CN101349724B - Large-scale transformer differential protective system test method - Google Patents
Large-scale transformer differential protective system test method Download PDFInfo
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- CN101349724B CN101349724B CN2007100439199A CN200710043919A CN101349724B CN 101349724 B CN101349724 B CN 101349724B CN 2007100439199 A CN2007100439199 A CN 2007100439199A CN 200710043919 A CN200710043919 A CN 200710043919A CN 101349724 B CN101349724 B CN 101349724B
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Abstract
The invention relates to a large transformer, in particular to a test method for large transformers. A large transformer differential protection system test method comprises a different protection relay of a transformer, a phase meter and an ammeter and comprises the steps of: 1, selecting the ranges of the phase meter according to the test current for the check of a phase angle; switching the display picture of the differential synthetic protection relay to a differential current display unit; 2, connecting a power supply, utilizing the ammeter and the differential synthetic protection relay to check the current passing the transformer; 3, utilizing the phase meter at the current input of the differential protection relay to check and record the phase difference of the cophase currents at two sides; 4, simulating the fault state of the transformer, measuring the phase angle and the detection differential current on the relay, confirming the reliable operation of the differential protection relay under the default state; 4, ending the test, turning off the power supply and recovering former wires.
Description
Technical field
The present invention relates to high-power transformer, relate in particular to a kind of method of testing of high-power transformer.
Background technology
The differential protection of high-power transformer is under the situation about breaking down in the protected location, in time reports to the police higher level's circuit breaker trip is cut off the electricity supply with the protection transformer.
Differential protection mainly is made of two groups of (3 every group) current transformers of differential protection relay and transformer high and low pressure side; can action message during test for the checking protective relay; except that the monomer test of carrying out differential protection relay, also need the system that is made of relay and mutual inductor is carried out the system synthesis test.
Under the situation that in the past adopts electromechanical or electromagnetic type differential protection relay; because test and detection means restriction; the required test current of differential protective system compbined test is very big; adopt dedicated transformer that experiment power supply (needed power supply capacity is big) is provided; power supply is added in transformer one side; in the short circuit of transformer opposite side; operating mode during the big current analog transformer actual motion that utilizes that short circuit produces detects the correctness of wiring, detecting element polarity and the differential relay setting valve of differential protection loop.The testing equipment volume is big, weight big, power consumption is big, and the test occupied ground is big.Rig-site utilization is very inconvenient, and the working-yard condition is not easy to satisfy testing requirements.
Summary of the invention
The present invention is intended to solve the defective of existing detection means, and a kind of large-scale transformer differential protective system test method is provided.The present invention can not only solve in the test of large-scale transformer differential protective system synthesis because the restriction of test detection means needs big test current to finish test; careless slightly may be to being caused damage by things; the problem that risk is bigger, and solved that large-scale transformer differential protective system synthesis experimentation cost height, energy consumption are big, problem such as test setup time is long.
The present invention is achieved in that a kind of large-scale transformer differential protective system test method, and differential protective system comprises the differential protection relay of transformer, it is characterized in that, also adopts phase meter and reometer, and this method of testing comprises the steps:
Step 1 is selected the different range of phase meter according to the size of test current, so that the detected phase angle; And before test, the display frame of differential integrated protection relay is switched to the difference current display unit;
Step 2, energized is utilized the test current of described reometer detection by transformer, should be consistent with the electric current that the display unit of described differential integrated protection relay shows;
Step 3 is utilized the phase differential of phase meter at the both sides electric current of differential protection relay current input terminal detection homophase, and record;
Step 4, the malfunction of analogue transformer, measured phase angle and on relay monitoring difference stream, guarantee the differential protection relay action message down of nonserviceabling;
Step 5 finishes test, and powered-down recovers former wiring.
The method of testing of described large-scale transformer differential protective system, described phase meter is pincerlike phase meter, and its minimum range can be 200mA, and phasing degree resolution is 0.1 degree.
The method of testing of described large-scale transformer differential protective system, described reometer is a pincers type reometer, its precision and the identical or high one-level of described differential protection relay degree of accuracy.
The method of testing of described large-scale transformer differential protective system; in step 2 and step 4; the difference current display frame of differential protection relay generally comprises on display unit: the transformer primary side current; the Circuit Fault on Secondary Transformer electric current reaches once and flows with the poor of secondary; if CT polarity and distribution are accurate in the differential protective system, the displayed value of difference stream should be far smaller than the setting current value.
The method of testing of described large-scale transformer differential protective system; in step 4, if the phasing degree of being detected and difference stream and different design then should have a power failure and check each equipment in the differential protective system; find out reason and the continuation test of change back, it is correct that differential protective system is measured.
The present invention utilizes phase meter to detect the phase differential of differential protection relay both sides input current, and the method for observation difference between current directly perceived is carried out the compbined test of differential protective system on differential protection relay.Experiment power supply adopts on-the-spot 380V supply voltage commonly used, need not to be equipped with the test dedicated transformer.The three-phase shortcircuit electric current of this test method is less, and test method is reliable, and execute-in-place is convenient.Utilize large-scale transformer differential protective System Test Technic of the present invention, required test current is little during test, has reduced energy resource consumption, experimental safe, reliable; Reduce empirical risk, avoid because of the excessive damage equipment of test current.And required testing equipment is few, and patch reduces and do not need the heavy in section test cable, can reduce construction cost effectively.
