FIELD: physics.
SUBSTANCE: invention is related to relay protection of lines, which are shunted by parallel or bypassing connections, and with data exchange on actuation of protection sets in the line ends. Method consists in the following: in case of short circuit (SC) in protected line, in disconnecting metering device of the set in the end of the line, with high current of external circuit in relation to this end, not only the current of the line itself in this end is summarized, but also the currents of parallel and bypassing connections, which stretch from this end of protected line and shunt it; and in the disconnecting metering device of the set in the end of the line with low or zero current of external circuit in relation to this end, the currents of parallel and bypassing connections of electric circuit that stretch from this end of protected line and shunt it, are subtracted from the current of the line itself in this end.
EFFECT: improves fast action, sensitivity of disconnecting metering devices and reliability of protection action.
2 dwg
