CN101907670A - Method for verifying correctness of transformer differential protection secondary connection loop - Google Patents
Method for verifying correctness of transformer differential protection secondary connection loop Download PDFInfo
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- CN101907670A CN101907670A CN 201010211397 CN201010211397A CN101907670A CN 101907670 A CN101907670 A CN 101907670A CN 201010211397 CN201010211397 CN 201010211397 CN 201010211397 A CN201010211397 A CN 201010211397A CN 101907670 A CN101907670 A CN 101907670A
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- 238000012795 verification Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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Abstract
The invention discloses a method for verifying correctness of a transformer differential protection secondary connection loop, which comprises the following steps of: completing the secondary connection of a main transformer differential protection loop, carrying out three-phase short circuiting on a main transformer low-voltage side, applying a 100-500 V three-phase alternating-current voltage to a main transformer high-voltage side, judging whether the connection of a differential protection circuit is correct or not according to the result whether a differential current is generated in the main transformer differential protection loop, judging that the connection of the differential protection circuit is not correct when the differential current passes through the differential protection circuit, and judging that the connection of the differential protection circuit is correct when no differential current passes through the differential protection circuit. Therefore, by the invention, the real running condition of the transformer put into operation can be simulated, and the problem that a transformer is possibly paused to replace the connection of the secondary loop is avoided when the load test is carried out on the transformer differential protection to verify the correctness of the differential loop or the connection of the differential loop is incorrect after the transformer is put into operation.
Description
Technical field
The present invention relates to a kind of method of verification correctness of transformer differential protection secondary connection loop.
Background technology
Whether transformer differential protection circuit connection correctness, is the important prerequisite of differential protection action.If the differential protection loop wiring is incorrect, during the main transformer troubles inside the sample space, protection can not be moved, and might just cause the damage of main transformer.Consequence is very serious.
The verification mode of the secondary circuit of main transformer differential protection at present: become example with 35kV/10kV two circles, main transformer high and low pressure side CT (current transformer) termination of the same name is gone into same differential protection loop.Earlier the differential protection secondary loop is connected; after sending electricity Deng main transformer; main transformer differential protection pressing plate is withdrawed from; under the situation of main transformer on-load, differential protection loop is carried out the on-load test; if the differential protection wiring is correct; then do not have spill current (being that spill current is generally less than 0.03A) in the differential protection loop, differential protection just can normally move.Hence one can see that, and there is following shortcoming in the method that adopts now: can not simulate the actual motion state of differential protection, just test the connection situation of the polarity secondary circuit of CT; Can not carry out an overall verification to two current returns of protection loop integral body in addition.
Summary of the invention
The present invention is directed to the deficiencies in the prior art; a kind of method for verifying correctness of transformer differential protection secondary connection loop is provided; it is by with the short circuit of main transformer low-pressure side, and applies certain magnitude of voltage in the high-pressure side, judges as long as this magnitude of voltage guarantees to carry out differential protection polarity.
For realizing above technical purpose, the present invention will take following technical scheme:
A kind of method for verifying correctness of transformer differential protection secondary connection loop, may further comprise the steps: after protecting the loop secondary connection to connect main transformer differential, earlier the main transformer low-pressure side is carried out three-phase shortcircuit, then apply the three-phase alternating voltage of 100～500V in the main transformer high-pressure side, then according to whether having difference current to pass through in the main transformer differential protection loop, whether correct with the wiring of judging the differential protection circuit, when having difference current to pass through in the differential holding circuit, the wiring that shows the differential protection circuit is incorrect, corresponding wiring is adjusted, so that correct wiring; When no difference current in the differential holding circuit is passed through, show that the wiring of differential protection circuit is correct.
Further, described three-phase alternating voltage adopts pressure regulator to apply.
According to above technical scheme, can realize following beneficial effect:
Hence one can see that; the present invention is when carrying out the judgement of differential protection loop wiring polarity; can before not putting into operation, transformer carry out verification; previously used method: three-phase adds single-phase current respectively in the main transformer high-pressure side; check the correctness of differential protection loop mesohigh side current sampling data; and then add single-phase current respectively at the low-pressure side three-phase, check the correctness of differential protection loop mesolow side current sampling data.Still need check high and low pressure side current transformer polarity simultaneously.Advantage of the present invention is the method for calibration that can increase on the basis of original method of calibration among the present invention; real operation conditions after like this can analogue transformer putting into operation; whether to the differential protection secondary circuit connection correctly is the most direct method of calibration; transformer differential protection is done load test after avoiding transformer to put into operation; during verification differential circuit correctness; the differential protection loop wiring is incorrect, may need stop transformer again and change wiring.
Description of drawings
The structural representation that Fig. 1 35kV/10kV two circles of the present invention become;
Wherein, the differential winding L H2 of the differential winding L H1 low-pressure side in disconnector G1 high-pressure side isolating switch DL1 low-pressure side isolating switch DL2 high-pressure side;
Fig. 2 is the wiring schematic diagram in main transformer differential protection loop;
Wherein, main transformer high-pressure side 1 main transformer low-pressure side 2 main transformer differentials protection loop 3.
