对于后备保护装置防止高阻抗接地故障，将配置一只双极方向过电流继电器，同瞬时跳闸附件的时间成反比。

For backup protection against high resistive ground faults, there will be a dual polarized directional overcurrent relay, inverse time with instantaneous trip attachment.

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本发明涉及双室卡普耳，其包括包含旁路（3）、中间塞子（6）和末端塞子 （10）的圆筒（1），以及附件；

The invention relates to a dual-chamber carpule comprising a cylinder (1) comprising a bypass (3), a central plug (6) and an end plug (10), and an attachment;

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双圈防护网结构： 用冷拔碳钢丝焊接成网筒状卷边与网面一体，用连接附件与钢管支柱固定。

Structure: the edges are cylingder rooled with colddrawn lowcarbon steel wire, forming a whole with the mesh sheet.

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