CN105207176B - A kind of line protection method - Google Patents
A kind of line protection method Download PDFInfo
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- CN105207176B CN105207176B CN201510505535.9A CN201510505535A CN105207176B CN 105207176 B CN105207176 B CN 105207176B CN 201510505535 A CN201510505535 A CN 201510505535A CN 105207176 B CN105207176 B CN 105207176B
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Abstract
The invention provides a kind of line protection method, method comprises the following steps：(1) three-phase current and voltage I of circuit are installed in collection protectionA,IB,IC, and UA,UB,UC, calculate the electric current and voltage of positive sequence, negative phase-sequence and zero sequence, respectively Iμ1,Iμ2,Iμ0, and Uμ1,Uμ2,Uμ0, μ values are A, B, C；CalculateWith current asymmetry degree m, wherein For line impedance angle；(2) according to p1,Fault type is determined with the triangular relations of p2：Wherein：0.3≤p1≤0.1,0.5≤p2≤0.6；In the case of recognizing various overloads, circuit overload, reliable locking distance protection; in the case of failure, the resistance to transition resistance ability of distance protection in route protection greatly improved in open distance protection; overload, without manually adjusting, is realized with Fault Identification algorithm by device inside；Suitable for 220kV and above transmission line of electricity, distance protection overload mis-operation can be effectively solved, the expansion of accident scope is limited.
Description
Technical field
The invention belongs to relay protection field, and in particular to a kind of line protection method.
Background technology
In large area blackout, distance protection excess load influence misoperation tripping non-fault line causes load to turn
Shifting causes non-fault line cascade tripping, expands accident scope, influences the safe and stable operation of power network.
Load restraining line definite value is set in current route protection, it is necessary to operations staff is adjusted, but the definite value according to
Possible peak load is adjusted in circuit running, influences the performance of distance protection, limits its resistance to transition electricity
Resistance ability, i.e., when circuit course of emergency crosses Resistance Fault, distance protection is failure to actuate.But above-mentioned measure can not prevent accident excessively negative
Distance protection misoperation during lotus.
The content of the invention
To overcome drawbacks described above, the invention provides a kind of line protection method, various overloads can be recognized, including just
Normal overload and accident overload, symmetrical overload and asymmetrical overload.Under Overload, reliable locking distance is protected
In the case of shield, failure, the resistance to transition resistance ability of distance protection in route protection greatly improved in open distance protection.
To achieve the above object, the present invention is achieved by the following technical solutions：
A kind of line protection method, the described method comprises the following steps：
(1) three-phase current and voltage I of circuit are installed in collection protectionA,IB,IC, and UA,UB,UC, calculate positive sequence, negative phase-sequence and
The electric current and voltage of zero sequence, respectively Iμ1,Iμ2,Iμ0, and Uμ1,Uμ2,Uμ0, μ values are A, B, C；
CalculateWith current asymmetry degree m, wherein
For line impedance angle；
(2) according to p1,Fault type is determined with the triangular relations of p2：
Wherein：- 0.3≤p1≤- 0.1,0.5≤p2≤0.6；
IfFor symmetric fault, open distance protection；
If being unsatisfactory forFault type is then determined according to the triangular relation of p3, p4 and m：
Work as m>P3,0.6≤p3≤0.7；For serious unbalanced fault；To prevent from sending out on the basis of serious unbalanced fault
Raw open conductors, take following steps：
MeetFor failure phase, the distance protection of clear failure phase；
It is unsatisfactory forFor non-faulting phase, then useThe quadrant of failure judgement point：WhenFor
I quadrants,For ii quadrant,For ii I quadrants,For
IV quadrants；
As m ＜ p4, p4=0.2 is load, locking distance protection；
It is slight unbalanced fault as p4≤m≤p3, usesFailure judgement point quadrant, whenFor I
Quadrant,For ii quadrant,For ii I quadrants,For iv
Quadrant.
According to p5, p6 andTriangular relation determines the state of phase distance protection：
The state of the phase distance protection is：Open phase distance protection or locking phase distance protection, wherein：
It is U respectively for voltage between phasesAB、UBCAnd UCA；For voltage between phases and the angle of three-phase current, it is respectivelyWith-0.3≤p5≤-0.1；P6 value withCorrelation, when0.4≤p6≤0.5, when
0.7≤p6≤0.8, when0.4≤p6≤0.5, when0.4≤p6≤0.5；
Work as satisfactionWhen, open phase distance protection；
It is unsatisfactory forWhen, locking phase distance protection.
