A monitoring system for sf6 circuit breaker

Abstract

This application discloses a SF6 circuit breaker monitoring system, including a DC power supply, a first intermediate relay, a second intermediate relay, an SF6 density controller and a microcomputer protection measurement and control device. When the SF6 density controller detects that the SF6 in the monitored SF6 circuit breaker When the gas pressure value is lower than the pressure alarm setting value, the first group of normally open contacts of the SF6 density controller is closed, the coil of the first intermediate relay is energized, the normally open contacts of the first intermediate relay are closed, and the microcomputer protection measurement and control device Output low air pressure alarm signal; when the SF6 density controller detects that the SF6 gas pressure in the monitored SF6 circuit breaker is lower than the set value of the pressure blocking action, the second group of normally open contacts of the SF6 density controller closes, and the second middle The coil of the relay is energized, the normally open contact of the second intermediate relay is closed, and the microcomputer protection measurement and control device outputs a low air pressure blocking signal.

Description

technical field [0001] The present invention relates to SF 6 The technical field of circuit breakers, more specifically, relates to a SF 6 Circuit breaker monitoring system. Background technique [0002] SF 6 The circuit breaker is an insulating medium circuit breaker, which belongs to the air blowing circuit breaker like the air circuit breaker, SF 6 SF used in circuit breakers 6 Compared with other insulating media, gas has strong advantages in insulation performance, arc extinguishing performance and chemical performance. Therefore, SF 6 Circuit breakers have developed rapidly in recent years. [0003] If SF 6 Gas leakage will cause SF 6 The gas pressure in the circuit breaker drops, when the pressure drops to a certain value, SF 6 The circuit breaker will not allow opening and closing operations, so SF 6 Whether the gas pressure is normal will become a restrictive link that affects the safety and stable power supply of electrical equipment. [0004] Currently g...

AI Technical Summary

Problems solved by technology

Due to the practice of regular inspections, it is impossible to grasp SF in real time 6 SF in circuit breaker 6 In the case of gas pressure, therefore, there exists SF 6 Breaker SF when not patrolled 6 Safety hazards of gas leakage

Another approach is to adapt the gas monitoring technology to SF 6 SF inside the circuit breaker 6 Gas pressure is monitored in real time, but due to imperfect technical measures and poor stability of the monitoring system, the SF 6 The gas monitoring effect cannot meet the requirements

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