CN105319478A - Un-disassembly polarity and transformation ratio testing method for transformer bushing - Google Patents
Un-disassembly polarity and transformation ratio testing method for transformer bushing Download PDFInfo
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- CN105319478A CN105319478A CN201410300726.7A CN201410300726A CN105319478A CN 105319478 A CN105319478 A CN 105319478A CN 201410300726 A CN201410300726 A CN 201410300726A CN 105319478 A CN105319478 A CN 105319478A
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Abstract
The invention discloses an un-disassembly polarity and transformation ratio testing method for a transformer bushing, and the method comprises the specific steps: 1, checking the integrity of a current loop; 2, enabling a transformer non-testing side winding to be in a short-circuit state, and eliminating the leakage reactance of a transformer; 3, directly adding an output end of a high-power self-coupling voltage regulator to a to-be-tested phase and an N-phase leading-out wire; 4, adjusting the output voltage of the high-power self-coupling voltage regulator, changing the current flowing through a transformer winding, i.e., a primary current of a bushing current transformer, and testing the polarity and transformation ratio of the bushing current transformer through a clamp-shaped phase meter. The method is advantageous in that the method does not need disassembly testing, can achieve the complete check of the whole current loop of the transformer bushing current transformer, eliminates the hidden dangers of disassembly testing and a theoretical analysis method, eliminates the wrong testing and testing leakage caused by a testing method, and guarantees the normal operation of a protection device.
Description
Technical field
The present invention relates to the technical field of transformer, more particularly relate to the technical field of bushing shell for transformer method of testing.
Background technology
At present, the method for testing of bushing shell for transformer current transformer polarity and no-load voltage ratio mainly contains two kinds, and one is before casing current transformer is installed or tests on ground after laying down, and namely carries out disintegration test, before this method is used for transformer new clothes; Two kinds is do not disintegrate to carry out theoretical analysis by direct current magnetic potential equilibrium principle after bushing shell for transformer current transformer is installed.Above-mentioned two kinds of methods all can not be done the whole current return of bushing shell for transformer current transformer and check to there is certain hidden danger thoroughly.Especially the casing current transformer of transformer neutral point, after main transformer puts into operation, its secondary circuit does not have electric current yet under normal circumstances, bringing onto load inspection can not be carried out, there is great hidden danger, once there is a lot of serious accident causing grid power blackout because of bushing shell for transformer secondary loop of mutual inductor existing problems in electric system.
Summary of the invention
Object of the present invention is exactly provide a kind of after main transformer puts into operation to solve above-mentioned deficiency, and the bushing shell for transformer that can give a thorough inspection bushing shell for transformer secondary loop of mutual inductor online does not disintegrate the method that polarity and no-load voltage ratio are tested.
The technical solution that the present invention adopts to solve the problems of the technologies described above is as follows:
Bushing shell for transformer do not disintegrate polarity and no-load voltage ratio test method, its concrete testing procedure is as follows, the first step: inspection current return integrality; Second step: by transformer non-test side winding short circuit, eliminating transformer leakage reactance; 3rd step: directly with high-power automatic coupling voltage regulator output terminal be added in test with on N phase extension line; 4th step: the size regulating automatic coupling voltage regulator output voltage, changes and flows through the electric current of Transformer Winding and the primary current of casing current transformer, by polarity and the no-load voltage ratio of pincerlike phase meter test casing current transformer.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is: adopt this method without the need to carrying out disintegration test again; can do the whole current return of bushing shell for transformer current transformer and check thoroughly; eliminate the hidden danger that may exist with disintegration test and theoretical analysis method; stop because the flase drop that test method causes is tested to test with undetected, ensure that the normal operation of protective device.
Accompanying drawing explanation
Fig. 1 is test philosophy structural representation of the present invention.
Embodiment
As shown in Figure 1, bushing shell for transformer do not disintegrate polarity and no-load voltage ratio test method, its concrete testing procedure is as follows, the first step: inspection current return integrality; Second step: by transformer non-test side winding short circuit, eliminating transformer leakage reactance, for three-winding transformer equivalent circuit, after the winding of short circuit mesolow side, only consider the physical impedance of on high-tension side winding during test, thus reduce the equivalent impedance of the transformer in process of the test; 3rd step: directly with high-power automatic coupling voltage regulator output terminal be added in test with on N phase extension line; 4th step: the size regulating automatic coupling voltage regulator output voltage, change and flow through the electric current of Transformer Winding and the primary current of casing current transformer, by polarity and the no-load voltage ratio of pincerlike phase meter test casing current transformer, the primary current now flowing into sleeve pipe TA can obtain with following formulae discovery:
in formula:
for flowing into the primary current of sleeve pipe TA;
for trial voltage;
x s for transformer impedance.
The size of primary current also should be determined according to the no-load voltage ratio of sleeve pipe TA, and general warranty sleeve pipe TA(comprises whole secondary circuit) secondary current
at 30 ~ 50mA, namely polarity and the no-load voltage ratio of sleeve pipe TA measured accurately by available pincerlike phase meter.
