This document stipulates the ratings, design and structure, type test, factory test, special test, handover test, etc. of high-voltage DC high-speed parallel switches. This document is applicable to high-voltage DC high-speed parallel switches in high-voltage multi-terminal DC transmission systems installed indoors or outdoors with operating voltage levels of ±800kV and below. This document also applies to the operating mechanism and auxiliary equipment of high-voltage DC high-speed parallel switches.