According to p7, p8 andTriangular relation determines the opening or locking of ground distance protection：
Wherein：It is U respectively for phase voltageA、UBAnd UC；For phase voltage and the angle of phase current, it is respectivelyWith-0.3≤p7≤-0.1；P8 value withCorrelation, when0.4≤p8≤0.5, when0.7≤p8≤0.8, when0.4≤p8≤0.5, when
0.4≤p8≤0.5。
According to p7, p8 andTriangular relation determines that the method for opening or the locking of ground distance protection is：
Work as satisfactionOpen ground distance protection；
When being unsatisfactory forWhen, utilizeDetermine failure phase：
If being unsatisfactory forFor non-faulting phase, locking ground distance protection；
Work as satisfactionWhen, when being failure phase：According toDetermine opening or locking that ground distance is protected：
Wherein： For line impedance angle；It is U respectively for phase voltageA、UBAnd UC；For phase voltage and the angle of phase current, it is respectivelyWithIμ2For negative-sequence current, Iμ0For zero-sequence current.
According toDetermine that the opening of ground distance guarantor or the method for locking are：
If being unsatisfactory forLocking ground distance protection.
Work as satisfactionBy p9, p10 andTriangular relation determines opening for ground distance guarantor
Put or locking：
Wherein：-0.3≤p9≤-0.1；0.7≤p10≤0.8； For line impedance angle；It is U respectively for phase voltageA、UBAnd UC；For phase voltage and the angle of phase current, it is respectively With
According to p9, p10 andTriangular relation determines that the opening of ground distance guarantor or the method for locking are：If
It is unsatisfactory forLocking ground distance protection.
If meeting
Pass throughOpening or locking that ground distance is protected are determined, wherein：ForThe offset voltage of phase, ForThe voltage of phase,ForThe electric current of phase, Iμ0For zero-sequence current, k mends for zero sequence
Coefficient is repaid, Zset is to adjust impedance；α=120 °,ε values and separate relevant, failure phase：Leading phaseDelayed phaseM is current asymmetry degree；
If meetingOpen ground distance protection；
If being unsatisfactory forLocking ground distance protection.
Compared with the prior art, a kind of identification overload and the line protection method of failure that the present invention is provided can be recognized respectively
In the case of kind of overload, circuit overload, reliable locking distance protection, in the case of failure, open distance protection greatly improved
The resistance to transition resistance ability of distance protection in route protection, overload need not be adjusted manually with Fault Identification algorithm, by device
Realize in portion；Suitable for 220kV and above transmission line of electricity, distance protection overload mis-operation can be effectively solved, thing is limited
Therefore the expansion of scope.
Brief description of the drawings
Fig. 1 is overload and Fault Identification algorithm flow chart.
Embodiment
A kind of line protection method for recognizing overload and failure is by recognizing the line protective devices of overload and failure
Realize, line protective devices include：Data power module, data input/output module, protection module, communication module.
Power module, for line protective devices, other three modules provide power supply；
Data input/output module, collection protection installation place three-phase current, three-phase voltage and switching value information, acceptance line
Road offside protection signal；The signal sent to offside protection device；
Communication module, completes the information interaction of each board inside protection device, complete protection device and external network and
The information of device is exchanged；
Protection module, the low pass filtered for first carrying out sampled value involves Fourier transformation data prediction, is protected for current differential
Shield, algorithm is identical with current route protection, for distance protection, adds overload with Fault Identification algorithm without operations staff
Adjusted.
The line protection method of identification overload and failure comprises the following steps：
(1) three-phase current and voltage I of collection protection installation placeA,IB,IC,UA,UB,UC, calculate positive sequence, negative phase-sequence and zero sequence
Electric current and voltage, respectively Iμ1,Iμ2,Iμ0, and Uμ1,Uμ2,Uμ0, μ values are A, B, C；
CalculateWith current asymmetry degree m, wherein
For line impedance angle；
(2) judgeScope, ifMeetIt is judged as symmetrical event
Barrier, open distance protection, if it is not satisfied, judge m scope, wherein：P1 is adjusted by failure max calculation error, is preferably：-
There is enough sensitivity to adjust when 0.3≤p1≤- 0.1, p2 is by symmetric fault, be preferably：0.5≤p2≤0.6；
(3) as m ＞ p3, it is judged as serious unbalanced fault, in order to prevent open conductors,
For ground distance protection：
MeetIt is judged as failure phase, the distance protection of clear failure phase；Non-faulting phase, is utilizedSentence
Disconnected position of failure point, whenIt is judged as I quadrants,It is judged as ii quadrant,It is judged as ii I quadrants,It is judged as iv quadrant；
Phase-to phase fault, is utilizedFailure judgement point position, whenIt is judged as I quadrants,It is judged as ii quadrant,It is judged as ii I quadrants,Sentence
Break as iv quadrant, wherein p3 reliable open distance protections in serious unbalanced fault under ensureing heavy load are preferably：0.6
≤p3≤0.7。
(4) as m ＜ p4, it is judged as load, locking distance protection；
Wherein p4 is adjusted by the maximum degree of unbalancedness of normal duty is escaped, and p4 is preferably 0.2.
