Answer / anayat

Open delta is usually three transformers connected in parallel in such a way that if any one of the transformers operates inefficiently the rest two will mantain the load ....or in short if one of the three transformers ooerating in parallel is disconnected the arrangmnt obtained is called an open delta connection....

This is about the recent problem that we have faced in our project site. We have 6/7.5 MVA. 66/11kV three phase star - star power transformer. The neutral was solidly connected to the earthing mat. But because of high resistance of earthing mat (130 ohm on LV and 180 ohm on HV), one day LV side neutral earthing conductor melted and we had a huge damage. Can any one plz tell me what might happen when we connect power transformer neutral to the earthing mat which has high resistance (>100 ohm ) ?????

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