Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1982-09-28
1984-12-04
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 50A, 200148B, H01H 3354, H01H 3350
Patent
active
044866348
ABSTRACT:
A ground test switch comprises a terminal plate electrically connected to a movable contact member but electrically insulated from a closed vessel enclosing a high-voltage conductor, a grounding conductor disconnectably electrically connecting the terminal plate to a member maintained at ground potential, and a locking device locking the movable contact member against movement when the grounding conductor is detached from the connecting position. The operator may forget to mount the grounding conductor in the switch again after a ground test. Such a trouble can be readily detected because the movable contact member is locked against movement.
REFERENCES:
patent: 2660694 (1953-11-01), Cuttino
patent: 3089928 (1963-05-01), Rexroad
patent: 3249708 (1966-05-01), Johnson
patent: 3778574 (1973-12-01), Clark
patent: 3898412 (1975-08-01), Robinson et al.
Miwada Satoshi
Nakano Haruji
Hitachi , Ltd.
Macon Robert S.
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