Application example: on October 17th, 2011, after Jingmen, Hubei 220kV Hu Ji electric substation #2 main transformer body terminal box is changed, adopt said method, carried out the test of polarity and no-load voltage ratio to the sleeve pipe TA of high pressure side, the test result of medium voltage side A phase is as shown in table 1.Test device therefor has 5kVA automatic coupling voltage regulator, ML360 phase meter, multimeter, and the model of sleeve pipe TA is LRB-110-B.
Table 1 is collection #2 main transformer medium voltage side Polarity of Bushing TA, no-load voltage ratio test recklessly
A4181 loop is A phase bushings TA, and no-load voltage ratio is after tested 600/5, and polarity is by bus bar side.Being numbered LL421, LL424 loop is neutral point zero sequence TA, and no-load voltage ratio is 600/5 after tested, and polarity is by transformer side.Main transformer protection device model is RCS-978E, defines the positive ends of transformer neutral point zero sequence TA in transformer side, and demonstrate the correctness of zero sequence Polarity of Bushing TA at shop instruction.
After #2 main transformer puts into operation, carried out the polarity verification of on-load, the test result of its medium voltage side A phase sleeve pipe TA is as shown in table 2.Test device therefor is ML360 phase meter; During test, load is active power 49.3MW, and reactive power is 0Mvar; Reference voltage takes from 220kV bus A phase secondary voltage (A630).
Table 2 is collection #2 main transformer medium voltage side sleeve pipe TA loading tests table recklessly
| Loop is numbered | Secondary current/A | Delayed reference voltage angle/° |
| A4161 | 2.103 | 187.3 |
| B4161 | 2.095 | 303.6 |
| C4161 | 2.033 | 60.4 |
| A4171 | 2.169 | 187.7 |
| B4171 | 2.145 | 302.8 |
| C4171 | 2.126 | 60.6 |
| A4181 | 2.095 | 187.6 |
| B4181 | 2.113 | 302.6 |
| C4181 | 2.162 | 60.7 |
As shown in Table 2, the electric current of medium voltage side sleeve pipe TA, by transformer streamline bus, demonstrates the correctness of tape loop test Polarity of Bushing TA, no-load voltage ratio method.
Claims (1)
1. bushing shell for transformer do not disintegrate polarity and no-load voltage ratio test method, it is characterized in that concrete testing procedure is as follows, the first step: inspection current return integrality; Second step: by transformer non-test side winding short circuit, eliminating transformer leakage reactance; 3rd step: directly with high-power automatic coupling voltage regulator output terminal be added in test with on N phase extension line; 4th step: the size regulating automatic coupling voltage regulator output voltage, changes and flows through the electric current of Transformer Winding and the primary current of casing current transformer, by polarity and the no-load voltage ratio of pincerlike phase meter test casing current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410300726.7A CN105319478A (en) | 2014-06-30 | 2014-06-30 | Un-disassembly polarity and transformation ratio testing method for transformer bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410300726.7A CN105319478A (en) | 2014-06-30 | 2014-06-30 | Un-disassembly polarity and transformation ratio testing method for transformer bushing |
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| CN105319478A true CN105319478A (en) | 2016-02-10 |
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| CN201410300726.7A Pending CN105319478A (en) | 2014-06-30 | 2014-06-30 | Un-disassembly polarity and transformation ratio testing method for transformer bushing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109061356A (en) * | 2018-09-26 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of detection method and device of distribution transformer operational taps |
| CN113376563A (en) * | 2021-06-08 | 2021-09-10 | 中国南方电网有限责任公司超高压输电公司 | Transformer lifting seat structure with current transformer test wire and test method |
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| JPH11304870A (en) * | 1998-04-21 | 1999-11-05 | Toshiba Eng Co Ltd | Method for confirming polarity of tertiary winding of meter current transformer, and testing method for ground protective relay using the same |
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| CN102539942A (en) * | 2011-12-12 | 2012-07-04 | 河南省电力公司洛阳供电公司 | Portable transformation ratio testing instrument of current transformer |
| CN102565557A (en) * | 2012-02-22 | 2012-07-11 | 明珠电气有限公司 | Method and device for testing transformation ratio of dry type transformer |
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2014
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| JPH11304870A (en) * | 1998-04-21 | 1999-11-05 | Toshiba Eng Co Ltd | Method for confirming polarity of tertiary winding of meter current transformer, and testing method for ground protective relay using the same |
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| CN102539942A (en) * | 2011-12-12 | 2012-07-04 | 河南省电力公司洛阳供电公司 | Portable transformation ratio testing instrument of current transformer |
| CN102565557A (en) * | 2012-02-22 | 2012-07-11 | 明珠电气有限公司 | Method and device for testing transformation ratio of dry type transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109061356A (en) * | 2018-09-26 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of detection method and device of distribution transformer operational taps |
| CN109061356B (en) * | 2018-09-26 | 2022-05-20 | 云南电网有限责任公司电力科学研究院 | Method and device for detecting running gear of distribution transformer |
| CN113376563A (en) * | 2021-06-08 | 2021-09-10 | 中国南方电网有限责任公司超高压输电公司 | Transformer lifting seat structure with current transformer test wire and test method |
| CN113376563B (en) * | 2021-06-08 | 2022-08-12 | 中国南方电网有限责任公司超高压输电公司 | Transformer lifting seat structure with current transformer test wire and test method |
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