CN102412568A - 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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- CN102412568A CN102412568A CN201110369298XA CN201110369298A CN102412568A CN 102412568 A CN102412568 A CN 102412568A CN 201110369298X A CN201110369298X A CN 201110369298XA CN 201110369298 A CN201110369298 A CN 201110369298A CN 102412568 A CN102412568 A CN 102412568A
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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 the circuit breaker on/off switch process of adjusting.
Background technology
According to power system operation and test experience; When line-breaker has the circuit of high-voltage shunt reactor at combined floodgate; The circuit breaker current DC component maybe be bigger, the long-time not situation of zero passage of electric current might occur, if carry out sub-switching operation immediately after closing a floodgate; Might be because electric current zero passage and can't blow-out not for a long time causes circuit breaker to damage.In practice, breaker closes ceases to be busy when lying prostrate singlephase earth fault in advance if circuit exists, and according to the protection action sequence that generally adopts at present, route protection action command breaker three-phase is separating brake immediately, this situation might occur.
For the current dc component problem, common braking measure has the installing switching-on resistance, adopts and select phase operating breaker etc., but based on research, these two kinds of methods all can't be eliminated current DC biasing phenomenon fully.
China's ultra-high/extra-high voltage circuit all has high-voltage shunt reactor usually.If there is volt singlephase earth fault in advance in circuit, breaker closes the ceases to be busy operation, and this moment is because the single-pole reclosing operation locking, based on the protection action sequence that generally adopts at present, close ceases to be busy after the route protection action can order breaker three-phase separating brake immediately.Flow through the electric current that perfects the phase circuit breaker bigger direct current biasing might occur this moment, causes 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 single phase ground fault in advance as shown in Figure 1.
Visible by Fig. 1, for the fault phase, because the fault current alternating current component is very big, electric current still can zero passage; And for perfecting phase, the circuit breaker current direct current biasing is often very big, and 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, then can't blow-out.And if the arcing time long (the typical normal arcing time is 20ms) might cause circuit breaker to damage.
To current DC biasing problem under this operating mode, common braking measure at present comprises:
(1) on circuit breaker, installs switching-on resistance
On circuit breaker, install switching-on resistance, switching-on resistance drops into earlier during combined floodgate, main contact is closed again.Can play certain inhibitory action to the current DC biasing that making process produces like this.
(2) the phase operating breaker is selected in employing
According to research, the not zero-crossing timing of electric current is relevant with the combined floodgate phase place during crossed belt shunt reactor circuit.Fig. 2 is the single-phase typical current relation of zero-crossing timing and combined floodgate phase place not when closing ceases to be busy, and wherein, voltage is represented with cosine function, 0 °, 180 ° corresponding voltage peak values of combined floodgate phase place.As scheme visiblely, when circuit breaker closed a floodgate near voltage peak (0 °, 180 ° phase places), electric current not zero-crossing timing was the shortest, is about the ms magnitude; And when near voltage zero-cross (90 °, 270 ° phase places), closing a floodgate, electric current not zero-crossing timing is the longest, can reach several s at zero point.There is the situation that singlephase earth fault closes ceases to be busy that lies prostrate in advance for circuit; Owing to be subjected to the influence of factor such as alternate coupling; Perfect phase current not the relation of zero-crossing timing and combined floodgate phase place want complicated; Typically as shown in Figure 3; Zero-crossing timing is not longer for electric current when still closing a floodgate for voltage zero cross near in general, and zero-crossing timing is not shorter for electric current when closing a floodgate near the voltage peak; Even if but close a floodgate at voltage peak point place just, perfect phase current not zero-crossing timing still have and possibly reach 0.2s even surpass 0.4s.
Employing selects the principle of phase operating breaker to be, closes a floodgate near voltage peak through the control circuit breaker, to shorten not zero-crossing timing of electric current.
Above-described current DC biasing braking measure all exists not enough separately, can't thoroughly solve the current slow zero passage problem that produces in the circuit breaker on/off switch process.
