Non-intrusive winding temperature measurement method for forced oil circulation air-cooling cake type winding transformer

Abstract

The invention relates to a non-intrusive winding temperature measurement method for a forced oil circulation air-cooling cake type winding transformer. The method comprises the steps of connecting a cake type winding temperature measurement and control instrument of the forced oil circulation air-cooling transformer with an oil surface thermometer, a current transformer, an environment thermometer, an air-cooling controller and an oil pump controller and collecting corresponding data in real time, and meanwhile inputting a transformer structure parameter, a winding type and a structure size parameter; building a heat balance equation between the forced oil circulation air-cooling winding transformer and transformer oil; and computing a winding temperature of the forced oil circulation air-cooling cake type winding transformer. According to the method provided by the invention, aiming at the characteristic of the forced oil circulation air-cooling cake type winding transformer, the surface oil temperature of the transformer, the winding current, the cooling mode and the running condition of the forced oil circulation air-cooling cooler are comprehensively considered, so that the measurement on the winding temperature of the transformer under various working conditions is more accurate, and the operation and maintenance personnel of the transformer is facilitated to get the running state of the transformer in time.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a non-invasive winding temperature measurement method of a forced oil circulation air-cooled pie-type winding transformer. Background technique [0002] The operating temperature of the transformer plays an important role in judging the operating state of the transformer and the aging degree of the insulation, and is an indicator that needs to be paid close attention to in the operation and maintenance of the transformer. Since the forced oil circulation air-cooled pie-type winding transformer winding is wrapped in an oil-paper insulation system, its temperature is difficult to measure with an ordinary thermometer. At present, there are two commonly used temperature measuring devices for transformer windings. One is to directly measure the temperature of the winding parts with a built-in fiber grating and other temperature measuring devices in the transformer. This method is...

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Problems solved by technology

Since the forced oil circulation air-cooled pie-type winding transformer winding is wrapped in an oil-paper insulation system, its temperature is difficult to measure with an ordinary thermometer

At present, there are two commonly used temperature measuring devices for transformer windings. One is to directly measure the temperature of the winding parts with a built-in fiber grating and other temperature measuring devices in the transformer. This method is accurate, but the structure is complicated, which affects the insulation and sealing performance of the transformer; The other is to indirectly measure the winding temperature through the "thermal simulation" method, and calculate the temperature of the winding part by measuring the surface oil temperature of the transformer and the winding current. This method is easy to implement, but because only the influence of the winding current is considered, the measurement error is large. Big

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