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IEVref:447-01-15ID:
Language:enStatus: Standard
Term: control relay
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Definition: electric relay, the function of which is to control equipment

Note 1 to entry: A control relay can be a simple relay that translates an external command into a control signal [e.g. a command to close a circuit-breaker], or it can be a more complex device that translates an external command into a number of sequential control signals [e.g. the closing and opening of disconnectors and circuit-breakers to changeover a circuit from one busbar section to another]. A control relay can also supervise a characteristic quantity (e.g. voltage, frequency) and produce a control signal that is dependent upon its specific functional design (e.g. under frequency load shedding relay).


Publication date:2020-05
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