CN106772018B - The method of discrimination of one Ge Ban main electrical scheme substation's dead-zone fault choosing string - Google Patents

The method of discrimination of one Ge Ban main electrical scheme substation's dead-zone fault choosing string Download PDF

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CN106772018B
CN106772018B CN201710034279.9A CN201710034279A CN106772018B CN 106772018 B CN106772018 B CN 106772018B CN 201710034279 A CN201710034279 A CN 201710034279A CN 106772018 B CN106772018 B CN 106772018B
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breaker
current
dead
bus
zone
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CN106772018A (en
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宋小舟
秦红霞
张月品
彭世宽
余锐
娄霄楠
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Beijing Sifang Automation Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3275—Fault detection or status indication

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  • General Physics & Mathematics (AREA)
  • Protection Of Transformers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The method of discrimination of one Ge Ban main electrical scheme substation's dead-zone fault choosing string (breaker unit), is sampled by the three-phase current to each breaker of whole transformer station；Fault bus region is selected using bus differential electric current, carries out syndrome serial positioning using circuit breaker current；For side breaker; compare the feature of bus differential electric current and the side circuit breaker current close to bus; if bus differential electric current always exists; and a maximum side circuit breaker current is greater than preset threshold values; then there are dead-zone faults for the side breaker, for middle breaker, if the route of certain breaker unit or tranformer protection tripping; but wherein circuit breaker current always exists, then there are dead-zone faults for breaker in the string.As a result high reliablity of the present invention, accurate positioning can be applied in the domain breaker dead zone protection differentiation of station, shorten the fault clearing time of breaker dead zone protection, improve the safety of bulk power grid electric system.

