METHOD FOR DISCONNECTING SHORT-CIRCUIT CURRENTS IN POWER UNITS Russian patent published in 2003 - IPC

FIELD: power engineering; protection of power-unit generator circuits at thermal power stations. SUBSTANCE: power unit has series-connected generator, generator circuit breaker, transformer, and high-voltage circuit breaker, as well as relay protective devices for generator and power unit. Upon occurrence of short circuit current exceeding setting value is recorded. This current is checked and compared with second setting current equal to rated generator- disconnecting current value. In case current under check exceeds second setting current command is generated for disconnecting high-voltage circuit breaker, its disconnection is checked up, and signal is sent for disconnecting generator circuit breaker. In case current value under check is below second setting value command is sent for disconnecting generator circuit breaker. EFFECT: enhanced efficiency and operating flexibility of generator circuit breaker depending on short-circuit current value in generator circuits. 2 cl, 1 dwg