1. The gas density relay in the SF6 gas monitoring and leak alarm system is a SF6 gas package that is sealed on the outer side of the bellows 1 and connected to the SF6 gas in the circuit breaker. 6 is leveraged by using the shaft 5 as the support point, compared with the standard gas package 3 which is sealed on the outer side of the bellows 2, this will trigger the action of the micro switch electrical contact 4 to realize its signal and locking function.
2. When the circuit breaker exits, and the temperature of the SF6 gas in the circuit breaker at the rated density or pressure is equal to the ambient temperature, the state of the outside of the bellows 1 is the same as that of the outside of the bellows 2 standard SF6 gas monitoring package 3. The lever 6 with the support point of Axis 5 is maintained at a certain balance position, make the micro-switch electrical contact 4 at the opening position. With the change of ambient temperature, the pressure of both sides of the SF6, the lever acting at the supporting point of Axis 5 is still in a balanced position, and the electrical contact 4 of the micro switch remains unchanged at the open position.
3. When the circuit breaker exits, and the temperature of the SF6 gas in the circuit breaker is the same as that of the external environment, if the circuit breaker leaks the SF6 gas, the pressure on the outside of bellows 1 is reduced, the pressure of the standard SF6 gas monitoring package 3 on the outside of bellows 2 remains unchanged, and the lever 6 is out of balance, as a result, the two ends will rotate counter-clockwise to reach a new equilibrium position. When the air leaks to a certain extent, the electrical contacts with different functions of the micro-motion electrical contacts will be closed and different commands or signals will be issued, different functions are implemented.
SF6 gas monitoring and cable Online Monitoring: www.hddq.cn
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Introduction to working principle of SF6 gas monitoring Density Relay
