Measurement of Grounding Fault Loop Impedance and Discussion on Related Issues

ZHOU Weixin（Beijing Shuangyuan Engineering Consultation & Supervision Co.，Ltd.，Beijing 100080，China）

 

    Abstract：To check the operability of grounding fault loop impedance test，the grounding fault loop impedance of some projects is actually measured by revision team of Code for Acceptance of Construction Quality of Electrical Installation in Building（GB 50303）. The scope of grounding fault loop impedance is analyzed；protection against electric shock is clearly stated as the requirement on the grounding fault loop impedance. Test methods and measured data of the grounding fault loop impedance，as well as measures which shall be taken when the measured value of the grounding fault loop impedance does not meet the requirement, are introduced.

    Key words：grounding fault loop impedance；impedance voltage drop method; current clamp method；protection against indirect contact；automatic power-off；protection against electric shock；instantaneous acting current；equipotential bonding

 

    摘 要：为检验接地故障回路阻抗测试的可操作性，GB 50303《建筑电气工程施工质量验收规范》修订组对一些项目的接地故障回路阻抗进行了实测。分析接地故障回路阻抗包括哪些部分，明确对接地故障回路阻抗的要求是防电击措施；介绍接地故障回路阻抗的测试方法、实测数据，以及接地故障回路阻抗实测值不满足要求时应采取的措施。

    关键词：接地故障回路阻抗；阻抗压降法；电流钳法；间接接触防护；自动切断电源；电击防护；瞬动电流；等电位联结

     中图分类号：TU852 文献标识码：A