CN102611083B - Method for implementing adaptive zero sequence current network protection - Google Patents
Method for implementing adaptive zero sequence current network protection Download PDFInfo
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- CN102611083B CN102611083B CN201210059106.XA CN201210059106A CN102611083B CN 102611083 B CN102611083 B CN 102611083B CN 201210059106 A CN201210059106 A CN 201210059106A CN 102611083 B CN102611083 B CN 102611083B
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Abstract
The invention discloses a method for implementing adaptive zero sequence current network protection. The method is characterized by comprising two main steps of grounding transformer zero sequence protection and feeder zero sequence protection. An action fixed value is adaptively adjusted according to the characteristic of a multi-loop grounding failure, so that the reliability of the feeder zero sequence current protection action is guaranteed to the maximum extent, and mis-operation of zero sequence current protection for a grounding transformer serving as a standby is avoided; and therefore, effective protection can be provided for various grounding failures of a power system.
Description
Technical field
The invention belongs to the guard method of electric power system earth fault, be specifically related to the implementation method of electric power system self adaptation zero-sequence current networking protection.
Background technology
Zero-sequence current protection has the advantages such as simple, the required element of principle is few.Therefore, zero-sequence current protection, as the main protection of various ground short circuit faults, is widely used in the medium voltage network of China 35kV and following electric pressure.The setting value of tradition zero-sequence current protection is the feature of utilizing system list loop line earth fault, obtains, and be in operation and remain unchanged by the mode of calculated off-line.But along with the development of modern supply and distribution network, the kind of feeder line earth fault is more and more, also becomes increasingly complex.In the time of many loop lines generation earth fault, can make the distribution characteristics of zero-sequence current that huge change occurs, affect the reliability of zero-sequence current protection action; Make especially the one of the main reasons of ground connection change zero-sequence current protection misoperation in support with the multipoint fault of time difference.The fixing operating value mode adopting for existing zero-sequence current protection, any adjustment is all difficult to fundamentally solve the impact that complicated earth fault causes, and therefore must from protection philosophy, strategy, be improved.
Summary of the invention
In order to overcome the defect of above-mentioned existing zero-sequence current protection technology, the present invention proposes a kind of implementation method of self adaptation zero-sequence current networking protection.The present invention can carry out self adaptation adjustment to action definite value according to the feature of many loop lines earth fault; ensure to greatest extent the reliability of feeder line zero-sequence current protection action; and avoid ground connection in support to become zero-sequence current protection misoperation, thereby provide effective protection for the various earth faults of electric power system.
The present invention is achieved through the following technical solutions: a kind of implementation method of self adaptation zero-sequence current networking protection, and be divided into ground connection and become zero-sequenceprotection and two major parts of feeder line zero-sequenceprotection, wherein ground connection change zero-sequenceprotection comprises the following steps:
S11, protective relaying device power on;
S12, initialize become zero-sequenceprotection setting value I to ground connection
g0.set;
S13, record ground connection and become the amplitude I of zero-sequence current
g0;
S14, judge whether to meet I
g0>=I
g0.setif, meet, ground connection becomes zero-sequenceprotection startup, and mask register TG starts timing simultaneously, if do not met, returns to step S13;
The mask register TG that S15, ground connection become zero-sequenceprotection receives the reset signal from feeder breaker action simultaneously;
The amplitude I of ground connection change zero-sequence current is measured in S16, continuation
g0; When mask register TG reaches set point T
g.set, ground connection becomes zero-sequenceprotection action;
Feeder line zero-sequenceprotection comprises the following steps:
S21, protective relaying device power on;
S22, initialize are to feeder line zero-sequenceprotection setting value I
l0.setand feeder line zero-sequence current lower limit I
l0.ub;
S23, measure this circuit and collect the amplitude I of all the other each feeder line zero-sequence currents except this circuit
l0i, and measure ground connection and become the amplitude I of zero-sequence current
g0, i=1,2 ..., n;
S24, calculate the maximum I of feeder line zero-sequence current amplitude
l0.max=max (I
l0i);
S25, judge whether to meet following three conditions: (1), receive that ground connection becomes the enabling signal of zero-sequenceprotection simultaneously; (2), I
l0.max>=I
l0.ub; (3), I
g0>I
l0.max; If so, fault type coefficient is K
r=I
l0.max/ I
g0, if not, fault type coefficient is K
r=1;
S26, obtain after fault type coefficient, online modification feeder line zero-sequenceprotection setting value is I'
l0.set=K
ri
l0.set;
S27, judge whether to meet I
l0i>=I'
l0.set, i=1,2 ..., n; If so, feeder line zero-sequenceprotection starts, and the mask register TL of feeder line zero-sequenceprotection starts timing simultaneously, if not, returns to step S23;
S28, reach the default set point TL.set of mask register TL as the mask register TL of feeder line zero-sequenceprotection, feeder line zero-sequenceprotection action excision faulty line;
After S29, feeder line excision, feeder line zero-sequenceprotection sends reset signal to the mask register TG of ground connection change zero-sequence current protection after detecting no current.
