CN106772018A - The method of discrimination of one Ge Ban main electrical schemes transformer station dead-zone fault choosing string - Google Patents
The method of discrimination of one Ge Ban main electrical schemes transformer station dead-zone fault choosing string Download PDFInfo
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- CN106772018A CN106772018A CN201710034279.9A CN201710034279A CN106772018A CN 106772018 A CN106772018 A CN 106772018A CN 201710034279 A CN201710034279 A CN 201710034279A CN 106772018 A CN106772018 A CN 106772018A
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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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Abstract
The method of discrimination of one Ge Ban main electrical schemes transformer station dead-zone fault choosing string (breaker unit), is sampled by the three-phase current to whole transformer station each breaker；Using bus differential electric current selection fault bus region, syndrome serial positioning is carried out using circuit breaker current；For side breaker; compare the feature of bus differential electric current and the side circuit breaker current near bus; if bus differential electric current exists always; and a maximum side circuit breaker current is more than threshold values set in advance; then there is dead-zone fault in the side breaker, for middle breaker, if the circuit of certain breaker unit or tranformer protection tripping operation; but wherein circuit breaker current exists always, then in the string there is dead-zone fault in breaker.Reliability of the present invention is high, accurate positioning, as a result may apply in the breaker dead zone protection differentiation of station domain, shortens the fault clearing time of breaker dead zone protection, improves the security of bulk power grid power system.
Description
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
Flow the method for discrimination of the breaker dead-zone fault choosing string positioning of electric current.
Background technology
The contrary distribution feature of China's primary energy and electric load so that development is remote, the super extra-high voltage of Large Copacity
AC-HVDC technology turns into 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 new energy combination transition such as conventional energy resource and wind-powered electricity generation, photovoltaics.Alternating current-direct current distribution, microgrid are accessed and increased, and power network is multiple
Miscellaneous degree constantly strengthens.In AC and DC serial-parallel power grid, during receiving end ac short circuit failure, system voltage declines, and may trigger direct current
Commutation failure, while huge active, reactive power impact is caused to receiving end, can be delivered to sending end, serious conditions by energy impact
Under possibly even cause sending stability disruption.Quick 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, quick 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 can not quickly be cut off, and 7 times direct currents may be triggered to occur simultaneously continuously
Commutation failure, the transient state energy impact of generation is maximum up to 32,000,000 kilowatts, disconnected to sending end North China, Central China, southwestern power network exchange
Enormous impact is caused in face, causes transient state generator rotor angle unstability between electric power generator group, there is stabilization of power grids destruction risk.
, it is necessary to be protected by breaker fail protection action and dead band when the tripping of grid collapses breaker or dead-zone fault
Shield excision failure.At present, according to《220kV~750kV grid relay protective apparatus run code of adjusting》(DL/T559—2007)
Industry code requirements, the breaker fail protection actuation time of power system, general adjusting was 250ms, correspondingly failure and dead band
Fault clearing time needs to consider according to 0.45s.Stability Calculation check result shows, as shortened breaker failure and dead-zone fault
Mute time, the stability of a system will be effectively improved.Therefore, the fault location of research transformer station dead-zone fault, by comprehensive association
Corrective measure is adjusted, the fault clearing time of breaker dead-zone fault is compressed, it is significant to improving the stability of a system.
The content of the invention
The purpose of the present invention passes through the feature of bus differential electric current and breaker three-phase current during dead-zone fault, finds one
The method of discrimination of half main electrical scheme (i.e. 3/2 main electrical scheme) transformer station dead-zone fault choosing string positioning, so as 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 schemes transformer station dead-zone fault choosing string, it is characterised in that：
Using bus differential electric current selection fault bus region, syndrome serial positioning is carried out using circuit breaker current；According to disconnected
Road device current characteristic location dead area failure.
