Answer / rachuri_sree

You need to know the distace between source of supply and
the load. consider a voltagedrop of 5%. i.e. 5V for a 440v
system. use the formula V=IR from this you will know the
resistance required for your requirement. (I is the load
that you want to connect). Use R=Pl/a to find the correct
cross section of the cable. (P is resistivity of either
copper or Aluminium, l is the distance).

We have one 500KVA transformer. We have tested REF relay and commissioned. After one and half year, due to some ground fault in one of the DB circuit Transformer tripped by REF relay. What will be cause and remedy. Please advise?

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