Description

The method of discrimination of one Ge Ban main electrical scheme substation's dead-zone fault choosing string
Technical field
The present invention relates to field of relay protection in power, relate more specifically to based on bus differential electric current and side breaker The method of discrimination of the breaker dead-zone fault choosing string positioning of galvanic electricity stream.
Background technique
The contrary distribution feature of China's non-renewable energy and electric load, so that development is remote, the super extra-high voltage of large capacity AC and DC transmission technology becomes the fundamental realities of the country, the interconnected power grid that China's just walking conclusion of the business, direct current intercouple.With power supply Structure is to the new energy combination transition such as conventional energy resource and wind-powered electricity generation, photovoltaic.Alternating current-direct current distribution, microgrid access increase, and power grid is multiple Miscellaneous degree constantly enhances.In AC and DC serial-parallel power grid, when receiving end ac short circuit failure, system voltage decline may cause direct current Energy impact can be transmitted to sending end, serious conditions while causing huge active and reactive impact to receiving end by commutation failure Under possibly even cause sending stability disruption.Quickly protection belongs to the first line of defence of electricity net safety stable, current special In high voltage ac/dc serial-parallel power grid, due to the presence of direct-current commutation failure phenomenon, quickly protection reliably cuts off failure, and meaning is outstanding Its is great.Such as: the ac short circuit failure of East China Power Grid such as cannot quickly be cut off, and may be caused 7 times direct currents while be occurred continuous The transient state energy impact of commutation failure, generation is maximum up to 32,000,000 kilowatts, disconnected to sending end North China, Central China, southwestern power grid exchange Enormous impact is caused in face, leads to transient state generator rotor angle unstability between electric power generator group, and there are the stabilization of power grids to destroy risk.
When the tripping of grid collapses breaker or dead-zone fault, need to protect by breaker fail protection movement and dead zone Shield excision failure.Currently, according to " 220kV~750kV grid relay protective apparatus operation adjusting regulation " (DL/T559-2007) Industry code requirements, it is 250ms that the breaker fail protection actuation time of electric system, which generally adjusts, correspondingly failure and dead zone Fault clearing time needs consider according to 0.45s.Stability Calculation check result shows as shortened breaker failure and dead-zone fault Mute time, system stability will be effectively improved.Therefore, the fault location for studying substation's dead-zone fault is assisted by comprehensive Corrective measure is adjusted, the fault clearing time of breaker dead-zone fault is compressed, is of great significance to system stability is improved.
Summary of the invention
The feature of bus differential electric current and breaker three-phase current when the purpose of the present invention passes through dead-zone fault, finds one The method of discrimination of half main electrical scheme (i.e. 3/2 main electrical scheme) substation's dead-zone fault choosing string positioning, to compress breaker dead-zone fault Fault clearing time.
The present invention specifically uses following technical scheme.
The method of discrimination of one Ge Ban main electrical scheme substation's dead-zone fault choosing string, it is characterised in that:
Fault bus region is selected using bus differential electric current, carries out syndrome serial positioning using circuit breaker current；According to disconnected Road device current characteristic location dead area failure.
One Ge Ban main electrical scheme substation's dead-zone fault choosing string method of discrimination, which is characterized in that the method include with Lower step:
Step 1: acquiring the three-phase current of each breaker in whole transformer station in real time, and by acquired data storage in station domain In protective device；
Step 2: domain protective device of standing calculates the difference current of every section of three-phase current of each breaker, substation bus, so After enter step 3；
Step 3: when difference current is greater than bus protection difference current setting valve, then it is assumed that bus differential failure occurs, Fault bus region is selected using bus differential electric current, subsequently into step 4；Otherwise 5 are entered step；
Step 4: for each breaker string between two buses, judging all side breakers close to fault bus Current value finds out the maximum side breaker of current value, then judges the circuit breaker electric when whether circuit breaker current is greater than default It flows definite value and delay reaches the preset time definite value of corresponding sides breaker, if the circuit breaker electric when circuit breaker current is greater than default It flows definite value and delay reaches the preset time definite value of corresponding sides breaker, then judge that there are dead-zone faults for the side breaker, otherwise Dead-zone fault is not present in judgement；
Step 5: judging whether there is breaker string outlet and break down trip protection, if so, then entering step 6, otherwise Return continues to execute step 3；
