FIELD: electricity.
SUBSTANCE: short circuit (SC) current is recorded at the input of feeding transformer and in outgoing lines; according to invention, SC current is simultaneously recorded at the input of feeding transformer and in outgoing lines; position of the switch of outgoing line in which SC occurred is controlled; voltage on section of buses of feeding transformer is controlled, and if SC current is present also at the input of feeding transformer, and in one of outgoing lines, and after it has been switched off with the protection, the switch of this line remained in switched on position, at that, there is no voltage on the section of buses of feeding transformer, there can be made the conclusion that SC occurred in outgoing line and its switch failed; in this case the automatic load transfer prohibition signal is supplied. In case of SC on buses of feeding transformer there simultaneously recorded is SC current at the input of feeding transformer and in outgoing lines; in case there is no SC current in outgoing lines, and in case there is SC current at the transformer input, there can be made the conclusion that SC occurred on buses of feeding transformer and the automatic load transfer prohibition signal is supplied.
EFFECT: improving reliability of the method and enlarging functional capabilities.
3 dwg
