| Title |
Protective Insulation Monitoring Device in IT Earth Systems |
| Authors |
Yong-Jung Kim ; Hyosung Kim |
| DOI |
10.6113/TKPE/2015.20.3.209 |
| Keywords |
IT system; DC distribution system; IMD; Insulation resistance |
| Abstract |
With the increasing popularity of renewable generation systems and the advancement of power electronics, DC distribution systems have recently received considerable research attention. DC distribution has numerous advantages, including reliability, power quality, and efficiency. Owing to these advantages, DC distribution has been applied to data centers and power quality-sensitive electronic load conditions. Because grounding electrodes in DC are much more susceptible to corrosion than in AC, the IT system defined in IEC Standard 60364 may be a good candidate for an earthing method for DC distribution systems. In addition, IEC Standard 61557 specifies the requirements for insulation monitoring devices (IMD) for protection of the IT system, which continuously monitors the insulation resistances between the power lines and the earth. This paper discusses the development and evaluation of IMD to promote the reliability of distribution systems and increase safety of humans and facilities. |