FIELD: electricity.
SUBSTANCE: invention is related to automatics of electric circuits. Method consists in the fact that from the moment of appearance of the first short-circuit current inrush (s.c.) in busbars of transformer that supplies the line, time count is started equal to time of sectionalizing circuit breaker protection actuation, at that moment of disconnection of the first short-circuit current inrush is controlled, and if the moment of time count completion coincides with the moment of disconnection of the first short-circuit current inrush, then fact of sectionalising circuit breaker disconnection is established, at that from the moment of disconnection of the first short-circuit current inrush time delay of automatic reclosure is started, at that appearance of the second current inrush with value that exceeds normal operating value but less than short-circuit current or equal to short-circuit current is controlled, and if in the moment of automatic reclosure time delay count completion there is no current inrush with value of more than normal operating value, but less than short-circuit current or equal to short-circuit current, then after that fact of disconnection and failure of automatic reclosure of sectionalising circuit breaker installed in ring line.
EFFECT: expansion of functional resources of sectionalising circuit breakers.
2 dwg
