For solving effectively the threat of the increasing current to power system

in this paper

the intelligentcontrol system

which is mainly composed of current limiting equipment and control system

for a new type of fast cir-cuit breaker with current limiting reactor is proposed. In case of normal operation of the system

the fast circuit break-er is closed and the reactor is bypassed. The fast circuit breaker has good breaking performance and its influence onthe system can be neglected. However

in case of fault in the line

the variation of current transformer in series in theline can be sensed by the data acquisition system. The breaking and closing commands are issued to the quick circuitbreaker after identification of the intelligent system so to achieve the purpose of current limiting. It is simulated andverified by the actual case that the intelligent control system can limit effectively short circuit current and avoid theinstability of the power system due to the increase of short-circuit current during the period of fault.