CN104142449A - Main transformer differential protection TA broken line simulation method - Google Patents
Main transformer differential protection TA broken line simulation method Download PDFInfo
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- CN104142449A CN104142449A CN201410377555.8A CN201410377555A CN104142449A CN 104142449 A CN104142449 A CN 104142449A CN 201410377555 A CN201410377555 A CN 201410377555A CN 104142449 A CN104142449 A CN 104142449A
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- Prior art keywords
- differential protection
- main transformer
- broken line
- phase
- phase current
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004088 simulation Methods 0.000 title abstract description 9
- 230000005611 electricity Effects 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- Protection Of Transformers (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a main transformer differential protection TA broken line simulation method, and belongs to the field of electricity. The problem that an existing main transformer differential protection TA broken line simulation process is complex and high in cost is solved. According to the technical scheme, the main transformer differential protection TA broken line simulation method mainly comprises the steps of adding a single-phase current I1 to a side Y0 to enable percentage differential protection to act, then adding a zero-sequence current with the three-phase amplitude being the I1 to the side Y0, changing the one-phase current or the two-phase current into 0, and obtaining a TA broken line through simulation, wherein at the moment, percentage differential protection does not act. The main transformer differential protection TA broken line simulation method is mainly used for transformer testing.
Description
Technical field
The present invention relates to transformer, particularly a kind of main transformer differential protection TA broken string analogy method.
Background technology
In order to simulate TA broken string, conventional method is that simulation actual motion occurs, before TA broken string, add at least six phase currents, and both sides add respectively three-phase current therein, and it is 0 that added these electric currents must make poor stream.Then, then disconnect at least 1～5 phase currents wherein, allow protective device judge TA broken string, thereby biased differential protection is blocked and is failure to actuate.The simulation of main transformer differential protection TA broken string realizes by " TA breakage lock device biased differential protection " in check protection device this function, and, in process of the test, when TA does not break, biased differential protection can move, and while breaking, is failure to actuate.In transformer differential protection, the criterion of TA broken string is generally: 1. occur before TA broken string, biased differential protection does not start, and poor stream is 0; 2. the electric current of at least one phase becomes suddenly 0, and other phase currents do not increase.So there is following defect in prior art: be 1,0 in order to make poor stream, must size and the phase place of both sides computed in advance electric current, and this work is not obviously simple thing very; 2, need to there is the test instrument of 6 phase current output functions, to having relatively high expectations of test instrument.If test instrument only has three-phase current output function, this test is difficult to do, or cannot do at all.
Summary of the invention
The object that the present invention will reach is just to provide a kind of main transformer differential protection TA broken string analogy method, simple, reduces experimentation cost, has reduced computing time, has improved test efficiency.
In order to achieve the above object, the present invention adopts following technical scheme: main transformer differential protection TA broken string analogy method, and first at Y
0side adds single-phase current I
1, make biased differential protection action, then at Y
0it is I that side adds three-phase amplitude
1zero-sequence current, then will be wherein one mutually or two-phase current become 0, can simulate TA broken string, biased differential protection now no longer moves.
Further, described single-phase current I
1amplitude maximal value be no more than Y
01.2 times of side rated current, single-phase current I
1amplitude minimum value be not less than the poor stream ratings of biased differential protection
doubly.
Adopt after technique scheme, tool of the present invention has the following advantages: the poor stream before simulation TA broken string is 0 o'clock, at Y
0side adds suitable three-phase zero-sequence current, and do not add forward-order current and negative-sequence current, in whole process of the test, only need add 3 phase currents, and do not need to add 6 phase currents, greatly simplify process of the test, and only needed the test instrument of 3 phase current output functions, compared with the test instrument with 6 phase current output functions, experimentation cost is much lower; Added three-phase amplitude is I
1zero-sequence current, the desirable scope of its amplitude is very wide, substantially need not calculate its bound.Therefore, reduced computing time.Improve test efficiency.
Embodiment
The invention provides main transformer differential protection TA broken string analogy method, first at Y
0side adds single-phase current I
1, make biased differential protection action, then at Y
0it is I that side adds three-phase amplitude
1zero-sequence current, then will be wherein one mutually or two-phase current become 0, can simulate TA broken string, biased differential protection now no longer moves.Described single-phase current I
1amplitude maximal value be no more than Y
01.2 times of side rated current, single-phase current I
1amplitude minimum value be not less than the poor stream ratings of biased differential protection
doubly.
In above-described embodiment; as long as the size to fit of zero-sequence current amplitude; be controlled between maximal value and minimum value; and scope between maximal value and minimum value is very wide, thus this two values generally do not calculated when test, but arbitrarily set an amplitude; if in TA when broken string, can not locking biased differential protection; the amplitude that is likely zero-sequence current is too large, can try to reduce the size of zero-sequence current amplitude, until can locking biased differential protection.
The present invention is only at Y
0side adds three-phase zero-sequence current, and can make poor stream is 0, has met criterion 1, and wherein a phase or two-phase current become 0, have met criterion 2.Qualified main transformer differential protection, must accomplish Y
0side adds three-phase zero-sequence current, and while not adding positive-sequence component and negative sequence component, poor stream is 0, the unexpected this point of general personnel.
Except above preferred embodiment, the present invention also has other embodiment, and those skilled in the art can make according to the present invention various changes and distortion, only otherwise depart from spirit of the present invention, all should belong to defined scope in the claims in the present invention book.
Claims (2)
1. main transformer differential protection TA broken string analogy method, is characterized in that: first at Y
0side adds single-phase current I
1, make biased differential protection action, then at Y
0it is I that side adds three-phase amplitude
1zero-sequence current, then will be wherein one mutually or two-phase current become 0, can simulate TA broken string, biased differential protection now no longer moves.
2. main transformer differential protection TA broken string analogy method according to claim 1, is characterized in that: described single-phase current I
1amplitude maximal value be no more than Y
01.2 times of side rated current, single-phase current I
1amplitude minimum value be not less than the poor stream ratings of biased differential protection
doubly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377555.8A CN104142449A (en) | 2014-08-01 | 2014-08-01 | Main transformer differential protection TA broken line simulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377555.8A CN104142449A (en) | 2014-08-01 | 2014-08-01 | Main transformer differential protection TA broken line simulation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104142449A true CN104142449A (en) | 2014-11-12 |
Family
ID=51851681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410377555.8A Pending CN104142449A (en) | 2014-08-01 | 2014-08-01 | Main transformer differential protection TA broken line simulation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104142449A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064689A (en) * | 2017-05-02 | 2017-08-18 | 许继电气股份有限公司 | A kind of analogy method and system of transformer TA broken strings |
-
2014
- 2014-08-01 CN CN201410377555.8A patent/CN104142449A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064689A (en) * | 2017-05-02 | 2017-08-18 | 许继电气股份有限公司 | A kind of analogy method and system of transformer TA broken strings |
| CN107064689B (en) * | 2017-05-02 | 2019-10-22 | 许继电气股份有限公司 | A kind of analogy method and system of transformer TA broken string |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141112 |
|
| RJ01 | Rejection of invention patent application after publication |