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Distribution transformer coil material nondestructive testing method

A technology for distribution transformers and non-destructive testing, applied in the direction of material resistance, to achieve the effects of improving measurement accuracy, suppressing errors, and simple methods

Active Publication Date: 2014-12-31
ELECTRIC POWER RES INST STATE GRID JIANGXI ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can judge the material of the distribution transformer, the method is complicated.

Method used

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  • Distribution transformer coil material nondestructive testing method
  • Distribution transformer coil material nondestructive testing method
  • Distribution transformer coil material nondestructive testing method

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Embodiment Construction

[0043] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] The dimensions of the distribution transformer in the embodiment of the present invention are as follows: figure 1 with figure 2 As shown, referring to the size measurement diagram of the distribution transformer, first measure the volume of the fuel tank for the size mark of the sampling transformer. The specific method is to use a tape measure to measure the length, width, and height of the upper and lower parts of the distribution transformer once, and take the average value. If the volume of the oil tank of the test distribution transformer exceeds 30% of the conventional distribution transformer, the test distribution transformer can be preliminarily judged that its coil is an aluminum transformer.

[0045] Such as image 3 As shown in the block diagram of the non-destructive testing process of the coil material of the distribution transformer, the te...

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Abstract

The invention discloses a distribution transformer coil material nondestructive testing method, the detection method comprises a distribution transformer fuel tank volume discrimination method and a resistance temperature coefficient method. According to the invention, by a fuel tank volume for measuring distribution transform, compared with data in a routine fuel tank volume table, if the fuel tank volume for testing distribution transform exceeds the routine distribution transform by 30%, and the fuel tank is a suspected aluminum core transformer. The resistance temperature coefficient method is characterized in that a resistance temperature coefficient K value is measured and calculated to determine the coil material, on the basis of a distribution transform coil temperature model, the invention employs a multi-point linear regression method to inhibit random error generated in a test, and thereby the measure precision of K value can be increased. A multitime test result proves that a principle of the material detection method based on coil resistance temperature coefficient is correct, and the method is feasible. The invention is suitable for the nondestructive test of the distribution transformer material.

Description

technical field [0001] The invention relates to a non-destructive detection method for the coil material of a distribution transformer, which belongs to the technical field of distribution transformer detection. Background technique [0002] Product quality is the foundation of power grid security, and product quality supervision is the guarantee for the effective supply of materials. Recently, due to the large price difference between copper and aluminum, the phenomenon of substituting aluminum for copper in distribution transformer coils has been repeatedly banned, which has brought great hidden dangers to the safe and stable operation of the power grid. Copper is generally used for the outer layer of aluminum-substituting copper distribution transformers, and aluminum is used for the inner layer coils. It is difficult to identify the material without disassembling the coil. The single capacity of distribution transformers is generally below 2000kVA. In order to reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/14
Inventor 孙旻云潘本仁余侃胜章叔昌王华云
Owner ELECTRIC POWER RES INST STATE GRID JIANGXI ELECTRIC POWER CO
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