CN104242271A - Treatment method for 220 kV power grid line protection action refusing - Google Patents
Treatment method for 220 kV power grid line protection action refusing Download PDFInfo
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- CN104242271A CN104242271A CN201410481012.0A CN201410481012A CN104242271A CN 104242271 A CN104242271 A CN 104242271A CN 201410481012 A CN201410481012 A CN 201410481012A CN 104242271 A CN104242271 A CN 104242271A
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Abstract
The invention discloses a treatment method for 220 kV power grid line protection action refusing. According to the method, protection action conditions of opposite side transformer substations of all lines connected with a voltage failure bus and fault distance measuring information of all the lines connected with the voltage failure bus are collected, the actual lengths of all the lines connected with the voltage failure bus are obtained, when a fault point gets close to the substation, the protection range is from the whole length of the line to the next line whether it is zero sequence protection or distance protection, only the fault line distance measuring information is smaller than the whole length of the line, and then the position of the fault point is accurately learned through line length comparison; when the fault point gets close to opposite end substations, the fault line is within the current section protection range whether interphase short-circuiting or single phase earthing happens on the line, all the remaining protected lines are within a next section protection range, and through comparing protection information of all the opposite end substations, the place where the fault line is located is learned. The treatment method not only is suitable for a 220 kV line fault protection action refusing accident and can rapidly determine the line and equipment where the protection action refusing happens and the place where the fault point is located when other protection action refusing conditions happen inside a system.
Description
Technical field:
The present invention relates to a kind of processing method of 220kV power network line relay fail, belong to high-tension line maintenance maintenance field between regional power grid.
Background technology:
As the main high voltage interconnector between regional power grid, the importance of 220kV electric power system in electrical network is ineffable, ensures that its safe and stable operation is duty-bound for operation and dispatcher.When there is ground connection or phase fault in 220kV circuit; the main protection (optical-fiber longitudinal difference protection or carrier current protection) of this circuit or zero sequence, distance protection sense fault current; then protection exit action; this side switch of tripping circuit; excision electric network fault point, makes System recover normal operating condition.If but while line failure, there is switch failure or relay fail situation, relaying protection then cannot export action tripping faulty line switch, and causing trouble is bypassed the immediate leadership by this, thus expansion accident.
When the situation of circuit generation protective device relay fail; its result has two kinds (see Fig. 1): 1. fault point is near our station: after this side relay fail; will by the II section of action tripping of circuit A offside protective earthing distance to end switch; now fault point still exists; All other routes will flow into fault current by 220kV bus to fault point; therefore circuit B, C, D equally also will by the II section of action tripping of offside ground distance to end switch; cause all circuit decompressions of 220kV; main transformer high pressure dendrometry removes power supply, the situation of no-voltage of entire station will occur.2. fault point is near distance station: tripping situation appears in the protection of this side, equally by the II section of action of circuit A offside protective earthing distance, because now position of failure point has exceeded the protection range of circuit B, C, D opposite end ground distance II section, therefore will by ground distance III section of action tripping; Flow I period of time limit due to main transformer high-pressure side zero again and be less than III period of time limit of ground distance, so first flow I section of T1, T2 action by 1# main transformer high-pressure side zero to excise 220 and 221 switches respectively, now because 220 disconnect, 220kV I mother isolates in fault point, circuit B, D opposite end ground distance III segment protect can not start, and 220kV I is female thus can continue normal operation; Secondly, circuit C opposite end ground distance III section is by action tripping to end switch, and the female decompression of 220kV II, the female operation of 220kV system list in stand, because 110kV circuit is all feeder line, will to be stood load by 2# main transformer band entirely.
When line fault protection tripping will cause bus loss of pressure; specify according to " State Grid Corporation of China's power transformation operation code " and " schedule regulation "; when there is relay fail in circuit A; should first to disconnect on decompression bus connect all switches; secondly 220kV decompression bus is charged; after charging is normal; serve 1# main transformer; then combined floodgate test is carried out one by one to circuit; when combined floodgate flows I section by action again to 1# main transformer high-pressure side zero during faulty line; judge that this circuit is faulty line thus, this method is also referred to as " method is sent in examination ".But " method is sent in examination " not only length consuming time, program is numerous and diverse, more can the equipment such as switch, disconnecting link be made again to bear the impact of short circuit current in combined floodgate test, big self-evident to the damage of equipment.
Summary of the invention:
Technical problem to be solved by this invention is: the processing method providing a kind of 220kV power network line relay fail, by associated treatment, compare of analysis process, can accurately judge present position, fault point.
