Summary
This paper presents the development and testing of a 245 / 300 kV, 63 kA circuit breaker and switchgear designed to operate at both 50 and 60 Hz, utilising the standard eco-friendly gas mixture (CO2/O2/C4-FN) as an alternative to SF6 (the most potent greenhouse gas currently known). Motivated by the growing demand for sustainable solutions in high-voltage switchgear, the project aims to address environmental concerns while maintaining performance standards expected by the industry. The paper details the development process, gives an overview of the executed tests, and demonstrates how combining voltage ratings can streamline product qualification and accelerate market readiness. The circuit breaker’s performance under various test scenarios—representative of real-world operational stresses—demonstrates its robustness for integration into modern power networks. The environmental implications of the chosen approach are shown: combining ratings positively influences the overall ecological footprint, not only development cost and time.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A3_12261_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Switzerland |
| Study committees | |
| File size | 437 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
TEPPATI Valeria - Hitachi Energy Switzerland; COSTANTINO Francesco - Hitachi Energy Switzerland; NUREDINI Matjan - Hitachi Energy Switzerland; FREI Peter - Hitachi Energy Switzerland; DHOTRE Mahesh - Hitachi Energy Switzerland; TILLIETTE Vincent - Hitachi Energy Switzerland; STOECKLI Marcel - ELECTROSUISSE / CIGRE Switzerland NC Secretary
Keywords
C4-FN mixture, circuit breaker, controlled closing, current interruption, dielectric, dead-tank breaker, gas insulated switchgear, high voltage, SF6 alternatives, SF6-free, short line fault, shunt reactor switching, terminal fault, voltage withstand
