High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Patent
1995-06-07
1996-03-26
Scott, J. R.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
200 82B, 218 84, H01H 3334
Patent
active
055022901
ABSTRACT:
A switching mechanism for use e.g. in a circuit breaker of an underground electric substation has a movable rod which causes opening and closing of an electrical contact and a hydraulic operating system. The hydraulic operating system uses a hydraulic fluid which has a high flammability temperature or is incombustible. Thus, even if such fluid leaks from the hydraulic operating system, the risk of fire or explosion is minimized. The hydraulic operating system may have a sealed tank for the fluid, preferably with a variable volume expansion chamber. In a further development, the hydraulic operating system and possibly parts of the movable rod, is enclosed in a casing which is sealed and is filled with a gas which does not support combustion therein. Thus, the risk of fire or explosion is further reduced. The casing may have a variable volume expansion chamber.
REFERENCES:
patent: 3633067 (1972-01-01), Dubois
patent: 3885454 (1975-05-01), Grieger et al.
patent: 3891862 (1975-06-01), Clark
patent: 4032820 (1977-06-01), Oishi et al.
patent: 4118613 (1978-10-01), Barkan et al.
patent: 4166937 (1979-09-01), Imam et al.
patent: 4384182 (1983-05-01), Imam
patent: 4417111 (1983-11-01), Kishi et al.
patent: 4461937 (1984-07-01), Boni
patent: 4514607 (1985-04-01), Lloyd et al.
patent: 4570043 (1986-02-01), Lloyd et al.
IEEE Transactions on Power Delivery, Y. Mukaiyama et al., "Development of a Perfluorocarbon Liquid Immersed Prototype Large Power Transformer with Compressed SF.sub.6 Gas Insulation," vol 6, No. 3, Jul., 1991, pp. 1108-1116.
Hydraulic Pneumatic Power, vol. 20, No. 229, Jan. 1974, Manchester GB pp. 12-14, T. I. Jones: `fire-retardant hydraulic fluids`.
Hirasawa Kunio
Koyanagi Osamu
Kurosawa Yukio
Ohshita Youichi
Sato Tadashi
Hitachi , Ltd.
Scott J. R.
LandOfFree
Switch mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switch mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switch mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-917561