Analysis of the effect of a saturable-core HTS fault current limiter on the circuit breaker transient recovery voltage

This paper presents the analysis of transient recovery voltage (TRV) under the presence of a saturable-core high temperature superconducting fault current limiter (HTS FCL). Calculations are performed for the case when an equivalent air core reactor that provides comparable fault current limitation as the FCL is inserted in the line. Simulations are performed using different approaches that comprise the direct solution of the related equations solved in a spreadsheet. This is compared with results obtained using EMTP-RV^® and PSCAD^® software simulation tools. The obtained results concur to show that the saturable-core HTS FCL has a significantly lower effect on the rate of rise of the circuit breaker TRV as compared with the air core reactor.