Indian Queens 400kV Substation

This project was to replace two air-blast circuit breakers with new 400kV dead tank gas circuit breakers.

This particular gas circuit breaker was developed by Mitsubishi Electric for the UK market and the Indian Queens was chosen to be the first 400kV GCB installation in the UK. There are many benefits of using this dead tank gas circuit breaker including; current transformer being located at the base of the bushing resulting in eliminating the need for a foundation, structure and for a separate CT; significantly fewer gas sealing interfaces compared with live tank CB’s, vertical bushing arrangements for improved pollution performance, and the patented and unique Mitsubishi torsion spring operating mechanism.