A Study on the Measurement and Determination of External Loop Impedance on TN-C-S System
TN-C-S 접지계통에서 외부 루프 임피던스의 실측 및 기준값 설정에 관한 연구

Geon-Ho Yi, Jin-Soo Jung, Hyun-Wook Moon, Sun-Gu Kim
2013 The Transactions of The Korean Institute of Electrical Engineers  
The maximum allowable value of loop impedance(Zs) to secure the operation of overcurrent protective devices and the safety for indirect contact is a very important in TN-C-S system. The loop impedance is divided into inner loop impedance which consumer can adjust and external loop impedance(Ze) which only electric operator can adjust. Thus, an external loop impedance which limits to less than a certain value is a very important factor for human body protection against electric shock in TN-C-S
more » ... c shock in TN-C-S system. The concept of loop impedance(Zs) is recently introduced to the domestic, the study about external loop impedance is yet insufficient. However, the study about the reference impedance as specified by the IEC 60725 standard to improve the quality and reliability of the power supply is being made. In this paper, reference value of external loop impedance(Ze) to meet domestic environment will be proposed by the nationwide measurement and statistical analysis.
doi:10.5370/kiee.2013.62.8.1163 fatcat:4yrz7cbstjep5jiurslktwo4du