Transformer oil heating device for high voltage bushing insulation test

Abstract

The present invention proposes a transformer oil heating device for high-voltage bushing insulation test, which includes: a test oil tank, the upper bottom surface of which is pierced with a high-voltage bushing for insulation test, and a shielding net is arranged inside the test oil tank. The shielding net is located at the lower side of the high-voltage bushing; the heating unit is arranged at the lower part of the test oil tank and is located at the lower side of the shielding net, and the heating unit is used for heating the transformer oil in the test oil tank. Heating; a control unit, arranged outside the test oil tank and connected to the heating unit, is used to control the heating unit according to the temperature of the transformer oil. The invention realizes the direct heating of the transformer oil inside the oil tank, and the heating effect of the oil temperature is relatively uniform. It is not necessary to lead the transformer oil to the outer circulation of the test oil tank for heating, and it is not necessary to wind a large current lead wire outside the oil tank, and it is not necessary to connect other equipment externally. Convenient and simple steps.

Description

technical field [0001] The invention relates to the technical field of high-voltage bushing insulation tests, in particular to a transformer oil heating device for high-voltage bushing insulation tests. Background technique [0002] High-voltage bushings are important equipment in power transmission projects. When the bushings are in normal operation, they are installed inside the boxes of high-voltage equipment such as transformers and reactors. The boxes of transformers and reactors are filled with insulating liquid, that is, transformer oil. and other insulating parts are immersed in oil to ensure the insulation performance of the equipment during operation. Before the bushing is put into operation, a number of insulation tests must be carried out to check the insulation performance of the bushing. In order to simulate the operating conditions of the bushing during the insulation test, the bushing needs to be installed in an oil tank for testing and filled with Transform...

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Problems solved by technology

[0005] 2. Existing heating methods are difficult to achieve accurate control of oil temperature

When using eddy current to heat the oil temperature, the heating effect is easily affected by the winding shape of the cable on the box wall. It may be that under the same applied current, due to the difference in the gap between turns during winding, the size of the eddy current generated is different, and the heating effect is also different. Same, large dispersion of heating effect

[0006] 3. The existing heating method cannot control the start or stop of the heating device in real time according to the oil temperature inside the tank

When the oil temperature rises to the temperature required for the casing test, the existing heating method requires people to artificially stop the oil filter or the eddy current heating system according to the oil temperature inside the tank measured by the temperature measuring device, and the test personnel are required to be on duty on site Monitoring oil temperature and operating equipment, wasting manpower and time

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