Electricite De France - Service National

Michael Nassaeur

Patrick Bastard

Volker Leitloff

This device for protecting a line ( ) of a network of supply lines comprises two protective relays ( ) furnished with means for detecting faults and a circuit breaker adapted so as to disconnect the line from the network of lines in the presence of a fault, each relay being adapted so as to monitor a first zone (Z ) of the line corresponding to a zone of certain detection of a fault ( ) and at least one second zone (Z ) juxtaposed with the first zone and corresponding to a zone of uncertain detection of a fault. At least one of the relays comprises means for detecting the opening of the circuit breaker associated with the other relay in response to a detection, by the latter, of a fault in the first zone in such a way as to cause the opening of the circuit breaker associated with the said at least one relay ( ). The means for detecting the opening of the circuit breaker comprise means for calculating a characteristic representative of the variation of a measurement value of the impedance of the line and means for comparing this characteristic with a threshold value.

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Aachen, France

Michael Nassaeur