1) adopts switching-on resistance
According to domestic and international extra-high voltage network operation statistics, during circuit breaker installing switching-on resistance, the probability that switching-on resistance itself breaks down is higher than some serious heterogeneous fault.And according to operating experience, the probability that the preparatory 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 big, 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) the phase operating breaker is selected in employing
Because present manufacturing process and control system precision, choosing mutually operation exist certain random time deviation, its scope be generally ± 30 °.And three phase line exists when the volt single phase ground fault closes ceases to be busy in advance, like Fig. 3, perfect phase current not the relation of zero-crossing timing and combined floodgate phase place also have certain dispersiveness.Owing to there are these two enchancement factors, adopt and select the phase operating breaker the long-time not situation of zero passage of electric current still might occur, the longest not zero-crossing timing might surpass 0.6s, significantly 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 near voltage peak, to close a floodgate; And for closing the ceases to be busy operation, combined floodgate can cause closing ceases to be busy switching overvoltage height near voltage peak.Run counter to the requirement of combined floodgate phase place this two aspect.
Summary of the invention
The objective of the invention is; Overcome above deficiency, propose a kind of adjustment route protection action sequence that passes through, postpone disjunction and perfect the phase circuit; Avoid when existing preparatory 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 the circuit breaker on/off switch process of adjusting of the present invention; For the transmission line that has the shunt reactor compensation in the electric power system; When closing the ceases to be busy operation, its single-pole reclosing operation locking.The volt single phase ground fault causes the failure of line-breaker separating brake owing to exist in advance on the circuit in order to avoid, when closing ceases to be busy, with the route protection action sequence be adjusted into earlier branchs fault phase, branch perfects phase again.
Above-mentioned route protection action sequence is: if there is volt single phase ground fault in advance on the circuit; Then be harmonious behind the ceases to be busy three; Route protection is the mutually single-phase separating brake of control fault at first; After through the time-delay of certain hour (typical like 1s about or some s), perfect the phase current direct current biasing decay to electric current can zero passage, control again and perfect the phase separating brake.Sequential chart is as shown in Figure 4.
Concrete route protection action sequence is following:
1) circuit that has preparatory volt single phase ground fault is carried out three be harmonious ceases to be busy operations;
2) route protection detects circuit and has single phase ground fault, the single-phase separating brake of control fault phase line-breaker;
3) through (typical as about 1s or some s) after one section time-delay, route protection is controlled and is perfected phase line-breaker separating brake.
The invention has the beneficial effects as follows:
The volt single phase ground fault caused the breaker open operation failure owing to exist in advance when the adjustment route protection sequential that the present invention proposes was avoided closing ceases to be busy, and method is simple, also need not 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 favorable applicability.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further specified.
There is volt single phase ground fault in advance in Fig. 1 circuit, and three when being harmonious ceases to be busy, the typical waveform of switching current;
Fig. 2 is single-phase when closing ceases to be busy electric current is the typical relation of zero-crossing timing and combined floodgate phase place not;
Fig. 3 circuit closes ceases to be busy when having in advance the volt single phase ground fault, perfects the not typical relation of zero-crossing timing and combined floodgate phase place of phase current;
The route protection action sequence that Fig. 4 the present invention proposes.
Embodiment
According to the route protection action sequence that generally adopts at present; Circuit for normal operation; If single phase ground fault occurs on the circuit, the single-phase tripping operation of route protection control both sides line-breaker (is being typically about 1s) single-pole reclosing then behind the certain hour; If fault still exists, the circuit breaker three-phase tripping operation of route protection control both sides; And for the circuit that does not put into operation, the single-pole reclosing operation locking, that is, if there is volt single phase ground fault in advance on the circuit, then when closing ceases to be busy, route protection is controlled circuit breaker three-phase while separating brake immediately after detecting fault.
The route protection action sequence that the present invention proposes does, if there is volt single phase ground fault in advance on the circuit, then is harmonious behind the ceases to be busy three; Route protection is the mutually single-phase separating brake of control fault at first; Behind certain hour, perfect the phase current direct current biasing decay to electric current can zero passage, control perfects the phase separating brake again.Sequential chart is as shown in Figure 4.
