Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1986-01-30
1988-02-02
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200148R, 200308, H01H 3360, H01H 3342
Patent
active
047230584
ABSTRACT:
The present invention relates to a gas switch provided with a body case wherein a switching unit is installed and an arc-extinguishing gas such as sulfur hexafluoride (SF6) or the like is enclosed at a constant pressure, and an actuating mechanism for operating the switching unit. When a pressure of the arc-extinguishing gas comes lower than a predetermined value, a lock member is disposed to a working position whereat it engages with the actuating mechanism, the actuating mechanism is thus locked unoperatably, and a display member is ready for observing externally in accordance with a shift of the lock member. Operators then carry out works for maintenance and check of the gas switch as ensuring the state wherein a gas pressure drops in the body case and the actuating mechanism has been locked.
REFERENCES:
patent: 4442329 (1984-04-01), Gray et al.
Eguchi Isamu
Furuhata Takashi
Ito Fumio
Ito Hiromitsu
Mitsukuchi Kunio
Macon Robert S.
Takamatsu Electric Works, Ltd.
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