CN104993460A - Improvement method of simple bus protection - Google Patents
Improvement method of simple bus protection Download PDFInfo
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- CN104993460A CN104993460A CN201510347289.9A CN201510347289A CN104993460A CN 104993460 A CN104993460 A CN 104993460A CN 201510347289 A CN201510347289 A CN 201510347289A CN 104993460 A CN104993460 A CN 104993460A
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- breaker
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- bus protection
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Abstract
The invention discloses an improvement method of simple bus protection. The steps are as follows: when a protective device in a power supply line-incoming switch cabinet judges that a bus has a fault, the protective device sends out a tripping command to a switch in the cabinet, and protective shunt tripping is performed on a related breaker through the protective device or other protective devices; after the protective device sends out a bus protection tripping command to a breaker in the cabinet, whether an in-cabinet dead zone fault occurs is judged through combination with a breaker position criterion and a current signal criterion; and, after the protective device judges that the in-cabinet dead zone fault occurs, the protective device sends out a shunt tripping command to the related breaker. The improvement method of the simple bus protection is as an improvement of existing simple bus protection, a fault between a current transformer and the breaker is rapidly cut off and isolated, and, on the premise that equipment is not increased and a power outage scope is not expanded, the fact that the dead zone fault is cut off and isolation of a fault point are rapidly completed, so damage of the fault on equipment and personnel is reduced, and a favorable condition is provided for quick recovery of a power supply system.
Description
Technical field
The invention belongs to field of power, is the improvement to simple and easy bus protection, is applicable to the subway mesolow electric power system adopting simple and easy bus protection principle, particularly relates to improving one's methods of a kind of simple and easy bus protection.
Background technology
The simple and easy bus protection principle of the many employings of mesolow electric power system realizes bus and realizes protection; simple and easy bus protection principle bus protection function is distributed to during the power supply component be connected with bus protects; the logic contact controlled by gathering power unit protection fault detect section realizes selectively excising fault bus; become distributing protection system with the power unit protective device that bus is directly connected with power supply unit protective device coordinated groups by some, realize bus protection.
Switch cubicle in mesolow electric power system is usually only at circuit breaker one-sided configuration current transformer.Aging due to apparatus insulated material, circuit breaker design and installation in advance unreasonable, and the reason such as the misoperation of later stage maintainer, break down between current transformer in switch cabinet and circuit breaker and cannot avoid completely.When breaking down between circuit breaker summation current transformer; for adopting the electric power system of simple and easy bus protection principle, although protective device can this circuit breaker of quick acting tripping, but still effectively fault current cannot be excised; fault point cannot be properly isolated, thus forms protection's dead-zone.Switch cubicle dead-zone fault constitutes a serious threat for the protection of primary equipment and the safety of personnel, the extreme influence normal operation of mesolow electric power system.
For subway mesolow electric power system, its supply network is connected in series by several 10kV or 35kV traction institute and forms, when existing subway mesolow electric power system guard method many employings fault occurs, identification and the excision that block signal completes fault point is sent out mutually between protective device, but when there is dead-zone fault in switch cubicle in existing scheme, need to rely on the backup protection of higher level supply line to complete the excision of fault, but for this electric power system, time delay the closer to its backup protection of mains side is longer, and therefore the time of excision needed for fault is also longer; For the dead-zone fault that power outlet occurs, fault point cannot really isolate, and makes subordinate's electric power system cannot quick-recovery soon, and adds subordinate's electric power system and close risk in fault.Existing subway mesolow electric power system guard method process dead-zone fault, motion analysis is as follows:
1) the K1 point in Fig. 1 (a) breaks down, protective device sends trip signal can to inlet wire 301 switch, line 303 switch is jumped out in parallel connection, but fault point still exists, the excision of fault can only be completed by the backup protection of higher level's switch, add fault clearing time, be unfavorable for the fast quick-recovery of electric power system;
2) the K2 point in Fig. 1 (a) breaks down, and protective device send trip signal can to inlet wire 301 switch, and line 303 switch is jumped out in parallel connection, and fault point is not isolated out electric power system, adds rear class electric power system and closes risk in fault;
3) the K3 point in Fig. 1 (b) breaks down, protective device sends trip signal can to mother 300 switch, and outlet 301,303 switch is jumped in parallel connection, but fault point still exists, the excision of fault can only be completed by the backup protection of 302 switches, add fault clearing time;
4) the K4 point in Fig. 1 (b) breaks down; protective device sends trip signal can to mother 300 switch; outlet 301,303 switch is jumped in parallel connection, but fault point is not isolated out electric power system, adds rear class electric power system and closes risk in fault.