The method of discrimination of one Ge Ban main electrical schemes transformer station dead-zone fault choosing string, it is characterised in that described method include with
Lower step：
Step 1：The three-phase current of each breaker in Real-time Collection whole transformer station, and by acquired data storage in station domain
In protection device；
Step 2：Domain protection device of standing calculates three-phase current, the difference current of every section of bus of transformer station of each breaker, so
Enter step 3 afterwards；
Step 3：When difference current is more than bus protection difference current setting valve, then it is assumed that bus differential failure occurs,
Using bus differential electric current selection fault bus region, subsequently into step 4；Otherwise enter step 5；
Step 4：For each the breaker string between two buses, judge to be close to all side breakers of fault bus
Whether current value, finds out the maximum side breaker of current value, then judge this in circuit breaker current more than circuit breaker electric when presetting
Flow definite value and time delay reaches default time definite value, if in circuit breaker current more than circuit breaker current definite value and time delay when presetting
Default time definite value is reached, then judges that the side breaker has dead-zone fault, otherwise judge do not exist dead-zone fault；
Step 5：Determine whether that breaker string outlet is broken down trip protection, if it has, then enter step 6, otherwise
Return continues executing with step 3；
Step 6：Judge whether the middle circuit breaker current of the breaker string is more than default middle breaker current ration and continues
Up to default time definite value, if circuit breaker current is more than default middle breaker current ration in this and lasts up to the default time
Definite value, then judge that the middle breaker in the breaker string has dead-zone fault, otherwise judges this breaker string outlet failure not
There is dead-zone fault.
The present invention further includes following preferred scheme：
In step 2, described bus differential electric current is formed by bus, is calculated according to ABC three-phase currents split-phase：
Described difference current is calculated according to below equation：
idMXA=iAMX1+iAMX2+…+iAMXn (1)
idMXB=iBMX1+iBMX2+…+iBMXn (2)
idMXc=iCMX1+iCMX2+…+iCMXn (3)
Wherein：idNXA、idMXB、idMXcThe ABC phase difference currents of respectively bus MX, iAMXn iBMXn、iCMXnRespectively connect
The n-th branch road ABC phase currents on the bus are connected on, MX represents a Ge Ban main electrical schemes transformer station I buses or II buses.
In step 3, the bus protection difference current setting valve is adjusted by user, and span is 0.2~5In, In
To be connected to bis- rated current of branch road CT on bus.
In step 4, the default side circuit breaker current definite value span is 0.04In~2In, and In is side breaker
Bis- load current values of CT, the time limits are 0.1S~2S.Time definite value in step 4 is general adjust for
0.2S。
In step 6, the default middle breaker current ration span is 0.04In~2In, and In is middle breaker
Bis- load current values of CT, the time limits are 0.1S~2S.In step 6, general the adjusting of time definite value is 0.2S.
The present invention has following beneficial technique effect：Reliability of the present invention is high, accurate positioning, as a result may apply to station
During domain breaker dead zone protection differentiates, shorten the fault clearing time of breaker dead zone protection, improve bulk power grid power system
Security.
Brief description of the drawings
Fig. 1 is the main electrical scheme schematic diagram of typical transformer station one and half；Fig. 2 is one and half main electrical schemes power transformation disclosed by the invention
The method of discrimination schematic flow sheet of dead-zone fault of standing choosing string.
Specific embodiment
Technical scheme is described in further detail with reference to Figure of description.
Fig. 1 is the Typical Design for Substations of 500kV mono- and half, totally 4 string breaker unit, and breaker 5011,5012,5013 is
First string, 5021,5022,5023 is the second string, and 5031,5032,5033 is the 3rd string, and 5041,5042,5043 is the 4th string.
Often string breaker unit contains three groups of current transformers (CT), is configured 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 according to function need to be respectively connected to route protection, breaker protection,
Tranformer protection and bus protection, the actuating range of protection is border to access the Secondary Winding of current transformer.Breaker and
Region between current transformer is protection failure dead band, when the region is broken down, even if breaker tripping, cannot also be cut off
Failure is, it is necessary to all relative breakers could cut off failure around shunt tripping., the 5041st, 5042 and 5043 compositions are chosen in figure
4th string lists contacts with overseas parties part as typical case's string.
