CN106816862A - A kind of one-terminal data phase selection element based on voltage and non-faulting phase current - Google Patents
A kind of one-terminal data phase selection element based on voltage and non-faulting phase current Download PDFInfo
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Abstract
The present invention provides a kind of one-terminal data phase selection element based on voltage and non-faulting phase current, the phase selection element adapts to high resistance earthing fault, used cooperatively with distance protection, the phase selection element, including voltage phase selection part and electric current phase selection part, electric current phase selection part is using negative-sequence current as amount of polarization, the jump-value of current of failure phase is calculated using non-faulting phase current, using zero-sequence current, phase relation identification failure phase between forward-order current Sudden Changing Rate and negative-sequence current, simultaneously failure phase and non-faulting phase are distinguished using information of voltage amount, so as to realize accurately identifying failure phase, the correct operation that can realize high resistance earthing fault distance protection is used cooperatively with distance protection.
Description
Technical field
The present invention relates to relay protection of power system element, and in particular to one kind is based on voltage and non-faulting phase current
One-terminal data phase selection element.
Background technology
The performance of phase selection element governs the performance protected in the case of high resistance earthing fault, for distance
For protection, three jumping circuits are protected in phase selection failure, expand accident scope.
Existing phase-selecting method is coordinate subregion with negative-sequence current, and its phase selection region is：Advanced 75 °, delayed 45 °.
By taking A areas as an example,It is probably 3 kinds of fault types during positioned at A areas：A phases are grounded, BC two phase grounds and AB
Two-phase is through high resistance ground.It is grounded for A phases and there is larger difficulty through high resistance ground identification with AB two-phases.
Therefore, to overcome drawbacks described above, it is necessary to provide a kind of new phase selection element.
The content of the invention
The present invention proposes a kind of one-terminal data phase selection element based on voltage and non-faulting phase current, can accurately know
Other failure phase, being used cooperatively with distance protection can realize high resistance earthing fault distance protection correct operation.
A kind of one-terminal data phase selection element based on voltage and non-faulting phase current, including voltage phase selection part and electric current
Phase selection part.
The voltage phase selection part includes the voltage that following formula (1), (2) and (3) is represented：
|UBC cosφBC| ＞ | UA cosφA| (1)
|UAB cosφAB| ＞ | UC cosφC| (2)
|UCA cosφCA| ＞ | UB cosφB| (3)
Wherein, UA、UB、UCRespectively protect the phase voltage amplitude of installation place A, B, C three-phase；UAB、
UBC、UCARespectively protect installation place AB, BC, CA voltage between phases amplitude；
cosφABAfter compensationWithBetween included angle cosine value；
cosφBCAfter compensationWithBetween included angle cosine value；
cosφCAAfter compensationWithBetween included angle cosine value；
cosφAAfter compensationWithBetween included angle cosine value；
cosφBAfter compensationWithBetween included angle cosine value；
cosφCAfter compensationWithBetween included angle cosine value.
The electric current phase selection part negative-sequence current calculates the electricity of failure phase according to non-faulting phase current as amount of polarization
Stream Sudden Changing Rate, failure is recognized according to the phase relation between zero-sequence current, forward-order current Sudden Changing Rate and negative-sequence current
Phase,
The electric current phase selection part includes the electric current that following formula (4)~(12) represent：
Wherein,The phase current of protection installation place A, B, C three-phase is represented respectively,For protection is installed
Place's zero-sequence current,It is forward-order current of the protection installation place on the basis of A phases,It is to protect installation place with A
Negative-sequence current on the basis of phase；Protection installation place AB, BC, CA three-phase current is represented respectively；
It is forward-order current of the protection installation place on the basis of B phases,It is negative phase-sequence of the protection installation place on the basis of B phases
Electric current；It is forward-order current of the protection installation place on the basis of C phases,For protection installation place with C phases as base
Accurate negative-sequence current.
When meeting formula (2), formula (4) or formula (7), and meet formula (1) and formula 10) when, it is that A phases are grounded.
When meeting formula (1), formula (5) or formula (8), and it is that B phases are grounded when meeting formula (3) and formula (11).
When meeting formula (3), formula (6) or formula (9), and it is that C phases are grounded when meeting formula (2) and formula (12).
