind of power distribution network phase-to phase fault overlaps, it is characterised in that comprise the following steps：(1) three-phase voltage of circuit parallel capacitor is instantaneously adopted between overlapping early stage after collection distribution network line breaks down Sample value uφ(k), circuit top three-phase current iφ_l(k), shunt capacitor group three-phase current iφ_c(k) phase voltage difference u, is calculatedφφ (k), circuit phase current iφ(k)=[iφ_l(k)-iφ_c(k)], phase differential current iφφAnd its first-order difference di (k)φφ(k)=[iφφ (k)-iφφ(k-1)]/Ts；Wherein φ=A, B, C, TsFor the sampling period；(2) phase voltage difference u is utilizedφφAnd phase differential current i (k)φφ(k) construction is on fault loop substitutional resistance RfWith fault distance p Parameter identification equation uφφ(k)=Rf.Aφφ1(k)+p.Aφφ2(k), wherein Aφφ1(k)、Aφφ2(k) by iφφ(k)、diφφ(k) with And circuit impedance Rl, inductance LlIt is determined that establishing redundant equation group with 5ms data redundancy data window calculates fault loop equivalence Resistance RfWith fault distance p, data window is then sequentially elapsed, obtains the sequence of identified parameters(3) fault-free identical criterion before being overlapped using phase-to phase faultCarry out malfunction examination, when criterion continue into Immediately, then it is judged to alternate transient fault and failure blow-out, reclosing multiple action；If criterion is invalid, continue Judge until maximum differentiation time arrival, is now judged to permanent fault, reclosing is misaligned；Wherein,M is result of calculation sequence length；RsetTo adjust threshold.
- Fault-free recognition methods before 2. a kind of power distribution network phase-to phase fault according to claim 1 overlaps, it is characterised in that m Take 10~20.
- Fault-free recognition methods before 3. a kind of power distribution network phase-to phase fault according to claim 1 overlaps, it is characterised in that RsetTake the Ω of 50 Ω~100.
- Fault-free recognition methods before 4. a kind of power distribution network phase-to phase fault according to claim 1 overlaps, it is characterised in that Aφφ1(k)=0.5iφφ(k), Aφφ2(k)=[Rl.iφφ(k)+Ll.diφφ(k)]。
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899864A (en) * | 2018-06-21 | 2018-11-27 | 许继电气股份有限公司 | The adaptive reclosing method of distribution line and nature of trouble recognition methods |
| CN111157844A (en) * | 2020-01-06 | 2020-05-15 | 许昌许继软件技术有限公司 | Distribution line self-adaptive reclosing method and fault property identification method and device |
| CN112332385A (en) * | 2020-10-28 | 2021-02-05 | 西安工程大学 | Detection type permanent fault discrimination method before inter-phase coincidence of power distribution network |
| CN112909901A (en) * | 2021-01-25 | 2021-06-04 | 南京国电南自电网自动化有限公司 | Power distribution network line adaptive reclosing method and storage medium |
| CN114280499A (en) * | 2021-12-21 | 2022-04-05 | 国能榆林能源有限责任公司 | Electric leakage detection method for coal mine underground power supply system and coal mine underground power supply system |
| CN117239670A (en) * | 2023-11-14 | 2023-12-15 | 昆明理工大学 | Single-phase self-adaptive reclosing method and system for wind power alternating current outgoing line |
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| CN101316036A (en) * | 2008-07-16 | 2008-12-03 | 天津大学 | Self-adapting three-phase reclosure decision method of ultra-high voltage electric power line with shunt reactor |
| CN101860000A (en) * | 2010-05-14 | 2010-10-13 | 河南电力试验研究院 | Quick identification method for permanent fault before single-phase reclosing of power transmission line |
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| KR20010016899A (en) * | 1999-08-05 | 2001-03-05 | 정기호 | Digital auto reclosing relay |
| CN101316036A (en) * | 2008-07-16 | 2008-12-03 | 天津大学 | Self-adapting three-phase reclosure decision method of ultra-high voltage electric power line with shunt reactor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899864A (en) * | 2018-06-21 | 2018-11-27 | 许继电气股份有限公司 | The adaptive reclosing method of distribution line and nature of trouble recognition methods |
| CN108899864B (en) * | 2018-06-21 | 2019-07-30 | 许继电气股份有限公司 | The adaptive reclosing method of distribution line and nature of trouble recognition methods |
| CN111157844A (en) * | 2020-01-06 | 2020-05-15 | 许昌许继软件技术有限公司 | Distribution line self-adaptive reclosing method and fault property identification method and device |
| CN112332385A (en) * | 2020-10-28 | 2021-02-05 | 西安工程大学 | Detection type permanent fault discrimination method before inter-phase coincidence of power distribution network |
| CN112332385B (en) * | 2020-10-28 | 2022-07-12 | 西安工程大学 | Detection type permanent fault discrimination method before inter-phase coincidence of power distribution network |
| CN112909901A (en) * | 2021-01-25 | 2021-06-04 | 南京国电南自电网自动化有限公司 | Power distribution network line adaptive reclosing method and storage medium |
| CN114280499A (en) * | 2021-12-21 | 2022-04-05 | 国能榆林能源有限责任公司 | Electric leakage detection method for coal mine underground power supply system and coal mine underground power supply system |
| CN117239670A (en) * | 2023-11-14 | 2023-12-15 | 昆明理工大学 | Single-phase self-adaptive reclosing method and system for wind power alternating current outgoing line |
| CN117239670B (en) * | 2023-11-14 | 2024-01-26 | 昆明理工大学 | Single-phase self-adaptive reclosing method and system for wind power alternating current outgoing line |
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