FAULT-CURRENT LIMITER APPLICATIONS IN MEDIUM-VOLTAGE AND HIGH-VOLTAGEPOWER DISTRIBUTION-SYSTEMS

Electronically triggered fault-current limiters have been used in medi um-and high-voltage power distribution systems to limit the available short-circuit current tu a lower level, so that the underrated switchg ear can be operated safely, However, to insure a safe and proper usage of these devices, the following major operating parameters need to be considered: 1) selection of trigger level; 2) selection of di/dt; 3) effect of the capacitor bank and stray capacitances; and 4) coordinati on between these devices and phase overcurrent (o/c) relays at the fau lted breaker, This paper will examine these major operating parameters , evaluate the performance of the current limiters tinder various simu lated fault conditions, and develop application guidelines fur current limiters.