Compared with prior art, the beneficial effect that the present invention realizes self adaptation zero-sequence current networking protection is: the type that can correctly identify according to the distribution characteristics of zero-sequence current earth fault, and the online action definite value of dynamically revising feeder line zero-sequence current protection, ensure preferentially to be moved by feeder line zero-sequence current protection in the time of circuit generation earth fault; In the time that fault feeder trips successfully, become zero-sequenceprotection mask register toward ground connection and send reset signal, ensure time difference misoperation when ground connection change zero-sequence current protection can not excise in succession because of circuit.Therefore the present invention can solve the refuse malfunction problem of existing zero-sequenceprotection in the time of many feeder lines simultaneous faults, has greatly improved selectivity and the reliability of zero-sequence current protection, and the method only need exchange zero-sequence current amplitude information, and the traffic is little, is easy to Project Realization.
Brief description of the drawings
Fig. 1 is the flow chart of implementation method of the present invention.
Embodiment
Illustrate embodiments of the present invention below in conjunction with accompanying drawing, chosen in an embodiment several different earth fault, protective feature of the present invention is described in further detail, but embodiments of the present invention are not limited to this.
The implementation method of self adaptation zero-sequence current networking protection of the present invention, can be divided into ground connection and become zero-sequenceprotection and two steps of feeder line zero-sequenceprotection, and wherein ground connection change zero-sequenceprotection (referring to Fig. 1 left-hand component) comprises the following steps:
S11, protective relaying device power on;
S12, initialize become zero-sequenceprotection setting value I to ground connection
g0.set;
S13, record ground connection and become the amplitude I of zero-sequence current
g0;
S14, judge whether to meet I
g0>=I
g0.setif, meet, ground connection becomes zero-sequenceprotection startup, and mask register TG starts timing simultaneously, if do not met, returns to step S13;
The mask register TG that S15, ground connection become zero-sequenceprotection receives the reset signal (being the reset signal sending after feeder line tripping operation) from feeder breaker action simultaneously, and, in the time that feeder line is cut, ground connection becomes the mask register TG zero clearing of zero-sequenceprotection;
The amplitude I of ground connection change zero-sequence current is measured in S16, continuation
g0; When mask register TG reaches set point T
g.set, ground connection becomes zero-sequenceprotection action;
The mask register TG that ground connection becomes zero-sequence current protection receives the reset signal from feeder breaker action, with the malfunction problem that prevents that many line downs time difference from causing.
Feeder line zero-sequenceprotection (referring to Fig. 1 right-hand component) comprises the following steps:
S21, protective relaying device power on;
S22, initialize are to feeder line zero-sequenceprotection setting value I
l0.setand feeder line zero-sequence current lower limit I
l0.ub;
S23, measure this circuit and collect the amplitude I of all the other each feeder line zero-sequence currents except this circuit
l0i, i=1,2 ..., n, and measure ground connection and become the amplitude I of zero-sequence current
g0;
S24, calculate the maximum I of feeder line zero-sequence current amplitude
l0.max=max (I
l0i);
S25, judge whether to meet following three conditions: (1), receive that ground connection becomes the enabling signal of zero-sequenceprotection simultaneously; (2), I
l0.max>=I
l0.ub; (3), I
g0>I
l0.max; If so, fault type coefficient is K
r=I
l0.max/ I
g0, if not, fault type coefficient is K
r=1;
S26, obtain after fault type coefficient, online modification feeder line zero-sequenceprotection setting value is I'
l0.set=K
ri
l0.set;
S27, judge whether to meet I
l0i>=I'
l0.set, i=1,2 ..., n; If so, feeder line zero-sequenceprotection starts, and the mask register TL of feeder line zero-sequenceprotection starts timing simultaneously, if not, returns to step S23;
S28, reach the default set point T of mask register TL as the mask register TL of feeder line zero-sequenceprotection
l.set, feeder line zero-sequenceprotection action excision faulty line;
After S29, feeder line excision, feeder line zero-sequenceprotection sends reset signal to the mask register TG of ground connection change zero-sequence current protection after detecting no current.
