Answer / makpsingh

Any transformer should have atleat four earthings.
2 connections for its neutral earthing and
2 connections for its body earhtings
All the connections should be with dedicated earth pits
which may be interconnected for relaiblity and to have
lower earth reistance value.
These earth pits should be duly marked and to be tested on
a dry day once in year of earth reisistance and earth
continuity. Earth Resistance value should be less than 5
ohms and if it is greater then these earth pits should be
treated to bring dowun the value.

Answer / vijay sagar reddy

Any electrical parameters have 2 Earthins

: 2 Neutral Earthing

: 2 Body Earthing

Answer / vijay sagar reddy

Any electrical parameters have 4 Earthins

: 2 Neutral Earthing

: 2 Body Earthing

Answer / gaurav sinha

Any transformer should have atleat four earthings.
2 neutral earthing and
2 body earhtings

Answer / manikandan

Thats depends upon the vector group of the transformer.in
case star-star,the neutral earthing is require 4Nos
(Primary/Secondary)earthing and transformer body is
required 2Nos earthing.Types of earting is more than 2.That
is depends upon the standard practice.

Types
1.Direct earthing(In India)
2.Inductance earthing(In practice in UN)
3.Using resonant coil

Answer / kishore

along with above said earthing thransformer bushing is also
earthed which is mandatory

Answer / hero

along with above said earthing thransformer plate earthing
is required

Answer / pranay

4 earthing is required

Answer / ravi nalli

Whether neutral (from neutral bushing) is connected tank
body is correct

Answer / manikandan

Now days in normal practice we are using 100mm Dia cast
iron pipe length of 2.5Mtr.It is good conductivity compare
the pipe and plate earthing.

what happens when we give supply to the secondary of a transformer ?? for example 415v(pri)/110v(sec)

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