Embodiment
Below, in conjunction with embodiment, further specify the present invention:
At present, high-power transformer all has intelligent differential integrated protection relay, the service data that on the display screen of this protective relay, can intuitively show transformer as: voltage, electric current and transformer once, difference between current etc. between the secondary.The test current that passes through transformer when carrying out the differential protective system compbined test can show on display screen; and the sensitivity of differential relay is very high; to test current require lowly, relay input end electric current only needs to reach that 0.01A is above just can accurately detect.
During test, select the different range of phase meter according to the size of test current, so that the detected phase angle, the phase meter minimum range can reach 200mA, and phasing degree resolution can reach 0.1 degree.
Display frame with differential integrated protection relay before the test switches to the difference current display unit, and is ready to pincers type phase meter and identical with the differential protection relay degree of accuracy or higher leveled pincers type reometer.
The call through test power supply utilizes the test current of pincers type reometer detection by transformer, should show that electric current is consistent with relay.
Utilize the phase differential of pincers type phase meter at the both sides electric current of differential protection relay current input terminal detection homophase, and record.
The difference current display frame of differential protection relay generally comprises: the transformer primary side current; the Circuit Fault on Secondary Transformer electric current reaches once and flows with the poor of secondary; if CT polarity and distribution are accurate in the differential protective system, the displayed value of difference stream should be far smaller than the setting current value.
If phasing degree and difference stream and different design, each equipment in the inspection differential protective system that then should have a power failure is found out reason and the change back continues to test, and makes differential protective system correct, reliable.
The malfunction of analogue transformer, measured phase angle and on relay monitoring difference stream, guarantee the differential protection relay action message down of nonserviceabling.
Off-test, powered-down is also removed patch, recovers original wiring.
Claims (4)
1. large-scale transformer differential protective system test method, differential protective system comprises the differential protection relay of transformer, it is characterized in that, also adopts phase meter and reometer, this method of testing comprises the steps:
Step 1 is selected the different range of phase meter according to the size of test current, so that the detected phase angle; And before test, the display frame of differential protection relay is switched to the difference current display unit;
Step 2, energized is utilized the test current of described reometer detection by transformer, should show consistent with the difference current display unit of described differential protection relay;
Step 3 is utilized the phase differential of phase meter at the both sides electric current of differential protection relay current input terminal detection homophase, and record;
Step 4, the malfunction of analogue transformer, measured phase angle and on relay monitoring difference stream, guarantee the differential protection relay action message down of nonserviceabling;
Step 5 finishes test, and powered-down recovers former wiring;
In step 2 and step 4; the difference current display frame of differential protection relay comprises on the difference current display unit: the transformer primary side current; the Circuit Fault on Secondary Transformer electric current reaches once and flows with the poor of secondary; if CT polarity and distribution are accurate in the differential protective system, the displayed value of difference stream should be far smaller than the setting current value.
2. the method for testing of large-scale transformer differential protective according to claim 1 system is characterized in that described phase meter is pincerlike phase meter, and its minimum range is 200mA, and phasing degree resolution is 0.1 degree.
3. the method for testing of large-scale transformer differential protective according to claim 1 system is characterized in that described reometer is a pincers type reometer, its precision and the identical or high one-level of described differential protection relay degree of accuracy.
4. the method for testing of large-scale transformer differential protective according to claim 1 system; it is characterized in that; in step 4; if the phasing degree of being detected and difference stream and different design; then should have a power failure and check each equipment in the differential protective system; find out reason and the continuation test of change back, it is correct that differential protective system is measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100439199A CN101349724B (en) | 2007-07-17 | 2007-07-17 | Large-scale transformer differential protective system test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100439199A CN101349724B (en) | 2007-07-17 | 2007-07-17 | Large-scale transformer differential protective system test method |
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| CN101349724A CN101349724A (en) | 2009-01-21 |
| CN101349724B true CN101349724B (en) | 2010-10-13 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101788625B (en) * | 2009-07-23 | 2012-07-04 | 西安爱邦电气有限公司 | Method for analyzing connection of power relay protection circuit |
| CN101788630B (en) * | 2009-07-23 | 2012-06-13 | 西安爱邦电气有限公司 | Connection analysis method for conventional transformer relaying circuit in electric system |
| CN102095950B (en) * | 2010-11-10 | 2012-12-26 | 中冶建工有限公司 | Overall test and construction method of differential protection system of large-scale transformer |
| CN103675386B (en) * | 2013-11-12 | 2016-04-13 | 中铁二十一局集团电务电化工程有限公司 | Upflow transformer for low-voltage energization |
| 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 |
| CN104142448B (en) * | 2014-07-31 | 2016-09-14 | 国家电网公司 | A kind of defencive function automatic Verification method of microcomputer type transform er differential protection device |
| 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 |
| CN106772018B (en) * | 2017-01-17 | 2019-08-27 | 北京四方继保自动化股份有限公司 | The method of discrimination of one Ge Ban main electrical scheme substation's dead-zone fault choosing string |
| 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 |
| CN107300684B (en) * | 2017-08-17 | 2019-08-23 | 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 circuit |
| CN110646692B (en) * | 2019-09-16 | 2021-10-01 | 积成电子股份有限公司 | On-site bus protection automatic on-load test method and test module |
| CN111103487A (en) * | 2019-12-24 | 2020-05-05 | 国网浙江省电力有限公司电力科学研究院 | Non-invasive PST anomaly monitoring method based on power consumption analysis |
| CN111693797A (en) * | 2020-04-30 | 2020-09-22 | 中国电力科学研究院有限公司 | Test method and device for transformer protection equipment |
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| CN101349724A (en) | 2009-01-21 |
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