The technical scheme that the present invention takes for technical solution problem is:
A processing method for 220kV power network line relay fail, collects decompression bus institute and connects all circuit offside transforming plant protecting action situations and fault localization information, acquisition decompression bus connect all circuit physical lengths, its concrete treatment step is as follows:
1. fault point is near our station: decompression bus to connect all circuit offside switch protection action situations consistent, contrasted by the physical length of fault localization information and circuit, no matter be zero-sequenceprotection or distance protection, protection range is this total track length and is extended down to next circuit, faulty line ranging information is only had to be less than total track length, compared with ranging information by line length, accurately learn which bar circuit fault point is positioned on;
2. fault point is near distance station: no matter circuit generation phase fault or single-phase earthing; because of fault point near remote station time; faulty line is present segment protection range; all the other all protected circuits are hypomere protection range; by the contrast of each distance station protection information, Accurate Analysis is out of order circuit place.
Judge faulty line, exit this circuit re-switching, removed after disconnecting this line switching for subsequent use and do circuit peace arrange and switch peace arrange; After faulty line is isolated, recovers All other routes and power, exit all protections of faulty line and carry out process maintenance.
Operation principle of the present invention is as follows:
Distance protection utilizes impedance component to reflect the protective device of short circuit trouble point distance, wherein the impedance component reflection access voltage of this element and the ratio of electric current, namely reflects the resistance value of short circuit trouble point to protection installation place.When the resistance value measuring protection installation place to fault point is equal to or less than the setting value of relay, distance protection action outlet tripping operation.Distance protection generally forms by three sections, and the Ith section of impedance of adjusting is less, and operation time limit is the definite-time of impedance original paper, i.e. instantaneous operation; II, III section of resistance value of adjusting increases gradually, and operation time limit also increases gradually, adjusts the time limit respectively by the time relay.In the ordinary course of things, can only protect 80 ~ 85% of this total track length for the Ith section of distance protection, its operate time is intrinsic operate time of protective device.The protection range of the IIth section is this total track length and extends to a part for next section of circuit; it is the standby section of the Ith segment protect; be generally the total length of protected circuit and 30 ~ 40% of next total track length; its operation time limit will match with the operation time limit of next circuit distance protection the Ith section, is generally about 0.5s.IIIth section is the standby section of I, II segment protect, and it can be protected the total length of this circuit and next section of circuit and extend to a part for next section of circuit again, and its operation time limit is adjusted by ladder principle.In 220kV electric power system electrical network, transformer station is as node one by one, and these nodes are connected by circuit and form, when having an accident, if carry out associated treatment between node in time will greatly improve accident treatment efficiency by electrical network one by one.
When 220kV line fault during relay fail, should by an operations staff rapidly and dispatch contact collect decompression bus connect the protection act situation of the offside transformer station of all circuits and fault localization information; The decompression bus simultaneously looked into by protection scheme by another one operations staff connect the physical length of all circuits.1. when fault point is near our station, decompression bus to connect the offside switch protection action situation of all circuits (comprising faulty line) consistent, at this moment, can be contrasted by the physical length of fault localization information and circuit, no matter be zero-sequenceprotection or distance protection, the protection range of II segment protect is this total track length and is extended down to the part of next circuit, therefore the ranging information room of faulty line is only had to be less than total track length, the fault localization of all the other all circuits all will be greater than the physical length of this circuit, by comparing of line length and ranging information, accurately can learn which bar circuit fault point is positioned on.2. when fault point is near remote station; no matter circuit generation phase fault or single-phase earthing; except faulty line is still II segment protect action; all the other all circuits are because position of failure point exceeds distance II segment protect scope; the i.e. total length of protected circuit and 30 ~ 40% of next total track length; therefore will by the action of III of Distance segment protect, by the contrast of each distance station protection information, can Accurate Analysis to be out of order circuit place.
Therefore no matter in the face of which kind of fault type, position of failure point place can accurately be judged.Passive relative to " method is sent in examination " carry out for circuit tries to send one by one; advantage of the present invention is: after generation 220kV line fault protection tripping accident; the protection act situation of Duo Zuo transformer station is compared analysis by the angle standing in electrical network; not only can judge position of failure point place rapidly and accurately; more electric power feeding time can be saved; reach the object recovered as early as possible important customer power supply, not only ensure that the reliability of power network safety operation, more improve the economic benefit of company.After judging faulty line, exit this circuit re-switching, removed after disconnecting this line switching for subsequent use and do circuit peace arrange and switch peace arrange; After isolated fault circuit, just can recover the power supply of All other routes as early as possible, should exit all protections of faulty line afterwards, the personnel of notice come to process.
The present invention is not only applicable to 220kV line fault protection tripping accident; when there are other relay fail situations in system; adopt the method for associated treatment to gather corresponding failure amount to compare, just can determine rapidly the circuit of generation relay fail, equipment and place, fault point.
