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小电流接地选线装置的原理是什么？有没有网友晓得？

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小电流接地选线装置的原理是什么？有没有网友晓得？

浏览：32次 | 提问时间： 07-16 08:36
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我是近视眼爱上你别当真糖给你跟我玩 07-16 08:37

电流接地选线装置，是一种电力行业使用的保护设备。该设备适用于3KV－66KV中性点不接地或中性点经电阻、消弧线圈接地系统的单相接地选线，用于电力系统的变电站、发电厂、水电站及化工、采油、冶金、煤炭、铁路等大型厂矿企业的供电系统，能够指示出发生单相接地故障的线路。

在见 07-16 08:45

接地选线装置一般用零序电压和零序电流作为接地故障线路判定依据。在高压室高压柜有母线测量PT,开口三角测零序电压;在每路出线柜装零序电流CT,线路有接地时,零序电流CT有电流流过。

半世繁华ャ琉璃 07-16 08:53

防雷接地包括的部分有：为把雷电流迅速导入大地以防止雷害为目的的接地称为防雷接地。防雷接地装置包括以下部分：
(1)雷电接收装置。直接或间接接收雷电的金属杆，如避雷针、避雷带（网）、架空地线及避雷器等。
(2)接地线（引下线）。雷电接收装置与接地装置连接用的金属导体。
(3)接地装置（即接地线和接地体的总和）。

放肆拥抱 07-16 09:02

那你需要先了解学习一下小电流接地选线装置的工作原理。一般来说，此类装置的原理是取各个出线的零序电流后，进行比较，从而判断哪条线路接地（接地线路的零序电流大、且与非接地线路零序电流方向相反）。零序电流是从CT二次侧取的，所以和CT参数有关。

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