On-load tap changer explosion-proof system and transformer

Abstract

The invention relates to an on-load tap changer explosion-proof system, which comprises a pressure release device installed on an on-load tap changer, connected with an oil cavity of the on-load tap changer, used for monitoring the pressure of the oil cavity and provided with a preset threshold value; the oil-gas separation device is connected with the pressure release device, when the pressure in the oil cavity is larger than a preset threshold value, the pressure release device communicates with the oil cavity and the oil-gas separation device, and oil gas in the oil cavity is discharged after passing through the oil-gas separation device; and the gas isolation device is in communication connection with the pressure release device, and when the pressure of the oil cavity is larger than a preset threshold value, the pressure release device controls the gas isolation device to spray an inert cooling medium to the on-load tap changer. The explosion-proof system of the on-load tap changer can quickly release the pressure in the on-load tap changer, and can quickly isolate the fault position through the fireproof medium, thereby further reducing the risk of fire and explosion of the on-load tap changer, and improving the safety of equipment.

Description

technical field [0001] The invention relates to the technical field of transformer protection devices, in particular to an explosion-proof system for an on-load tap changer and a transformer. Background technique [0002] The on-load tap changer (hereinafter referred to as the switch) is one of the essential key components of the power transformer. It is subjected to the combination of complex stresses such as electricity, heat, force, and vibration for a long time during operation, and the operating conditions are very harsh. The switch is the only component that moves frequently in the transformer. An UHV DC transmission project accumulates about 200,000 tap-changer actions each year, and the mechanical action stability is extremely high. A gear switch needs to be strictly followed by the design sequence to complete 8 mechanical switches of 6 parts within 0.1 second, and the total time change of the action should not exceed 0.01 second. Once the timing error of adjacent m...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a solution for the problem that the on-load tap changer cannot withstand the huge internal pressure when the internal oil pressure changes rapidly, resulting in a large amount of oil and gas leaking from the top cover or pressure relief valve, which will cause combustion and explosion. An on-load tap changer explosion-proof system and a transformer that improve the above-mentioned defects

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