Non-invasive winding temperature measurement method for forced oil circulation air-cooled layer winding transformer

Abstract

The invention relates to a non-invasive winding temperature measurement method of a forced oil circulation air-cooled layer winding transformer. The controller and the oil pump controller are connected together to collect corresponding data in real time, and at the same time input the transformer structural parameters, winding type, and structural size parameters; establish the heat balance equation between the forced oil circulation air-cooled layer winding transformer winding and the transformer oil; calculate Winding temperature of forced oil circulation air-cooled layer winding transformer. Aiming at the characteristics of the forced oil circulation air-cooled layer winding transformer, the present invention comprehensively considers the surface oil temperature of the transformer, the winding current, the cooling mode and the operation of the forced oil circulation air-cooled cooler, so as to measure the winding temperature of the transformer under various working conditions It is more accurate, which is conducive to transformer operation and maintenance personnel to grasp the operation status 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 layer 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 layer 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 accur...

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Problems solved by technology

Since the forced oil circulation air-cooled layer 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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