Feasibility analysis
(1) for primary cut-out, the control of its three-phase on/off switch is independent mutually, possess first branchs fault phase, after branch perfect the operability of phase.
When (2) there is in advance the volt single phase ground fault in circuit, close ceases to be busy after, the alternating current component of fault phase current is very big, can be because of the current DC biasing causes electric current zero passage not for a long time, shown in Fig. 1 a.Therefore, fault is divided earlier mutually, does not have the problem of current slow zero passage.
(3) for perfecting phase, its electric current that flows through is far below fault current, and circuit breaker is delayed disjunction can not influence system safety.
(4) perfect about phase retardation 1s and can meet the demands usually.For concrete engineering, can adjust according to actual parameter.
(5) the mutually first separating brake of fault, sound phase is separating brake again, and bigger electric current is flow through in the little reactance of shunt reactor neutral point meeting.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 about 100A, and in 10s, decays to zero.Can not cause little reactance to damage.
Invention has been described according to specific exemplary embodiment here.It will be conspicuous under not departing from the scope of the present invention, carrying out suitable replacement to one skilled in the art or revise.Exemplary embodiment only is 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 the circuit breaker on/off switch process for one kind, it is characterized in that:
For the transmission line that has the shunt reactor compensation in the electric power system; When closing the ceases to be busy operation; Its single-pole reclosing operation locking; The volt single phase ground fault causes the failure of line-breaker separating brake owing to exist in advance on the circuit in order to avoid, when closing ceases to be busy, with the route protection action sequence be adjusted into earlier branchs fault phase, branch perfects phase again;
Above-mentioned route protection action sequence is: if there is volt single phase ground fault in advance on the circuit; Then be harmonious behind the ceases to be busy three, route protection is the mutually single-phase separating brake of control fault at first, through after the time-delay of certain hour; Perfect the phase current direct current biasing decay to electric current can zero passage, control perfects the phase separating brake again.
2. the method for claim 1 is characterized in that, concrete route protection action sequence is following:
1) circuit that has preparatory volt single phase ground fault is carried out three be harmonious ceases to be busy operations;
2) route protection detects circuit and has single phase ground fault, the single-phase separating brake of control fault phase line-breaker;
3) through after one section time-delay, route protection control perfecting phase line-breaker separating brake.
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| Application Number | Priority Date | Filing Date | Title |
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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 (5)
| 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 |
| CN106712307A (en) * | 2017-03-23 | 2017-05-24 | 河北农业大学 | Dynamic time-delay sequence switch-on system and method for preventing bias current from damaging breaker |
| 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 |
| CN112134284A (en) * | 2020-10-21 | 2020-12-25 | 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 |
| CN114389233A (en) * | 2020-10-16 | 2022-04-22 | Abb瑞士股份有限公司 | Current interrupter device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2548915A (en) * | 2016-04-01 | 2017-10-04 | General Electric Technology Gmbh | High voltage direct current switchgear |
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
- 2011-11-18 CN CN 201110369298 patent/CN102412568B/en active Active
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 (9)
| 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 |
| CN107078500A (en) * | 2014-10-30 | 2017-08-18 | Abb瑞士股份有限公司 | Method, equipment and interface arrangement between AC electric power systems and direct current power system |
| JP2017537590A (en) * | 2014-10-30 | 2017-12-14 | アーベーベー シュヴァイツ アクツィエンゲゼルシャフト | AC power system and method in DC power system, apparatus for the same, and interface device therebetween |
| CN107078500B (en) * | 2014-10-30 | 2019-02-15 | Abb瑞士股份有限公司 | Method, equipment and interface arrangement between AC electric power systems and direct current power system |
| CN106712307A (en) * | 2017-03-23 | 2017-05-24 | 河北农业大学 | Dynamic time-delay sequence switch-on system and method for preventing bias current from damaging breaker |
| 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 |
| CN114389233A (en) * | 2020-10-16 | 2022-04-22 | Abb瑞士股份有限公司 | Current interrupter device |
| CN112134284A (en) * | 2020-10-21 | 2020-12-25 | 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 |
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| CN102412568B (en) | 2013-12-18 |
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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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