CN104330763A - Test method for bushing current transformer of main transformer - Google Patents
Test method for bushing current transformer of main transformer Download PDFInfo
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- CN104330763A CN104330763A CN201410681795.7A CN201410681795A CN104330763A CN 104330763 A CN104330763 A CN 104330763A CN 201410681795 A CN201410681795 A CN 201410681795A CN 104330763 A CN104330763 A CN 104330763A
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Abstract
The invention discloses a test method for a bushing current transformer of a main transformer. The test method for the bushing current transformer of the main transformer includes that when testing the transformation ratio, polarity, voltage-ampere characteristics and the like of the bushing current transformer of one side of the main transformer, using a testing device to exert alternating current voltage from a secondary side terminal of the bushing current transformer, generating alternating electrical quantity at the primary side of the bushing current transformer of the main transformer through electromagnetic coupling, and leading the electrical quantity to the testing device through a test wire to analyze and judge; using a lead to carry out pop joint on the head and end of the primary main transformer winding of the non-test side of the main transformer to form a current loop to generate magnetic flux so as to inhibit the induced electromotive force generated in the primary main transformer winding of the test side of the main transformer to counteract the influence of the induced electromotive force on the bushing current transformer to perform the test successfully. The test method for the bushing current transformer of the main transformer is capable of counteracting the influence of the primary winding of the main transformer on the test when testing the transformation ratio, polarity and voltage-ampere characteristics of the bushing current transformer of the main transformer, improving the working efficiency and inspection quality and guaranteeing the reliable running of electrical equipment.
Description
Technical field
The present invention relates to the test method technical field of a kind of sleeve of main transformer current transformer in transforming plant primary equipment.
Background technology
Main transformer is the heart of transforming plant primary equipment, and its performance determines the stabilization of power grids, safety, reliability service.Relay protection is the important means ensureing that power system safety and stability runs.Sleeve of main transformer current transformer is the sensor that the secondary devices such as relay protection obtain main transformer current information, and it is converted into by the primary current of transformer the operation conditions that secondary current reacts transformer.To the test of sleeve of main transformer current transformer, it is an important electrical installation.Therefore, the test of sleeve of main transformer current transformer is transformer requisite pilot project after handing-over, overhaul and secondary circuit variation.Current transformer test comprises no-load voltage ratio, polarity test, volt-ampere characteristic test etc., present stage, these pilot projects all adopt " voltage method " namely apply from sleeve of main transformer Current Transformer Secondary side alternating voltage disposable wiring, disposablely to complete.But the primary side of sleeve of main transformer current transformer comprises main transformer winding on the one hand, there is very large induction reactance and capacitive reactance in main transformer winding, and impedance is comparatively large, respectively there is electromagnetic coupled mutually, has very large interference each other; On the other hand, due to main transformer high-potting, remanent magnetism can be produced in master iron core.The impact of these two aspects, can cause that sleeve of main transformer current transformer " voltage method " experimental test data are inaccurate, efficiency is not high, even cannot test.
Summary of the invention
The present invention is intended to solve above-mentioned sleeve of main transformer current transformer ratio, polarity and volt-ampere characteristic test Problems existing, and provide a kind of Elimination test to disturb, improve test figure accuracy, in very short time, the test method of sleeve of main transformer current transformer test mission can be completed simultaneously smoothly.
The technical scheme that the present invention solves the employing of described problem is:
A kind of sleeve of main transformer current transformer test method, comprising: no-load voltage ratio test, polarity test and volt-ampere characteristic test etc.Wherein:
(1) tested sleeve of main transformer current transformer primary side two ends (L, X) cause milivoltmeter connection terminal in proving installation with p-wire;
(2) two ends, tested sleeve of main transformer Current Transformer Secondary side (K1, K2) p-wire causes alternating-voltage generator connection terminal in proving installation;
(3) with going between the main transformer winding in non-test for main transformer side short circuit end to end, form current return, this electric current produces and is tested side magnetic flux in master iron core
the magnetic flux that direction is contrary
produce again the induction electromotive force that equal and opposite in direction, direction are contrary in by test side main transformer winding, thus suppress the induction electromotive force that produces in the main transformer winding of main transformer test one time, side, to offset its impact on casing current transformer test;
(4) no-load voltage ratio test: proving installation is applied to voltage on tested sleeve of main transformer Current Transformer Secondary side and by the ratio of electromagnetic induction to the alternating voltage on tested sleeve of main transformer current transformer primary side, is namely the no-load voltage ratio of tested sleeve of main transformer current transformer;
(5) polarity test: proving installation applies alternating current I2 from tested sleeve of main transformer Current Transformer Secondary side, pass through electromagnetic induction, tested sleeve of main transformer current transformer primary side induces electric current I 1, compares the direction of I2 and I 1, just can do polarity judgement;
(6) volt-ampere characteristic test: tested sleeve of main transformer current transformer primary side open circuit, proving installation applies alternating current I from tested sleeve of main transformer Current Transformer Secondary side, alternating voltage U is recorded in tested sleeve of main transformer Current Transformer Secondary side, form one group of U-I data, this is volt-ampere characteristic test.
The invention has the beneficial effects as follows: the disturbing factor had a strong impact on can be had to compensate and offset to test findings and process to what occur in test, guarantee the disposable wiring of the test such as sleeve of main transformer current transformer ratio, polarity and volt-ampere characteristic, disposablely to complete smoothly, ensure that the accurate, reliable of test findings, improve work efficiency and quality inspection.And find the problem that sleeve of main transformer current transformer is potential early, ensure that electrical equipment is healthy, stable, reliably put into operation.
