A pressure relief valve for power electrical transformers

Abstract

The invention relates to the field of power equipment, and discloses a pressure release valve for an electric power transformer. The pressure release valve comprises a valve pipe channel, a sleeve, avalve seat, a valve cylinder and a valve rod, wherein a driven plate is arranged at the top of an inner cavity of the valve cylinder; a positioning plate is arranged in the middle of the inner cavityof the valve cylinder; a spring is arranged between the positioning plate and the valve cylinder; and a first magnet and a second magnet with the same magnetic poles are respectively arranged betweenthe driven plate and the positioning plate. According to the pressure release valve, through the design of the first magnet, the second magnet and an electromagnet, when a valve core is moved upwardsby the instantaneous impact force in the transformer, an electric elastic sheet makes contact with an electric gasket before the spring bears the maximum limit , so that the electromagnet is electrified to generate suction force with the first magnet, the partial repulsive force of the first magnet to the second magnet is overcome, and the spring dose not bear the maximum pressure and is effectively buffered; and therefore, the spring can be effectively guaranteed to return to the initial state smoothly, and the release valve can be tightly closed.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to a pressure relief valve for electric power transformers. Background technique [0002] A power transformer is a device that converts an AC voltage (current) of a certain value into another voltage (current) with the same frequency or several different values. A common oil-immersed transformer consists of a thermometer, a moisture absorber, an oil standard, a storage Oil tank, pressure relief valve or explosion-proof tube, gas relay, high-voltage bushing, low-pressure bushing and other structures, among which, the pressure relief valve or explosion-proof tube is a device that releases the internal pressure of the transformer to prevent accidents from expanding. Because the explosion-proof tube is more advanced, its quality determines the anti-danger coefficient of the transformer. [0003] The working principle of the existing pressure relief valve is as follows: when the pressu...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a pressure relief valve for electric power transformers, which has the advantage of being convenient for buffering the instantaneous pressure in the transformer, and solves the technical problems mentioned in the background technology

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