(5) as p4≤m≤p3, it is judged as slight unbalanced fault, utilizesFailure judgement point position, whenIt is judged as I quadrants,It is judged as ii quadrant,It is judged as
III quadrants,It is judged as iv quadrant.
(6) for phase distance protection, satisfaction is worked asOpen phase distance protection；It is unsatisfactory forLocking phase distance protection；
Wherein：It is U respectively for voltage between phasesAB、UBCAnd UCA；For voltage between phases and the angle of three-phase current, divide
It is notWithP5 is adjusted by failure max calculation error, is preferably -0.3≤p5≤- 0.1；P6 value with
Correlation, whenP6 is preferably 0.4≤p6≤0.5, whenP6 be preferably 0.7≤p6≤
0.8, whenP6 is preferably 0.4≤p6≤0.5, whenP6 be preferably 0.4≤p6≤
0.5。
(7) for ground distance protection, satisfaction is worked asOpen ground distance protection,.For connecing
Ground distance protection, is unsatisfactory forWhen, go to (8)；
Wherein：It is U respectively for phase voltageA、UBAnd UC；For phase voltage and the angle of phase current, it is respectivelyWithP7 is adjusted by failure max calculation error, is preferably -0.3≤p7≤- 0.1；P8 value withCorrelation, whenP8 is preferably 0.4≤p8≤0.5, whenP8 is preferably 0.7≤p8≤0.8, whenP8 is preferably 0.4≤p8≤0.5, whenP8 is preferably 0.4≤p8≤0.5.
(8) utilizeFailure phase is selected, if meetingIt is judged as failure phase, goes to (9) if discontented
FootIt is judged as non-faulting, locking ground distance protection；
(9) for failure phase, judgeIf meeting(10) are gone to, otherwise, locking ground distance is protected
Shield；
(10) whenJudgeIf meeting(11) are gone to, otherwise
Locking ground distance protection；
Wherein p9 is adjusted by failure max calculation error, is preferably -0.3≤p9≤- 0.1；0.7≤p10≤0.8.
(11) whenJudgeIf meetingOpen
Ground distance protection is put, otherwise, locking ground distance protection；
Wherein：ForThe offset voltage of phase, ForThe voltage of phase,ForThe electric current of phase, Iμ0For zero-sequence current, k is zero-utility theory, and Zset is to adjust impedance；α=120 °,ε values and separate relevant, failure phase：Leading phaseDelayed phaseM is current asymmetry degree.
It is to be understood that, present invention and embodiment are intended to prove the reality of technical scheme provided by the present invention
Border is applied, and should not be construed as limiting the scope of the present invention.Those skilled in the art open in spirit and principles of the present invention
Give, can various modifications may be made, equivalent or improve.But these changes or modification are being applied in pending protection domain.
