Device used for thermal stability and temperature rise test of transformer sleeve

Abstract

The invention provides a device used for the thermal stability and temperature rise test of a transformer sleeve. The device comprises a target temperature preset unit, a real-time temperature measuring unit, a real-time temperature display unit, a temperature comparison and control output unit and a relay unit. In the thermal stability test and temperature rise test, the real oil temperature in a closed test oil tank is measured in real time, and the heating efficiency of the device can be adjusted by the temperature comparison and control output unit according to the temperature needed by the test, so that the device can ensure that the oil temperature in the oil tank in the thermal stability test can be kept at 90 DEG C plus or minus 2 DEG C, and the oil temperature in the temperature rise test can be kept to be higher than the ambient temperature by 60 DEG C plus or minus 2 DEG C under the unattended condition.

Description

technical field [0001] The invention belongs to the technical field of high-voltage insulation, and in particular relates to a device for thermal stability and temperature rise tests of transformer bushings. Background technique [0002] The national standard GB / T 4109-2008 "Insulated bushings with AC voltage higher than 1000V" and the IEC standard IEC 60137:2003 "Insulated bushings for alternating voltages above 1000 V" stipulate that when the transformer bushing is subjected to a thermal stability test, it needs to be sealed The transformer oil temperature in the insulating oil tank is heated from the ambient temperature to 90°C ± 2°C; when performing the temperature rise test, the oil temperature in the insulating oil tank needs to be heated to 60°C ± 2°C higher than the ambient temperature. [0003] Usually, the thermal stability test lasts for tens of hours, and the oil temperature in the insulation test oil tank is required to be kept at 90°C±2°C during the whole test ...

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Problems solved by technology

[0007] 2) During the thermal stability test and temperature rise test, since the fuel tank is completely sealed, the conventional oil temperature measurement method cannot place the probe inside the fuel tank;

[0008] 3) The conventional oil temperature measurement method is usually obtained by measuring the oil tank wall or inserting a thermometer in the oil level seat, which cannot achieve accurate and live measurement;

[0009] 4) Although the three conventional heating methods of electric heater heating method, fuel tank iron loss induction heating method and oil filter heating method can raise the oil temperature to the temperature required for the test, the heating efficiency can only be adjusted manually

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