CN1885663A - Surface-protection type switching station fault judging method - Google Patents
Surface-protection type switching station fault judging method Download PDFInfo
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- CN1885663A CN1885663A CN 200610101238 CN200610101238A CN1885663A CN 1885663 A CN1885663 A CN 1885663A CN 200610101238 CN200610101238 CN 200610101238 CN 200610101238 A CN200610101238 A CN 200610101238A CN 1885663 A CN1885663 A CN 1885663A
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Abstract
The related fault decision method for switching station of 12KV-40.5KV power supply system comprises: starting current sensor to send fault signal to a PLC to decide the current source as logic order; for fault from switching station, sending fault current signal criterion as '1', or else as '0' to PLC; using PLC to obtain conclusion: breaking the switch with criterion as '1' and away nearest distance to one with criterion as '0'. This invention has well accuracy on decision, and convenient to maintain.
Description
(1), technical field
The present invention relates to a kind of 12kV～40.5kV electric power system surface-protection type switching station fault judging method.
(2), background technology
Switching station is the expansion and the extension of electric power system transformer station, is undertaking the task of directly distributing electric energy to electricity consumption department, and its application is very extensive.Existing 12kV～40.5Kv switching station adopts the overcurrent protective relaying device in band time limit, guarantees " selectivity " and " quick-action " of the inner upper and lower level of switching station relaying protection.The operation time limit difference is got 0.5S～0.7S between the present upper and lower level protection; promptly when same fault current when up and down the two-stage protective device passes through; the operate time of protection of upper level should make the action earlier of subordinate's mains switch, and not make the action earlier of higher level's switch than the long 0.5S～0.7S of next stage.But this requirement is adjusted for the numerical value of protective relaying device and is brought very large difficulty, causes when physical fault takes place, and the next stage fault can not be excised rapidly, and the anti-master switch of upper level switch or switching station that makes trips, and causes the situation of large-area power-cuts.
(3), summary of the invention:
In order to overcome the shortcoming of prior art, the invention provides a kind of surface-protection type switching station fault judging method, its fault judgement is accurate, can not cause large-area power-cuts, and method is simple and direct, and low price is easy to maintenance.
The present invention solves the technical scheme that its technical problem takes: by current start element current transducer, the fault current signal is sent to the PLC program controller, by the logical relation order, judge the source of fault current by PLC; When a certain user breaks down in the switching station aspect, make switching station to the switches at different levels between this user all can have fault current to pass through, then send to PLC fault current signal criterion and be " 1 ", all the other switch criterions that do not have fault current to pass through are " 0 ", also send to PLC, PLC carried out logic determines and provided conclusion this moment: fault occurs in last criterion for after the switch of " 1 ", and the break distance criterion be that nearest and the criterion of " 0 " is the switch of " 1 ".
The present invention has following advantage: 1, having solved the technical barrier of long-term puzzlement at the electric power system switching station, is a technological innovation to electric power system traditional relay protection pattern, also is replenishing, improving and development existing relaying protection pattern; 2, the present invention adopts PLC as control device, and method is simple and direct, and low price is easy to maintenance, helps large tracts of land of the present invention and promotes the use of; 3, as an important component part of 10kV～35kV electrical power trans mission/distribution system, the present invention is applicable to important places such as the public distribution in city, industrial and mining enterprises, commerce trading center, airport harbour, railway traffic of 50Hz, 10kV～35kV electrical network, operational reliability, assurance power supply quality to improving electric power system have a very important role.
(4), description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Accompanying drawing is a schematic diagram of the present invention.
(5), embodiment
The present invention solves the technical scheme that its technical problem takes: by current start element current transducer, the fault current signal is sent to the PLC program controller; By the logical relation order, judge the source of fault current by PLC.When a certain user breaks down in the switching station aspect, make switching station to the switches at different levels between this user all can have fault current to pass through, then send to PLC fault current signal criterion and be " 1 ", all the other switch criterions that do not have fault current to pass through are " 0 ", also send to PLC.PLC carried out logic determines and provided conclusion this moment: fault occurs in last criterion for after the switch of " 1 ", and the break distance criterion be that nearest and the criterion of " 0 " is that the switch of " 1 " gets final product.Described switch is a vacuum circuit-breaker, and the current start element is a current sensor.
