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Method for detecting error mode in number of turns of transformer windings

A technology of transformer winding and error mode, applied in the field of transformer coil, can solve the problems of unstable accuracy, large workload, slow detection method, etc., and achieve the effect of obvious benefits and simplified operation process.

Inactive Publication Date: 2017-07-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quality inspection tests of transformers are divided into major categories such as factory tests, handover tests, and preventive tests according to their uses. The number of test items contained in each category varies and the requirements are different. The transformation ratio test is an important part of the above-mentioned tests. One of the basic test items of the transformation ratio test is to detect whether the turns and voltage ratio of each winding of the transformer are normal, but the conventional transformation ratio test can only measure the error of the turns ratio of the winding or coil, and cannot determine the turns of a specific coil. Errors in the number of turns, including determining which coil has the wrong number of turns and the location and value of the error in the number of turns, and correctly judging the unqualified coil and the error in the number of turns is the basis for the follow-up process, which is very important, and the existing The detection method is slow, heavy workload, high investment, unstable accuracy, high requirements for personnel theoretical level and work experience, and limited application range

Method used

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  • Method for detecting error mode in number of turns of transformer windings
  • Method for detecting error mode in number of turns of transformer windings
  • Method for detecting error mode in number of turns of transformer windings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1, if the number of low-voltage turns of the transformer is N turns, and the single-pack transformation ratio of the transformer is k, then the number of low-voltage and high-voltage turns of the transformer is N and kN turns respectively, then δ=(k 实测 –k)÷k×100%

[0050] Among them: δ-----transformation ratio error embodiment 1

[0051] k 实测 -----The actual measured value of the transformation ratio

[0052] k ------ single package ratio of transformer

[0053] Let the number of high voltage error turns be N 高压误差匝数

[0054] k 实测 =kδ+k

[0055] deduced from this

[0056] N 高压误差匝数 = N k 实测 –kN=δkN Formula 2

[0057] Let the number of low-voltage error turns be N 低压误差匝数

[0058] k 实测 =kδ+k

[0059] From this it can be deduced

[0060] N 低压误差匝数 =N 实测 –N=kN÷(kδ+k)-N=N÷(1+δ)-N=-δ÷(1+δ)×N≈-δN Formula 3.

[0061] From the above derivation process, it can be concluded that the relationship between the transformation ratio error and the transformer t...

example 1

[0062] Example 1, Transformer parameters: model S11-80 / 6.3 capacity 80kVA, voltage ratio 6300±5% / 400V, connection group Dyn11, low voltage / high voltage gear I turns N / N1=51 / 1457 turns.

[0063] Test transformation ratio index during semi-finished product, obtain basic table 1-1 transformation ratio error value table; Utilize formula 1 of the present invention

[0064] Form table 2-2 the transformation ratio error value table of the single-phase winding inside the transformer;

[0065] Table 1-1 External transformation ratio error value table of transformer Table 1-2 Transformation ratio error value table of single-phase winding inside transformer

[0066] gear A i

B i

C i

gear A i

B i

C i

Grade I -2.39 -0.03 -2.39 Grade I -4.75 -0.03 -0.03 File II 2.39 -0.02 2.39 File II 4.80 -0.02 -0.02 Grade III 2.40 0.00 2.40 Grade III 4.80 0.00 0.00

[0067] The theoretical transformation ratio of single-phase ...

Embodiment 2

[0073] Embodiment 2: Transformer manufacturing parameters: model S11-80 / 6.3 capacity 80kVA, voltage ratio 6300±5% / 400V, connection group Dyn11, low voltage / high voltage gear I turns N / N1=51 / 1457 turns.

[0074] Test transformation ratio index during semi-finished product, obtain the transformation ratio error value table of table 2-1 foundation, utilize formula 1 of the present invention

[0075] Form table 2-2 the transformation ratio error value table of the single-phase winding inside the transformer;

[0076] Table 2-1 External transformation ratio error value table of transformer Table 2-2 Transformation ratio error value table of single-phase winding inside transformer

[0077] gear A i

B i

C i

gear A i

B i

C i

Grade I -0.03 -0.03 0.03 Grade I -0.03 -0.03 -0.03 File II -0.02 0.02 0.02 File II -0.02 -0.02 0.05 Grade III 0.00 0.04 0.04 Grade III 0.00 0.00 0.08

[0078] The Δ% is determined by t...

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Abstract

The invention relates to a method for detecting an error mode in the number of turns of transformer windings, which mainly solves a problem that the existing detecting method is slow in speed, heavy in workload, high in input and instable in accuracy. The method is characterized in that a transformation ratio error value of each single-phase winding inside a transformer is determined according to a transformation ratio error value measured outside the transformer, the error location and the error property of the single-phase windings are determined by contrasting the transformation ratio error value of each single-phase winding with an error mode lookup table, an error value can be worked out, and thus which coil inside the transformer goes wrong in the number of turns can be judged. The method has the characteristics of high detection speed and simple detection.

Description

technical field [0001] The invention relates to the technical field of transformer coils, in particular to a method for detecting errors in the number of turns of a transformer winding. Background technique [0002] Transformers are important power equipment widely used in production and life, and the annual manufacturing volume, operation maintenance volume, and repair volume are huge. The quality inspection tests of transformers are divided into major categories such as factory tests, handover tests, and preventive tests according to their uses. The number of test items contained in each category varies and the requirements are different. The transformation ratio test is an important part of the above-mentioned tests. One of the basic test items of the transformation ratio test is to detect whether the turns and voltage ratio of each winding of the transformer are normal, but the conventional transformation ratio test can only measure the error of the turns ratio of the wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/20H01F41/04
CPCG01R29/20H01F41/04
Inventor 阮万江应俊周洁
Owner BC P INC CHINA NAT PETROLEUM CORP
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