Study of the three-phase saturated transformer coupling new bridge-type SSFCL

Abstract

SUMMARY In this paper, the principles of the three‐phase saturated transformer coupling new‐type solid state fault current limiter (SSFCL) are studied using the equivalent circuit method; in addition, considering the nonlinearity of the iron core material in the saturated transformer, the circuit field‐coupled 3‐D finite‐element analysis is employed to investigate the transient performance of the proposed SSFCL. The analysis and simulation results show that the novel SSFCL has negligible impact on the power system during the normal operating stage, automatic response to the short‐circuit fault, and especially low secondary voltage level during the current‐limiting stage, which are of great significance to the reduction of the thyristor voltage level, the DC reactance, as well as the volume and cost of the whole SSFCL. The current‐limiting effect is also tested in the simulation of a multi‐machine power system with the protection of SSFCL. Last, the comparison of the simulation and experimental results proves the feasibility of the proposed SSFCL. Copyright © 2012 John Wiley & Sons, Ltd.

Analysis of a Switched Impedance Transformer-Type Nonsuperconducting Fault Current Limiter

“…In general, there are two methods to help reduce the size of the transformer. First, it is possible to create dc reactance to operate in magnetic saturation [14] when the fault occurs. Alternatively, it is possible to switch in additional resistances when the fault occurs so that the power resistor will limit the fault.…”

Investigation of the performance of distance relay in the presence of saturated iron core SFCL and diode bridge type SFCL

“…In terms of comparison, the cost of development of NSFCLs is lower, and they are more interesting which conduct the research mainly towards this type, since the superconducting element which consists the major part of SFCLs is currently expensive and needs the cryogenic cooling system. However, some types of SFCLs including resistive type SFCL (RSFCL), hybrid SFCL (HSFCL), saturated iron core SFCL (SISFCL), and bridge type SFCL (BSFCL) have significantly progressed . In particular, this paper focuses on the two topologies including SISFCL and BSFCL.…”

Impact of fault resistance and fault distance on fault current reduction ratio of hybrid SFCL

“…The development of such a power device with this working principle has become an interesting field within the academic and industrial communities. In particular, various structures based on superconductors, semiconductors, and liquid metals have been developed. Compared with the other technologies, superconducting FCLs (SFCLs) are considered the fascinating technology.…”