FIELD: electricity.
SUBSTANCE: invention is intended for use at line circuit-breakers at compensated power transmission lines (PTL). The device consists of a launcher comprising at least one voltage relay, a selective component fixing occurrence of open phase conditions, a time delay component as well as output relays actuating shutdown of the circuit-breakers neighbouring the switched-on line circuit-breaker in open phase mode with low time delay at significant increase of voltage at PTL.
EFFECT: limitation in development of resonant voltage increase at switched off phases of PTL equipped with shunt reactors in different open phase conditions at single joint of this line to distribution switchgear coupled, in its turn, to the electric system.
5 dwg
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