FIELD: electricity.
SUBSTANCE: application: in the field of electric engineering. The technical result is expansion of functional possibilities. According to a method when short-circuiting surge occurs in the line of the main power supply source, the countdown is started, which is equal to the operation delay time for the MCB protection in this line, and if at the moment of this countdown completion the short-circuit current disappears then the conclusion is made about the MCB cut-off in the line of the main power supply source, since disappearance of the short-circuit current the countdown is started, which is equal to the operation delay time for switching of an automatic throw-over circuit-breaker, and when this time is over, in the line of the main power supply source operating current surge is controlled and if its value is lower that the value of the cut-off operating surge and equal to the value defined by the load connected to a section of the line of the main power supply source placed in adjacency to the automatic throw-over circuit-breaker, then the conclusion is made about spurious tripping of the sectionalising circuit-breaker.
EFFECT: suggested method allows receipt of data on emergency shutdown of the master circuit-breaker and spurious tripping of the sectionalising circuit-breaker in the ring network line.
2 dwg
