CN109782125A - A kind of earth-free Single-phase Earth Fault of Power System identification and partition method - Google Patents
A kind of earth-free Single-phase Earth Fault of Power System identification and partition method Download PDFInfo
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- CN109782125A CN109782125A CN201811587303.2A CN201811587303A CN109782125A CN 109782125 A CN109782125 A CN 109782125A CN 201811587303 A CN201811587303 A CN 201811587303A CN 109782125 A CN109782125 A CN 109782125A
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Abstract
The invention discloses a kind of earth-free Single-phase Earth Fault of Power System identification and partition methods, are embodied as increasing low voltage test function in corresponding control protective unit, specifically include: line switching, isolation switch are in closing position；By choosing 10kV route phase voltage virtual valueMinimum value again is compared with voltage definite value, if the former is less than the latter, ground fault occurs in judgement, is delayed by setting, and low voltage test function action tripping switchs；By choosing 10kV route phase voltage virtual valueMaximum value again, when the former is less than the latter, low voltage test function is latched compared with voltage definite value, is avoided exception in short-term and is caused function action.
Description
Technical field
The present invention relates to electric power system fault processing technology field more particularly to a kind of earth-free electric system single-phase earthings
Fault identification and partition method.
Background technique
As high voltage dc transmission technology is using more and more extensive, the nationwide interior high voltage direct current transmission run
It stands more and more, proportion is also increasing in the power system for DC transmission engineering, and operational reliability is to electric system
Security and stability have vital effect.The auxiliary equipment such as valve cooling system are one for influencing converter station operational reliability
Key factor, to the operational reliability of station power use system, more stringent requirements are proposed as a result,.
Some converter stations are limited by geographical conditions, stand in need to be evacuated to from farther away water source by multi-level water pump house with water
Pond is stored in standing, this just needs to draw feeder line supply pump house in slave station.Length to outer pump house feeder line of standing is longer, operation
Condition is also very severe, and the probability to break down is larger.Currently, prepared auto restart logic in the station power consumption control system of some converter stations
It is directly to use phase voltage as criterion, and 10kV station power use system is often isolated neutral system, occurs when to the feeder line outside station
When singlephase earth fault, the route overcurrent protection of configuration will not act excision failure, this will cause 10kV bus in joined station
Voltage reduce, cause prepared auto restart act perseveration, and ultimately cause 10kV bus incoming switch, block switch simultaneously switches off
Bus loss of pressure phenomenon.This causes great threat to the operation of the important loads such as converter station valve cooling system, may cause when serious
Direct current is stopped transport, and consequence is serious.
Summary of the invention
The purpose of the present invention is overcoming above-mentioned the deficiencies in the prior art, a kind of earth-free electric system single-phase earthing event is provided
Barrier identification and partition method.
The present invention is achieved through the following technical solutions: a kind of earth-free Single-phase Earth Fault of Power System identification with
Partition method includes the following steps:
(1) 10kV route phase voltage is acquired, and calculates its virtual valueTimes；
(2) three-phase line phase voltage virtual value is takenMinimum value and maximum value again, is denoted as U_MIN, U_MAX respectively；
(3) voltage definite value U_SET is taken, which can matching relationship setting according to actual needs；
(4) U_MIN is compared with U_SET, as U_MIN < U_SET, then judges that route has singlephase earth fault；
(5) U_MAX is compared with U_SET, as U_MAX < U_SET, then judges that low voltage test function is closed
Lock；
(6) " closing position " signal of line segregation switch, " closing position " signal of line segregation disconnecting link are obtained；
(7) low voltage test function action: when in U_MAX < U_SET in U_MIN < U_SET in (4), (5) and (6)
" closing position " gets " closing position " signal of line segregation switch and " closing position " signal three of line segregation disconnecting link
When a condition meets simultaneously, by the delay of time T, low voltage test function action；
(8) it low voltage test function action consequence: disconnects and is detected interval switch.
