if the capacity of casting system increases or if the fault current is large then the existing circuit breaker may have to be replaced by now one with a high capacity .
But since the replacement of circuit breaker may prove to be only. the current limiting reactor are used to limit the fault current to same value. The current limiting reactor with large value of inductance
Design of current limiting reactor is such a that they do not saturated due to high SC current Reactor with iron core may saturated due to high SC also they we most economical. Hence as air reactor are used.
