| Title |
A Study on Estimation of Insulation Resistance in Low-Voltage Direct Current Systems Using Open-Type Midpoint Grounding System |
| Authors |
오찬혁(Chan?Hyeok Oh) ; 전정채(Jeong-Chay Jeon) ; 이기연(Ki?Yeon Lee) ; 임승택(Seung?Taek Lim) |
| DOI |
https://doi.org/10.5370/KIEE.2024.73.11.2091 |
| Keywords |
Low-Voltage Direct Current; DC Grounding System; Insulation Resistance Estimation; Open-Type Midpoint Grounding System; Protection Device Interconnection |
| Abstract |
In low-voltage DC systems, the grounding system is mainly a two-wire or three-wire IT system. Among them, the IT high-resistance midpoint grounding system has advantages in detecting 1-wire ground fault, but has disadvantages in continuous loss and insulation resistance measurement. This paper proposes a method to estimate the insulation resistance of the + and - lines using the measured voltage when the switch of the high-resistance midpoint is closed/opened in the open-type midpoint grounding system. Through the proposed method, it prevents continuous losses due to high-resistance midpoint grounding and allows the insulation resistance to be estimated through switch control when the measured voltage exceeds a certain value. The proposed method was verified by simulation using MATALB/SIMULINK and experiment. |