Load break switch

Electricity: circuit makers and breakers – Liquid contact – Time delay

Patent

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Details

200324, 200153G, 335 76, H01H 330

Patent

active

047135050

ABSTRACT:
A compact load break switch having at least one vacuum interrupter connected between two terminals carried by respective insulating bushings through a current exchange assembly. The vacuum interrupter is disposed within one of the insulating bushings, and a current exchange insulating housing having portions which extend telescopically into both insulating bushings, provides adequate creepage distance through air from the vacuum interrupter and the current exchange assembly to a grounded housing for the load break switch. Also, a current transformer is disposed about the insulating housing to provide remote indication of the flow of fault current through the current exchange assembly. The switch operating mechanism includes: a torsion spring which when fully charged, is capable of opening and closing the switch several times; a motor driven spring charging mechanism, for fully recharging the torsion spring after each switch operation; a solenoid actuated latch mechanism which may be remotely actuated to open or close the switch; a lockout mechanism for preventing closure of the switch when the torsion spring has insufficient stored energy to open the switch thereafter without being recharged; auxiliary switches for remote indication of the position of the load break switch; and manually-opened mechanisms for recharging the torsion spring and operating the load break switch.

REFERENCES:
patent: 2846621 (1958-08-01), Coggeshall
patent: 3227244 (1966-01-01), Pelenc
patent: 3470750 (1969-10-01), Wetter
patent: 3592991 (1971-07-01), Turner et al.
patent: 4237357 (1980-12-01), Opfer
patent: 4253003 (1981-02-01), Evans et al.
patent: 4293834 (1981-10-01), Date et al.
patent: 4343030 (1982-08-01), Date et al.

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