SSE JE Electrical Engineering 29 Oct 2020 Shift 2 Papers

Question : 119 of 200

Marks: +1, -0

Let R be the resistance of each conductor in a DC 2-wire with midpoint earthed transmission system. What is the copper loss in the system to transmit the power P?

${ \P ^{2}}/{2 \V ^{2}} \R$
$2({ \P }/{ \V })^{2} \R$
${ \P ^{2}}/{ \V ^{2}} \R$
$4({ \P }/{ \V })^{2} \R$

Validate

Solution:

Direct Current 2-wire System with Mid-point Earthed:
The DC 2-wire system with mid-point earthed is called DC 2-wire balance system.
Such a system is shown below.

In which, line voltage = 2V
Line current,

\I=\P/{2\V}

If R be the resistance per conductor than the total loss for both conductor is:

\P_{\L}=2 \I^{2} \R=2({\P}/{2 \V})^{2} \R

={\P^{2}}/{2 \V^{2}} \R

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