CN102412568B - Method for adjusting line protection motion sequential solution breaker current delay zero crossing - Google Patents
Method for adjusting line protection motion sequential solution breaker current delay zero crossing Download PDFInfo
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- CN102412568B CN102412568B CN 201110369298 CN201110369298A CN102412568B CN 102412568 B CN102412568 B CN 102412568B CN 201110369298 CN201110369298 CN 201110369298 CN 201110369298 A CN201110369298 A CN 201110369298A CN 102412568 B CN102412568 B CN 102412568B
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Abstract
The invention belongs to the power system field, concretely relating to a method for adjusting current delay zero crossing in a line protection motion sequential solution breaker connection/disconnection process. When carrying out an idle wire connection operation on a line which carries a parallel reactor and has a pre-existing singlephase earth fault, since current direct current bias is large, according to a line protection motion sequential which is generally employed, which means that after detecting a fault, a line breaker is controlled to carry out simultaneous brake disconnection of three phases by a line protection unit, a line breaker open operation fails possibly, and present main counter-measures can not thoroughly solve the above problem. According to the invention, reasonable adjustment is carried out on a line protection motion sequential. If the line has the pre-existing singlephase earth fault, when carrying out three-phase idle wire connection, after the fault is detected by the line protection unit, a fault phase line breaker is controlled to carry out single-phase brake disconnection first, after certain time, normal phase current direct current bias weaken to zero crossing of current, then a normal phase line breaker is controlled to carry out brake disconnection.
Description
Technical field
The invention belongs to field of power, be specifically related to a kind of method that the route protection action sequence solves current slow zero passage in circuit breaker on/off switch process of adjusting.
Background technology
According to power system operation and test experience, line-breaker is when the circuit closed a floodgate with high-voltage shunt reactor, the circuit breaker current DC component may be larger, the long-time not situation of zero passage of electric current likely appears, if carry out immediately sub-switching operation after closing a floodgate, likely, due to electric current zero passage and can't blow-out not for a long time, cause circuit breaker to damage.In practice, if when there is pre-volt single phase ground fault in circuit, circuit breaker closes ceases to be busy, according to the protection action sequence generally adopted at present, route protection action command circuit breaker three-phase is separating brake immediately, likely there will be this situation.
For the current dc component problem, common braking measure has the installing switching-on resistance, adopts and select phase operating breaker etc., but, according to research, these two kinds of methods all can't be eliminated current DC biasing phenomenon fully.
China's ultra-high/extra-high voltage circuit is usually all with high-voltage shunt reactor.If there is pre-volt single phase ground fault in circuit, circuit breaker is closed the ceases to be busy operation, now due to the single-pole reclosing operation locking, according to the protection action sequence generally adopted at present, close ceases to be busy after the route protection action can order circuit breaker three-phase separating brake immediately.Now flow through the electric current that perfects the phase circuit breaker and larger direct current biasing likely occurs, cause electric current zero passage not for a long time, can't blow-out.Circuit breaker closes in the typical current waveform that has the nonloaded line that lies prostrate in advance single phase ground fault as shown in Figure 1.
As seen from Figure 1, for fault phase, because the fault current alternating current component is very large, electric current still can zero passage; And, for perfecting phase, the circuit breaker current direct current biasing is often very large, zero-crossing timing is very not long to cause electric current, can reach 1s.For SF commonly used in the high-voltage alternating system
6circuit breaker, if electric current zero passage not, can't blow-out.And if the arcing time long (the typical normal arcing time is 20ms) likely causes circuit breaker to damage.
For current DC biasing problem under this operating mode, common braking measure at present comprises:
(1) install switching-on resistance on circuit breaker
Install switching-on resistance on circuit breaker, during combined floodgate, switching-on resistance first drops into, then main contact is closed.Certain inhibitory action is played in the current DC biasing that can produce making process like this.
(2) adopt and select the phase operating breaker
According to research, during crossed belt shunt reactor circuit, the not zero-crossing timing of electric current is relevant with switching-on phase.Fig. 2 is the single-phase typical electric current relation of zero-crossing timing and switching-on phase not while closing ceases to be busy, and wherein, voltage means with cosine function, 0 °, 180 ° corresponding voltage peak values of switching-on phase.As can be seen, when circuit breaker closes a floodgate near voltage peak (0 °, 180 ° phase places), electric current not zero-crossing timing is the shortest, is about the ms magnitude; And while closing a floodgate near voltage zero-cross (90 °, 270 ° phase places), electric current not zero-crossing timing is the longest, can reach several s at zero point.The situation that exists pre-volt single phase ground fault to close ceases to be busy for circuit, due to the impact that is subject to the factors such as Coupling Between Phases, the relation of zero-crossing timing and switching-on phase is not more complex to perfect phase current, typically as shown in Figure 3, while being still in general near the combined floodgate of voltage zero-cross, zero-crossing timing is not longer for electric current, and while closing a floodgate near voltage peak, zero-crossing timing is not shorter for electric current; Even if but just at voltage peak point place, close a floodgate, perfect phase current not zero-crossing timing still have and may reach 0.2s and even surpass 0.4s.