Accompanying drawing explanation
Fig. 1 is test connection schematic diagram of the present invention.
Embodiment
As shown in Figure 1, test method step of the present invention is as follows:
(1) casing current transformer primary side two ends, main transformer high-pressure side (L, X) causes milivoltmeter connection terminal in proving installation with p-wire;
(2) casing current transformer secondary side two ends, main transformer high-pressure side (K1, K2) causes alternating-voltage generator connection terminal in proving installation with p-wire;
(3) with lead-in wire by main transformer, low-pressure side main transformer winding short circuit end to end, form current return, this electric current produces and is tested side magnetic flux in master iron core
the magnetic flux that direction is contrary
in the winding of main transformer high-pressure side, produce again the induction electromotive force that equal and opposite in direction, direction are contrary, thus suppress the induction electromotive force that produces in the main transformer winding of one time, main transformer high-pressure side, to offset its impact on casing current transformer test;
(4) no-load voltage ratio test: proving installation is applied to voltage on the casing current transformer secondary side of main transformer high-pressure side and by the ratio of electromagnetic induction to the alternating voltage on the casing current transformer primary side of main transformer high-pressure side, is namely the no-load voltage ratio of main transformer high-pressure side casing current transformer;
(5) polarity test: proving installation applies alternating current I2 from main transformer high-pressure side casing current transformer secondary side, pass through electromagnetic induction, main transformer high-pressure side casing current transformer primary side induces electric current I 1, compares the direction of I2 and I 1, just can do polarity judgement;
(6) volt-ampere characteristic test: main transformer high-pressure side casing current transformer primary side is opened a way, proving installation applies alternating current I from main transformer high-pressure side casing current transformer secondary side, in main transformer high-pressure side, casing current transformer secondary side records alternating voltage U, form one group of U-I data, this is volt-ampere characteristic test.
The present invention tests main transformer medium voltage side casing current transformer, with lead-in wire by the main transformer winding in main transformer high and low pressure side short circuit end to end, need form current return.
The present invention tests main transformer low-pressure side casing current transformer, with lead-in wire main transformer is high, medium voltage side main transformer winding short circuit end to end, need form current return.
Claims (1)
1. a test method for sleeve of main transformer current transformer, is characterized in that, step is as follows:
(1) tested sleeve of main transformer current transformer primary side two ends (L, X) cause milivoltmeter connection terminal in proving installation with p-wire;
(2) two ends, tested sleeve of main transformer Current Transformer Secondary side (K1, K2) p-wire causes alternating-voltage generator connection terminal in proving installation;
(3) with going between the main transformer winding in non-test for main transformer side short circuit end to end, form current return, this electric current produces and is tested side magnetic flux in master iron core
the magnetic flux that direction is contrary
produce again the induction electromotive force that equal and opposite in direction, direction are contrary in by test side main transformer winding, thus suppress the induction electromotive force that produces in the main transformer winding of main transformer test one time, side, to offset its impact on casing current transformer test;
(4) no-load voltage ratio test: proving installation is applied to voltage on tested sleeve of main transformer Current Transformer Secondary side and by the ratio of electromagnetic induction to the alternating voltage on tested sleeve of main transformer current transformer primary side, is namely the no-load voltage ratio of tested sleeve of main transformer current transformer;
(5) polarity polarity: proving installation applies alternating current I2 from tested sleeve of main transformer Current Transformer Secondary side, pass through electromagnetic induction, tested sleeve of main transformer current transformer primary side induces electric current I 1, compares the direction of I2 and I 1, just can do polarity judgement;
(6) volt-ampere characteristic test: tested sleeve of main transformer current transformer primary side open circuit, proving installation applies alternating current I from tested sleeve of main transformer Current Transformer Secondary side, alternating voltage U is recorded in tested sleeve of main transformer Current Transformer Secondary side, form one group of U-I data, this is volt-ampere characteristic test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410681795.7A CN104330763A (en) | 2014-11-24 | 2014-11-24 | Test method for bushing current transformer of main transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410681795.7A CN104330763A (en) | 2014-11-24 | 2014-11-24 | Test method for bushing current transformer of main transformer |
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| CN104330763A true CN104330763A (en) | 2015-02-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106291228A (en) * | 2016-08-10 | 2017-01-04 | 国网浙江省电力公司金华供电公司 | Power transformer enclosure CT no-load voltage ratio polarity test platform |
| CN108051662A (en) * | 2017-11-08 | 2018-05-18 | 保定天威集团特变电气有限公司 | More device body series transformer test methods, assembly and test system |
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| CN202854318U (en) * | 2012-11-02 | 2013-04-03 | 天津市电力公司 | Current transformer 10% error checking system |
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| CN201035088Y (en) * | 2007-04-09 | 2008-03-12 | 王世祥 | Device for testing main changing casing tube CT polar |
| CN101162256A (en) * | 2007-11-22 | 2008-04-16 | 湖北省电力公司咸宁供电公司 | Method to determine the polarity of bushing TA without disintegration for main transformer |
| CN101661090A (en) * | 2009-09-23 | 2010-03-03 | 河南省电力公司商丘供电公司 | Through-flow tester of neutral point current transformer of transformer |
| CN202854318U (en) * | 2012-11-02 | 2013-04-03 | 天津市电力公司 | Current transformer 10% error checking system |
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| CN106291228A (en) * | 2016-08-10 | 2017-01-04 | 国网浙江省电力公司金华供电公司 | Power transformer enclosure CT no-load voltage ratio polarity test platform |
| CN108051662A (en) * | 2017-11-08 | 2018-05-18 | 保定天威集团特变电气有限公司 | More device body series transformer test methods, assembly and test system |
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