The previous TKD-A system was upgraded with S7-300 +6RA70+ vacuum contactor structure.The paper introduced the design of the system hardware and software.

• 通过采用“S7-300+6RA70+真空换向柜”结构对原TKD-A系统进行了改造,文章对系统硬件、软件设计作了说明。