5011st, 5021,5031,5041 is I mothers side breaker, and 5013,5023,5033,5043 is II mothers side breaker, F1
Trouble point is that on I mother's buses, F2 trouble points are 5041 breaker dead bands, and F3 trouble points are 5043 breaker dead bands, F4 and F5 events
Breaker dead band in barrier point 5024.
Run according to existing protection《220kV~750kV grid relay protective apparatus run code of adjusting》(DL/
The Industry code requirements of T559-2007), it is necessary to by breaker failure when the tripping of grid collapses breaker or dead-zone fault
Protection act and dead zone protection excision failure, typical fault clearing time are more than 400ms, and threat power system stability even can
Bulk power grid can be caused to collapse.
The purpose of failure choosing string positioning is, when different faults position of the trouble point in F1, F2, F3, F4, correctly to select
Be out of order the main electrical scheme unit (string) at breaker and its place, for station domain protection's dead-zone decision logic provides foundation, shortening dead band
The mute time of protection is less than or equal to 200ms.
The method of discrimination flow that accompanying drawing 2 show Ge Ban main electrical schemes transformer station disclosed by the invention dead-zone fault choosing string is shown
It is intended to, the method for discrimination of one half main electrical scheme transformer station dead-zone fault choosing string is comprised the following steps：
Step 1：The three-phase current of each breaker in Real-time Collection whole transformer station, and by acquired data storage in station domain
In protection device；In Fig. 1 5011,5021,5031,5041,5012,5022,5032,5042,5013,5023,5033,5043
The current transformer three-phase current of each breaker will be gathered.
Step 2：Domain protection device of standing calculates three-phase current, the difference current of every section of bus of transformer station of each breaker, so
Enter step 3 afterwards；
The bus differential electric current that 500kVI is female in Fig. 1 and II is female, calculates according to ABC three-phase currents split-phase：
I mother's difference currents are calculated according to below equation：
idIA=iAI1+iAI2+iAI3+iAI4 (1)
idIB=iBI1+iBI2+iBI3+iBI4 (2)
idIc=iCI1+iCI2+iCI3+iCI4 (3)
Wherein：idIA、idIB、idIcRespectively bus I female ABC phase difference currents, iAIn、iBIn、iCInRespectively connect
The 1st~4 branch road ABC phase currents on the bus.
II mother's difference currents are calculated according to below equation：
idIIA=iAII1+iAII2+iAII3+iAII4 (4)
idIIB=iBII1+iBII2+iBII3+iBII4 (5)
idIIc=iCII1+iCII2+iCII3+iCII4 (6)
Wherein：idIIA、idIIB、idIIcRespectively bus II female ABC phase difference currents, iAIIn、iBIIn、iCIInRespectively
It is connected to the 1st~4 branch road ABC phase currents on the bus.
Step 3：When difference current is more than bus protection difference current setting valve, then it is assumed that bus differential failure occurs,
Using bus differential electric current selection fault bus region, subsequently into step 4；Otherwise enter step 5；In Fig. 1, first with mother
Line difference current selects fault zone, and when side breaker dead band F2 and F3 or bus F1 break down, bus differential electric current is more than
Bus protection difference current definite value, into step 4, when central breaker dead band F4 and F5 break down, I is female or mother II is differential
Electric current is less than bus protection difference current definite value, into step 5.
In step 3, the bus protection difference current setting valve is adjusted by user, and span is 0.2~5In, In
It is secondary rated current.
Step 4：For each the breaker string between two buses, judge to be close to all side breakers of fault bus
Whether current value, finds out the maximum side breaker of current value, then judge this in circuit breaker current more than circuit breaker electric when presetting
Flow definite value and time delay reaches default time definite value, if in circuit breaker current more than circuit breaker current definite value and time delay when presetting
Default time definite value is reached, then judges that the side breaker has dead-zone fault, otherwise judge do not exist dead-zone fault.