Employing selects the principle of phase operating breaker to be, by controlling circuit breaker, near voltage peak, closes a floodgate, to shorten not zero-crossing timing of electric current.
Above-described current DC biasing braking measure is Shortcomings separately all, can't thoroughly solve the current slow zero passage problem produced in circuit breaker on/off switch process.
1) adopt switching-on resistance
According to domestic and international supergrid operating statistic result, during circuit breaker installing switching-on resistance, the heterogeneous fault that the probability that switching-on resistance itself breaks down is serious higher than some.And, according to operating experience, the probability that the pre-volt of circuit existence single phase ground fault closes ceases to be busy operation appearance is very low.
In addition, using the greatest problem of switching-on resistance is that its required energy is very large, and circuit breaker manufacturer manufacturing capacity is difficult to meet the demands, and its cost is also quite expensive.
According to research conclusion, adopt switching-on resistance also can not eliminate the current DC biasing fully.
2) adopt and select the phase operating breaker
Due to current manufacturing process and Control system resolution, the choosing mutually the operation exist certain random time deviation, its scope be generally ± 30 °.And three phase line is while existing pre-volt single phase ground fault to close ceases to be busy, as Fig. 3, perfect phase current not the relation of zero-crossing timing and switching-on phase also have certain dispersiveness.Owing to having these two enchancement factors, adopting, select the phase operating breaker the long-time not situation of zero passage of electric current still likely to occur, the longest not zero-crossing timing likely surpasses 0.6s, significantly is greater than the normal arcing time of circuit breaker (being typically 20ms).
On the other hand, for suppressing electric current zero passage phenomenon not for a long time, require to select the phase operating breaker to close a floodgate near voltage peak; And, for closing ceases to be busy operation, near voltage peak, can to cause closing the ceases to be busy switching overvoltage high for combined floodgate.Run counter to the requirement of switching-on phase this two aspect.
Summary of the invention
The objective of the invention is; overcome above deficiency, propose a kind of route protection action sequence that passes through to adjust, postpone disjunction and perfect the phase circuit; avoid when existing pre-volt single phase ground fault circuit to close ceases to be busy, because the current slow zero passage causes the method for breaker open operation failure.
According to a kind of method that the route protection action sequence solves current slow zero passage in circuit breaker on/off switch process of adjusting of the present invention; for the transmission line compensated with shunt reactor in electric power system; when being closed the ceases to be busy operation, its single-pole reclosing operation locking.For avoiding owing to existing pre-volt single phase ground fault to cause the failure of line-breaker separating brake on circuit, when closing ceases to be busy, the route protection action sequence is adjusted into and first divides fault phase, divide and perfect phase again.
Above-mentioned route protection action sequence is: if there is pre-volt single phase ground fault on circuit; after the three-phase combination ceases to be busy; at first route protection controls the single-phase separating brake of fault phase; after the time delay through certain hour (typically as 1s left and right or some s); perfect the phase current direct current biasing decay to electric current can zero passage, then control and perfect the phase separating brake.Sequential chart as shown in Figure 4.
Concrete route protection action sequence is as follows:
1) circuit that has pre-volt single phase ground fault is carried out to the operation of three-phase combination ceases to be busy;
2) route protection detects circuit and has single phase ground fault, controls the single-phase separating brake of fault phase line-breaker;
3) after one section time delay (typically as 1s left and right or some s), route protection is controlled and is perfected phase line-breaker separating brake.
The invention has the beneficial effects as follows:
When the adjustment route protection sequential that the present invention proposes is avoided closing ceases to be busy, owing to existing pre-volt single phase ground fault to cause the breaker open operation failure, method is simple, does not also need increase equipment, has good reliability and economy.This method and other protection are compatible, also can not exert an influence to system and equipment safety operation, have good applicability.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
There is pre-volt single phase ground fault in Fig. 1 circuit, during the three-phase combination ceases to be busy, and the typical waveform of switching current;
Fig. 2 is single-phase while closing ceases to be busy electric current is the typical relation of zero-crossing timing and switching-on phase not;
Fig. 3 circuit closes ceases to be busy while having pre-volt single phase ground fault, perfects the not typical relation of zero-crossing timing and switching-on phase of phase current;
The route protection action sequence that Fig. 4 the present invention proposes.
Embodiment
According to the route protection action sequence generally adopted at present, circuit for normal operation, if occur single phase ground fault on circuit, route protection is controlled the single-phase tripping operation of both sides line-breaker, then (be typically about 1s) single-pole reclosing after certain hour, if fault still exists, route protection is controlled both sides circuit breaker three-phase tripping operation; And for the circuit do not put into operation, the single-pole reclosing operation locking, that is, if there is pre-volt single phase ground fault on circuit,, when closing ceases to be busy, route protection is controlled circuit breaker three-phase while separating brake immediately after fault being detected.
The route protection action sequence that the present invention proposes is, if there is pre-volt single phase ground fault on circuit, after the three-phase combination ceases to be busy; at first route protection controls the single-phase separating brake of fault phase; after certain hour, perfect the phase current direct current biasing decay to electric current can zero passage, then control and perfect the phase separating brake.Sequential chart as shown in Figure 4.
