What are methods to avoid the inrush current at the time of
starting of power transformer ?
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Answer Posted / priyan
You can reduce the second harmonic by using the DELTA
connection in the CT’s but I prefer to play with the
protection relay parameters, in this case it is better to
control the differential current, there is 2 slopes for the
differential zones, try to increase the slope N01 to get
passing the inrush current.
By filtering the 2 nd harmonics, refer to relay co
ordination and set the values
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