In sum, existing guard method None-identified has the fault occurred between current transformer in switch cabinet and circuit breaker, and causing fault can not be excised fast, and fault point can not be isolated completely, cannot realize the fast quick-recovery of electric power system.
Summary of the invention
The object of the invention is to improve simple and easy bus protection, realize the quick response to the fault occurred between current transformer and circuit breaker, complete quick excision and the isolation of fault point.After it relies on simple and easy bus protection actuating signal to send, by this protective device or other protective devices, protection connection is carried out to relative breaker and jump, under the prerequisite not expanding power failure range, realize the completely isolated of fault point, avoid system to close in fault.When after bus protection action, circuit breaker tripping and still have electric current to flow through instrument transformer, then determine there occurs dead-zone fault in cabinet, sends connection and jump order, come the rapid excision of fault and the completely isolated of fault point by protective device superior mains switch.This improves one's methods, and reduces the injury of fault to equipment and personnel, for the fast quick-recovery of electric power system provides condition.
In order to reach above-mentioned purpose, technical scheme of the present invention is: improving one's methods of simple and easy bus protection, it is characterized in that comprising the steps:
(1) when busbar fault judged by electric power incoming line protective device, in this cabinet, switch sends trip signal, carries out protection connection jump relative breaker;
(2) after electric power incoming line protective device sends bus protection trip signal to this cabinet breaker, in conjunction with circuit breaker position criterion and current signal criterion, judge whether dead-zone fault in cabinet occurs;
(3) after interior dead-zone fault is offerd for sale in the judgement of electric power incoming line protective device, then connection immediate skip is sent to relative breaker.
Further, in described step (1), described relative breaker comprises same section bus outlet switch, also comprises the subordinate switch adjacent with outlet switch.
Further, in described step (1), the protection connection of relative breaker is jumped and is completed by the electric power incoming line protective device of this cabinet or the electric power incoming line protective device of non-cabinet.
Further, in described step (2), circuit breaker position signal criterion be by gathering the jumping of circuit breaker, co-bit information determines the whether tripping of this cabinet inner breaker.
Further, in described step (3), described relative breaker is higher level's mains switch of this cabinet breaker.
After adopting such scheme, the invention has the beneficial effects as follows: after bus protection action, connection immediate skip is sent to power outlet and subordinate's switch of being adjacent by this protective device or other protective devices, can under the prerequisite not expanding power failure range, prevent the dead-zone fault of power outlet, realize the completely isolated of fault point; After bus protection action, judged by the combination of circuit breaker position signal and current signal, determine whether dead-zone fault in cabinet occurs.If be dead-zone fault in cabinet, then after the shorter dead-zone fault judgement time, send the instruction that grade switch jumped onto by connection, thus realize the quick excision of fault.The quick excision of fault point and the completely isolated of fault point, for the fast quick-recovery of the electric power systems such as subway provides condition.
Accompanying drawing explanation
Fig. 1 (a), (b) are the switch cubicle dead-zone fault position view that subway mesolow electric power system occurs respectively.
Fig. 2 is the protective relaying device logic diagram of the embodiment of the present invention.
In figure, a-bus protection actuating signal, b-current signal criterion, c-circuit breaker position criterion, d-AND gate operation logic, e-dead band judges the time.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
Improving one's methods of this simple and easy bus protection, comprises the steps:
(1) when busbar fault judged by electric power incoming line protective device, in this cabinet, switch sends trip signal, carries out protection connection jump relative breaker;
(2) after electric power incoming line protective device sends bus protection trip signal to this cabinet breaker, in conjunction with circuit breaker position criterion and current signal criterion, judge whether dead-zone fault in cabinet occurs;
(3) after interior dead-zone fault is offerd for sale in the judgement of electric power incoming line protective device, then connection immediate skip is sent to relative breaker.
