Answer / bhushan bhamare

as a engg.you working for trubleshutting for ladder,any
mistake in control pannel to proper way,so whenver you have
relax time you read the control pannel drawing,ladder for
PLC,and you have make the carrier in electrical drawing so
you work as a maintance engg because its benifited for you
and get more knoeledge.

Answer / ramesh

Yes, it hopeful that carrier in electrical maintenance
secondly you wants for drawing carrier in electrical drawing
so you have mostly consider about
Engineering drawing with this application study certain
opportunity for company

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

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