Answer / ashish

Any DG Require Four earthing strip Two For Neutral Earthing
& Two For Body Earthing.
Incase of 250 KVA DG 30X6 mm GI Earthing Strip is Suitable.

Answer / ajaydoss

Thanks for reply. I need the calculation (formula) .

Answer / ramesh p n

Voltage is the potential difference between two Conductors,
for Single Phase and the fro three phase system it is the
potential Difference between three phases and the neutral
for Example in india WE have 240 Volts A C Voltage for
single phase and 415 V for 3 Phase,

Forula to determine Power, Voltage and Currents

1 Phase : P = V X I = { Power(in watts)= Voltage X Current}


3 Phase P = rootof3 X V X I cos Phi,


Power = 1.732 X Voltage X current X Power Fator

Answer / uma sanker dwivedi

THE RATED CURRENT OUTPUT WILLBE 434AMP AND THE EARTH
CONTINUITY CONDUCTOR SHOULD BE HALF OF THE LARGEST CURRENT
CARRYING CONDUCTOR.
IF THERE IS CU CONDUCTOR OF SIZE 400SQ. MM IS USED THEN
EARTH CONDUCTOR SHOULD BE 200 SQ. MM OF DIMENSION 40X6 CU
STRIP CAN WORK EFFECTIVELY.

Answer / anupam mahesh

Forula to determine Power, Voltage and Currents

1 Phase : P = V X I = { Power(in watts)= Voltage X Current}


3 Phase P = rootof3 X V X I cos Phi,


Power = 1.732 X Voltage X current X Power Fator

Answer / rsbangra

what is the voltage level ?
kva =1.732*v*i
i=kva/1.732*v

we get current value then find out current carring bus size

Answer / samson

Neutral will come in to picture whenever u start ur DG (
and not paralleing with a Grid as it will create a
circulating current), so worst thing that can happen is L.G
fault on a phase of generator or inside the winding , so
max current that can go is dg rating/ phase volatge ( use
formula above) so ur neutral should be capable of that
much curent ,( neglecting any contact resistance in ideal
case)

the switching of neutral is done through contactor.

use this to size strip
the I = K* A/ sqrt of time ( some of IS standered give u k
for bare conductor) Dg manufacturer will size support for
S.C forces

get k for alumi. or copper u can size to next standered
sizes available 20 x 6, 40 x5 n all

Answer / dg

Current should be 348Amp. As DG of 250KVA not 250Kw. So PF wont be used to calulate current.

I've descovered that when the earth wire in a domestic electrical installation is not connected back to the board (ground) a voltage of between 9-24v is is found to be present in the earth wire. When connected at the board there is no voltage - is this normal and why does it happen?

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