TRANSIENT ANALYSIS OF HTS INDUCTIVE FAULT CURRENT LIMITER

High temperature superconductors (HTS) have been considered for curren t limiting devices based on the fast transition from the superconducti ng state to the resistive one when the current overcomes the critical current. Recent developments have shown the feasibility of the inducti ve fault current limiters using HTS in the form of hollow cylinders or stacked rings. In the present work the inductive fault current limite r consisting of a primary copper winding, a HTS cylinder or ring as th e secondary winding and an iron core is analysed. A mathematical model , taking into account the real current-voltage characteristics of HTS as well as the nonlinearity of B(H) (magnetic flux density as a functi on of field) curve of the iron core, is proposed and solved. Some typi cal results are presented and compared with experimental ones.