Step 6: judging whether the middle circuit breaker current of the breaker string is greater than breaker current ration in default and continues Up to the preset time definite value of breaker in correspondence, if circuit breaker current is greater than breaker current ration in default and continues in this Up to the preset time definite value of breaker in correspondence, then there are dead-zone faults for the middle breaker for judging in the breaker string, otherwise sentence Dead-zone fault is not present in the breaker string outlet failure of breaking.
The present invention further comprises following preferred embodiment:
In step 2, the bus differential electric current is formed by bus, is calculated according to ABC three-phase current split-phase:
The difference current is calculated according to the following formula:
idMXA=iAMX1+iAMX2+…+iAMXn (1)
idMXB=iBMX1+iBMX2+…+iBMXn (2)
idMXC=iCMX1+iCMX2+···+iCMXn (3)
Wherein: idMXA、idMXB、idMXcThe ABC phase difference current of respectively bus MX, iAMXn iBMXn、iCMXnRespectively connect The n-th branch ABC phase current on the bus is connect, MX indicates a Ge Ban main electrical scheme substation I bus or II bus.
In step 3, the bus protection difference current setting valve is adjusted by user, and value range is 0.2~5In, In For bis- rated current of branch CT being connected on bus.
In step 4, the default side circuit breaker current definite value value range is 0.04In~2In, and In is side breaker Bis- load current values of CT, the preset time limits of the corresponding sides breaker are 0.1S~2S.Time in step 4 Definite value is generally adjusted as 0.2S.
In step 6, the default middle breaker current ration value range is 0.04In~2In, and In is middle breaker Bis- load current values of CT, the preset time definite value range of breaker is 0.1S~2S in the correspondence.In step 6, the time Definite value is generally adjusted as 0.2S.
The invention has the following beneficial technical effects: as a result high reliablity of the present invention, accurate positioning can be applied to station During domain breaker dead zone protection differentiates, shorten the fault clearing time of breaker dead zone protection, improves bulk power grid electric system Safety.
Detailed description of the invention
Fig. 1 is typical one and half main electrical scheme schematic diagram of substation；Fig. 2 is one and half main electrical schemes power transformation disclosed by the invention The method of discrimination flow diagram of dead-zone fault of standing choosing string.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawings of the specification.
Fig. 1 is mono- and half Typical Design for Substations of 500kV, and totally 4 string breaker unit, breaker 5011,5012,5013 are First string, 5021,5022,5023 be the second string, and 5031,5032,5033 be third string, and 5041,5042,5043 be the 4th string. Every string breaker unit contains three groups of current transformers (CT), configures according to 6-7-6, i.e. two side circuit breaker electric current transformers 6 Secondary winding, 7 secondary windings of middle breaker.Secondary winding needs to be respectively connected to route protection according to function, breaker is protected, Tranformer protection and bus protection, the actuating range of protection is to access the secondary winding of current transformer as boundary.Breaker and Region between current transformer is protection failure dead zone, when which breaks down, even if breaker tripping, can not also be cut off Failure needs all relative breakers around shunt tripping that could cut off failure., the 5041st, 5042 and 5043 compositions are chosen in figure 4th string lists externally connection part as typical string.
5011,5021,5031,5041 be mother I side breaker, and 5013,5023,5033,5043 be mother II side breaker, F1 Fault point is on mother's I bus, and the fault point F2 is 5041 breaker dead zones, and the fault point F3 is 5043 breaker dead zones, F4 and F5 event Breaker dead zone in barrier point 5024.
According to existing protection operation " 220kV~750kV grid relay protective apparatus operation adjusting regulation " (DL/T 559-2007) Industry code requirements when the tripping of grid collapses breaker or dead-zone fault, are needed by breaker failure Protection act and dead zone protection cut off failure, and typical fault clearing time is greater than 400ms, threaten power system stability even can Bulk power grid can be caused to collapse.
When the purpose of failure choosing string positioning is the different faults position when fault point in F1, F2, F3, F4, can correctly it select Be out of order the main electrical scheme unit (string) at breaker and its place, provides foundation for station domain protection's dead-zone decision logic, shortens dead zone The mute time of protection is less than or equal to 200ms.
The method of discrimination process that attached drawing 2 show Ge Ban main electrical scheme substation's dead-zone fault choosing string disclosed by the invention is shown Be intended to, one half main electrical scheme substation's dead-zone fault choosing string method of discrimination the following steps are included:
Step 1: acquiring the three-phase current of each breaker in whole transformer station in real time, and by acquired data storage in station domain In protective device；5011,5021,5031,5041,5012,5022,5032,5042,5013,5023,5033,5043 in Fig. 1 The current transformer three-phase current of each breaker will acquire.
Step 2: domain protective device of standing calculates the difference current of every section of three-phase current of each breaker, substation bus, so After enter step 3；
The bus differential electric current of 500kV mother I and II mother in Fig. 1 are calculated according to ABC three-phase current split-phase:
Mother's I difference current calculates according to the following formula:
idIA=iAI1+iAI2+iAI3+iAI4 (1)
idIB=iBI1+iBI2+iBI3+iBI4 (2)
idIc=iCI1+iCI2+iCI3+iCI4 (3)
