Temperature rise characteristic field testing method of thermal simulation device of transformer winding temperature controller

Abstract

The invention relates to a temperature rise characteristic field testing method of a thermal simulation device of a transformer winding temperature controller. The method comprises the following steps of: 1) keeping the temperature bulb of the temperature controller and an electric heating element in the thermal simulation device to be normally installed on a transformer, and when the internal temperature of the shut-down transformer drops to be consistent with ambient temperature, reading the indicated temperature value of the temperature controller and recording the temperature value as T1; 2) according to parameters such as the rated load current of the transformer and the transformation ratio of a current transformer, calculating and determining the magnitude of testing heating current Ih and outputting the current to the temperature controller through a constant-current source device; 3) after the indicated temperature value of the temperature controller is stabilized for 45 minutes, reading the indicated temperature value and recording the temperature value as T2; and 4) calculating temperature rise delta T=T2-T1 produced by the thermal simulation device of the temperature controller under the condition of the heating current Ih corresponding to the load current of the transformer which is I, so as to obtain the temperature rise characteristic. The temperature rise characteristic field testing method of the thermal simulation device of the transformer winding temperature controller has the advantages that the problem that the temperature rise characteristic of the thermal simulation device of the temperature controller cannot be tested in the field at present is solved, and the accuracy and the reliability of the measurement of the winding temperature controller in service are guaranteed.

Description

technical field [0001] The invention relates to a field test method for temperature rise characteristics of a thermal simulation device for a power transformer winding thermostat (hereinafter referred to as thermostat). Background technique [0002] When the power transformer is running, the winding temperature is directly related to the insulation capacity and life of the transformer. The transformer winding temperature controller is used to measure and monitor the winding temperature of the transformer, and is an important measurement and protection device to ensure the safe operation of the transformer. The temperature controller uses a "thermal simulation" technology device to measure the temperature difference of the copper oil of the transformer. The accuracy of the temperature rise characteristics of the thermal simulation device is directly related to the accuracy of the winding temperature measurement, and its characteristics need to be confirmed through regular tes...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for on-site testing of the temperature rise characteristics of the thermal simulation device of the transformer winding thermostat. At present, the temperature controller cannot be tested for the temperature rise characteristics of the thermal simulation device in the on-site calibration

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