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TN-C-S 접지계통에서 외부 루프 임피던스의 실측 및 기준값 설정에 관한 연구
이건호(Geon-Ho Yi),정진수(Jin-Soo Jung),문현옥(Hyun-Wook Moon),김선구(Sun-Gu Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.8
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 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.