Double voltage detecting method for transformer drum type winding

Abstract

The invention discloses a double voltage detecting method for a transformer drum type winding. The method comprises the following specific steps that testing voltage is changed into a 380V voltage added to one side of the transformer drum type winding, and the other side of the transformer drum type winding is connected with a 0.2-level measuring voltmeter; the transformer drum type winding obtains variable-ratio error between a first side voltage V1 obtained from one-time actual measurement of the voltage meter and a second side voltage V2 obtained after secondary actual measurement; the obtained variable-ratio error is compared with the national standard, and when the measurement error value exceeds a standard scale, if the measurement error value is larger than 0 positive error, the low-voltage turns will be lack of N turns or the high-voltage turns will be redundant with iN turns, and if the measurement error value is less than 0 negative error, the low-voltage turns will be redundant with N turns or the high-voltage turns will be lack of iN turns. By the adoption of the technical scheme, the test precision can be guaranteed, and the safety of the operation detection test can be ensured; whether the transformation ratio error is within a prescribed range or not can be obtained through comparison with the national standard, and the number of and the position of the error ofthe transformer winding turns can be found out.

Description

technical field [0001] The invention relates to a dual-voltage detection method for the turns of a transformer cylindrical winding, which is applied to the technical field of detection of the turns of the transformer cylindrical winding. Background technique [0002] Transformer quality inspection tests are divided into major categories such as factory test, handover test and preventive test according to the purpose. The number of test items contained in each category varies and the requirements are different. The transformation ratio test is an important basic test item required by the above-mentioned various types of tests. One of the purposes of the transformation ratio test is to detect whether the number of turns and the voltage ratio of each winding of the transformer are normal. [0003] The conventional transformation ratio test can only measure the error of the winding or the turns ratio of the winding, but cannot determine the turn error of a specific winding, incl...

AI Technical Summary

Problems solved by technology

[0006] (1) Introduce high-voltage transformers and other equipment with potential high-voltage electric shock hazards. The test voltage is generally above 1,000 volts, and the operation is highly dangerous.

[0007] (2) Precision instruments are required, and although the measuring instruments used are very precise (0.2-level voltmeter, 0.1-level voltage transformer), the measurement accuracy still cannot meet the measurement requirements

If in the worst case, these errors are superimposed, only the equipment measurement error is 0.5%, plus the parallax may exceed the allowable value stipulated by the national standard, and the test accuracy is difficult to guarantee

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