hi folk,
why do we need the pickup current setting like 0,2 pu at power transformer ?
that is 20% of nominal current.
and we can't understand polarity is true or invert to 20% power of transformer.
example CT ratio 1000/5 A
I pickup = 0,2 pu ---> 200 Amper
if load current less 200 Amper so then we can't see CT's polarity true or false at new installing differential relay.
why need to pickup ? or can't it set smaller than 0,2 pu ?
best regards.
Differential pickup current setting 
Re: Differential pickup current setting
