Ungrounded System-Advantage, Drawbacks and Fault finding

#types of grounding
#ungrounded system
#fault current path
#insulation monitoring device

[@efraimmasarrang]

Hi sir, can you explain why the voltage in the healthy phases increase?

[@rajababu.n6265]

It could be of many reasons, loading and unloading effects, switching surges, type of loads and ambient conditions like lightening etc.