CN110888084A - Method for measuring short-circuit point of winding coil of large transformer - Google Patents
Method for measuring short-circuit point of winding coil of large transformer Download PDFInfo
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- CN110888084A CN110888084A CN201911182154.6A CN201911182154A CN110888084A CN 110888084 A CN110888084 A CN 110888084A CN 201911182154 A CN201911182154 A CN 201911182154A CN 110888084 A CN110888084 A CN 110888084A
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Abstract
The invention relates to a method for measuring a short-circuit point of a winding coil of a large transformer, belonging to the technical field of transformer tests. The technical scheme is as follows: measuring the direct-current resistance at the end A, B of the transformer by using a direct-current resistance meter and two direct resistance wires of the direct-current resistance meter; three direct resistance wires of a direct current resistance instrument are utilized to apply current to the end of a transformer coil A, B, and voltage is measured at the end of a transformer coil A, D, so that the A, O resistance, namely the resistance from a wire end to a short-circuit point, can be accurately measured; by comparing the measured contact resistance without a short-circuit point with the contact resistance with a short-circuit point, the short-circuit position can be determined more accurately. The method can accurately find the position of the coil short-circuit point, is suitable for accurate positioning when the large transformer winding coil is short-circuited, and is convenient for the development of the next repair work.
Description
Technical Field
The invention relates to a method for measuring a short-circuit point of a winding coil of a large transformer, belonging to the technical field of transformer tests.
Background
When a short circuit occurs in a winding coil of a transformer manufactured by a large transformer manufacturing enterprise, the short circuit position needs to be found out. The prior art method can only find out the approximate position of the coil short-circuit point, and can not accurately find out the specific position of the coil short-circuit point, thereby bringing difficulty and inconvenience to the next repair work.
Disclosure of Invention
The invention aims to provide a method for measuring a short-circuit point of a winding coil of a large-scale transformer, which is used for accurately searching the position of the short-circuit point of the coil, is suitable for accurately positioning when the winding coil of the large-scale transformer is short-circuited, is convenient for the development of the next repair work and solves the problems in the background technology.
The technical scheme of the invention is as follows:
a method for measuring the short-circuit point of winding coil of large-scale transformer, use the direct-flow resistance meter, measure the direct-flow resistance of the end A, B end of the transformer with two straight resistance lines of the direct-flow resistance meter; three direct resistance wires of a direct current resistance instrument are utilized to apply current to the end of the transformer coil A, B, and voltage is measured at the end of the transformer coil A, D, so that the resistance of A, O (from a wire end to a short-circuit point) can be accurately measured; similarly, current is applied to the end of the transformer coil A, B, and voltage is measured at the end of the transformer coil B, D, so that the resistance of B, O (from the end of the wire to the short-circuit point) can be accurately measured; by comparing the measured contact resistance without a short-circuit point with the contact resistance with a short-circuit point, the short-circuit position can be determined more accurately.
Determining the position of the short circuit: the ratio of the short circuit point to the whole coil is RAO/RABOr RBO/RAB。
The invention has the beneficial effects that: the three direct resistance wires can be used for measuring the direct resistance of the short circuit point of the winding coil of the large-scale transformer, the position of the short circuit point of the coil can be accurately searched, the method is suitable for accurate positioning when the winding coil of the large-scale transformer is short-circuited, and the next repair work is conveniently carried out.
Drawings
FIG. 1 is a schematic diagram of the three-wire method of the present invention for measuring the AO (wire end to short circuit point) resistance (contact resistance without short circuit point);
FIG. 2 is a schematic diagram of the resistance of BO (line end to short circuit point) measured by the three-wire method of the present invention (contact resistance without short circuit point).
Detailed Description
The invention is further illustrated by way of example in the following with reference to the accompanying drawings.
A method for measuring the short-circuit point of winding coil of large-scale transformer, use the direct-flow resistance meter, measure the direct-flow resistance of the end A, B end of the transformer with two straight resistance lines of the direct-flow resistance meter; three direct resistance wires of a direct current resistance instrument are utilized to apply current to the end of the transformer coil A, B, and voltage is measured at the end of the transformer coil A, D, so that the resistance of A, O (from a wire end to a short-circuit point) can be accurately measured; similarly, current is applied to the end of the transformer coil A, B, and voltage is measured at the end of the transformer coil B, D, so that the resistance of B, O (from the end of the wire to the short-circuit point) can be accurately measured; by comparing the measured contact resistance without a short-circuit point with the contact resistance with a short-circuit point, the short-circuit position can be determined more accurately.