Step S23 ?the S25 zero-sequence current that to be feeder line zero-sequence current protection become all feeder lines that record and ground connection by network collect, further calculate that amount of amplitude maximum in feeder line zero-sequence current, then informix is got up.Feeder line zero-sequence current protection can correctly be identified according to the distribution characteristics of zero-sequence current the type of earth fault: I
l0.maxwith I
l0.ubcomparative result can judge whether fault is present among feeder line; Ground connection becomes enabling signal and the I of zero-sequenceprotection
g0with I
l0.maxcomparative result can judge the type of feeder fault.In the time meeting above-mentioned all conditions, show to have occurred many loop lines homophase earth fault, now fault type coefficient modifying is K
r=I
l0.max/ I
g0, otherwise K
r=1.
Obtain after fault type coefficient, the definite value of online modification feeder line zero-sequence current protection is I'
l0.set=K
ri
l0.set, and judge it is which loop line breaks down, move and excise fault feeder.After feeder line is cut, becomes zero-sequence current protection mask register TG toward ground connection and send reset signal.This measure object is that on the one hand many line downs may exist the time difference successively, and partial fault feeder line can make zero-sequence current redistribution after cut on the other hand, needs the type characteristic of Judging fault again, prevents that ground connection from becoming zero-sequenceprotection and producing malfunction problem.
Lift an engineering construction example below and do more specific description:
With certain 10kV transformer station zero-sequenceprotection data instance, the setting value that its ground connection becomes zero-sequence current protection is I
g0.set=75A, time delay t
g0.act=1s; The setting value of feeder line zero-sequence current protection is I
l0.set=60A, I
l0.ub=20A, t
l0.act=0.6s (being initialization setting value).
Situation 1:
There is single phase ground fault in feeder line F1, protection records I
l01=I
g0=95A.Ground connection becomes zero-sequence current protection: meet I through judgement
g0>I
g0.set, protection starts and waits for time delay; Feeder line zero-sequence current protection: measure and calculate I
l0.max=I
l01=95A, does not meet I through judgement
g0>I
l0.maxso fault type coefficient is K
r=1, definite value does not change, simultaneously due to I
l01>I'
l0.set, protection starts and waits for time delay.Because protection for feed line time delay is shorter, therefore do prior to ground connection variation through 0.6s.After fault feeder is cut, ground connection becomes zero-sequenceprotection and returns.
Situation 2:
Bus generation single phase ground fault, protection records I
g0=95A.Ground connection becomes zero-sequence current protection: meet I through judgement
g0>I
g0.set, protection starts and waits for time delay; Feeder line zero-sequence current protection: calculate I
l0.max=0A, does not meet I through judgement
l0.max>=I
l0.ubso fault type coefficient is K
r=1, definite value does not change, simultaneously due to I
l01<I'
l0.set, protection does not start, and returns to measurement links.Finally by crossing t
g0.actthe variation of=1s ground connection is done, excision fault bus.
Situation 3:
There are two loop line homophase earth faults in feeder line F1, F2, protection records I
l01=55A, I
l02=35A, I
g0=90A.Ground connection becomes zero-sequence current protection: meet I through judgement
g0>I
g0.set, protection starts and waits for time delay; Feeder line zero-sequence current protection: measure and calculate I
l0.max=I
l01=55A, meets ground connection change through judgement and starts & I
l0.max>=I
l0.ubaMP.AMp.Amp I
g0>I
l0.maxso fault type coefficient changes K into
r=0.61, definite value is changed into I'
l0.set=37A; Now, there is I for feeder line 1
l01>I'
l0.set, protection starts and waits for time delay.Finally by crossing t
l0.actthe action of=0.6s protection for feed line, fault feeder F1 is cut, and the delay register TG of the zero-sequenceprotection of ground connection change is simultaneously cleared.Feeder line 2 has I
l02<I'
l0.act, i.e. the zero-sequenceprotection of F2 is failure to actuate.But due to after F1 is cut, system returns to single loop wire single-phase ground fault state, and protection value becomes I afterwards
l02=I
g0=80A.After this process and situation 1 are similar, and F2 after time delay 0.6s is cut in continuation.After all fault feeders are cut, ground connection becomes zero-sequenceprotection and returns.Notice that in whole process the time delay that becomes zero-sequenceprotection due to ground connection was cleared, therefore can be prior to feeder line zero-sequenceprotection misoperation.
Situation 4:
There are two loop line out-phase earth faults in feeder line F1, F2, protection records I
l01=320A, I
l02=430A, I
g0=80A.Ground connection becomes zero-sequence current protection: meet I through judgement
g0>I
g0.set, protection starts and enters wait time delay; Feeder line zero-sequence current protection: measure and calculate I
l0.max=I
l02=430A, does not meet I through judgement
g0>I
l0.maxso fault type coefficient changes K into
r=1, definite value does not change, now I
l01>I'
l0.set, I
l02>I'
l0.setprotection starts and waits for time delay.Finally by crossing t
l0.actthe action of=0.6s protection for feed line, fault feeder F1 is cut, and the delay register TG of the zero-sequenceprotection of ground connection change is simultaneously cleared.Continue F1 after time delay 0.6s, F2 is cut, and ground connection becomes zero-sequenceprotection and returns.