Feasibility analysis
(1) for primary cut-out, its three-phase combination separating brake is controlled independent mutually, possesses the operability of first dividing fault phase, perfecting phase in rear minute.
(2) when there is pre-volt single phase ground fault in circuit, after closing ceases to be busy, the alternating current component of fault phase electric current is very large, can be because the current DC biasing causes electric current zero passage not for a long time, as shown in Figure 1a.Therefore, fault phase first divides, and does not have the problem of current slow zero passage.
(3) for perfecting phase, its electric current flow through is far below fault current, and circuit breaker is delayed disjunction can not affect system safety.
(4) perfecting phase retardation 1s left and right can meet the demands usually.For concrete engineering, can be adjusted according to actual parameter.
(5) the first separating brake of fault phase, sound phase is separating brake again, and Inductance on Neutral of Shunt Reactors can flow through larger electric current.According to the result of calculation (perfecting phase retardation 1s separating brake) of certain 500kV project of transmitting and converting electricity, its current peak is about the 100A left and right, and decays to zero in 10s.Can not cause little reactance to damage.
According to specific exemplary embodiment, invention has been described herein.It will be apparent carrying out to one skilled in the art suitable replacement or revise under not departing from the scope of the present invention.Exemplary embodiment is only illustrative, rather than, to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.
Claims (2)
1. adjust the method that the route protection action sequence solves current slow zero passage in circuit breaker on/off switch process for one kind, it is characterized in that:
For the transmission line compensated with shunt reactor in electric power system, when being closed the ceases to be busy operation, its single-pole reclosing operation locking, for avoiding owing to existing pre-volt single phase ground fault to cause the failure of line-breaker separating brake on circuit, when closing ceases to be busy, the route protection action sequence is adjusted into and first divides fault phase, divide and perfect phase again;
Above-mentioned route protection action sequence is: if there is pre-volt single phase ground fault on circuit;, after the three-phase combination ceases to be busy, at first route protection controls the single-phase separating brake of fault phase, after the time delay through certain hour; perfect the phase current direct current biasing decay to electric current can zero passage, then control and perfect the phase separating brake.
2. the method for claim 1, is characterized in that, concrete route protection action sequence is as follows:
1) circuit that has pre-volt single phase ground fault is carried out to the operation of three-phase combination ceases to be busy;
2) route protection detects circuit and has single phase ground fault, controls the single-phase separating brake of fault phase line-breaker;
3), after one section time delay, route protection is controlled and is perfected phase line-breaker separating brake.
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| CN 201110369298 CN102412568B (en) | 2011-11-18 | 2011-11-18 | Method for adjusting line protection motion sequential solution breaker current delay zero crossing |
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| CN 201110369298 CN102412568B (en) | 2011-11-18 | 2011-11-18 | Method for adjusting line protection motion sequential solution breaker current delay zero crossing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016066196A1 (en) * | 2014-10-30 | 2016-05-06 | Abb Technology Ltd | Method in, apparatus for, and interface arrangement between an alternating current power system and a direct current power system |
| WO2017167744A1 (en) * | 2016-04-01 | 2017-10-05 | General Electric Technology Gmbh | High voltage direct current switchgear |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712307B (en) * | 2017-03-23 | 2023-05-23 | 河北农业大学 | Dynamic time delay sequential closing system and method for avoiding damage to circuit breaker by bias current |
| CN107482599A (en) * | 2017-09-14 | 2017-12-15 | 南京南瑞继保电气有限公司 | Suppress the breaker control method of DC bias current during a kind of line no-load switching |
| EP3985708A1 (en) * | 2020-10-16 | 2022-04-20 | ABB Schweiz AG | Current breaker device |
| CN112134284B (en) * | 2020-10-21 | 2022-05-13 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | 500kV system air-coupled band high-impedance line direct-current bias suppression method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5543597A (en) * | 1993-04-20 | 1996-08-06 | Hitachi, Ltd. | Grounding switch gear device |
| CN1588729A (en) * | 2004-10-14 | 2005-03-02 | 南京南瑞继保电气有限公司 | Re-switch on method for electric tansmission device |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5543597A (en) * | 1993-04-20 | 1996-08-06 | Hitachi, Ltd. | Grounding switch gear device |
| CN1588729A (en) * | 2004-10-14 | 2005-03-02 | 南京南瑞继保电气有限公司 | Re-switch on method for electric tansmission device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016066196A1 (en) * | 2014-10-30 | 2016-05-06 | Abb Technology Ltd | Method in, apparatus for, and interface arrangement between an alternating current power system and a direct current power system |
| US9812982B2 (en) | 2014-10-30 | 2017-11-07 | Abb Schweiz Ag | Method in, apparatus for, and interface arrangement between an alternating current power system and a direct current power system |
| WO2017167744A1 (en) * | 2016-04-01 | 2017-10-05 | General Electric Technology Gmbh | High voltage direct current switchgear |
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Effective date of registration: 20130521 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant after: China Electric Power Research Institute Applicant after: State Grid Corporation of China Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant before: China Electric Power Research Institute |
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