Preferably, in described step (1), described relative breaker comprises same section bus outlet switch, also comprises the subordinate switch adjacent with outlet switch.In described step (1), the protection connection of relative breaker is jumped and is completed by the electric power incoming line protective device of this cabinet or the electric power incoming line protective device of non-cabinet.Circuit breaker position signal criterion be by gathering the jumping of circuit breaker, co-bit information determines the whether tripping of this cabinet inner breaker.In described step (3), described relative breaker is higher level's mains switch of this cabinet breaker.
Below dead zone protection logic of the present invention is introduced in detail as shown in Figure 2; wherein; after simple and easy bus protection action; jumped with section bus outlet switch and the subordinate switch adjacent with outlet switch by this protective device or other protective devices connection; can effectively prevent outlet dead-zone fault, realize the completely isolated of fault point.After the bus protection action of protective device, if circuit breaker tripping but still have electric current to flow through instrument transformer, then can judge that fault point is between circuit breaker summation current transformer.After the dead band judgement time, jump onto by connection the excision that level power supply switch completes fault point.
Circuit breaker position signal criterion of the present invention refers to by gathering the jumping of circuit breaker, co-bit information determines the whether tripping of this cabinet inner breaker.The tripping state of circuit breaker both can judge by jumping position signal, also can be inferred by co-bit signal, can also be determined by jumping, co-bit two-position signal.
Electric current criterion of the present invention then comes from the signal that in this cabinet, current transformer collects, and can be that maximum phase current is greater than criterion threshold to determine, also can be that minimum phase current is greater than criterion threshold to determine; Its criterion threshold can need to determine according to scene.
After adopting method of the present invention, the identification of dead-zone fault can be completed rapidly, and complete excision and the isolation of fault point fast, thus reduce the injury of fault to equipment and personnel, be conducive to the fast quick-recovery of electric power system.
In order to set forth guard method of the present invention, spy enumerates following examples according to electric power supply system for subway, but electric power supply system for subway structure is only as a kind of way of realization of inventive concept, and for similar electric power system structure, the present invention is applicable equally.This guard method process dead band fault actions is analyzed as follows:
1) the K1 point in Fig. 1 (a) breaks down, protective device sends trip signal to 301 switches, jumping in parallel 303 switches and 401 switches, after Dead Time in short-term, protective device judges that 301 switches still exist as jumping position and fault current, then send connection to 203 switches and jump order, it substantially reduces the time of failure removal, achieve the correct isolation of fault point, for the fast quick-recovery of the electric power systems such as subway provides condition;
2) the K2 point in Fig. 1 (a) breaks down, and protective device sends trip signal to 301 switches, in parallel jumps 303 switches and 401 switches, and it achieves the correct isolation of fault point, avoids rear class electric power system and closes risk in fault;
3) the K3 point in Fig. 1 (b) breaks down, protective device sends trip signal to 300 switches, jumping 301 switches, 401 switches, 303 switches and 203 switches in parallel, after Dead Time in short-term, protective device judges that 300 switches still exist as jumping position and fault current, then send connection to 302 and 304 switches and jump order, thus under the prerequisite not expanding power failure range, substantially reduce the time of failure removal, achieve the correct isolation of fault point;
4) the K4 point in Fig. 1 (b) breaks down; protective device sends trip signal to 300 switches; jumping 301 switches, 401 switches, 303 switches and 203 switches in parallel; it completes the correct isolation of fault point; the system of substantially reducing closes the risk in fault, and the fast quick-recovery of the power supply for system provides condition.
In a word, the step of improving one's methods of this simple and easy bus protection is: when busbar fault judged by the protective device in electric power incoming line switch cubicle, in this cabinet, switch sends trip signal, and carries out the jumping of protection connection by this protective device or other protective devices to relative breaker; After protective device sends bus protection trip signal to this cabinet breaker, in conjunction with circuit breaker position criterion and current signal criterion, judge whether dead-zone fault in cabinet occurs; Protective device judgement is offerd for sale after interior dead-zone fault, then send connection immediate skip to relative breaker.The present invention is as the improvement of existing simple and easy bus protection; fault between current transformer and circuit breaker is excised fast and isolates; do not increase equipment and do not expand power failure range prerequisite under; complete rapidly the excision of dead-zone fault and the isolation of fault point; thus reduce the injury of fault to equipment and personnel, for the fast quick-recovery of electric power system provides the condition of profit.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and in this protection scheme, the transmission of electric current criterion signal can by comprising cable, optical fiber, the medium such as wireless; The transmission of signal jumped by protection connection can by comprising cable, optical fiber, the medium such as wireless; The transmission of circuit breaker position criterion signal can by comprising cable, optical fiber, the medium such as wireless.Every technological thought proposed according to the present invention, any change that technical method basis is done, all falls within scope.
