Switchgear, switchgear installations and all devices installed in it for high voltage up to and including 52 kV are commonly referred to as “medium voltage”.
Applications – General
Which one is better, Vacuum or SF6 circuit breakers for medium voltage applications?
In the past there was a concern with Vacuum Circuit Breakers, however with materials and technologies utilised today should there be reason for concern?
Summary of circuit breaker comparison
- Switching devices with today’s technologies are basically equal for medium voltage application.
- SF6 now being phased out within many organisations due to environmental concerns, and under arcing SF6 by-products found to be of concern, special handling disposal requirements.
- Vacuum does have slight advantage with respect to life and maintenance due to the lower energy requirement mechanisms, as less force and less contact separation required.
- SF6 and Vacuum for typical distribution systems with standard distribution class circuit breakers can be supplied with up to 30% DC offset. This is generally acceptable where there are small generators connected to the system.
- For medium and larger sized generation applications, Generator type Vacuum of SF6 Circuit breakers can be supplied with up to 130% DC offset.
eVD4 – The Smart eVolution of ABB’s medium voltage breaker
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|Title:||Medium Voltage Switching Devices Selection for application and purpose – Information on Short Circuit Current Interruption – ABB|
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