Abstract When the SF6 gas pressure in GIS circuit breaker is too low, the switch on and off operation of the circuit breaker should be blocked by density relay and its contact. Aiming at the problem that the density relay contacts are not reliable in the current blocking scheme, a new improvement scheme of SF6 air pressure low blocking circuit is proposed, which can solve the hidden danger in the original locking circuit simply and effectively. The utility model has the advantages of simple on-site construction and small transformation difficulty, and has certain practical value for production, operation and maintenance.
2021, Vol. 22 
