Comprehensive diagnostics of DC Interruption Process of Pure-Water Arc Discharge under High-Pressure Conditions

In recent years, the demand for DC power supply systems has increased with the widespread adoption of electric vehicles and renewable energy, leading to a growing need for low-cost, highly reliable DC protection devices. A power fuse is a widely accepted choice as a DC protection device; however, conventional arc-quenching media inside the fuse, such as silica sand, exhibit a significant reduction in current-limiting ability in the low-current region, resulting in degraded interruption reliability. In this study, pure water is employed as a new arc-quenching medium to maintain current-limiting performance in the low-current region. Its effectiveness is verified through DC 100 V interruption tests.