PRESSURE-REGULATING APPARATUS FOR TRANSFORMER

摘要

The present invention relates to a pressure-regulating apparatus for regulating the internal pressure of a transformer, wherein the passage of air introduced into or discharged from a pressure-regulating bag is divided to regulate the internal pressure of the transformer, to thereby improve pressure-regulating efficiency and to achieve a cooling effect. The apparatus for regulating the pressure of the transformer is filled with insulating oil to form an air layer in an upper portion of the transformer, and comprises: a connection pipe, one end of which has an external stopper through which outside air is introduced or discharged; an internal cylinder in communication with the connection pipe and first and second through-holes formed though an upper portion thereof, and which is arranged within the transformer such that a lower portion thereof is impregnated with the insulating oil; a pressure-regulating bag in communication with the internal cylinder via first and second connection portions connected to the respective first and second through-holes, and which is arranged in the air layer such that the pressure-regulating bag contracts or expands in accordance with the change in the internal pressure of the transformer; an air passage pipe, one end of which is inserted into the connection pipe and the other end of which is in communication with the second connection portion; and first and second open/shut means arranged at the respective ends of the first and second connection portions to enable air to flow in a single direction.