Answer / abdurrahim

For transmission we are step up the voltage, Not only
reducing the copper loss but there are many factor to step
up the voltage
1) Transmission line conductor is calculated behalf of
current capacity.To transmit high current we have to
provide big diameter lines.Which is costly, Tower cost
increase.
2) current less means conductor diameter size will
less.Conductor cost will be less.
3) Obiviously the copper loss is dependent upon current,
Current less, It will help to reduce the copper loss.

So main factor to step up voltage is, to reduce cost of
material.To make the rigid the system.Easy for maintenance.

Answer / kaarthik

In this case ,we should not consider ohm's law... Generally
we step up voltage at the time of transmission right?? we
do this because it makes us to transmit power at high
voltage and low currents...and more over transmission
losses are calculated as copper losses=(I*I)R losses ..so
at low currents low transmission losses...Hope U
understand..

Answer / naveen

when we step up the voltage ,then current flowing in that
circuit will reduce. losses are directly proportional to
current.
cu. loss= i*i*r
so if we step up the voltage, then we can reduce the losses

Answer / rabindra

p=vi,since p is constant and if we increase "v" then "i"
will decrease i.e. loss will decrease.

Answer / shekhar

Rabindra for power loss we never use p=vi formula and the
logic u have given doesn't make any sense
power loss=i^2*r
that is why we step up voltage to reduce current.
While transmission we take care of current and in
distribution to consumer voltage is taken care of

Answer / pranav pathak

For transmission we are step up the voltage, Not only
reducing the losses but there are many reason to step
up the voltage
1) Transmission line conductor is calculated behalf of
current capacity.To transmit high current we have to
provide big diameter cable/line, and big diameter line
cable weight is more.Which is costly, Tower cost
increase.
2) current less means conductor diameter size will
less.Conductor cost will be less.
3) Obiviously the copper loss is dependent upon current,
Current less, It will help to reduce the copper loss.

So main reason to step up voltage is, to reduce cost of
material.To make the rigid the system.Easy for maintenance.

Exm.:- In generation station first we generate 11 kv, and
after generation we provide stape up transformer.

Answer / anon

Power is generated at the power stations, so after generating a given amount of power it's value is fixed and so
P = V*I is a constant.
Now if we Step-Up the voltage to say 10V (10 times), Now Power is fixed so Current Decreases 10 folds 0.1I
Now Line-Loss is I*I*R where R is the resistance of the Transmission Wire used. Since I decreases 10 times, I*I decreases 100 times.
So overall Transmission Losses decreases by 100 times if the Voltage wasn't Stepped-Up

Also thinner cable lines can be used to transmit the power since current value decreases also economical.

Answer / pavan kumar.m

In the transmission line we have more losses due to the flowing of current bcz when the current is flowing from conductor it faces the skin effect ..so due to that reason we have to decrees flow of current in T/L.... for that we need
to increase voltage....
AND...
In other words...
cu loss=i*i*r..
so due to above equation losses are directly prop to square of
current so if flow of current will decrease than losses will
decrease

Answer / vishal kumar sharma.

In a Transmission line we used Step-up voltage for transmit
the power, there are so many reasons for use of high
voltage, some is as follow:-
1) The resistance loss is I*I*R. By the formula if current
is low them resistance loss will low and line efficiency
will increase.
2) For a low current value, we should use a conductor with a
low cross section area for same power, as such cost of the
conductor & weight of conductor will also reduce.
3) As the weight of conductor will reduce, the weight of
Tower structures for carrying the low weight conductor will
also reduce and the cost of tower / project will reduce. As
such the capital cost of line also reduce.
4) As the tower weight is reduce, the foundation volume for
tower is also reduce. As such the capital cost of line is
reduce.

On the consideration of the above losses and the reduction
of capital cost of project. We will use a high voltage
system to transmit the power.


Regards.
Vishal kr. Sharma.
(Simplex Infra. ltd.)

Answer / abdul

Voltage is proportional to Current as we consider Ohms Low.But in the case of Transformer how the current reduce while stepping up voltage.all right it is for reducing loss and make transmission is cost effective..

But why the current is reducing and which formula or theory can explain the exact reason about this question.?

let me know from anyone??

in a distribution board,if we have a load and we have selected a cable after making all calcs (Deratings and V.D , ect...) the cable we have selected was 10mm.sq. now, shall the internal cable inside the switchboard should be 10 mm.sq Like the external or it can be Less???? if somebody have an specs or information he can help D:

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