FIELD: electricity.
SUBSTANCE: in the method when short circuit (SC) current appears, sounding pulse is supplied to the line beginning, travel time of that pulse to SC point and back is measured, distance from the line beginning to SC point is calculated and sectionalising circuit breaker which shall be switched off is determined; then when SC disappears, sounding pulse is supplied, the second distance is determined, compared to the distances at which sectionalising circuit breakers are located from the line beginning, and if the second measured distance is equal to the distance to sectionalising station which shall be cut off, the fact of selective cutoff of the damaged section of the line is established, and if the second measured distance is equal to the distance to one of sectionalising circuit breakers located before sectionalising station which shall be cutoff, the fact of non-selective cutoff of damaged section of the line is established.
EFFECT: enlarging functional capabilities of the method by obtaining the information on selective or non-selective cutoff of damaged section of the line equipped with breakers provided with automatic reclosure device and automatic load transfer device.
2 dwg
