In the power distribution company where I work, the earth fault relays are usually set to 20% of the nominal feeder current. I have also seen online sources that specify between 10% and 20% for earth fault settings.
I am aware that even in an unbalanced load situation, there is a very negligible ground fault current. So I wonder why go as high as 10%? Why not 2% or even 1%?
I am aware that even in an unbalanced load situation, there is a very negligible ground fault current. So I wonder why go as high as 10%? Why not 2% or even 1%?