FIELD: electricity.
SUBSTANCE: short circuit (SC) current is registered at the input of supply transformer (ST) and in outgoing lines. Short circuit current is registered at the input of supply transformer between input breaker and automatic load transfer breaker. SC current is registered at the same moment of time in outgoing lines. Position of breaker in outgoing line, where short circuit occurred, is monitored. Voltage is monitored on section of supply transformer buses. And if SC current is both available at ST input and in one of outgoing lines, and after its disconnection by protection the breaker of this line remained in connected position, besides there is no voltage on section of ST buses, conclusion is made that short circuit occurred in outgoing line and its breaker failed. In this case automatic reclosure prohibition signal is sent.
EFFECT: improved reliability of method by monitoring of outgoing lines breakers position after short circuit has occurred in them, expansion of method functionality, increased service life of automatic reclosure breaker, reduction of expenses for its repair and maintenance.
2 dwg
