Line tripping on transformer inrush
Line tripping on transformer inrush
(OP)
Is there anyway to get around a line with 9 or so transformers from tripping out on inrush? I know that you have to hit it just right for it happen so it is kind of a rare bird. Do some people use harmonic restraint, time overcurrent curves, or just a delay to give the inrush a chance to decay some before making a decision as to whether to trip out or not? The inrush is tripping out phase distance protection.






RE: Line tripping on transformer inrush
RE: Line tripping on transformer inrush
RE: Line tripping on transformer inrush
RE: Line tripping on transformer inrush
Do you have a magnitude/time estimate for the transient during reclose? What does the TCC for the relay look like and how adjustable is it?
RE: Line tripping on transformer inrush
That being said, is it the inrush itself causing the maloperation ? Did you check if the CT goes onto saturation ( due to long DC decay) ?
Can this be the root cause ?