Wherein: idIA、idIB、idIcThe respectively ABC phase difference current of bus I mother, iAIn、iBIn、iCInRespectively connect The 1st~4 branch ABC phase current on the bus.
Mother's II difference current calculates according to the following formula:
idIIA=iAII1+iAII2+iAII3+iAII4 (4)
idIIB=iBII1+iBII2+iBII3+iBII4 (5)
idIIc=iCII1+iCII2+iCII3+iCII4 (6)
Wherein: idIIA、idIIB、idIIcThe respectively ABC phase difference current of bus II mother, iAIIn、iBIIn、iCIInRespectively The 1st~4 branch ABC phase current being connected on the bus.
Step 3: when difference current is greater than bus protection difference current setting valve, then it is assumed that bus differential failure occurs, Fault bus region is selected using bus differential electric current, subsequently into step 4；Otherwise 5 are entered step；In Fig. 1, first with mother Line difference current selects fault zone, and when side breaker dead zone F2 and F3 or bus F1 break down, bus differential electric current is greater than Bus protection difference current definite value, enters step 4, when breaker dead zone F4 and F5 breaks down in the middle, I is female or mother II is differential Electric current is less than bus protection difference current definite value, enters step 5.
In step 3, the bus protection difference current setting valve is adjusted by user, and value range is 0.2~5In, In For secondary rated current.
Step 4: for each breaker string between two buses, judging all side breakers close to fault bus Current value finds out the maximum side breaker of current value, then judges the circuit breaker electric when whether circuit breaker current is greater than default It flows definite value and delay reaches preset time definite value, if circuit breaker current definite value and delay when circuit breaker current is greater than default Reach preset time definite value, then judging the side breaker, there are dead-zone faults, and otherwise dead-zone fault is not present in judgement.
In Fig. 1, when F1 point breaks down, mother's I difference current is greater than definite value (user's adjusting and the bus-bar system method of operation Related, general range is 0.2~5In, and In is secondary rated current), the differential protection movement of mother's I bus protection, breaker 5011,5021,5031,5041 tripping, failure removal.After breaker tripping, 5011,5021,5031,5041 current vanishes are connect Zero, I mother difference current is bordering on close to zero, dead-zone fault is not present.When F2 point breaks down, mother's I difference current is greater than definite value, The movement of mother's I differential protection, 5011,5021,5031,5041 tripping of breaker.After breaker tripping, failure is not cut off, 5011, 5021, close to zero, 5041 electric current of side breaker and mother's I difference current but always exist 5031 current vanishes, and 5041 sides are disconnected Road device is maximum current, and can be greater than the current ration adjusted in advance and utilize dead zone protection when time definite value is met the requirements The 5012 of breaker 5042 and its route opposite end in tripping.
Similarly, when F3 point failure, failure dead zone can be selected in 5043 breakers of II mother according to identical principle.
Wherein, the default side circuit breaker current definite value value range is 0.04In~2In, and In is secondary rated current, The time definite value range is 0.1S~2S, and general adjusting is 0.2S.
Step 5: judging whether there is breaker string outlet and break down trip protection, if so, then entering step 6, otherwise Continue to execute step 3；
In Fig. 1, for middle breaker, when F5 dead-zone fault point breaks down, corresponding L1 route protection movement is issued and is jumped Lock order will start the protection of station domain although failure is not cut off after tripping.
Step 6: judging whether the middle circuit breaker current of the breaker string is greater than breaker current ration in default and continues Up to preset time definite value, if circuit breaker current is greater than breaker current ration in default and lasts up to the preset time in this Definite value, then there are dead-zone faults for the middle breaker for judging in the breaker string, otherwise judge the secondary breaker string outlet failure not There are dead-zone faults.
It, can be with area by the route protection action message of definition after domain protection of standing receives the order of route L1 tripping in Fig. 1 The current judgement of breaker 5042, since the fault point F5 always exists, middle circuit breaker current are interrupted in string where dividing fault point, starting It is always more than definite value (user's adjusting, generally higher than 0.04In, In are secondary rated current), it is adjacent disconnected by dead zone protection tripping Road device 5043,2201 and 3501 cuts off failure.
Wherein, the default middle breaker current ration value range is 0.04In~2In, and In is secondary rated current, The time definite value is 0.1S~2S, and general adjusting is 0.2S.
So no matter the fault point of substation occurs in any position, this method can distinguish syndrome serial and failure side Breaker.
Above description provides implementation method of the invention simply by means of embodiment.It is aobvious for those skilled in the art And be clear to, the present invention is not limited to implementation details provided above, can be in the case where not departing from feature of present invention in addition Embodiment realize.Therefore it provides embodiment should be considered illustrative and not restrictive.Therefore, realize and It the use of a possibility that present invention is defined by the appended claims.Thus, the realization determined by claim is of the invention each Kind selection includes that equivalent embodiment also belongs to the scope of the present invention.

