Summary
To mitigate the high GWP of SF6 in the high-voltage industry, eco-efficient technology for high-voltage circuit breakers has been developed to contribute to the sustainable grid. Hitachi
Read more Read lessEnergy launched the world’s first 550 kV 63 kA SF6-free circuit breaker at CIGRE conference in 2024 and successfully delivered this SF6-free 550 kV Dead Tank Breaker (DTB) to customers in April 2025. During the same period, the world’s first 550 kV 63 kA SF6-free circuit breaker for Gas-Insulated Switchgear (GIS) has been announced by Hitachi Energy.
This paper will introduce the newly developed 550 kV SF6-free metal enclosed circuit breaker.
In summary, the development and delivery of the SF6-free 550 kV circuit breaker is a major milestone in the high-voltage industry to prove the scalability of the eco gas mixture covering voltage levels from sub-transmission to transmission networks. These advancements have paved the way for extending the environmentally friendly technologies to future ultra-highvoltage ratings.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A3_11501_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | China, People's Republic of |
| Study committees | |
| File size | 573 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
KONG Fei - Hitachi Energy; LIU XiaoHao - Hitachi Energy; YANG Yong - Hitachi Energy; ZHENG MengLei - Hitachi Energy; TEPPATI Valeria - Hitachi Energy; YANG Chen - Hitachi Energy; KOTILAINEN Sami - Hitachi Energy; VOSS Robert - Hitachi Energy; BUJOTZEK Markus - Hitachi Energy
Keywords
C4-FN mixtures, circuit breakers, CO₂/O₂/C4-FN, DTB, eco gas mixture, GIS, high voltage, SF6-free, switchgear, pre-insertion resistor
