Superconducting Fault Current Limiter Application for Reduction of the Transformer Inrush Current: A Decision Scheme of the Optimal Insertion Resistance

Abstract

A conventional superconducting fault current limiter (SFCL) is usually only connected to a power system for fault current limitation. The study described in this paper, however, attempts to use the hybrid SFCL application to reduce the transformer inrush current. To accomplish this, this paper first suggests the concepts to expand the scope of the SFCL application in the power system. The power system operator should first determine the proper amount of current-limiting resistance (CLR) of the hybrid SFCL. Therefore, this paper suggests a decision scheme of the optimal insertion resistance in an SFCL application to reduce the transformer inrush current. This scheme and the SFCL model are implemented using the electromagnetic transient program (EMTP). We determine the optimal CLR by EMTP simulation, and this value is applied to model the SFCL by the EMTP. The simulation results show the validity and effectiveness of the suggested scheme and the ability of the SFCL to reduce the inrush current.Index Terms-Electromagnetic transient program (EMTP), optimal insertion resistance, superconducting fault current limiter (SFCL), transformer inrush current.

A New Strategy for Selection of Switching Instant to Reduce Transformer Inrush Current in a Single-phase Grid-connected Photovoltaic System

“…Several methods have been proposed to limit the inrush currents [4,[6][7][8][9][10][11][12][13]. In [4], the authors introduced a systematic switching study to minimize the inrush current without residual flux estimation.…”

“…In [10], the effects of residual flux were studied for the optimal closing instant to minimize inrush current. The authors in [11] used the conventional superconducting fault current limiter to reduce the inrush current. The inrush current was reduced by using a series compensator in [12].…”

Improvement of Power System Stability by Using New Switching Technique in Bridge-type Fault Current Limiter

“…SFCLs offer a solution to these problems with many significant advantages. Figure 1 shows favorable SFCL placements in a power system, and the technical and economic benefits are summarized in Table 1 [6][7][8][9].…”

Simple Switching Technique Reduces Inrush Current in Transformers Connected in Parallel

“…Earlier research on the reduction of inrush current in transformers [4][5][6][7][8][9][10] was confined to the switching of one transformer at a time. No importance was given to the reduction of inrush currents in a group of transformers when re-energized after a total power failure in a substation and no work is reported in this area.…”