Double voltage detecting method for transformer drum type winding

A detection method and transformer technology, applied to instruments, measuring devices, measuring electrical variables, etc., can solve the problems that the measurement accuracy cannot meet the measurement requirements, the test accuracy is difficult to guarantee, and the operation risk is high, so as to reduce the operation risk, The effect of ensuring safety and reducing the measurement range

Inactive Publication Date: 2018-11-02
ANHUI SHENHONG TRANSFORMER
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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 voltmet...

Method used

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  • Double voltage detecting method for transformer drum type winding

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Embodiment Construction

[0021] The invention discloses a dual-voltage detection method for the number of turns of a transformer barrel winding. The specific steps are as follows:

[0022] S1. Change the test voltage to add a 380V voltage to one side of the transformer barrel winding, and connect the other side of the transformer barrel winding to a measuring voltmeter, so that a lower voltage can be obtained, which reduces the measuring range of the measuring instrument , improve the measurement accuracy, but also reduce the risk of operation;

[0023] For example: 30kVA transformer adopts 10KV test voltage, measured with 0.2 grade voltmeter, its minimum resolution is 20V, the present invention uses 380V test voltage instead, uses 0.2 grade voltmeter to measure, its minimum resolution is 0.76V, can guarantee test accuracy ;

[0024] S2. The primary side voltage V1 of the transformer barrel winding is measured by the voltmeter once, and the secondary side voltage V2 is obtained after the second measu...

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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...

Claims

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Application Information

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IPC IPC(8): G01R29/20
CPCG01R29/20
Inventor 吴红
Owner ANHUI SHENHONG TRANSFORMER
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