Design of Mid-Point Ground with Resistors and Capacitors in Mono-Polar LVDC System

Seung-Taek Lim (), Ki-Yeon Lee, Dong-Ju Chae and Sung-Hun Lim ()
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Seung-Taek Lim: Electrical Safety Research Institute, Korea Electrical Safety Corporation, 111 Anjeon-ro, Iseo-Myeon, Wanju-gun 55365, Republic of Korea
Ki-Yeon Lee: Electrical Safety Research Institute, Korea Electrical Safety Corporation, 111 Anjeon-ro, Iseo-Myeon, Wanju-gun 55365, Republic of Korea
Dong-Ju Chae: Electrical Safety Research Institute, Korea Electrical Safety Corporation, 111 Anjeon-ro, Iseo-Myeon, Wanju-gun 55365, Republic of Korea
Sung-Hun Lim: Department of Electrical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea

Energies, 2022, vol. 15, issue 22, 1-20

Abstract: Low-voltage direct current (LVDC) systems have been increasingly studied as new efficient power systems. However, existing studies have primarily focused on power conversion designs, control, and operation, and research on ground configurations of LVDC systemsis insufficient. Consideration of the installation criteria of protective equipment and grounding systems is crucial because ground configurations in general households for end users are highly associated with the risk of human electrocution. Therefore, we investigate a mid-point grounding system using capacitors to ensure electrical safety in a mono-polar LVDC system that a general end user can directly experience in a household. MATLAB/Simulink is used to analyze the fault characteristics of the mid-point grounding system using capacitors by considering the effects of DC on the human body based on the International Electrical Code (IEC). Consequently, this paper suggests the minimum required values of the capacitors and resistors to operate the DC residual current detector (DC RCD), and the operation of the DC RCD was confirmed. By confirming the applicability of DC RCD in a household LVDC system with a mid-point grounding system using capacitors and resistors, unnecessary power loss in a mid-point grounding system and electrical accidents, such as electric shocks and fires, could be minimized.

Keywords: low-voltage DC (LVDC); human electric shock; mid-point grounding; DC residual current detector (DC RCD); capacitor discharge; heart-current factor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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