FIELD: electricity.
SUBSTANCE: invention is used in the field of power engineering. According to the method when the first surge of short-circuit current appears in the main source line time of its flow is measured, since the moment of short-circuit current switching off the countdown is started for delay time of the network reserve switching on, at that in the line of reserve power supply source the second current surge is controlled and if at the countdown ending a surge of operating current appears with value defined by load of the reserved section in the line of the main power supply source and time of the first surge flow is equal to the delay time of actuation for the main circuit breaker in the line of the main source then conclusion is made that the main and sectionalising circuit breakers are switched off and the network reserve is switched on successfully when the line section between switched off switches is damaged. When the second surge of short-circuit appears, which is cut off in delay time for actuation of the network reserve protection with speed-up and the time of the first surge flow is equal to the delay time for actuation of the sectionalising circuit breaker then conclusion is made about switching off of the sectionalising circuit breaker and unsuccessful switching on of the network reserve switch at damage of the line section of the main source placed adjacent to the network reserve switch.
EFFECT: enlarging functional capabilities of the method.
3 dwg
