Answer / parth belani

Since the neutral of the star connected secondary is
already grounded through NER, there is no need to run a
neutral cable.

Answer / viki

what is NER?

Answer / ramesh

there is no need of taking neutral point unless u need.Because mostly in 33kv Switch board you will feed 33/11Kv or 33/6.6Kv Transformers ,which will be mostly in (Dyn11 ior Dyn1) or to any other 33KV boards. Any how you are not going to take any motors load directly in 33kv.so it s not neccessary. but if you feed any star connection load in Primary you need to take neutral point.

Answer / pichumani

It is not necessary to run a neutral cable as the same is
not requried for a 33 kV 3 wire AC system. But you need to
be cautious about the circulating/eddy current (since in
is a single core cable) which flows through the screen of
the 33kV cable. The voltage genrated by the circulating
current should be more than 130 V as per IEC standards. In
case of heavy circulating current the cable would get
heated up. You may do earthing of the cable only at one end
and leave it open at the other end. In case of a very long
cable with joints in between, mid point bonding is
suggested.

Answer / indreswararo kota

for a 132/33kv transformer secondary is star and is
connected to NER. and from secondary a cable is running to
33kv swbd. since the cable is single core do i have to run
neutral cable also to 33kv swbd.???

Why we do 2 types of earthing on transformer (ie:)body earthing & neutral earthing , what is function. I am going to install a oo kva transformer & 380 kva dg set what should the earthing value?

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