Claims (2)
1. a kind of line protection method, it is characterised in that：It the described method comprises the following steps：
(1) three-phase current and voltage I of circuit are installed in collection protectionA,IB,IC, and UA,UB,UC, calculate positive sequence, negative phase-sequence and zero sequence
Electric current and voltage, respectively Iμ1,Iμ2,Iμ0, and Uμ1,Uμ2,Uμ0, μ values are A, B, C；
CalculateWith current asymmetry degree m, wherein For circuit
Impedance angle；
(2) according to p1,Fault type is determined with the triangular relations of p2：
Wherein：- 0.3≤p1≤- 0.1,0.5≤p2≤0.6；
IfFor symmetric fault, open distance protection；
If being unsatisfactory forFault type is then determined according to the triangular relation of p3, p4 and m：
Work as m>P3,0.6≤p3≤0.7；For serious unbalanced fault；
To prevent open conductors on the basis of serious unbalanced fault, following steps are taken：
MeetFor failure phase, the distance protection of clear failure phase；
It is unsatisfactory forFor non-faulting phase, then useThe quadrant of failure judgement point：WhenFor I
Quadrant,For ii quadrant,For ii I quadrants,For iv
Quadrant；
As m ＜ p4, p4=0.2 is overload, locking distance protection；
It is slight unbalanced fault as p4≤m≤p3, usesFailure judgement point quadrant, whenFor I quadrants,For ii quadrant,For ii I quadrants,For iv as
Limit；
According to p7, p8 andTriangular relation determines the opening or locking of ground distance protection：
Wherein：It is U respectively for phase voltageA、UBAnd UC；For phase voltage and the angle of phase current, it is respectivelyWith-0.3≤p7≤-0.1；P8 value withCorrelation, when0.4≤p8≤0.5, when , 0.7≤p8≤0.8, when , 0.4
≤ p8≤0.5, when0.4≤p8≤0.5；
According to p7, p8 andTriangular relation determines that the method for opening or the locking of ground distance protection is：
Work as satisfactionOpen ground distance protection；
When being unsatisfactory forWhen, utilizeDetermine failure phase；
UtilizeDetermine that the method for failure phase comprises the following steps：
If being unsatisfactory forFor non-faulting phase, locking ground distance protection；
Work as satisfactionWhen, when being failure phase：According toDetermine opening or locking that ground distance is protected：
Wherein： For line impedance angle；It is U respectively for phase voltageA、UBAnd UC；For mutually electricity
The angle of pressure and phase current, be respectivelyWithIμ2For negative-sequence current, Iμ0For zero-sequence current；
According toDetermine that the opening of ground distance guarantor or the method for locking are：
If being unsatisfactory forLocking ground distance protection；
Work as satisfactionBy p9, p10 andTriangular relation determines opening or closing for ground distance guarantor
Lock：
Wherein：-0.3≤p9≤-0.1；0.7≤p10≤0.8； For line impedance angle；For
Phase voltage, is U respectivelyA、UBAnd UC；For phase voltage and the angle of phase current, it is respectivelyWith
According to p9, p10 andTriangular relation determines that the opening of ground distance guarantor or the method for locking are：
If being unsatisfactory forLocking ground distance protection；
If meetingPass throughOpening or locking that ground distance is protected are determined, wherein：ForThe offset voltage of phase, ForThe voltage of phase,ForThe electric current of phase, Iμ0For
Zero-sequence current, k is zero-utility theory, and Zset is to adjust impedance,For positive sequence voltage value；α=120 °,ε values and separate relevant, failure phase：Leading phaseDelayed phaseM is current asymmetry degree；
If meetingOpen ground distance protection；
If being unsatisfactory forLocking ground distance protection.
2. line protection method according to claim 1, it is characterised in that：According to p5, p6 andIt is triangular
Relation determines the state of phase distance protection：
The state of the phase distance protection is：Open phase distance protection or locking phase distance protection, wherein：For phase
Between voltage, be U respectivelyAB、UBCAnd UCA；For voltage between phases and the angle of three-phase current, it is respectivelyWith-
0.3≤p5≤-0.1；P6 value withCorrelation, when0.4≤p6≤0.5, when0.7≤
P6≤0.8, when0.4≤p6≤0.5, when0.4≤p6≤0.5；
Work as satisfactionWhen, open phase distance protection；
It is unsatisfactory forWhen, locking phase distance protection.
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| CN105207176B true CN105207176B (en) | 2017-07-14 |
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| US11143715B2 (en) * | 2019-08-15 | 2021-10-12 | Schweitzer Engineering Laboratories, Inc. | Broken conductor detection in a multiple-phase electric power delivery system |
| CN113759182A (en) * | 2021-08-26 | 2021-12-07 | 北京四方继保工程技术有限公司 | Method and system for judging direction of asymmetric fault impedance by using non-fault phase voltage |
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| CN103545798B (en) * | 2013-10-18 | 2016-08-03 | 国家电网公司 | The distance protecting method of fault opening element in a kind of out-of-step blocking |
| CN103545782B (en) * | 2013-10-18 | 2016-05-25 | 国家电网公司 | A kind of distance protection setting method of out-of-step blocking |
| CN104134976B (en) * | 2014-08-14 | 2017-03-08 | 国家电网公司 | Fault recognition method in a kind of transmission line distance protecting |
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