| 接地故障保护的设置和整定(三) |
| |
| 引用本文： | 李华英,李兴林.接地故障保护的设置和整定(三)[J].建筑电气,2002,21(2):4-9. |
| |
| 作者姓名： | 李华英 李兴林 |
| |
| 作者单位： | 中国建筑东北设计研究院,110006 |
| |
| 摘 要： | 7 TT系统接地故障保护 TT系统的电源中性点直接接地,而电气设备的外露可导电部分则经各自的PE线接地。这样在大多数情况下,由于故障回路包括两个接地电阻,使接地故障电流太小,不足以使过电流保护动作切断接地故障电流。而且由于故障电流小,故障点未被熔焊,故障点阻抗是难以估计的接触电阻。因此,TT系统接地故障回路阻抗和故障电流难以估算。所以,必须设置漏电电流动作保护。
|
| 关 键 词： | 接地故障保护 配电线路 接地装置 IT系统 电气设备 |
Setting and Arrangement of Earthing-breakdown Protection(Part three) |
| |
| Setting and Arrangement of Earthing-breakdown ProtectionLi Huaying.Setting and Arrangement of Earthing-breakdown Protection(Part three)[J].Building Electricity,2002,21(2):4-9. |
| |
| Authors: | Setting and Arrangement of Earthing-breakdown ProtectionLi Huaying |
| |
| Abstract: | Based on the body resistance, physiological reaction while current passed through body, permitted maxium current-action time under variable contacing voltage,the paper presents the following technique issues:earthing-breakdown current and body contacting voltage, eastimation of normal leakage current, earthing-breakdown protection of TN, TT, IT system, earthing-breakdown protection of pre-guard fire,earthing-breakdown protection of far-end line, main e-quivalent potential bonding and auxiliary equivalent potential bonding. |
| |
| Keywords: | Low-voltage distribution system Earthing-breakdown protection Contacting voltage Over-current protection Leaking current protection Selectivity |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
