CN100581020C - Method for realizing line high-resistance fast trip using zero-sequence loop fuction - Google Patents
Method for realizing line high-resistance fast trip using zero-sequence loop fuction Download PDFInfo
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- CN100581020C CN100581020C CN200710098648A CN200710098648A CN100581020C CN 100581020 C CN100581020 C CN 100581020C CN 200710098648 A CN200710098648 A CN 200710098648A CN 200710098648 A CN200710098648 A CN 200710098648A CN 100581020 C CN100581020 C CN 100581020C
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Abstract
The invention discloses a method that by judging the voltage and current in protection assemblage to judge whether is there inner and outer fault and combining the direction of side zero sequence current to realize the protection criterion of high voltage wire under condition of high-resistance. The method includes following steps: the high voltage circuit protection device samples the current and voltage waveform of mutual-inductor to obtain the current and voltage instantaneous value; gaining the complex expression of electric quantity by the Fourier algorithm; filtering the zero-sequence current and zero-sequence voltage at the position of protection and assemblage by filtering algorithm; firstly judging whether the element of this side fulfill the condition of positive and negative direction, if this side does not fulfill the condition of positive and negative direction, then judging whether the zero-sequence quantity of the other side fulfill the positive direction criterion, if the other side fulfills the zero-sequence positive direction criterion, combining the concrete condition of this side, two ends trip quickly to fulfill the requirement of high resistance fault quick trip for high voltage lines. The method recognizes the zero-sequence direction of lines high resistance grounding fault more precisely, and increases the selectivity, reliability of zero-sequence protection, fulfills the requirement of quick action under condition of high resistance. It can guarantee the safe and reliable running of protection at the same time increase the sensitivity of zero-sequence protection.
Description
Technical field
The present invention relates to field of power, relate more specifically to the method for relaying protection.
Background technology
Transmission line is the basic equipment of electric power system generating, conveying electricity etc., occupies important status in electric power system.And transmission line often needs to pass through ground such as mountain area, plateau, frequent in recent years generation is owing to the high resistance earthing fault that branch, mao bamboon discharge and damage to crops caused by thunder, mountain fire are caused, bigger to main system influence, cause grid disconnection easily, and major accident such as transformer overstep tripping.High-voltage line protection is undertaken the vital task of carrying electricity, is the important pivot of electric power system.Their costs are very expensive, damaged in case hinder for some reason, and the maintenance difficulty is big, the time is long, and the direct and consequential damage that national economy is caused is very huge.So just selectivity, rapidity, reliability, the sensitivity of high-voltage line protection device are had higher requirement.
For the high-voltage line protection of 220KV～1000KV, because transmission range is long, the regional more complicated of circuit process tends to run into various forms of faults, in recent years since the phenomenon of the protection tripping that high resistance earthing fault causes happen occasionally.When high resistant discontinuity earth fault takes place when, owing to there is stray voltage, cause that circuit microcomputer carrier current protection can not in time move outlet, the scope that causes power failure is the accident of expansion further, has had a strong impact on safe operation.For high resistive fault, the way of longitudinal distance protection solution at present mainly is to stop the letter tripping operation by both sides vertical connection zero sequence.And under actual high resistive fault situation; both sides vertical connection zero sequence might have only the satisfied vertical connection zero sequence of an end to stop the creed part; the vertical connection of other end protection zero sequence can not satisfy condition, or even does not have zero-sequence current, and therefore vertical connection zero sequence often can not satisfy the condition of quick outlet action in the case.And high pressure zero-sequenceprotection will guarantee selectivity, reliability, then needs zero sequence component accurately to declare zero sequence pros always to check on, and only guarantees that when the protection range internal fault, this protective device just can move, and protects akinesia in the other direction.At present zero sequence direction mainly is just to think in the positive direction of protecting fault to have taken place in a certain scope by the phase angle difference between residual voltage and the zero-sequence current relatively, then thinks reverse direction failure or is not fault at other angular range.
