Expansion protecting device

Abstract

The invention discloses an expansion protecting device, which belongs to the technical field of expansion protecting devices of electric oil storage equipment. The expansion protecting device comprises an elastic body communicated with an inner cavity of an electric equipment sealed oil tank, and a pressure block is arranged on the upper surface of the elastic body. When in use of the expansion protecting device, oil is filled into the oil tank and the elastic body, the pressure block presses the elastic body, so that oil in the elastic body and the oil tank is applied with positive pressure, and leakage of external rainwater, air and the like to the oil tank is avoided. When the electric equipment is heated during running, the temperature of oil in the oil tank rises and the oil expands. Since the elastic body is communicated with the inner cavity of the sealed oil tank, the elastic body can expand along with expansion of the oil, and deformation of the oil tank is avoided effectively. Meanwhile, positive pressure in the oil tank can be controlled by utilizing different elastic bodies and pressure blocks, and the service life of the electric equipment can be prolonged. The expansion protecting device can be used on electric equipment with oil, such as transformers, reactors, mutual inductors and the like.

Description

technical field [0001] The invention relates to a protection device for oil storage electrical equipment. Background technique [0002] During the operation of small and medium-sized oil-immersed transformers, due to their own loss and heat generation, the volume of oil changes with the change of temperature. For transformers with an oil conservator, this change in oil volume is compensated by the oil conservator without causing an increase in the internal pressure of the oil tank. The disadvantage is that the oil is in direct contact with the air, and long-term operation will lead to a decrease in the insulation properties of the oil, and even due to the cooling and gradual accumulation of water vapor in the air, it will cause transformer operation accidents. [0003] The fully sealed transformer completely isolates oil and air, which solves the problem of direct contact between oil and air. The current common practice is to cancel the oil conservator, and the thermal exp...

AI Technical Summary

Problems solved by technology

The disadvantage is: the oil is in direct contact with the air, and long-term operation will lead to a decrease in the insulation properties of the oil, and even due to the cooling and gradual accumulation of water vapor in the air, it will cause transformer operation accidents

The problem found is: due to the material of the fuel tank and heat sink, as well as various factors such as design and manufacturing process, the elastic variation range of the fuel tank and radiator cannot be controlled within the specified range, and effective measurement cannot be carried out.

In practical applications, when the ambient temperature is high and the load is heavy, the fully sealed transformer will experience severe deformation of the oil tank and oil injection of the protection device, which seriously affects the safe operation of the transformer; the above defects not only appear in the transformer, but also in some other sealed oil storage systems. also appear in electrical installations

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