Claims (5)
1. the improving one's methods of simple and easy bus protection, is characterized in that comprising the steps:
(1) when busbar fault judged by electric power incoming line protective device, in this cabinet, switch sends trip signal, carries out protection connection jump relative breaker;
(2) after electric power incoming line protective device sends bus protection trip signal to this cabinet breaker, in conjunction with circuit breaker position criterion and current signal criterion, judge whether dead-zone fault in cabinet occurs;
(3) after interior dead-zone fault is offerd for sale in the judgement of electric power incoming line protective device, then connection immediate skip is sent to relative breaker.
2. the improving one's methods of simple and easy bus protection as claimed in claim 1, it is characterized in that: in described step (1), described relative breaker comprises same section bus outlet switch, also comprises the subordinate switch adjacent with outlet switch.
3. the improving one's methods of simple and easy bus protection as claimed in claim 1, is characterized in that: in described step (1), and the protection connection of relative breaker is jumped and completed by the electric power incoming line protective device of this cabinet or the electric power incoming line protective device of non-cabinet.
4. the improving one's methods of simple and easy bus protection as claimed in claim 1, is characterized in that: in described step (2), and circuit breaker position signal criterion is jumping by gathering circuit breaker, co-bit information determines the whether tripping of this cabinet inner breaker.
5. the improving one's methods of simple and easy bus protection as claimed in claim 1, it is characterized in that: in described step (3), described relative breaker is higher level's mains switch of this cabinet breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510347289.9A CN104993460A (en) | 2015-06-21 | 2015-06-21 | Improvement method of simple bus protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510347289.9A CN104993460A (en) | 2015-06-21 | 2015-06-21 | Improvement method of simple bus protection |
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| CN104993460A true CN104993460A (en) | 2015-10-21 |
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| CN201510347289.9A Pending CN104993460A (en) | 2015-06-21 | 2015-06-21 | Improvement method of simple bus protection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204665A (en) * | 2021-12-15 | 2022-03-18 | 华能平凉发电有限责任公司 | Method for rapidly switching standby power supply in case of low-voltage branch dead zone fault of high-rise plant |
| CN114400635A (en) * | 2022-01-18 | 2022-04-26 | 南京国电南自轨道交通工程有限公司 | Circuit breaker dead zone protection method |
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| CN104269824A (en) * | 2014-09-19 | 2015-01-07 | 国家电网公司 | Fault judgment method and backup protection method for medium-voltage side dead zone in main transformer |
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2015
- 2015-06-21 CN CN201510347289.9A patent/CN104993460A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002078191A (en) * | 2000-08-23 | 2002-03-15 | Toshiba Corp | Auxiliary switch device |
| CN101557101A (en) * | 2008-10-14 | 2009-10-14 | 吴宏斌 | Relay protection method for eliminating failure in transformer dead zone |
| CN102231564A (en) * | 2011-07-12 | 2011-11-02 | 南京中德保护控制系统有限公司 | Stand-by power supply automatic switch method for multi-stage series connection power supply network |
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| CN104269824A (en) * | 2014-09-19 | 2015-01-07 | 国家电网公司 | Fault judgment method and backup protection method for medium-voltage side dead zone in main transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204665A (en) * | 2021-12-15 | 2022-03-18 | 华能平凉发电有限责任公司 | Method for rapidly switching standby power supply in case of low-voltage branch dead zone fault of high-rise plant |
| CN114400635A (en) * | 2022-01-18 | 2022-04-26 | 南京国电南自轨道交通工程有限公司 | Circuit breaker dead zone protection method |
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Application publication date: 20151021 |