欧洲色综合天天在线影院,亚洲AV无码AV日韩AV片,精产国品一二三区别9978,欧美成人精品高清在线下载,一本久久a久久免费精品顶级

Used in large, medium and small power plants and substations to provide dc power supply for switching, relay protection, automatic control, accident lighting, etc. The reliability of dc screen is irreplaceable by other power supply devices. It can meet the high reliability requirements of power supply in substation and power plant.
This product conforms to: GB hall 19826-2005 general technical conditions and safety requirements for dc power supply equipment in power engineering; General technical conditions and safety requirements for dc power supply equipment in power system JB/ t8456-1996 low-voltage dc switchgear set; DL/ t459-2000 technical conditions for ordering dc power supply cabinet of power system; DL/T 5041-95 technical specification for design of communication in thermal power plant.