Oil sampling apparatus of nitrogen-filled oil-immersed transformer and corresponding method

Abstract

The invention provides an oil sampling apparatus of a nitrogen-filled oil-immersed transformer and an oil sampling method. The nitrogen-filled oil-immersed transformer comprises a transformer and is characterized in that an oil drain valve pipeline of the transformer is provided with a pressure gage and a stop valve, a nitrogen cylinder is connected with a pipeline located between the pressure gage and the stop valve through a connection pipe, and the connection pipe is equipped with a nitrogen valve. According to the invention, improvement is made on the basis of an original oil drain valve pipeline, so the problem that an oil sample cannot be taken out due to ageing of an insulating material caused by suck-back of air into the interior of the transformer easily occurred during oil sampling of the nitrogen-filled oil-immersed transformer is overcome; the oil sampling apparatus provided by the invention has reasonable and practical design, is simple to operate and convenient and fast in oil sampling, substantially improves reliability and security and only takes 5 min in the whole operation; moreover, a reconstructed pipeline part can be integrally or partially dismounted and movably used, so the oil sampling apparatus is applicable to oil-immersed transformers filled with gas.

Description

technical field

[0001] The invention relates to the technical field of oil-immersed transformers, in particular to an oil sampling method for a nitrogen-filled oil-immersed transformer and a corresponding device. Background technique

[0002] The main function of the transformer in the power system is to transform the voltage to facilitate the transmission of power. The most common are oil-immersed transformers, where the oil tank is filled with transformer oil. The role of transformer oil: 1. Insulation, isolating the air, and avoiding the insulation reduction of components due to contact with air and moisture. 2. Protect the iron core and winding components, and delay the erosion of oxygen on insulating materials. Three, cooling effect. 4. Arc suppression effect. In order to judge the internal conditions of oil-immersed transformers, it is necessary to take oil samples regularly for withstand voltage, physical and chemical tests.

[0003] Most oil-immersed transformer...

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