Accompanying drawing illustrates:
Fig. 1 is the structural principle schematic diagram of main electrical scheme operational mode in the present invention.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is made further explanation and description:
See Fig. 1; a kind of processing method of 220kV power network line relay fail; collect decompression bus institute and connect all circuit offside transforming plant protecting action situations and fault localization information, acquisition decompression bus connect all circuit physical lengths, its concrete treatment step is as follows:
1. fault point is near our station: decompression bus to connect all circuit offside switch protection action situations consistent, contrasted by the physical length of fault localization information and circuit, no matter be zero-sequenceprotection or distance protection, protection range is this total track length and is extended down to next circuit, faulty line ranging information is only had to be less than total track length, compared with ranging information by line length, accurately learn which bar circuit fault point is positioned on;
2. fault point is near distance station: no matter circuit generation phase fault or single-phase earthing; because of fault point near remote station time; faulty line is present segment protection range; all the other all protected circuits are hypomere protection range; by the contrast of each distance station protection information, Accurate Analysis is out of order circuit place.
After judging faulty line, exit this circuit re-switching, removed after disconnecting this line switching for subsequent use and do circuit peace arrange and switch peace arrange; After faulty line is isolated, recovers All other routes and power, exit all protections of faulty line and carry out process maintenance.
The present invention is not only applicable to 220kV line fault protection tripping accident; when there are other relay fail situations in system; adopt the method for associated treatment to gather corresponding failure amount to compare, just can determine rapidly the circuit of generation relay fail, equipment and place, fault point.
Claims (2)
1. a processing method for 220kV power network line relay fail, collects decompression bus institute and connects all circuit offside transforming plant protecting action situations and fault localization information, acquisition decompression bus connect all circuit physical lengths, its concrete treatment step is as follows:
1. fault point is near our station: decompression bus to connect all circuit offside switch protection action situations consistent, contrasted by the physical length of fault localization information and circuit, no matter be zero-sequenceprotection or distance protection, protection range is this total track length and is extended down to next circuit, faulty line ranging information is only had to be less than total track length, compared with ranging information by line length, accurately learn which bar circuit fault point is positioned on;
2. fault point is near distance station: no matter circuit generation phase fault or single-phase earthing; because of fault point near remote station time; faulty line is present segment protection range; all the other all protected circuits are hypomere protection range; by the contrast of each distance station protection information, Accurate Analysis is out of order circuit place.
2. the processing method of 220kV power network line relay fail according to claim 1, is characterized in that: judge faulty line, exits this circuit re-switching, removed after disconnecting this line switching for subsequent use and do circuit peace arrange and switch peace arrange; After faulty line is isolated, recovers All other routes and power, exit all protections of faulty line and carry out process maintenance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410481012.0A CN104242271A (en) | 2014-09-19 | 2014-09-19 | Treatment method for 220 kV power grid line protection action refusing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410481012.0A CN104242271A (en) | 2014-09-19 | 2014-09-19 | Treatment method for 220 kV power grid line protection action refusing |
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| CN104242271A true CN104242271A (en) | 2014-12-24 |
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| CN201410481012.0A Pending CN104242271A (en) | 2014-09-19 | 2014-09-19 | Treatment method for 220 kV power grid line protection action refusing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315096A (en) * | 2021-04-28 | 2021-08-27 | 华能(浙江)能源开发有限公司玉环分公司 | Water-oil-ash bus power loss processing method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359822A (en) * | 2008-09-24 | 2009-02-04 | 天津大学 | Transmission line single-phase adaptive reclosing implementing method based on fault point voltage |
| CN201478809U (en) * | 2009-07-23 | 2010-05-19 | 江苏省电力公司常州供电公司 | Single-phase grounding line selection device for 20 kV power grid |
-
2014
- 2014-09-19 CN CN201410481012.0A patent/CN104242271A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359822A (en) * | 2008-09-24 | 2009-02-04 | 天津大学 | Transmission line single-phase adaptive reclosing implementing method based on fault point voltage |
| CN201478809U (en) * | 2009-07-23 | 2010-05-19 | 江苏省电力公司常州供电公司 | Single-phase grounding line selection device for 20 kV power grid |
Non-Patent Citations (1)
| Title |
|---|
| 刘枫等: "浅析220KV线路保护拒动事故的处理方法", 《工矿自动化》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315096A (en) * | 2021-04-28 | 2021-08-27 | 华能(浙江)能源开发有限公司玉环分公司 | Water-oil-ash bus power loss processing method and system |
| CN113315096B (en) * | 2021-04-28 | 2022-01-25 | 华能(浙江)能源开发有限公司玉环分公司 | Water-oil-ash bus power loss processing method and system |
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Application publication date: 20141224 |
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