With immediate prior art ratio, technical scheme has following excellent effect：
(1) phase selection result is more accurate, and accurate phase selection result is more conducive to impedance computation and fault localization, reclosing
Deng；
(2) being used cooperatively with distance protection can realize high resistance earthing fault distance protection correct operation；
(3) only with single-end electrical quantity, with very strong practicality.
Brief description of the drawings
Fig. 1 is A phases phase selection logic of the invention；
Fig. 2 is B phases phase selection logic of the invention；
Fig. 3 is C phases phase selection logic of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention is further illustrated：
The present invention provides a kind of one-terminal data phase selection element based on voltage and non-faulting phase current, including voltage phase selection portion
Divide and electric current phase selection part.
The voltage phase selection part includes the voltage that following formula (1), (2) and (3) is represented：
|UBC cosφBC| ＞ | UA cosφA| (1)
|UAB cosφAB| ＞ | UC cosφC| (2)
|UCA cosφCA| ＞ | UB cosφB| (3)
Wherein, UA、UB、UCRespectively protect the phase voltage amplitude of installation place A, B, C three-phase；UAB、
UBC、UCARespectively protect installation place AB, BC, CA voltage between phases amplitude；cosφABAfter compensation
WithBetween included angle cosine value；cosφBCAfter compensationWithBetween included angle cosine value；cosφCAFor
After compensationWithBetween included angle cosine value；cosφAAfter compensationWithBetween included angle cosine value；
cosφBAfter compensationWithBetween included angle cosine value；cosφCAfter compensationWithBetween angle
Cosine value.
The electric current phase selection part includes the electric current that following formula (4)~(12) represent：
Wherein,It is protection installation place zero-sequence current,It is forward-order current of the protection installation place on the basis of A phases,It is negative-sequence current of the protection installation place on the basis of A phases；Respectively represent protection installation place AB,
BC, CA three-phase current；It is forward-order current of the protection installation place on the basis of B phases,It is protection installation place
Negative-sequence current on the basis of B phases；It is forward-order current of the protection installation place on the basis of C phases,To protect
Negative-sequence current of the shield installation place on the basis of C phases.
As shown in figure 1, working as | UAB cosφAB| ＞ | UC cosφC|、 Three any satisfactions of condition, and | UBC cosφBC| ＞ | UA cosφA|、When meeting simultaneously, it is judged as that A phases are grounded.
As shown in Fig. 2 working as | UBC cosφBC| ＞ | UA cosφA|、 Three any satisfactions of condition, and | UCA cosφCA| ＞ | UB cosφB|、When meeting simultaneously, it is judged as that B phases are grounded.
As shown in figure 3, working as | UCA cosφCA| ＞ | UB cosφB|、 Three any satisfactions of condition, and | UAB cosφAB| ＞ | UC cosφC|、When meeting simultaneously, it is judged as that C phases are grounded.
Performance is analyzed：
When so that A phases being grounded as an example, | UBC cosφBC| ＞ | UA cosφA|, Meet, it can be determined that for failure is mutually
A phases, when AB phases are grounded, | UAB cosφAB| ＞ | UC cosφC|、 It is unsatisfactory for, when BC phases are grounded, | UBC cosφBC| ＞ | UA cosφA| it is unsatisfactory for.
Finally it should be noted that：Above example is merely to illustrate technical scheme rather than it is protected
The limitation of scope, although being described in detail to the application with reference to above-described embodiment, art it is common
Technical staff should be understood：Those skilled in the art still can be to the specific embodiment of application after reading the application
A variety of changes, modification or equivalent, but these changes, modification or equivalent are carried out, in application
Within pending claims.
Claims (6)
1. a kind of one-terminal data phase selection element based on voltage and non-faulting phase current, it is characterised in that including voltage
Phase selection part and electric current phase selection part.
2. phase selection element as claimed in claim 1, it is characterised in that
The voltage phase selection part includes the voltage that following formula (1), (2) and (3) is represented：
|UBC cosφBC| ＞ | UA cosφA| (1)
|UAB cosφAB| ＞ | UC cosφC| (2)
|UCA cosφCA| ＞ | UB cosφB| (3)
Wherein, UA、UB、UCRespectively protect the phase voltage amplitude of installation place A, B, C three-phase；UAB、
UBC、UCARespectively protect installation place AB, BC, CA voltage between phases amplitude；
cosφAB：After compensationWithBetween included angle cosine value；
cosφBC：After compensationWithBetween included angle cosine value；
cosφCA：After compensationWithBetween included angle cosine value；
cosφA：After compensationWithBetween included angle cosine value；
cosφB：After compensationWithBetween included angle cosine value；
cosφC：After compensationWithBetween included angle cosine value.
