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US 4,584,445 AGranted
Vacuum interrupter
AssigneeMeidensha Corporation
InventorsYoshiyuki Kashiwagi, Yasushi Noda, Kaoru Kitakizaki
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AssigneeMeidensha Corporation
InventorsYoshiyuki Kashiwagi, Yasushi Noda, Kaoru Kitakizaki
Estimating the term…
A vacuum interrupter of more improved large current interrupting capability and dielectric strength is disclosed. The interrupter has a pair of separable contact-electrodes (13, 24), a vacuum envelope (4) generally electrically insulating and enclosing the pair therewithin, a contact-making portion (19) of 20 to 60% IACS electrical conductivity being a part of one contact-electrode (13) of the pair and being into and out of engagement with the other contact-electrode (24) of the pair, an arc-diffusing portion (20) of 2 to 30% IACS electrical conductivity being the other part of the one contact-electrode (13) and being electrically and mechanically connected to the contact-making portion (19) so as to be spaced from the other contact-electrode (24) when the contact-electrodes (13, 24) are into engagement, and means (14, 15) for applying an axial magnetic field in parallel to an arc established between the contact-electrodes (13, 24) when separated.
A vacuum interrupter comprising a pair of separable contact-electrodes (13, 24), each of which consists of a disc-shaped arc-diffusing portion (20) and a contact-making portion (19) projecting from a central portion of an arcing surface of the arc-diffusing portion (20), a vacuum envelope (4) which is electrically insulating and enclosing the contact-electrodes (13, 24), and means for applying a magnetic field (14, 30) in parallel to an arc established between the contact-electrodes (13, 24) when said contact-electrodes are separated, wherein said arc-diffusing portion (20) of at least one (13) of the contact-electrodes (13, 24) is made of material of 2 to 30% IACS electrical conductivity and said contact-making portion (19) of said at least one contact-electrode (13) is made of material of 20 to 60% IACS electrical conductivity.
Dependencies are inferred from the claim text.