Embodiment
Accompanying drawing discloses a preferred embodiment of the present invention without limitation, explains technical scheme of the present invention below with reference to accompanying drawing.
Transformer differential protection wiring method for verifying correctness of the present invention, may further comprise the steps: after main transformer differential protection loop secondary connection connects, earlier the main transformer low-pressure side is carried out three-phase shortcircuit, (the three-phase alternating voltage value that is applied is according to the difference of main transformer capacity and the high and low side current transformer ratio of main transformer to follow the three-phase alternating voltage that applies 100～500V in the main transformer high-pressure side, determine by the scene, as long as can judge differential protection whether difference stream is arranged, generally between 100～500V), simultaneously described three-phase alternating voltage adopts pressure regulator to apply; According in the main transformer differential protection loop whether the difference current generation being arranged (Microcomputer Protection all has display then, can demonstrate the difference current value in the differential protection), whether correct with the wiring of judging the differential protection circuit, when having difference current to pass through in the differential holding circuit, (show that the difference flow valuve is non-vanishing, or much larger than the out-of-balance current value, it is following that the out-of-balance current value is generally 0.03A), show that the wiring of differential protection circuit is incorrect; When no difference current in the differential holding circuit by the time (show that the difference flow valuve is zero, or minimum out-of-balance current value, be generally 0.03A following), show that the wiring of differential protection circuit is correct.
Below will become example with 35kV/10kV two circle, and in conjunction with the accompanying drawings 1 and Fig. 2, explain technical scheme of the present invention.
Behind the secondary connection of main transformer differential protection loop; earlier main transformer 10kV side B point is carried out three-phase shortcircuit (simulation external area error); (the A point in the main transformer high-pressure side; the main transformer side of isolating switch) applies three-phase alternating voltage 100～500V voltage (according to the difference of the no-load voltage ratio of main transformer capacity and current transformer with pressure regulator; determine by the scene; as long as can judge differential protection whether difference stream is arranged, voltage is generally about 100～500V).As long as the secondary circuit wiring is correct, this moment, 35kV side current transformer was thought troubles inside the sample space, and 10kV side current transformer inflow main transformer differential protection current in loop is opposite with 35kV side current transformer inflow main transformer differential protection current in loop polarity, through overprotection sampling, calculating, difference current in the main transformer differential protection loop is zero (or less out-of-balance current value, it is following to be generally 0.03A), differential protection does not start; Incorrect as wiring, then the high and low pressure side current phase is identical, and difference current (generally greater than 1A) will be arranged in the differential protection.Just need check adjustment, up to correctly to the protection loop.
Claims (2)
1. method for verifying correctness of transformer differential protection secondary connection loop, it is characterized in that, may further comprise the steps: after protecting the loop secondary connection to connect main transformer differential, earlier the main transformer low-pressure side is carried out three-phase shortcircuit, then apply the three-phase alternating voltage of 100～500V in the main transformer high-pressure side, then according to whether having difference current to pass through in the main transformer differential protection loop, whether correct with the wiring of judging the differential protection circuit, when having difference current to pass through in the differential holding circuit, the wiring that shows the differential protection circuit is incorrect, corresponding wiring is adjusted, so that correct wiring; When no difference current in the differential holding circuit is passed through, show that the wiring of differential protection circuit is correct.
2. according to the described method for verifying correctness of transformer differential protection secondary connection loop of claim 1, it is characterized in that described three-phase alternating voltage adopts pressure regulator to apply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010211397 CN101907670A (en) | 2010-06-25 | 2010-06-25 | Method for verifying correctness of transformer differential protection secondary connection loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010211397 CN101907670A (en) | 2010-06-25 | 2010-06-25 | Method for verifying correctness of transformer differential protection secondary connection loop |
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| CN101907670A true CN101907670A (en) | 2010-12-08 |
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| CN 201010211397 Pending CN101907670A (en) | 2010-06-25 | 2010-06-25 | Method for verifying correctness of transformer differential protection secondary connection loop |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735986A (en) * | 2012-07-02 | 2012-10-17 | 安徽中兴继远信息技术股份有限公司 | Method for rapidly judging wiring error of power distribution transformer monitoring terminal |