In Fig. 1, when F1 points break down, more than definite value, (user's I mother's difference currents adjusts, and the bus-bar system method of operation
Relevant, general range is 0.2~5In, and In is secondary rated current), the differential protection action of I mother's bus protections, breaker
5011st, 5021,5031,5041 tripping, failure removal.After breaker tripping, 5011,5021,5031,5041 current vanishes connect
Zero, I mother's difference currents are bordering on close to zero, in the absence of dead-zone fault.When F2 points break down, I mother's difference currents are more than definite value,
I mother's differential protection actions, the tripping of breaker 5011,5021,5031,5041.After breaker tripping, failure does not cut off, 5011,
5021st, close to zero, the electric current of side breaker 5041 and I mother's difference currents but exist 5031 current vanishes always, and 5041 sides are broken
Road device is maximum current, and can be more than the current ration adjusted in advance, when time definite value meets to be required, using dead zone protection
The 5012 of breaker 5042 and its circuit opposite end in tripping.
Similarly, during F3 point failures, failure dead band can be selected in 5043 II female breakers according to identical principle.
Wherein, the default side circuit breaker current definite value span is 0.04In~2In, and In is secondary rated current,
The time limits are 0.1S~2S, and it is 0.2S typically to adjust.
Step 5：Determine whether that breaker string outlet is broken down trip protection, if it has, then enter step 6, otherwise
Continue executing with step 3；
In Fig. 1, for middle breaker, when F5 dead-zone faults point breaks down, corresponding L1 route protections action sends jump
Can the protection of initiating station domain after lock order, although failure does not cut off, but tripping operation.
Step 6：Judge whether the middle circuit breaker current of the breaker string is more than default middle breaker current ration and continues
Up to default time definite value, if circuit breaker current is more than default middle breaker current ration in this and lasts up to the default time
Definite value, then judge that the middle breaker in the breaker string has dead-zone fault, otherwise judges this breaker string outlet failure not
There is dead-zone fault.
In Fig. 1, after domain protection of standing receives the order of circuit L1 tripping operations, can be with area by the route protection action message for defining
String where dividing trouble point, starts the current judgement for interrupting breaker 5042, because F5 trouble points exist always, middle circuit breaker current
It is adjacent disconnected by dead zone protection tripping always more than definite value (user adjusts, generally higher than 0.04In, and In is secondary rated current)
Road device 5043,2201 and 3501 cuts off failure.
Wherein, the default middle breaker current ration span is 0.04In~2In, and In is secondary rated current,
The time definite value is 0.1S~2S, and it is 0.2S typically to adjust.
So, no matter the trouble point of transformer station occurs in any position, and the 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 invention is not restricted to implementation detail provided above, can be in the case where feature of present invention not be departed from in addition
Embodiment realize.Therefore it provides embodiment should be considered as illustrative and not restrictive.Therefore, realize and
The use of possibility of the invention is defined by the appended claims.Thus, it is of the invention each by realizing of determining of claim
Planting selection includes that Equivalent embodiments fall within the scope of the present invention.
Claims (8)
1. the method for discrimination that Ge Ban main electrical schemes transformer station dead-zone fault choosing is gone here and there, it is characterised in that：
Using bus differential electric current selection fault bus region, syndrome serial positioning is carried out using circuit breaker current；According to breaker
Current characteristic location dead area failure.
