H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/327
H01H 9/16 (2006.01) H01H 9/00 (2006.01) H01H 31/02 (2006.01)
Patent
CA 1140968
ABSTRACT OF THE DISCLOSURE An improved indicator of the condition of an interrupting device in a high voltage circuit Released stored energy opens closed contacts of the device which is at line potential to prevent current flow. The energy is restored when the contacts close. A shunt trip, responding to circuit conditions or to remote command, can release the stored energy. Manual movement of an actuator can both also release the stored energy and reclose the contacts following their opening by the shunt-trip or by the actuator. Operation of the shunt-trip does not affect the actuator and vice versa. The indicator includes an arrangement at ground potential which mimics the putative condition of the contacts depending on the condition of the shunt-trip and the actuator. Specif- ically, the actuator responds to a lack of contact-opening operation of either the shunt-trip or the actuator by giving a sensible indication that the contacts are putatively open. Lastly, the indicator gives a sensible indication of any contact-closing operation of the actuator while such is taking place.
364184
Evans David M.
Sabis Richard J.
Osler Hoskin & Harcourt Llp
S&c Electric Company
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