| CN103245842A (en) * | 2013-04-18 | 2013-08-14 | 国家电网公司 | Detection method for full-system simulation running of 10-35 kV newly-mounted electrical device |
| CN104062543A (en) * | 2014-06-27 | 2014-09-24 | 中广核工程有限公司 | Zero sequence differential protection polarity verification method and zero sequence differential protection calibration method |
| CN104198875A (en) * | 2014-08-20 | 2014-12-10 | 天津二十冶建设有限公司 | Inspection method for transformer differential protection wiring |
| CN104730408A (en) * | 2015-03-03 | 2015-06-24 | 国家电网公司 | Method for verifying correctness of differential circuit of transformer with large capacity |
| CN104950203A (en) * | 2015-06-17 | 2015-09-30 | 国网山东潍坊市寒亭区供电公司 | Checking method for current protection circuit of transformer |
| CN106569075A (en) * | 2015-10-10 | 2017-04-19 | 宝山钢铁股份有限公司 | Main transformer and high voltage side cable zero-sequence differential protection polarity test circuit and method |
| CN107300684A (en) * | 2017-08-17 | 2017-10-27 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of check method in transformer differential protection secondary loop |
| CN110082614A (en) * | 2019-04-19 | 2019-08-02 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of abnormal intelligent monitoring method of relay protection secondary circuit |
| CN111624523A (en) * | 2020-06-02 | 2020-09-04 | 西安热工研究院有限公司 | System and method for verifying differential protection polarity of line of generator-transformer unit wiring mode system |
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| JP2006020452A (en) * | 2004-07-02 | 2006-01-19 | Hitachi Ltd | Protection relay system for generator main circuit |
| CN101614778A (en) * | 2009-07-23 | 2009-12-30 | 西安爱邦电气有限公司 | The connection analysis method of electric relay protection circuit |
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2010
- 2010-06-25 CN CN 201010211397 patent/CN101907670A/en active Pending
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| JP2006020452A (en) * | 2004-07-02 | 2006-01-19 | Hitachi Ltd | Protection relay system for generator main circuit |
| CN101614778A (en) * | 2009-07-23 | 2009-12-30 | 西安爱邦电气有限公司 | The connection analysis method of electric relay protection circuit |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735986B (en) * | 2012-07-02 | 2014-06-25 | 安徽中兴继远信息技术股份有限公司 | Method for rapidly judging wiring error of power distribution transformer monitoring terminal |
| CN102735986A (en) * | 2012-07-02 | 2012-10-17 | 安徽中兴继远信息技术股份有限公司 | Method for rapidly judging wiring error of power distribution transformer monitoring terminal |
| CN103245842B (en) * | 2013-04-18 | 2015-10-07 | 国家电网公司 | 10 ~ 35kV new clothes electric device total system dry run detection method |
| CN103245842A (en) * | 2013-04-18 | 2013-08-14 | 国家电网公司 | Detection method for full-system simulation running of 10-35 kV newly-mounted electrical device |
| CN104062543A (en) * | 2014-06-27 | 2014-09-24 | 中广核工程有限公司 | Zero sequence differential protection polarity verification method and zero sequence differential protection calibration method |
| CN104062543B (en) * | 2014-06-27 | 2018-10-16 | 中广核工程有限公司 | High-power transformer homodyne protects polarity verification method and homodyne protective calibration method |
| CN104198875A (en) * | 2014-08-20 | 2014-12-10 | 天津二十冶建设有限公司 | Inspection method for transformer differential protection wiring |
| CN104730408B (en) * | 2015-03-03 | 2017-11-14 | 国家电网公司 | A kind of method for verifying high-power transformer differential circuit correctness |
| CN104730408A (en) * | 2015-03-03 | 2015-06-24 | 国家电网公司 | Method for verifying correctness of differential circuit of transformer with large capacity |
| CN104950203A (en) * | 2015-06-17 | 2015-09-30 | 国网山东潍坊市寒亭区供电公司 | Checking method for current protection circuit of transformer |
| CN104950203B (en) * | 2015-06-17 | 2017-08-29 | 国网山东潍坊市寒亭区供电公司 | Transformer current protective loop method of calibration |
| CN106569075A (en) * | 2015-10-10 | 2017-04-19 | 宝山钢铁股份有限公司 | Main transformer and high voltage side cable zero-sequence differential protection polarity test circuit and method |
| CN106569075B (en) * | 2015-10-10 | 2019-02-05 | 宝山钢铁股份有限公司 | Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method |
| CN107300684A (en) * | 2017-08-17 | 2017-10-27 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of check method in transformer differential protection secondary loop |
| CN110082614A (en) * | 2019-04-19 | 2019-08-02 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of abnormal intelligent monitoring method of relay protection secondary circuit |
| CN111624523A (en) * | 2020-06-02 | 2020-09-04 | 西安热工研究院有限公司 | System and method for verifying differential protection polarity of line of generator-transformer unit wiring mode system |
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| ASS | Succession or assignment of patent right |
Owner name: XIUQIAN POWER SUPPLY COMPANY, JIANGSU ELECTRIC POW Effective date: 20130121 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130121 Address after: 223900 Sihong county power supply company, No. 1 Changjiang Road, Sihong County, Jiangsu, Suqian Applicant after: Sihong Power Supply Company, Jiangsu Electric Power Co. Applicant after: Jiangsu Suqian Power Supply Company Applicant after: Jiangsu Electric Power Company Applicant after: State Grid Corporation of China Address before: 223900 Sihong county power supply company, No. 1 Changjiang Road, Sihong County, Jiangsu, Suqian Applicant before: Sihong Power Supply Company, Jiangsu Electric Power Co. |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20101208 |