剩余电流动作保护装置的运用

Application of Residual Current Device

通过对GB 13955-2005《剩余电流动作保护装置安装与运行》与GB 50054-2011《低压配电设计规范》的条文对比,针对TN、TT、IT等低压配电系统的接地型式,结合工程实际情况,分析了剩余电流动作保护装置(Residual Current Devices,RCD)在低压配电保护中的工作原理,提出了剩余电流动作保护装置运用范围,总结了剩余电流动作保护装置用于线路保护的局限性和选型注意事项。剩余电流动作保护装置降低了人身接触电击事故,利于监督线路绝缘水平和预防电气火灾,同时对加强低压配电的管理和提高用电的安全性具有十分重要的意义。

Compared are clauses in GB 13955-2005 'Installation and Operation of Residual Current Device' with those in GB 50054-2011 'Code for Design of Low Voltage Electrical Installations'. According to the grounding types of TN, TT, IT and other low voltage distribution systems, combined with practical engineering design, analyzed is the work principle of Residual Current Device(referred to as RCD) in low voltage power distribution protection, proposed is application scope of the residual current device, summarized is the limitation of the residual current device used for line protection and listed are considerations during type selection in combination with design experience and the relative standards, which is beneficial to reduce personal contact electric shock accidents, supervise line insulation level and prevent electrical fires, also can provide technological guidance for installation, operation and maintenance of the residual current device and has very important significance for strengthening low voltage power distribution management, popularizing safety knowledge of electricity and improving the reliability and security of power supply.