Determining the position of the short circuit: the ratio of the short circuit point to the whole coil is RAO/RABOr RBO/RAB。
Example 1: the national grid ancient spring converter transformer +/-500 kV grid side coil single resistance is about 7.340 omega, the total single resistance of 16 and 14 coils is in a normal range, the two resistances are smaller and are 5.721 omega and 5.725 omega respectively, and the existence of a short circuit point in the coil can be determined. R can be measured by the measuring method of the inventionAO=3.712Ω，RBO=3.627 Ω. The ratio of the short circuit point to the whole coil is RAO/RAB=3.712/7.339=0.5058, total turns of wire side coil being 950 turns, short circuit can be determinedThe number of turns is 950 × 0.5058=480.5 turns, i.e. there is a short-circuit point in the middle of 481 turns, consistent with the actual maintenance situation.
Example 2: the single resistance of each coil on the national grid Wudongde converter +/-800 kV valve side is about 3.668 ohms, the total resistance of 70 coils and 66 coils is in a normal range, the four resistors are small and are respectively 2.751 ohms, 2.753 ohms, 2.940 ohms and 2.942 ohms, and the coil can be determined to have at least two short-circuit points. R can be measured by the measuring method of the inventionAO=1.841Ω、RBO=1.828Ω、RCO=2.213Ω、RDO=1.453 Ω. The ratio of one short circuit point to the whole coil is RAO/RAB=1.841/3.669=0.5018, and the ratio of the short-circuit point to the whole coil is RCO/RCD=2.231/3.666=0.6086, the total number of turns of the coil on the valve side is 199 turns, and the number of short-circuit turns at two positions can be determined to be 199 × 0.5018=99.9 turns and 199 × 0.6086=121.1 turns respectively, namely, one short-circuit point is at the end of 100 turns, and the other short-circuit point is at the end of 122 turns, which is consistent with the actual maintenance condition.
The two examples are consistent with the actual maintenance condition, and the method can accurately find out the position of the short-circuit point of the transformer coil and provides convenience for maintenance.
Claims (2)
1. A method for measuring a short-circuit point of a winding coil of a large transformer is characterized by comprising the following steps: measuring the direct-current resistance at the end A, B of the transformer by using a direct-current resistance meter and two direct resistance wires of the direct-current resistance meter; three direct resistance wires of a direct current resistance instrument are utilized to apply current to the end of a transformer coil A, B, and voltage is measured at the end of a transformer coil A, D, so that the A, O resistance, namely the resistance from a wire end to a short-circuit point, can be accurately measured; similarly, current is applied to the end of the transformer coil A, B, and voltage is measured at the end of the transformer coil B, D, so that the B, O resistance, namely the resistance from the end of the wire to the short-circuit point, can be accurately measured; by comparing the measured contact resistance without a short-circuit point with the contact resistance with a short-circuit point, the short-circuit position can be determined more accurately.
2. A large scale transformer coil as claimed in claim 1Method for assembling short-circuit points of a coil, characterized in that the short-circuit position is determined: the ratio of the short circuit point to the whole coil is RAO/RABOr RBO/RAB。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911182154.6A CN110888084A (en) | 2019-11-27 | 2019-11-27 | Method for measuring short-circuit point of winding coil of large transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911182154.6A CN110888084A (en) | 2019-11-27 | 2019-11-27 | Method for measuring short-circuit point of winding coil of large transformer |
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| CN110888084A true CN110888084A (en) | 2020-03-17 |
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| CN201911182154.6A Pending CN110888084A (en) | 2019-11-27 | 2019-11-27 | Method for measuring short-circuit point of winding coil of large transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608147A (en) * | 2021-08-18 | 2021-11-05 | 安徽兆晟新能源科技有限公司 | Transformer short-circuit resistance detection device |
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| CN209069965U (en) * | 2018-08-23 | 2019-07-05 | 国网天津市电力公司电力科学研究院 | DC Resistance Test of Transformer rapid wiring device |
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2019
- 2019-11-27 CN CN201911182154.6A patent/CN110888084A/en active Pending
Patent Citations (12)
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| JP2009300250A (en) * | 2008-06-13 | 2009-12-24 | Sanyo Special Steel Co Ltd | Method of inspecting excitation winding |
| CN101871960A (en) * | 2009-04-23 | 2010-10-27 | 特变电工股份有限公司 | Test method of transformer |
| CN102023259A (en) * | 2009-09-23 | 2011-04-20 | 东莞华仪仪表科技有限公司 | Method for improving measuring accuracy and correcting measuring range of ground resistor |
| CN102707189A (en) * | 2012-05-31 | 2012-10-03 | 卧龙电气集团股份有限公司 | Method for determining short-circuit position of parallel-wound wires of transformer coil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608147A (en) * | 2021-08-18 | 2021-11-05 | 安徽兆晟新能源科技有限公司 | Transformer short-circuit resistance detection device |
| CN113608147B (en) * | 2021-08-18 | 2024-06-11 | 安徽兆晟新能源科技有限公司 | Transformer short circuit resistance detection device |
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