Superconducting fault current limiter development

Abstract

The authors'have developed and tested a 400V -lOOA class fault current limiter wound with AC superconducting wire having ultra-fine NbTi filaments. The limiter consists of noninductively wound superconducting mgger coils and a superconducting limiting coil which acts as a reactor. Excessive fault currents initiate quenching in the trigger coils and these currents, which have flown in trigger coils in non-fault condition, are commutated from the mgger coils to the limiting coil. In the experiment, the authors have succeeded in Iimiting a fault current level to 120A with the limiter whose terminal voltage at the limiting condition was 420V.

A Review on Development and Operational Strategy of Fault Current Limiters

“…Superconducting fault current limiters form one of the most novel techniques for protection in accordance with limiters. K.Okaniwa et al, [10] proposed a superconducting fault current limiter which was developed and tested in the year of 1991. Initially 400V-100A class 148 fault current limiter was developed which is wound with AC superconducting wire using NbTi filaments.…”

Modeling the Non Linear Behavior of a Magnetic Fault Current Limiter

“…The literature has extensive discussion of the range of approaches including Microprocessor control [2], an Electromagnetic method [3], Direct Cooled Tubular Element [4], a tuned LC circuit [5] and numerous papers investigating the use of superconductors including [6,7,8]. These techniques all suffer to some extent from being complicated, expensive and difficult to implement.…”

Power quality enhancement of isolated power systems through series compensation

“…One disadvantage of the non-superconducting current limiter is the power loss in the power electronics during normal operation. On the other hand, due to the low loss in the superconducting current limiter during normal operation, a device based on this limiter can be an attractive solution in controlling fault current levels in the power networks [67]. In the event of a fault, the superconducting current limiter ( lim L ) will produce an impedances due to their losing its superconductivity.…”