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See Chinese contents: NB/T 42107-2017 NB/T 42107-2017: High-voltage direct current circuit-breaker
This standard applies to high-voltage DC circuit-breakers (hereinafter referred to as DC circuit-breakers) for DC 6 kV and above power systems. This standard is mainly for mechanical DC circuit-breakers. Power electronic and hybrid DC circuit-breakers can also refer to this standard. This standard specifies the operating environment conditions, terms and definitions, ratings, technical requirements, type tests, exit-factory tests, special tests, field tests, etc. of DC circuit-breakers. This standard also applies to the operating mechanism of DC circuit-breakers and their auxiliary equipment. Note: This standard covers lightning arresters, capacitors, reactors and other devices used in DC circuit-breakers.