Claims (7)

1. the method for discrimination of Ge Ban main electrical scheme substation's dead-zone fault choosing string, which is characterized in that the method includes following Step:
Step 1: acquiring the three-phase current of each breaker in whole transformer station in real time, and acquired data storage is protected in station domain In device；
Step 2: domain protective device of standing calculates the difference current of every section of three-phase current of each breaker, substation bus, then into Enter step 3；
Step 3: when difference current is greater than bus protection difference current setting valve, then it is assumed that bus differential failure occurs, utilizes Bus differential electric current selects fault bus region, subsequently into step 4；Otherwise 5 are entered step；
Step 4: for each breaker string between two buses, judging the electric current of all side breakers close to fault bus Value, finds out the maximum side breaker of current value, then judges that the circuit breaker current when whether circuit breaker current is greater than default is fixed Value and delay reaches the preset time definite value of corresponding sides breaker, if circuit breaker current is fixed when circuit breaker current is greater than default Value and delay reach the preset time definite value of corresponding sides breaker, then judge that there are dead-zone faults for the side breaker, otherwise judge There is no dead-zone faults；
Step 5: judging whether there is the breaker string outlet trip protection that breaks down and otherwise returned if so, then entering step 6 Continue to execute step 3；
Step 6: judging whether the middle circuit breaker current of the breaker string is greater than in default breaker current ration and lasts up to pair The preset time definite value of middle breaker is answered, if circuit breaker current is greater than in default breaker current ration and lasts up to pair in this The preset time definite value of middle breaker is answered, then judging middle breaker in the breaker string, there are dead-zone faults, and otherwise judgement should Dead-zone fault is not present in breaker string outlet failure.
2. the method for discrimination of Ge Ban main electrical scheme substation's dead-zone fault choosing string according to claim 1, it is characterised in that:
In step 2, the bus differential electric current is formed by bus, is calculated according to ABC three-phase current split-phase:
The difference current is calculated according to the following formula:
idMXA=iAMX1+iAMX2+···+iAMXn(1)
idMXB=iBMX1+iBMX2+···+iBMXn(2)
idMXC=iCMX1+iCMX2+···+iCMXn(3)
Wherein: idMXA、idMXB、idMXC The ABC phase difference current of respectively bus MX, iAMXn iBMXn、iCMXnRespectively it is connected to The n-th branch ABC phase current on the bus, MX indicate a Ge Ban main electrical scheme substation I bus or II bus.
3. the method for discrimination of Ge Ban main electrical scheme substation's dead-zone fault choosing string according to claim 1, it is characterised in that:
In step 3, the bus protection difference current setting valve is adjusted by user, and value range is 0.2~5In, and In is to connect Connect bis- rated current of branch CT on bus.
4. the method for discrimination of Ge Ban main electrical scheme substation's dead-zone fault choosing string according to claim 1, it is characterised in that:
In step 4, the default side circuit breaker current definite value value range is 0.04In~2In, and In is side breaker CT bis- Secondary load current value, the preset time definite value range of corresponding sides breaker are 0.1S~2S.
5. the method for discrimination of Ge Ban main electrical scheme substation's dead-zone fault choosing string according to claim 4, it is characterised in that:
The preset time definite value adjusting of corresponding sides breaker in step 4 is 0.2S.
6. the method for discrimination of Ge Ban main electrical scheme substation's dead-zone fault choosing string according to claim 1, it is characterised in that:
In step 6, the default middle breaker current ration value range is 0.04In~2In, and In is middle breaker CT bis- Secondary load current value, the preset time definite value range of breaker is 0.1S~2S in the correspondence.
7. the method for discrimination of Ge Ban main electrical scheme substation's dead-zone fault choosing string according to claim 6, it is characterised in that:
In step 6, the preset time definite value adjusting of breaker is 0.2S in corresponding to.
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CN101355247A (en) * 2008-08-08 2009-01-28 国网电力科学研究院 Method for recognizing non-integrity string running mode under half circuit breaker connection mode
CN102629754A (en) * 2012-03-31 2012-08-08 积成电子股份有限公司 Substation area back-up protecting method based on current differential principle
CN103389422A (en) * 2013-07-19 2013-11-13 国家电网公司 Method for detecting non-fault phase busbar differential protection maloperation cause during circuit reclosing period

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Publication number Priority date Publication date Assignee Title
CN101349724A (en) * 2007-07-17 2009-01-21 中国二十冶建设有限公司 Large-scale transformer differential protective system test method
CN101355247A (en) * 2008-08-08 2009-01-28 国网电力科学研究院 Method for recognizing non-integrity string running mode under half circuit breaker connection mode
CN102629754A (en) * 2012-03-31 2012-08-08 积成电子股份有限公司 Substation area back-up protecting method based on current differential principle
CN103389422A (en) * 2013-07-19 2013-11-13 国家电网公司 Method for detecting non-fault phase busbar differential protection maloperation cause during circuit reclosing period

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