As shown in drawings, illustrate as follows:
(1) when user 1 breaks down:
The 1DL switch has fault current among the last figure, and criterion is " 1 "; The 3DL switch has fault current, and criterion is " 1 "; The 5DL switch has fault current, and criterion is " 1 "; And 6DL fault-free electric current, criterion is " 0 "; 7DL fault-free electric current, criterion are " 0 ".Judge thus: the protective device action of 5DL, the outage of 5DL switch separating brake.Other user's normal power supply under user 2, user 3 and 1DL switch are controlled at this moment.
(2) when M third bus breaks down:
The 1DL switch has fault current among the last figure, and criterion is " 1 "; The 3DL switch has fault current, and criterion is " 1 "; And 5DL switch fault-free electric current, criterion is " 0 "; 6DL fault-free electric current, criterion are " 0 "; 7DL fault-free electric current, criterion are " 0 ".Judge thus: the protective device action of 3DL, the outage of 3DL switch trip.Other user's 4.5 normal power supplies of 1DL switch control this moment.In order to guarantee user's 1,2,3 power supplies, duplicate supply of the present invention is thrown device mutually and is enabled second transformer station stand-by power supply immediately, closes to close the 4DL switch, for user 1,2,3 continues power supply.
Claims (4)
1, a kind of surface-protection type switching station fault judging method is characterized in that: by current start element current transducer, the fault current signal is sent to the PLC program controller, by the logical relation order, judge the source of fault current by PLC; When a certain user breaks down in the switching station aspect, make switching station to the switches at different levels between this user all can have fault current to pass through, then send to PLC fault current signal criterion and be " 1 ", all the other switch criterions that do not have fault current to pass through are " 0 ", also send to PLC, PLC carried out logic determines and provided conclusion this moment: fault occurs in last criterion for after the switch of " 1 ", and the break distance criterion be that nearest and the criterion of " 0 " is that the switch of " 1 " gets final product.
2, surface-protection type switching station fault judging method according to claim 1 is characterized in that: described determination methods is the face protection philosophy.
3, surface-protection type switching station fault judging method according to claim 1 is characterized in that: described the protection and the protection of switching station aspect.
4, surface-protection type switching station fault judging method according to claim 1 is characterized in that: described switch is a vacuum circuit-breaker, and the current start element is a current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101012389A CN100431233C (en) | 2006-07-06 | 2006-07-06 | Surface-protection type switching station fault judging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101012389A CN100431233C (en) | 2006-07-06 | 2006-07-06 | Surface-protection type switching station fault judging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1885663A true CN1885663A (en) | 2006-12-27 |
| CN100431233C CN100431233C (en) | 2008-11-05 |
Family
ID=37583684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101012389A Expired - Fee Related CN100431233C (en) | 2006-07-06 | 2006-07-06 | Surface-protection type switching station fault judging method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100431233C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895101A (en) * | 2010-07-09 | 2010-11-24 | 西安供电局 | Distributed station domain protecting method for switching station |
| CN102185298A (en) * | 2011-05-11 | 2011-09-14 | 吴登庆 | Relay protection method for power supply circuit based on communication network |
| CN102270835A (en) * | 2011-01-30 | 2011-12-07 | 武汉百叡电力技术有限公司 | Distributed over-current protection and interphase fault isolation method for distribution network |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001045645A (en) * | 1999-07-30 | 2001-02-16 | Central Res Inst Of Electric Power Ind | Wide-area protective system and method for electric power system and program recording medium |
| CN2638311Y (en) * | 2003-07-15 | 2004-09-01 | 河北冀能科技电力自动化设备有限公司 | Total automation device for transformer substation |
-
2006
- 2006-07-06 CN CNB2006101012389A patent/CN100431233C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895101A (en) * | 2010-07-09 | 2010-11-24 | 西安供电局 | Distributed station domain protecting method for switching station |
| CN102270835A (en) * | 2011-01-30 | 2011-12-07 | 武汉百叡电力技术有限公司 | Distributed over-current protection and interphase fault isolation method for distribution network |
| CN102185298A (en) * | 2011-05-11 | 2011-09-14 | 吴登庆 | Relay protection method for power supply circuit based on communication network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100431233C (en) | 2008-11-05 |
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