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

Abstract

The invention discloses a non-intrusive type winding temperature measurement method of an oil-immersed air-cooling layer type winding transformer. The oil-immersed air-cooling transformer layer type winding temperature measure and control instrument is connected with an oil surface thermometer, a current transformer, an environment thermometer and an air-cooling controller, and the corresponding data is collected in real time, and then the transformer structure parameter, the winding type and the structure size parameter are input; a thermal equilibrium equation is established between the oil-immersed air-cooling layer winding transformer winding and the transformer oil; and then the winding temperature is computed according to the surface oil temperature winding temperature, the average temperature rise on the inner oil by the winding, the average temperature on the surface oil by the inner oil, and a layer correction value. For the characteristics of the oil-immersed air-cooling layer type winding transformer, the winding current, the transformer structure size, the winding type, the external environment temperature, the cooler type, the working state and various influence elements are comprehensively considered, the measurement on the winding temperature by the transformer under various working conditions is more accurate, and the transformer operation state can be timely mastered by the transformer operation and maintenance personnel.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a non-invasive winding temperature measurement method of an oil-immersed 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 oil-immersed 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 struct...

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Problems solved by technology

Since the oil-immersed 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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