Abstract
Power systems are becoming larger and larger for meeting electric power demand. Then it is becoming more difficult and more complex to design the stable systems where fault currents have to be less than breaking capacity of circuit breakers. For handling the increasing fault current due to expansion of power networks, superconducting fault current limiters, which are now being developed, are expected as one of the effective apparatuses to solve the above problem.
This paper describes a method of fault analyses of power systems with superconducting Fault Current Limiters. The method by use of symmetrical co-ordinates can analyse the asymmetrical fault condition where the line impedances are unbalanced when a fault occurs and Fault Current Limiters are operated.
