A non-invasive winding temperature measurement method for oil-immersed air-cooled cake winding transformer

Abstract

The invention relates to a non-invasive winding temperature measurement method of an oil-immersed air-cooled cake-type winding transformer, which combines an oil-immersed air-cooled transformer cake-type winding temperature measuring and controller with an oil surface thermometer installed on the oil-immersed air-cooled cake-type winding transformer , current transformer, ambient thermometer, and air-cooled 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 an oil-immersed air-cooled cake-type winding between the transformer winding and the transformer oil The heat balance equation; Calculate the winding temperature of the oil-immersed air-cooled cake winding transformer. Aiming at the characteristics of the oil-immersed air-cooled cake-type winding transformer, the present invention fully considers various influencing factors such as the surface oil temperature of the transformer, the winding current, the structural form of the transformer, the structure and size of the cake-type winding, the cooling method and the operation of the cooling fan, etc., so that The measurement of the winding temperature under various working conditions of the transformer is more accurate, which is conducive to the operation and maintenance personnel of the transformer 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 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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