该装置在总馈电开关处的漏电保护装置使用附加直流电源原理，在分支馈电开关处的漏电保护装置使用零序功率方向式保护原理。

This device use the principle of additional DC power supply in main feeding switch, and use the principle of direction of zero sequence power in branch feeding switch.

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每一分支都有单独的微带一垂直探针馈电系统，并在分支上蚀刻有一个细槽以提高两个端口的隔离度。

Each of the crossed branches has an exclusive microstrip vertical via feed system. To further increase the isolation between the two ports, a slot is etched on each of the crossed branches.

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