Non-intrusive winding temperature measurement method for oil-immersed air-cooled pie winding transformer

Abstract

The invention relates to a non-intrusive winding temperature measurement method for an oil-immersed air-cooled pie winding transformer. The method comprises the following steps: connecting an oil-immersed air-cooled transformer pie winding temperature measurement and control instrument with an oil level thermometer, a current transformer, an environmental thermometer, and an air-cooled controllerinstalled on the oil-immersed air-cooled pie winding transformer together, collecting corresponding data in real time, and synchronously inputting transformer structural parameters, winding types, andstructure size parameters; establishing a heat balance equation between an oil-immersed air-cooled pie winding transformer winding and transformer oil; and calculating the winding temperature of theoil-immersed air-cooled pie winding transformer. According to the non-intrusive winding temperature measurement method for the oil-immersed air-cooled pie winding transformer provided by the invention, for the characteristics of the oil-immersed air-cooled pie winding transformer, various influencing factors such as the surface oil temperature of the transformer, the winding current and the transformer structural form, the structure and size of a pie winding, the cooling mode and the operation of a cooling fan, etc. are fully considered, so that the measurement of the winding temperature undervarious working conditions of the transformer is more accurate, and the transformer operation and maintenance personnel can master 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 measuring method of an oil-immersed 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 oil-immersed air-cooled cake-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 s...

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Problems solved by technology

Since the oil-immersed air-cooled cake-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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