2. the method for discrimination that Ge Ban main electrical schemes transformer station dead-zone fault choosing is gone here and there, it is characterised in that described method includes following
Step：
Step 1：The three-phase current of each breaker in Real-time Collection whole transformer station, and by acquired data storage in the protection of station domain
In device；
Step 2：Domain protection device of standing calculates three-phase current, the difference current of every section of bus of transformer station, Ran Houjin of each breaker
Enter step 3；
Step 3：When difference current is more than bus protection difference current setting valve, then it is assumed that bus differential failure occurs, utilize
Bus differential electric current selection fault bus region, subsequently into step 4；Otherwise enter step 5；
Step 4：For each the breaker string between two buses, the electric current of all side breakers near fault bus is judged
Value, finds out the maximum side breaker of current value, then judges whether this determines in circuit breaker current more than circuit breaker current when presetting
Value and time delay reaches default time definite value, if while circuit breaker current more than it is default while circuit breaker current definite value and time delay reach
Default time definite value, then judge that the side breaker has dead-zone fault, otherwise judges do not exist dead-zone fault；
Step 5：Determine whether that breaker string outlet is broken down trip protection, if it has, then entering step 6, otherwise return
Continue executing with step 3；
Step 6：Judge whether the middle circuit breaker current of the breaker string is more than default middle breaker current ration and lasts up to pre-
If time definite value, if circuit breaker current is more than breaker current ration in default in this and lasts up to the default time and determines
Value, then judge that the middle breaker in the breaker string has dead-zone fault, otherwise judges that this breaker string outlet failure is not deposited
In dead-zone fault.
3. the method for discrimination that the choosing of Ge Ban main electrical schemes transformer station according to claim 2 dead-zone fault is gone here and there, it is characterised in that：
In step 2, described bus differential electric current is formed by bus, is calculated according to ABC three-phase currents split-phase：
Described difference current is calculated according to below equation：
idMXA=iAMX1+iAMX2+…+iAMXn (1)
idMXB=iBMX1+iBMX2+…+iBMXn (2)
idMXc=iCMX1+iCMX2+…+iCMXn (3)
Wherein：idNXA、idMXB、idMXcThe ABC phase difference currents of respectively bus MX, iAMXn iBMXn、iCMXnRespectively it is connected to
The n-th branch road ABC phase currents on the bus, MX represents a Ge Ban main electrical schemes transformer station I buses or II buses.
4. the method for discrimination that the choosing of Ge Ban main electrical schemes transformer station according to claim 2 dead-zone fault is gone here and there, it is characterised in that：
In step 3, the bus protection difference current setting valve is adjusted by user, and span is 0.2~5In, and In is company
It is connected on bis- rated current of branch road CT on bus.
5. the method for discrimination that the choosing of Ge Ban main electrical schemes transformer station according to claim 2 dead-zone fault is gone here and there, it is characterised in that：
In step 4, the default side circuit breaker current definite value span is 0.04In~2In, and In is side breaker CT bis-
Secondary load current value, the time limits are 0.1S~2S.
6. the method for discrimination that the choosing of Ge Ban main electrical schemes transformer station according to claim 5 dead-zone fault is gone here and there, it is characterised in that：
Time fixed value adjusting in step 4 is 0.2S.
7. the method for discrimination that the choosing of Ge Ban main electrical schemes transformer station according to claim 2 dead-zone fault is gone here and there, it is characterised in that：
In step 6, the default middle breaker current ration span is 0.04In~2In, and In is middle breaker CT bis-
Secondary load current value, the time limits are 0.1S~2S.
8. the method for discrimination that the choosing of Ge Ban main electrical schemes transformer station according to claim 7 dead-zone fault is gone here and there, it is characterised in that：
In step 6, time fixed value adjusting is 0.2S.
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| CN201710034279.9A CN106772018B (en) | 2017-01-17 | 2017-01-17 | The method of discrimination of one Ge Ban main electrical scheme substation's dead-zone fault choosing string |
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| CN201710034279.9A CN106772018B (en) | 2017-01-17 | 2017-01-17 | The method of discrimination of one Ge Ban main electrical scheme substation's dead-zone fault choosing string |
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| CN106772018B CN106772018B (en) | 2019-08-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019417A (en) * | 2021-11-09 | 2022-02-08 | 国家电网有限公司西北分部 | Line protection current loop neutral line open circuit detection method |
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| 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 |
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| CN114019417A (en) * | 2021-11-09 | 2022-02-08 | 国家电网有限公司西北分部 | Line protection current loop neutral line open circuit detection method |
| CN114019417B (en) * | 2021-11-09 | 2022-05-31 | 国家电网有限公司西北分部 | Line protection current loop neutral line open circuit detection method |
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| CN106772018B (en) | 2019-08-27 |
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