Summary
The replacement of SF₆ in high-voltage circuit breakers remains one of the most challenging transitions in power transmission technology. While multiple alternative insulation and interruption concepts have been introduced over the past decade, none provides a universal oneto-one replacement across all voltage levels, operating conditions, and applications. Each alternative presents trade-offs related to size, operating pressure, low-temperature performance, mechanical complexity, and environmental footprint.
Read more Read lessAmong the available alternatives, C₄F₇N-based gas mixtures are currently the only solution with commercially available products covering the full range of high-voltage applications. When properly engineered, such solutions are capable of fulfilling all mandatory IEC and IEEE requirements without reliance on relaxed test interpretations or exemptions.
This paper summarizes the development experience of a C₄F₇N-based high-voltage circuit breaker platform at 420 kV / 63 kA (50 Hz) and 362 kV / 63 kA (60 Hz), focusing on a doublechamber interruption concept equipped with grading capacitors and pre-insertion resistors.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A3_12259_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Switzerland |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
SUTHERLAND Timothy - HD Hyundai Electric Switzerland; GOTTI Manuel - HD Hyundai Electric Switzerland; PANDYA Kedar - HD Hyundai Electric Switzerland; MANTILLA Javier - HD Hyundai Electric Switzerland; STOECKLI Marcel - ELECTROSUISSE / CIGRE Switzerland NC Secretary
Keywords
C4F7N, double-chamber, HVCB, high voltage circuit breakers, grading capacitors