By above step, can be moved in earth-free circuit on power system singlephase earth fault by low voltage test function
Make excision failure；In step (4), there is ground fault in judgement, is delayed by setting, and low voltage test function action tripping is opened
It closes；Low voltage test function is latched as U_MAX < U_SET in step (5), malfunction can be caused to avoid abnormal in short-term.It is right
Isolated neutral system, when detecting that route phase voltage reduces and lower than setting value in normal course of operation, other two-phase voltage liters
It is high and when being higher than setting value, judge that singlephase earth fault occurs for the route, be delayed tripping line switching by setting, isolation therefore
Barrier.
It is compared with the prior art, the present invention has the advantages that this method principle is simple, is easily achieved；Realize earth-free electricity
The identification of Force system singlephase earth fault be isolated.
Detailed description of the invention
Fig. 1 is the logic chart of low voltage test of embodiment of the present invention function；
Fig. 2 is the Example logic that the embodiment of the present invention increases low voltage test function in Converter Station power consumption control system
Figure.
Specific embodiment
The contents of the present invention are described in further details with reference to the accompanying drawings and detailed description.
Embodiment
Refering to fig. 1, it is a kind of earth-free Single-phase Earth Fault of Power System identification and partition method, in corresponding control or protects
Low voltage test function is arranged in protection unit logic, and (this place " low voltage test function " is function title, low in specific logic
Voltage criterion can be according to practical adjusting), include the following steps:
(1) 10kV route phase voltage is acquired, and calculates its virtual valueTimes；
(2) three-phase line phase voltage virtual value is takenMinimum value and maximum value again, is denoted as U_MIN, U_MAX respectively；
(3) voltage definite value U_SET is taken, which can matching relationship setting according to actual needs；
(4) U_MIN is compared with U_SET, as U_MIN < U_SET, then judges that route has singlephase earth fault；
(5) U_MAX is compared with U_SET, as U_MAX < U_SET, then judges that low voltage test function is closed
Lock；
(6) " closing position " signal of line segregation switch, " closing position " signal of line segregation disconnecting link are obtained；
(7) low voltage test function action: when in U_MAX < U_SET in U_MIN < U_SET in (4), (5) and (6)
" closing position " gets " closing position " signal of line segregation switch and " closing position " signal three of line segregation disconnecting link
When a condition meets simultaneously, by the delay of time T, low voltage test function action；
(8) it low voltage test function action consequence: disconnects and is detected interval switch.
By above step, can be moved in earth-free circuit on power system singlephase earth fault by low voltage test function
Make excision failure；In step (4), there is ground fault in judgement, is delayed by setting, and low voltage test function action tripping is opened
It closes；Low voltage test function is latched as U_MAX < U_SET in step (5), malfunction can be caused to avoid abnormal in short-term.It is right
Isolated neutral system, when detecting that route phase voltage reduces and lower than setting value in normal course of operation, other two-phase voltage liters
It is high and when being higher than setting value, judge that singlephase earth fault occurs for the route, be delayed tripping line switching by setting, isolation therefore
Barrier.
Referring to Fig.2, BUS101_U_RMS is 10kV#101M bus phase voltage virtual value in embodiment in figureTimes, it is
The example that south electric network Converter Station power consumption control system specifically utilizes low voltage test function, the converter station is with water by station
Outer three-level pump house from waterworks extract, stand in 10kV#101M, #102M pass through respectively 1106DL, 1206DL switch to stand
The route of outer pump house provides power supply.It is the common-tower double-return metal bare conductor that cement pole is set up to outer route of standing, double loop is a length of
18.6km, harsh environmental conditions, line fault probability are high along the line.After singlephase earth fault occurs for route, the route of configuration
Akinesia is protected to cut off failure, failure will cause to stand interior 10kV prepared auto restart perseveration and eventually lead to 10kV where feeder line
Bus loss of pressure.
