FIELD: electricity.
SUBSTANCE: since fault current surge in line of main power supply source count-down is started for protection operation delay of input bus circuit breaker of main power supply source; if at the end of count-down a new fault current surge occurs then conclusion is drawn about interruption of input bus circuit breaker. Monitoring pulse is sent to the beginning of main power supply source line and time of its travel to reflection point and back is being measured. Distance to reflection point is measured and when it is bigger than distance to installation point of line fuse then conclusion is drawn that fault current occurs behind line fuse; if at that line fuse and main circuit breaker failure occurred than signal is sent to prohibit bus and mains automatic load transfer.
EFFECT: functionality enhancement.
2 dwg
