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The paper looks briefly at the development of vacuum interrupters to date, discusses limitations to the existing technology of Vacuum Switchgear, what these are, and also how these may be overcome. It then moves on to discuss new developments in Vacuum Interrupter/ Vacuum Circuit Breaker technology which are likely to have an impact on the next generation of devices. Finally, it looks forward ten...
Vacuum interrupters (VI) have proved extremely reliable over the past 60 years, but failure can occur, and is most often a consequence of loss of vacuum. If the vacuum pressure rises above a critical level, the dielectric strength of the vacuum collapses, resulting in functional failure of the vacuum interrupter. During manufacture the vacuum pressure of a VI is measured by stimulating an inverse...
Vacuum Interrupters (VI) have been the dominant switching device in medium voltage switchgear for the past 30 years. They have proved very reliable and many have been in service well beyond the 20 year service lives that manufacturers assigned to them. We have examined over 200 life-expired VI withdrawn from service for checking. The only end-of-life failure mechanism found was degradation of vacuum...
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