TOKYO, Dec 9, 2024--- Hitachi, Ltd. announced today that it received an order for five units of Hitachi Energy's sulfur hexafluoride- free EconiQ 300 kilovolt circuit-breaker from Chubu Electric ...

HV circuit breakers use a number of different insulating media, and specialized design techniques to extinguish arc in the most efficient manner. Table 1 shows a comparison of the different media.

In a historical milestone for the power industry, GE Renewable Energy’ s Grid Solutions unveiled the world’ s first 420 kV, 63 kA g³ gas-insulated substation circuit-breaker prototype. This ...

Also, SF6 circuit breakers required much less maintenance, and it didn’t have the limitations of OCB devices. To be fair, in those days, there wasn’t much talk about global warming or greenhouse gas ...