Operating Reliability of In-Grid HTS Power Cables Based on Electromagnetic–Thermal–Hydraulic Analysis

High-temperature superconducting (HTS) power cables with low loss and large capacity are playing an indispensable role in power transmission. However, the reliability analysis of in-grid HTS power cables is hindered by the scarcity of failure data from demonstration projects. This paper investigates the electromagnetic–thermal behavior of in-grid HTS power cables under two failure modes: short-circuit fault and cooling system failure. To improve the reliability of the HTS power cable, this paper proposes a current-dependent overheating protection strategy and a reclosure strategy based on the maximum self-recovery temperature. The optimized strategies increase the operating probability of the normal state for the HTS power cable from 99.27% to 99.49%, demonstrating that HTS power cables can achieve high reliability in grids.