A Classified Pressure Relief Mechanism for Electric High Voltage Switchgear

Abstract

The invention discloses a power high-voltage switch cabinet graded pressure relief mechanism, which comprises a cabinet top cover, a pressure relief through groove, a hinge support, a top plate, mounting buckles, a nylon bolt and a sealing ring I. The pressure relief through groove is formed in the middle of the front face of the cabinet top cover, and the hinge support is fixedly mounted at the inner bottom of one edge of the pressure relief through groove. By additionally arranging a secondary pressure relief plate on the existing top plate and mounting the secondary pressure relief plate ona pressure bearing steel plate through a pressure relief tension spring, fault gas pressures can be divided into three grades, namely the impact gas pressure which can be borne by an operator, the impact gas pressure which cannot cut off the nylon bolt, and the impact gas pressure which can cut off the nylon bolt, correspondingly, pressure relief is carried out by opening a cabinet door by the operator, pressure relief is carried out in the modes that fault gas jacks the secondary pressure relief plate and passes through a gap opening between the secondary pressure relief plate and the top plate through a vent hole, and pressure relief is carried out by shearing the nylon bolt and completely opening the top plate, so that the different fault gas pressures can be relieved in a graded modeto improve safety performance of pressure relief of the fault gas of a power distribution cabinet.

Description

technical field [0001] The invention relates to power distribution equipment technology, in particular to a graded pressure relief mechanism for a high-voltage electric switchgear. Background technique [0002] Power high-voltage switchgear is an important part of high-voltage power distribution equipment. According to its internal functions, it mainly includes main busbar room, circuit breaker handcart room, cable room, instrument room, secondary terminal room, etc., of which the main busbar room, Both the handcart room and the cable room of the circuit breaker have a primary charged body. When a short-circuit fault occurs inside the circuit breaker, the primary charged body will generate an arc, and the internal pressure of the switch cabinet will rise. It is necessary to release the high temperature and high pressure gas generated by the fault to prevent high temperature. The high-pressure gas breaks through the partition, causing damage to the indoor components of the ad...

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Problems solved by technology

[0004] However, it is also due to the fact that the bending of the metal roof completely opens the high pressure of the faulty high-temperature gas. When the pressure of the faulty gas does not reach the shear force required to cut the nylon bolts, the faulty gas cannot be removed in time, which may easily cause the pressure of the faulty gas. Backlog, and it is easy to cause the threat of impact damage to the staff who are about to open the closed cabinet door for maintenance, and the safety performance cannot be fully reflected. Therefore, a graded pressure relief mechanism for electric high-voltage switchgear is proposed to solve the above problems

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