Sealing cover for oil immersing device of transformer

Abstract

The invention relates to a sealing cover for an oil immersing device of a transformer. The sealing cover comprises a cover plate, wherein a sealing blocking plate is fixedly arranged on the lower surface of the cover plate; a lower protruded part which is in shape of an inverted circular table is arranged at the lower part of the sealing blocking plate; side protruded parts which are provided witharc-shaped cross sections are correspondingly arranged at the left side and the right side of the upper part of the sealing blocking part; a main hydraulic chamber which is positioned between the twoside protruded parts is arranged in the sealing blocking plate; a hydraulic station is arranged at the outer part of the sealing blocking plate; a connecting pipe provided with an oil valve is arranged between the hydraulic station and the main hydraulic chamber; a pressure gauge for measuring hydraulic pressure in an inner chamber of the connecting pipe is arranged on the connecting pipe. The sealing cover can be closely combined with an oil immersing tank, is high in sealing performance and can be immediately recovered in case of slight air leaking in the midway, so that the rework in the midway of oil immersing work can be avoided; the oil immersing efficiency is high; both time and force can be saved; and the service life of the sealing cover is high.

Description

technical field [0001] The invention relates to a sealing cover for a transformer oil immersion machine, belonging to the technical field of transformers. Background technique [0002] The transformer manufacturing process generally needs to go through the process of oil immersion, general assembly, nitrogen filling and leak test. The purpose is to completely discharge the moisture and other impurities in the transformer body and detect whether there is oil leakage. Taking 500KV as an example, in order to reduce the dampness of the body during the general assembly process, the oil immersion process is required before the general assembly. After the tank is released, the cover is buckled, the vacuum is pumped to 40Pa, and the vacuum is maintained for 12 hours, and then the oil is filled to 200mm from the top, and continue to pump Vacuum for 12 hours, keep vacuum for 24 hours; in order to fully immerse the insulating parts in oil during the general assembly process, after the ...

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Problems solved by technology

[0003] It can be seen from the above that in the process of transformer manufacturing, it takes 72 hours to maintain the vacuum state. During this process, in order to ensure the tightness between the oil immersion tank and the cover plate in the oil immersion machine, rubber plugs are usually used to block the immersion tank. The mouth of the oil tank, and the rubber plug will age after long-term use, or other accidents will cause a slight air leak in the middle. Dust is sucked into the oil immersion tank, which will easily pollute the transformer being immersed in oil and reduce the quality of the finished product; therefore, in order to ensure the quality, the oil immersion operation must be reworked. Re-cleaning and cleaning the transformer is time-consuming and labor-intensive

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