Answer / vikramsenareddy

Ans: Transformer secondaty sholud have neutal point. This
we brought from earth. neutral point is earthed and
connected to T/F. for this we required one earh pit. and
for body earthing we should have another earh pit.
structure earthing for this another earth pit.

For an equipment we required only one earth pit for body
earthing and electrical accessories earthing( like
motors,switch gear, electronic instruments).

Answer / pk kar

There should be two distinct earth pit for TR neutral and
one for body earthing. This is as per IER. The earth
conductor crossection will depend upon the max fault
current that could flow in the system in case of a fault.
The thumb rule is, the crossecton of the earth conductor
should at least be half of one phase conductor.

Answer / farrukh

First of all we need to know ,Why we earth the transformer
neutral,? and the answer is that ,
Transformer has three out put phases and at any time all
these phases loads are not equal, so when the load is
unbalanced on any phase, the current may flow in neutral
line,and to dissolve the current at transformer end we need
to earth the neutral. Neutral pits are used to to provide
best conductive earth.

Answer / kartik

No of Earthing pits for a equipment depends upon components
of equipments prone to flow of fault current during
abnormal condition.Say for transformer, metal body &
neutral may carry fault current.So 2 nos pits for
transformer is required.

Answer / meka sekhar

normally, transformer body is conned to earth mat via earth
cables. No earth pit is required for body connection.
Normally Earth pit will be provided for neutral earthing
in order to facilitate isolation.

Answer / mrudang

earth pit is depnd upon

on vector group of transformer which we are used
equipment body earthing ,in delta connection we required
earthing transformer to protect from earthfault current

Answer / sathihsa

earth pits for tr depends on kva rating and fault current
use to carry.........

Answer / shvetang

the no of earth pits are depends upon the amount of earth
fault current that occurs during working of any equiment

Cables Construction hi friends, 0.6/1/1.2 kV LV , DC and Control cables are concentric copper conductor what does its means and what is the use of concentric copper conductor,and are this with copper tape shield or copper screening, ? thanks

0 Answers  

If ROC does not lies inside unit circle,then ? a) Fourier transform converges b) Z transform converges c) Hatly transform converges d) Colpit Transform converges.

0 Answers   CCP,

TYPES OF TEMPERING OF ENERGY METER

1 Answers  

dg earth connect only in the amf panel or not why

0 Answers  

What will happen if a dc source is given to a tubelight. Will it work or wont it work....

0 Answers  

whydoes the p.f of diesel generator always be 0.8 explain how will you determine the shortcircuit capacity of network

1 Answers   Dalkia,

how we can check new PT ? without name plate.

1 Answers   Indo Power Projects,

how can we detect that which is receiving side and which is sendind end of a trnasmmison line by just seiing it?i.e its which end is coming from genertaing and distribution side?

5 Answers  

1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve

0 Answers  

Why size of HT cable is less then LT cable inspite of the fact that voltage is higher in HT cable?

2 Answers   L&T,

What is Tan Delta Test

1 Answers   Power Grid,

A distribution transformer giving afrequency of 200HZ, where it is rated for 50HZ. when it will occure?

2 Answers