Recently, the adoption of new and renewable energy sources such as solar and wind power has increased, and the importance of direct current-based systems to increase energy efficiency is increasing. Accordingly, various studies related to Low Voltage Direct Current(LVDC) distribution are in progress, the industry related to low voltage direct current distribution is developing, and related systems are also in progress. As the industry increases, safety issues such as load protection and electric shock to humans are continuously being raised when implementing low voltage direct current distribution networks. To solve this problem, research on direct residual current detectors (RCDs) and residual current monitors (RCMs) is in progress, and product commercialization is also in progress. However, since RCDs and RCMs are monitoring devices, they cannot be shut off in situations where quick shutoff is required. has. Accordingly, it is necessary to develop a DC earth leakage circuit breaker that can cut off the electric circuit as quickly as possible when a DC leakage occurs. [1-3]. The studies related to direct current electric shock that have been studied so far include research on the effects of electric shock on the human body in direct current in IEC 60479 and research on direct current leakage protection devices in IEC TS 63053 [4, 5]. IEC, an international standards organization, has formed a working group and is conducting research and standardization. However, in implementing actual direct current distribution, research on human electric shock protection within customers is not active and research is still insufficient [6]. Copyright © The Korean Institute of Electrical Engineers.