The condition of at present traditional vertical zero sequence would trip is, both sides vertical connection zero sequence all be a positive direction, and vertical connection zero sequence positive direction requirement zero-sequence current greater than certain value and residual voltage greater than certain value; For protection TA (current measurement device); TV (voltage measurement element); certain range accuracy is arranged; 10% error as TA; to measuring component is to allow it that error is arranged, and this just requires not allow to protect and declare direction when residual voltage and zero-sequence current during less than certain numerical value; the little then zero-sequenceprotection of zero-sequence current elemental motion condition does not satisfy, then akinesia.On-the-spot ruuning situation shows; when high resistance earthing fault; the zero-sequence current condition generally can both satisfy the operation condition of zero-sequenceprotection; but under certain conditions; as when protecting the installation outlet high resistive fault, offside zero-sequence current and residual voltage do not satisfy condition, on circuits such as 500kV system and ultra high voltage; circuit is long more, and the probability that this kind situation takes place is big more.And for high pressure and extra high voltage line system; often do not allow circuit to operate with failure for a long time; this moment is if rely on the reserve action; then operation time limit is generally longer; therefore need the main protection quick acting, the present invention is directed to this situation, proposition can utilize single-ended zero sequence information; utilize vertical connection optical-fibre channel both sides exchange message, can realize the zero-sequence pilot relay protection fast trip.Utilize the selectivity and the quick-action of the practicable protection of the method,, can realize the fast trip under the high resistant situation of all fronts road in conjunction with normal zero-sequence pilot relay protection.
Summary of the invention
For high resistance earthing fault, especially circuit such as high pressure and ultra high voltage, under the situation that the circuit high resistant fault takes place, the circuit two ends often have only an end to satisfy the condition of zero-sequence current and residual voltage, other end possibility zero-sequence current and residual voltage do not satisfy operation condition, and the present invention mainly solves the QA requirement in the case of vertical connection zero sequence.This method comprises the steps: that line protective devices are sampled to the current-voltage waveform of instrument transformer and obtains the current/voltage instantaneous value; Obtain the plural form of current/voltage instantaneous value by fourier algorithm; Leach zero-sequence component and the negative sequence component and the positive sequence component of electric current and voltage by strain sequence arithmetic; Calculate pilot protection all directions element; As if this side direction forward and to the side direction forward, the both sides fast trip; If pilot protection all directions element all is failure to actuate and this side three-phase voltage is higher than the phase voltage predetermined value; and zero-sequence current is lower than the zero-sequence current predetermined value; then send out and allow signal permission both sides protection fast trip if receive that the offside zero sequence direction is the signal of positive direction this moment.
According to the present invention, adopt the condition of zero sequence loopback fast trip to be:
(this side direction element is non-just non-anti-) ∩ (this side voltage height) ∩ (this side zero-sequence current is low) ∩ (offside zero sequence forward)
In the formula: all used direction component criterions of longitudinal distance protection before the feeling the pulse with the finger-tip of this side direction element;
This side voltage height is meant that the amplitude of three-phase voltage all will be higher than certain value;
This side zero-sequence current is low, is meant that the amplitude that requires this side zero-sequence current is less than certain value;
In the present invention; in the condition of outlet tripping operation; positive and negative direction component all is meant various preface components and the criterion that electric current, voltage calculated with this side; at present; the high-voltage line protection criterion of declaring direction commonly used comprises: direction is declared in the memory impedance, and the sudden change amount is declared direction, and zero sequence component is declared direction; the negative phase-sequence element is declared direction etc., and this all is well-known to those skilled in the art.
This method is more accurate to the identification of high resistance earthing fault; when improving sensitivity, can guarantee the safe and reliable operation protected; when having solved for a long time high resistance earthing fault preferably, if having only single-ended when satisfying operation condition, the technical barrier that existing protection can not correct operation.
Description of drawings
Accompanying drawing 1 is zero sequence loopback action schematic diagram.
Embodiment
Symbol in below discussing uses as follows: current transformer (being called for short TA, as follows) and voltage transformer (being called for short TV, as follows).
At first protect according to the TA of protection installation place and the instantaneous value that TV records electric current and voltage.
Secondly obtain the plural form of each electric parameters by fourier algorithm;
1 logic that shows with reference to the accompanying drawings, step is as follows:
1) at first to calculate the various direction components of pilot protection;
2) as if this side direction forward and to the side direction forward, the both sides fast trip;
3) if all directions element is forward and reverse all is failure to actuate, then judge the size of three-phase voltage and three-phase current;
4) if three-phase voltage greater than a set threshold and zero-sequence current less than a set threshold, this moment is if receive the signal of offside zero sequence forward, then sends out to allow signal to allow both sides protection tripping operation;
When the protection circuit internal faults takes place when, the both sides protection may have only a side can satisfy the condition of zero-sequence current and residual voltage judgement zero-sequence direction component, opposite side electric current and voltage do not have variation substantially, electric pressure is high more, circuit is long more, and the possibility that this situation occurs when the line end high resistive fault is big more, therefore, in this case, use zero-sequence loop fuction can guarantee the pilot protection fast trip; In actual applications, on-the-spot standard voltage value should be about 57.7V, consider certain reliability, the threshold value of phase voltage can be selected in about 50V, and the threshold value of zero-sequence current can be selected to stop the relevant value of letter threshold value with zero sequence, perhaps gets a safety factor, reliably differentiates to guarantee both forward and reverse directions, at present, this coefficient can select 0.9～0.95 times of zero sequence to stop about the letter threshold value; When distinguishing outer high resistive fault, because near the opposite direction element action earlier of fault point, therefore, zero-sequence loop fuction can malfunction.Since use zero-sequence loop fuction need use electric current and voltage, therefore, when the situation of TA broken string and TV broken string, with this protection of locking.