Theoretical and the actual the present invention of showing can correctly identify earth fault type according to the distribution characteristics of zero-sequence current; ensure preferentially to be moved by feeder line zero-sequence current protection in the time of circuit generation earth fault, prevent that ground connection from becoming the time difference misoperation of zero-sequence current protection because of fault or excision simultaneously.Therefore the present invention can improve selectivity and the reliability of zero-sequence current protection greatly.
As mentioned above, just can realize preferably the present invention, above-described embodiment is only preferred embodiment of the present invention, is not used for limiting practical range of the present invention; Be that all equalizations of doing according to content of the present invention change and modify, all by the claims in the present invention scope required for protection is contained.
Claims (1)
1. an implementation method for self adaptation zero-sequence current networking protection, is characterized in that comprising that ground connection becomes zero-sequenceprotection and two steps of feeder line zero-sequenceprotection, and wherein ground connection change zero-sequenceprotection comprises the following steps:
S11, protective relaying device power on;
S12, initialize become zero-sequenceprotection setting value I to ground connection
g0.set;
S13, record ground connection and become the amplitude I of zero-sequence current
g0;
S14, judge whether to meet I
g0>=I
g0.setif, meet, ground connection becomes zero-sequenceprotection startup, and mask register TG starts timing simultaneously, if do not met, returns to step S13;
The mask register TG that S15, ground connection become zero-sequenceprotection receives the reset signal from feeder breaker action simultaneously;
The amplitude I of ground connection change zero-sequence current is measured in S16, continuation
g0; When mask register TG reaches set point T
g.set, ground connection becomes zero-sequenceprotection action;
Feeder line zero-sequenceprotection comprises the following steps:
S21, protective relaying device power on;
S22, initialize are to feeder line zero-sequenceprotection setting value I
l0.setand feeder line zero-sequence current lower limit I
l0.ub;
S23, measure this circuit and collect the amplitude I of all the other each feeder line zero-sequence currents except this circuit
l0i, and measure ground connection and become the amplitude I of zero-sequence current
g0, i=1,2 ..., n;
S24, calculate the maximum I of feeder line zero-sequence current amplitude
l0.max=max (I
l0i);
S25, judge whether to meet following three conditions: (1), receive that ground connection becomes the enabling signal of zero-sequenceprotection simultaneously; (2), I
l0.max>=I
l0.ub; (3), I
g0>I
l0.max; If so, fault type coefficient is K
r=I
l0.max/ I
g0, if not, fault type coefficient is K
r=1;
S26, obtain after fault type coefficient, online modification feeder line zero-sequenceprotection setting value is I'
l0.set=K
ri
l0.set;
S27, judge whether to meet I
l0i>=I'
l0.set, i=1,2 ..., n; If so, feeder line zero-sequenceprotection starts, and the mask register TL of feeder line zero-sequenceprotection starts timing simultaneously, if not, returns to step S23;
S28, reach the default set point T of mask register TL as the mask register TL of feeder line zero-sequenceprotection
l.set, feeder line zero-sequenceprotection action excision faulty line;
After S29, feeder line excision, feeder line zero-sequenceprotection sends reset signal to the mask register TG of ground connection change zero-sequence current protection after detecting no current.
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| CN102856891B (en) * | 2012-10-11 | 2014-11-19 | 广州嘉缘电力科技有限公司 | Self-adapting zero sequence current protection method of feeder line |
| CN103091601B (en) * | 2012-12-28 | 2015-10-28 | 中国电力科学研究院 | A kind of zero-sequence voltage injection accelerated method based on station domain information |
| CN107979067B (en) * | 2017-10-20 | 2022-07-08 | 中国电力科学研究院有限公司 | Zero sequence current protection method and system |
| CN108054737B (en) * | 2017-12-08 | 2019-06-21 | 国网青海省电力公司 | A kind of string benefit asymmetric operation route standby zero-sequenceprotection definite value automatic adjusting method |
| CN108718076A (en) * | 2018-07-02 | 2018-10-30 | 润电新能源（英德）有限公司 | Ground connection becomes relay protecting method and ground connection becomes protective device |
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| HUP0700837A2 (en) * | 2007-12-21 | 2009-08-28 | Andras Dr Dan | Measuring system for localising and identifying a resistance of earth fault in active network and method for using the system |
| CN101719663B (en) * | 2009-12-07 | 2012-05-30 | 梅素真 | Grounding line selection method, grounding line selection device and application system based on active component of zero sequence current |
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