In the case of the HTS power cable is used instead of a conventional
power cable, the operational characteristics of circuit breaker
are similar under a single line-to-ground fault condition.
However, the HTS power cable is not interrupted under three
phase short circuit fault condition, because the fault current is over
the critical current, the HTS power cable is quenched and the resistance
of HTS power cable is increased, and it makes the fault detection
impossible. Consequently, the correction of protective relay is
required for the quench properties of HTS power cable for secure
operation of protective relay.