Dielectric strength of a vacuum interrupter contact gap after making current operations
[ 1 ] Instytut Elektroenergetyki, Wydział Elektryczny, Politechnika Poznańska | [ P ] pracownik
2003
artykuł naukowy
angielski
- dielectric strength
- breakdown voltage
- vacuum interrupter
- vacuum contact gap
- switching operation
- making current
- contact welding
- contact surface
- prebreakdown current
EN Experimental results concerning the breakdown voltage and prebreakdown current of a vacuum interrupter contact gap, after making current operations, are presented. The dielectric strength of the contact gap is lowest for a switching sequence during which a making of high current is followed by a no-load contact opening. The breakdown voltage is much lower than after making operation, followed by interruption of a sufficiently high current. The basic process of breakdown initiation appears to be field electron emission from a specific structure on the contact surface, created by weld rupture.
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