Protection device for switchgear and its explosion-proof membrane

Abstract

The invention relates to a switch device and a protector for an explosion-proof film of the switch device. The switch device comprises a housing, an air hole in the housing, and the explosion-proof film on the air hole of the housing. The protector comprises an installing plate arranged outside the air hole of the housing of the switch device, and an installing hole corresponding to the air hole is arranged in the installing plate. The protector further comprises an end cap for plugging the installing hole to prevent external dust from falling onto the explosion-proof film, and the end cap is connected with the outer peripheral surface of the hole wall of the installing hole. The outer peripheral surface and the hole wall of the installing hole are connected through a weakening structure, so that the end cap can be blown up by air in the housing after the explosion-proof film ruptures. The housing of the switch device is thus protected.

Description

technical field [0001] The invention relates to a protective device, in particular to a protective device for a switchgear and its explosion-proof membrane. Background technique [0002] With the rapid growth of power demand, GIS (gas-insulated metal-enclosed switchgear) is widely used due to its compact structure, small footprint, strong environmental tolerance, safe operation, and beautiful appearance. The GIS is sealed with a metal shell, with conductors and parts inside, and the shell is filled with SF6 gas for insulation. If an arc occurs between the internal conductors and / or parts of the GIS due to short circuit or other reasons during operation, the internal temperature of the switchgear will rise sharply, and the internal air pressure of the switchgear will increase accordingly, eventually causing the internal pressure to exceed the withstand pressure of the shell ,explosion occurs. For safety considerations, air holes are generally provided on the shell of the GI...

AI Technical Summary

Problems solved by technology

If an arc occurs between the internal conductors and / or parts of the GIS due to short circuit or other reasons during operation, the internal temperature of the switchgear will rise sharply, and the internal air pressure of the switchgear will increase accordingly, eventually causing the internal pressure to exceed the withstand pressure of the shell ,explosion occurs

For safety considerations, air holes are generally provided on the shell of the GIS, and an explosion-proof membrane is arranged at the air hole. The pressure that the explosion-proof membrane can withstand is much lower than that of the shell. In order to ensure the overall safety of the switchgear, the GIS switchgear currently produced is basically not equipped with a protective device for protecting the protective film. When the external environment is harsh, such as a place with long-term sandstorms, the external dust will Accumulated on the explosion-proof membrane, thus affecting the performance of the explosion-proof membrane

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