A dc superconducting fault current limiter using die-pressed YBa₂Cu₃O₇ceramic

Abstract

A model of a superconducting fault current limiter on a polycrystalline high-temperature superconductor basis is checked in the dc short circuit regime. Protection of load takes place under the conditions described in this paper. The use of ceramic materials with superconducting-normal metal-superconducting Josephson junction network having an S-type current-voltage characteristic (CVC) is shown to be effective for fault current limiter devices.

Highly Porous Superconductors: Synthesis, Research, and Prospects

“…This prevents the growth of hot spots arising from the flow of currents close to critical. An efficient heat removal makes PSs attractive for use as short-circuit current limiters [137,138].…”

Switch-on and switch-off tests of inductive high-Tc superconductor based fault current limiter in the short circuit regime

“…Recently, the joint Greek-Russian group proposed a concept of switchgear based on a combination of AC superconducting FCL and silver-free electrical contacts [5][6][7]. In this concept, the main role of the superconducting FCL is to relieve the short circuit regime for the breaker.…”

“…For such a combined system, mass and weight decrease of the switchgear can be achieved, while due to the reduced working regime of the switchgear, less expensive contact materials, e.g. silver-free composites consisting of copper with small addition of sintered ultradispersed diamond, can be used [5][6][7]. These composites exhibit low and stable contact resistance, high switching wear resistance and mechanical strength, contributing to the reliable operation of switchgear.…”