This part of GB/T 22390 specifies technical requirements,test methods,test rules, packaging, transport, storage, markings, labels, user’s manual, completeness of supply, as well as quality assurance of the AC and DC station control equipment of ±500 kV HVDC transmission system. This part is applicable to the AC and DC station control equipment (hereinafter referred to as the equipment) of ±500 kV HVDC transmission system.