Transcription of replacing SF in high voltage circuit breakers
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replacing SF in high voltage circuit breakers
Alstom Grid///Spring/Summer 2013 21 Almost all modern high voltage circuit breakers running at transmission voltage levels employ sulphur hexafluoride (SF6) as an arc-extinguishing medium for current interruption and for dielectric insulation between the terminals. This is because of the excellent interrupting capabilities of SF6, combined with a high dielectric with-stand. However, SF6 is a greenhouse gas with high global warming potential. Several countries have initiated policies to ban or limit its use Australia, for instance, has raised a tax of AUS$450 per kg on imported SF6 and other countries are likely to follow. Anticipating this trend, Alstom has worked on a solution to provide a high voltage circuit breaker with no SF6.
a high voltage circuit breaker with no SF 6. The most promising approach is the use of vacuum technology for interruption, already used in medium voltage applica- ... in high voltage circuit breakers While SF 6 is widely used in power transmission, allowing manufacturers
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