Importance

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Abstract

A status indicating system for the instantaneous registration of the open and closed states of the switches of a remotely supervised high tension plant comprising a multiplicity of substations each having a plurality of high tension switches which require monitoring and supervision, wherein each switch is provided with two pilot indicating contacts signalling the respective switch position of off and on, said pilot indicating contacts delivering signals to a remotely located central supervision station by means of a long distance transmission circuit where the signals are monitored. In the status indicating system every high tension switch is provided with two proximity switches registering its end positions. The proximity switches are damped by a vane which is moved by an operating shaft of the high tension switch. The two possible outputs of activated proximity switches are always different from zero and these outputs actuate pilot indicating contacts by means of pilot relays. The status of each high tension switch is characterized by the contrary positions of a pair of pilot indicating contacts belonging to said high tension switch and the positions of the pilot indicating contacts and the contrarity of said contact pair are supervised at the central supervising station.

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First Claim