The present embodiment, which proposes, eliminates measure of the outer line fault to 10kV bus operation adverse effect in standing of standing: (1) energy
It is enough that line fault is cut off by increased low voltage test function in the power consumption control system of station；(2) low voltage test function passes through
Choosing suitable time definite value (in embodiment for 1000ms) can act that (prepared auto restart judges voltage in embodiment prior to prepared auto restart
The time of decompression is 1800ms) come eliminate influence to the outer feeder fault of standing to station power use system operational reliability, in route phase
Between short trouble when the route protection that configures first act (route operating time of protection is 0.8s in embodiment), while not influencing again
Backup power automatic switching function；(3) by taking three-phase bus voltage effective valueTimes maximum value (be in embodiment with voltage definite value
It 8.5kV) compares, when the former is less than the latter, low voltage test function is blocked, this is the mistake for being avoided normally switching station electricity consumption
Feeder switch (switching in example for 1106DL) disconnects outside the near station of the function action in journey.
Present embodiment illustrates Converter Station electricity systems because leading to bus loss of pressure to outer Feeder of standing
Solution.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment is not to limit this hair
Bright the scope of the patents, all equivalence enforcements or change without departing from carried out by the present invention, is intended to be limited solely by the scope of the patents of this case.
Claims (1)
1. a kind of earth-free Single-phase Earth Fault of Power System identification and partition method, it is characterised in that include the following steps:
(1) 10kV route phase voltage is acquired, and calculates its virtual valueTimes；
(2) three-phase line phase voltage virtual value is takenMinimum value and maximum value again, is denoted as U_MIN, U_MAX respectively；
(3) voltage definite value U_SET is taken, which can matching relationship setting according to actual needs；
(4) U_MIN is compared with U_SET, as U_MIN < U_SET, then judges that route has singlephase earth fault；
(5) U_MAX is compared with U_SET, as U_MAX < U_SET, then judges that low voltage test function is blocked；
(6) " closing position " signal of line segregation switch, " closing position " signal of line segregation disconnecting link are obtained；
(7) it low voltage test function action: " closes a floodgate when in U_MAX < U_SET in U_MIN < U_SET in (4), (5) and (6)
Position " gets " closing position " signal of line segregation switch and three conditions of " closing position " signal of line segregation disconnecting link
When meeting simultaneously, by the delay of time T, low voltage test function action；
(8) it low voltage test function action consequence: disconnects and is detected interval switch.
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| CN201811587303.2A CN109782125A (en) | 2018-12-25 | 2018-12-25 | A kind of earth-free Single-phase Earth Fault of Power System identification and partition method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110676823A (en) * | 2019-11-28 | 2020-01-10 | 国网江苏省电力有限公司镇江供电分公司 | 110kV line disconnection relay protection method |
| CN110729709A (en) * | 2019-11-28 | 2020-01-24 | 国网江苏省电力有限公司镇江供电分公司 | 110kV line disconnection relay protection method for measuring neutral point voltage of transformer |
| CN110829390A (en) * | 2019-11-28 | 2020-02-21 | 国网江苏省电力有限公司镇江供电分公司 | 110kV wire break protection method for measuring load side voltage and matching with spare power automatic switching |
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| CN102005741A (en) * | 2010-10-29 | 2011-04-06 | 华北电力大学 | Distribution network line single phase earthing fault diagnosis and isolation method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110676823A (en) * | 2019-11-28 | 2020-01-10 | 国网江苏省电力有限公司镇江供电分公司 | 110kV line disconnection relay protection method |
| CN110729709A (en) * | 2019-11-28 | 2020-01-24 | 国网江苏省电力有限公司镇江供电分公司 | 110kV line disconnection relay protection method for measuring neutral point voltage of transformer |
| CN110829390A (en) * | 2019-11-28 | 2020-02-21 | 国网江苏省电力有限公司镇江供电分公司 | 110kV wire break protection method for measuring load side voltage and matching with spare power automatic switching |
| CN110829390B (en) * | 2019-11-28 | 2020-11-10 | 国网江苏省电力有限公司镇江供电分公司 | 110kV wire break protection method for measuring load side voltage and matching with spare power automatic switching |
| CN110729709B (en) * | 2019-11-28 | 2020-12-15 | 国网江苏省电力有限公司镇江供电分公司 | 110kV line disconnection relay protection method for measuring neutral point voltage of transformer |
| CN110676823B (en) * | 2019-11-28 | 2021-03-02 | 国网江苏省电力有限公司镇江供电分公司 | 110kV line disconnection relay protection method |
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Application publication date: 20190521 |