3. phase selection element as claimed in claim 2, it is characterised in that electric current phase selection part negative phase-sequence electricity
Stream calculates the jump-value of current of failure phase according to non-faulting phase current, according to zero-sequence current, just as amount of polarization
Phase relation identification failure phase between sequence jump-value of current and negative-sequence current,
The electric current phase selection part includes the electric current that following formula (4)~(12) represent：
Wherein,The phase current of protection installation place A, B, C three-phase is represented respectively,Protection installation place
Zero-sequence current,Forward-order current of the protection installation place on the basis of A phases,Protection installation place is with A
Negative-sequence current on the basis of phase；Protection installation place AB, BC, CA three-phase current is represented respectively；
Forward-order current of the protection installation place on the basis of B phases,Negative phase-sequence electricity of the protection installation place on the basis of B phases
Stream；Forward-order current of the protection installation place on the basis of C phases,Protection installation place is on the basis of C phases
Negative-sequence current.
4. the one-terminal data phase selection element based on voltage and non-faulting phase current according to claim 3, its
It is characterised by,
When meeting formula (2), formula (4) or (7), and it is that A phases are grounded when meeting formula (1) and formula (10).
5. the one-terminal data phase selection element based on voltage and non-faulting phase current according to claim 3, its
It is characterised by,
When meeting formula (1), formula (5) or formula (8), and it is that B phases are grounded when meeting formula (3) and formula (11).
6. the one-terminal data phase selection element based on voltage and non-faulting phase current according to claim 3, its
It is characterised by,
When meeting formula (3), formula (6) or formula (9), and it is that C phases are grounded when meeting formula (2) and formula (12).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109038563A (en) * | 2018-08-13 | 2018-12-18 | 中国矿业大学(北京) | A kind of voltage sequence components phase-selecting method adapting to flexible DC transmission access |
| CN117406020A (en) * | 2023-10-19 | 2024-01-16 | 国网湖北省电力有限公司荆门供电公司 | Fault phase selection method for constructing generalized power ratio based on compensation abrupt quantity |
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| CN101038316A (en) * | 2007-04-23 | 2007-09-19 | 国电南京自动化股份有限公司 | Circuit protection order component phase selectiing method using both end information |
| CN101814730A (en) * | 2009-04-15 | 2010-08-25 | 河南省电力公司 | Fault phase selection method of double transmission line protection on the same pole |
| CN202855589U (en) * | 2012-07-11 | 2013-04-03 | 浙宝开关(杭州)有限公司 | Non-arcing switching device's phase selection controller |
| CN104267311A (en) * | 2014-09-12 | 2015-01-07 | 广东电网公司电力科学研究院 | Phase selection method for faults of double-circuit lines on same tower |
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| CN1396688A (en) * | 2002-08-26 | 2003-02-12 | 北京四方同创保护与控制设备有限公司 | Phase choosing method based on failed voltage comparison for judging the phase of failed phase current |
| CN101038316A (en) * | 2007-04-23 | 2007-09-19 | 国电南京自动化股份有限公司 | Circuit protection order component phase selectiing method using both end information |
| CN101814730A (en) * | 2009-04-15 | 2010-08-25 | 河南省电力公司 | Fault phase selection method of double transmission line protection on the same pole |
| CN202855589U (en) * | 2012-07-11 | 2013-04-03 | 浙宝开关(杭州)有限公司 | Non-arcing switching device's phase selection controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109038563A (en) * | 2018-08-13 | 2018-12-18 | 中国矿业大学(北京) | A kind of voltage sequence components phase-selecting method adapting to flexible DC transmission access |
| CN109038563B (en) * | 2018-08-13 | 2021-05-14 | 中国矿业大学(北京) | Voltage sequence component phase selection method capable of adapting to flexible direct current transmission access |
| CN117406020A (en) * | 2023-10-19 | 2024-01-16 | 国网湖北省电力有限公司荆门供电公司 | Fault phase selection method for constructing generalized power ratio based on compensation abrupt quantity |
| CN117406020B (en) * | 2023-10-19 | 2024-04-30 | 国网湖北省电力有限公司荆门供电公司 | Fault phase selection method for constructing generalized power ratio based on compensation abrupt quantity |
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