Gas insulated metal enclosed switchgear

Abstract

A gas insulated metal enclosed switchgear is equipped with a bus-bar chamber, a circuit breaker chamber and a cable chamber, the bus-bar chamber is equipped with a pressure releasing window (A), and the circuit breaker chamber is equipped with a pressure releasing window (B). The pressure releasing windows (A and B) are both communicated with an upward pressure releasing channel, the pressure releasing channel is communicated with the atmosphere via a top cover pressure releasing hole, and a bus-bar chamber pressure releasing port is branched out of the top cover pressure releasing hole. A horn-like pressure releasing channel is arranged outside the bus-bar chamber pressure releasing window, and a first bending force reduction unidirectional opening enclosing device is arranged outside the circuit breaker chamber pressure releasing window. The cable chamber is equipped with a pressure releasing port, and the pressure releasing port passes a second bending force reduction unidirectional opening enclosing device and then is communicated with the pressure releasing channel. The structure of the enclosing devices is that a box or plate covers the pressure releasing window or the pressure releasing port, one edge of the box or plate is fixed, and a plurality of bending force reduction square hole grids which are parallel with the fixed edge are arranged on the plate surface inside the fixed edge. According to the gas insulated metal enclosed switchgear of the present invention, when an internal arc occurs, the mutually independent compartments of the switchgear and the adjacent switchgears operate independently and do not influence mutually, and the equipment are safe and reliable.

Description

technical field [0001] The invention relates to a gas-insulated metal-enclosed switchgear, in particular to a gas-insulated metal-enclosed switchgear with mutually independent pressure relief channels. Background technique [0002] According to national standard requirements and user requirements: the IAC level (internal fault current magnitude and short-circuit duration) should be taken as the key indicator of switchgear design, and the allowable duration of internal fault arc should not be less than 0.5 seconds. The circuit breaker room, busbar room and cable room should be equipped with independent pressure relief channels and pressure release devices, and the nozzle of the pressure release device should be directed away from inspection channels and other equipment. Since the switchgear is only accessible to authorized personnel, there are operation or maintenance channels on the front, back and side of the switchgear, and authorized personnel may touch the front, back ...

AI Technical Summary

Problems solved by technology

[0007] In this way, when an internal arc is generated in the circuit breaker chamber, after the high-temperature and high-pressure gas is discharged through the pressure release window B, when part of the high-temperature and high-pressure gas cannot be discharged in time through the pressure relief hole of the top cover, it will expand downward, and the high-temperature and high-pressure gas will expand downward. The gas will damage the pressure release window A of the busbar chamber and cause the failure of the busbar chamber; similarly, when an internal arc occurs in the busbar chamber, after the high-pressure gas is discharged through the pressure release window A, the high-temperature and high-pressure gas cannot be discharged in time through the pressure relief hole of the top cover , it will expand downward, damage the pressure release port B of the circuit breaker, and cause the circuit breaker chamber failure

That is to say, when an internal arc is generated in any compartment of the circuit breaker room and the busbar room, it will affect each other, and even further expand the scope of the accident, failing to achieve the purpose of rapid maintenance and rapid recovery of equipment

[0008] What's more, when an internal fault occurs in the cable room, since the cable room of the existing equipment is not provided with a pressure relief channel extending into the top of the cabinet, the high-temperature and high-pressure gas will expand in the cable room, which will damage the weak link of the cable room; When the high-temperature and high-pressure gas is discharged from the rear cover of the cable room, because the position of the rear cover of the cable room is relatively low, the high-temperature and high-pressure gas will hurt the personnel maintaining the passage behind the cabinet, posing a safety hazard; if the high-temperature When the high-pressure gas is discharged from the cable room toward the front cabinet, the high-temperature and high-pressure gas will enter the front cabinet, thereby damaging the operating mechanism of the circuit breaker in the front cabinet, the operating mechanism of the isolating switch and the instrument room, causing a short circuit in the secondary line or causing a fire , the pressure generated by the high-temperature and high-pressure gas can even open the front door, hurting the personnel maintaining the passage in front of the cabinet, failing to meet the standard requirements and user requirements, and the safety hazard is more prominent; it may even affect the operation of adjacent cabinets or the entire station switch cabinet

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