Pressure relief valve for oil-immersed transformer and oil-immersed transformer

Abstract

The invention provides a pressure relief valve for an oil-immersed transformer and an oil-immersed transformer. The pressure relief valve for the oil-immersed transformer comprises a valve body communicated with a transformer and a valve cover arranged on the valve body; the pressure relief valve is characterized in that a ventilation channel is arranged on the valve cover; a pressure relief port is arranged on a side wall of the valve body; the pressure relief port is communicated with an oil storage bottle through a backflow pipe; the oil storage bottle is communicated with the outside air through a ventilation window on an oil storage cover; a valve plug is arranged at a pipe port of the valve body; the upper end of the valve plug is limited by the pipe port of the valve body; the lower end of the valve plug stretches into a cavity of the valve body; a gap is reserved in the inner side wall of the valve body; a sealing ring is arranged at the lower end of the valve plug; an elastic reset mechanism is arranged between the valve plug and the valve cover; when the valve plug is arranged at a first limiting position, the sealing ring is located above the pressure relief port; and when the valve plug is arranged at a second limiting position, the sealing ring is located below the pressure relief port. The pressure relief valve is thorough in pressure relief, high in sensitivity, capable of preventing the waste of cooling oil, and beneficial to the addition of the cooling air.

Description

technical field [0001] The invention relates to a pressure relief valve, in particular to a pressure relief valve for an oil-immersed power transformer; the invention also relates to an oil-immersed transformer. Background technique [0002] Existing oil-immersed power transformers generally include a casing and a transformer component placed inside the casing. The transformer component is mainly composed of an iron core and coil windings wound on the core, and the transformer component is placed in the transformer shell. inside the body and seal it with a cap. [0003] There are generally multiple windings on the transformer core. During the working process of the transformer, current passes through the coil and generates heat. If the coil is not cooled in time, the coil will overheat and the transformer will be damaged. For this reason, current transformers generally use liquid cooling oil for cooling. The specific method is to pour the cooling oil into the cavity sur...

AI Technical Summary

Problems solved by technology

Although this structure can play a certain role in pressure relief, it often requires a lot of pressure to open the valve pad. That is to say, the pressure relief can only be completed when the internal pressure of the transformer reaches a high level, and there is a problem of incomplete pressure relief. defect

Furthermore, the pressure relief structure can only be used for pressure relief. When the internal pressure of the transformer suddenly increases, the cooling oil in the transformer is usually sprayed out, and the sprayed cooling oil cannot be recovered, resulting in waste of oil.

In addition, when the cooling oil in the transformer is reduced, it is necessary to disassemble the valve cover and valve pad of the pressure relief valve, and add cooling oil through the valve body, which is very inconvenient to operate due to the thinner nozzle of the valve body

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