Operation Technology Principle of SF6 Gas Density Relay

Ⅰ. Operation technical principle of SF₆ relay

ⅰ. SF₆ relay is a SF₆ gas package that is connected with SF₆ gas in the circuit breaker and sealed on the outside of the big bellows. It is checked with the standard gas package sealed on the inside of the big bellows through the lever with the central axis as the support point, and drives the micro switch electrical contact to act to realize the function of sending alarm and locking signals.

ⅱ. If SF₆ gas pressure in the circuit breaker reaches the rated pressure, when the temperature of the air chamber and the external environment temperature is equal, the SF₆ gas on the outside of the bellows is in the same state as standard SF6 on the inside of the bellows. The lever supported by the shaft is kept in a balance position, so that the electrical contact of the micro switch is in the open position. With the change of the ambient temperature, the pressure of SF₆ gas on both sides will change at the same time. As a result, the lever supported by the shaft is still kept in a balanced position, and the electrical contact of the micro switch will be still kept in the open position.

ⅲ. If the SF₆ gas circuit breaker leakage, the pressure of the SF₆ gas outside the bellows will decrease, while the pressure of the standard SF₆ gas pack inside the bellows will remain constant, and the lever will be out of balance. As a result, both ends will rotate counterclockwise to reach a new equilibrium position. When the air leaks to a certain extent, it will make the electrical contacts of the microswitch with different functions closed respectively, and send different instructions or signals to achieve their different functions

ⅳ. When the temperature of SF₆ gas inside the circuit breaker reaches a balance with the external ambient temperature, the density or pressure value indicated will not change with the change of the external ambient temperature. When the ambient temperature rises, the temperature of SF₆ gas inside the circuit breaker rises slowly, it will drive the pointer to the direction of density or pressure value increase.

Ⅱ. SF₆ relay supplier

Lanso Instruments INC. is a professional supplier of SF₆ relays and has developed more than 20 patented solutions, ranging from remote SF₆ gas monitoring systems to micro water detectors. Welcome to contact us.

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