Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1987-01-30
1988-06-07
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01H 3366
Patent
active
047498307
ABSTRACT:
Contact pieces for vacuum switchgear comprise a base material with additives of readily vaporizable components to produce a sufficiently conductive switch path in the switch-off process. It is desired to have an overvoltage-free switching behavior for the vacuum switchgear. The additives are concentrated in a firmly adhering layer covering the switching surface of the contact piece. Such contact pieces can be manufactured in particular by direct fusing of the additives on the surface, by fusing a separate application of the additives in powder form, in granulate form or as foil or sheet on the surface or alternatively by vapor deposition of the additives on the switching surface of a given contact piece body of base material. Advantageously, a CuCr contact piece base material is used.
REFERENCES:
patent: 2975255 (1961-03-01), Lafferty
patent: 3596027 (1971-07-01), Okutomi et al.
Elektrotechnik "Schalten von Hochspannungsmotoren," 66/22, Nov. 1984, pp. 16-23, by K. Stegmuller.
Hess Rudiger
Kippenberg Horst
Muller Reiner
Paulus Irmo
Schnodt Hannelore
Macon Robert S.
Siemens Aktiengesellschaft
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