In fact, in the external area error transient process of complexity, for example work as external area error; the residual voltage that the near-end protection is surveyed can satisfy condition; the both forward and reverse directions element of vertical connection direction protection both sides always cooperatively interacts, and therefore when reverse fault, this direction element can misoperation.When phase-to phase fault takes place,, there is not zero-sequence current simultaneously, so this element misoperation can not take place yet owing to there is not residual voltage yet.
In sum; when the present invention has only a side to satisfy the zero sequence component operation condition at high-voltage line protection; in conjunction with the concrete condition of opposite side electric current, voltage, the fast trip under the high resistant situation of practicable all fronts road can guarantee the safe and reliable operation of protective device when improving sensitivity.
Claims (2)
1. the ultra-high-tension power transmission line in electric power system utilizes both sides information to realize the method for fast trip, and this method comprises the steps:
Line protective devices obtain the current/voltage instantaneous value to the current-voltage waveform sampling of instrument transformer;
Obtain the plural form of current/voltage instantaneous value by fourier algorithm;
Leach zero-sequence component and the negative sequence component and the positive sequence component of electric current and voltage by strain sequence arithmetic;
Calculate pilot protection all directions element;
It is characterized in that:
As if this side direction forward and to the side direction forward, the both sides fast trip;
If the positive and negative direction component that this side is calculated does not satisfy the fast trip condition, and this side three-phase voltage is higher than the phase voltage predetermined value, zero-sequence current is less than the zero-sequence current predetermined value, and this moment, then both sides exported tripping operation fast if receive that the offside zero sequence direction is the signal of positive direction.
2. method as claimed in claim 1, in the condition of its middle outlet tripping operation, positive and negative direction component all is meant various preface components and the criterion that electric current, voltage calculated with this side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710098648A CN100581020C (en) | 2007-04-24 | 2007-04-24 | Method for realizing line high-resistance fast trip using zero-sequence loop fuction |
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| CN200710098648A CN100581020C (en) | 2007-04-24 | 2007-04-24 | Method for realizing line high-resistance fast trip using zero-sequence loop fuction |
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| CN100581020C true CN100581020C (en) | 2010-01-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101800441B (en) * | 2010-03-26 | 2012-03-28 | 河南省电力公司许昌供电公司 | Method for processing boundary information deficiency of centralized protector of digitalized converting station |
| CN103779836A (en) * | 2014-02-18 | 2014-05-07 | 国家电网公司 | Transformer winding fault relay protection method based on ring current mutation feature |
| CN105527543B (en) * | 2016-01-26 | 2018-06-01 | 国家电网公司 | A kind of high-tension line indulges connection zero sequence direction method of discrimination and device |
| CN112531656B (en) * | 2020-11-20 | 2021-08-31 | 广东电网有限责任公司 | Relay protection system for high-resistance ground fault of power transmission line |
| CN116247628B (en) * | 2022-12-27 | 2023-12-05 | 国网河北省电力有限公司石家庄市栾城区供电分公司 | Circuit trip stabilizing device and use method |
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| CN1207176A (en) * | 1996-11-04 | 1999-02-03 | Abb传输公司 | Method of detecting and locating a high-resistance earth fault in an electric power network |
| US5784237A (en) * | 1996-11-29 | 1998-07-21 | S&C Electric Company | Control method and apparatus for power distribution network |
| US6694271B1 (en) * | 2001-10-29 | 2004-02-17 | The United States Of America As Represented By The Secretary Of The Navy | Integrated circuit breaker protection software |
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Effective date of registration: 20171226 Address after: 100085 Beijing city on the base of the information industry on the street, No. four, No. 9, Haidian District Co-patentee after: Beijing Sifang Jibao Engineering Technology Co., Ltd. Patentee after: Beijing Sifang Jibao Automation Co., Ltd. Address before: 100085 Beijing city on the base of the information industry on the street, No. four, No. 9, Haidian District Patentee before: Beijing Sifang Jibao Automation Co., Ltd. |