Transformer winding material identification method based on resistance temperature coefficient

A technology of temperature coefficient of resistance, transformer winding, applied in the direction of material resistance, etc., can solve the problems of irreversibility, low accuracy, time-consuming and labor-intensive

Inactive Publication Date: 2015-11-25
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST +1
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Problems solved by technology

However, this method is time-consuming, laborious, inaccurate and irreversible

Method used

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  • Transformer winding material identification method based on resistance temperature coefficient
  • Transformer winding material identification method based on resistance temperature coefficient
  • Transformer winding material identification method based on resistance temperature coefficient

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Embodiment Construction

[0021] like figure 1 As shown, a transformer winding material identification method based on the temperature coefficient of resistance, the steps are:

[0022] 1) Place the transformer to be tested in a high-temperature test box (20-100°C), and arrange 4 temperature measurement points around it, namely: top oil temperature point, winding joint point, front bottom point, back top point, by measuring this The temperature of the transformer winding is judged by the temperature of the four points; change the temperature of the high temperature test box, and when the temperature of the transformer is completely stable, that is, the temperature of the four temperature measurement points is the same and is consistent with the set temperature of the test box, it is measured by the DC resistance tester of the transformer. DC resistance of the transformer winding;

[0023] 2) Data analysis of the measured transformer winding DC resistance values ​​at different temperatures:

[0024] T...

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Abstract

A transformer winding material identification method based on a resistance temperature coefficient comprises the steps: firstly, placing a to-be-detected transformer in a 20-100 DEG C high-temperature test box, arranging four temperature measuring points respectively being a top oil temperature point, a winding connector point, a front side bottom point and a back top point at the periphery of the transformer, and determining the temperature of a transformer winding through measuring the temperatures of the four points; then changing the temperature of the high-temperature test box, and after the transformer temperature is completely stable, namely the temperatures of the four temperature measuring points are the same and consistent with the set temperature of the test box, measuring the direct-current resistance of the transformer winding through a transformer direct-current resistance tester; and then carrying out data analysis on the measured direct-current resistance values of the transformer winding at different temperatures. Through measuring the direct-current resistance values of the transformer winding at the different temperatures, the material of the winding is identified from the change condition of the resistance values. The measuring principle is simple, judgment accuracy is high, and no hang cover is needed so as to avoid destroying of insulation of the winding.

Description

technical field [0001] The invention belongs to the technical field of transformer winding material identification. Background technique [0002] In power transformers, especially 10kV distribution transformers, there has been a long-term phenomenon of using aluminum wires instead of copper wires. Especially in recent years, due to high copper prices at home and abroad, the number of aluminum winding transformers has shown a trend of substantial increase. At present, there is no limitation on the material of the transformer winding, but it is required that if the aluminum winding is used, it must be clearly marked on the transformer model. At present, most of the aluminum winding transformers on the market belong to the situation that the manufacturers have secretly replaced the windings from copper wires to aluminum wires in order to save costs, and power users do not know when purchasing and operating. [0003] Due to the difference in the characteristics of copper and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/14
Inventor 周年荣黄星张林山毛天常亚东杜林唐魁
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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