Question

The capacitance of a 3 core lead sheathed cable measured between any two of the conductors with sheath earthed is 0.19 $\mu$F per km. The kVAR required to keep 16 km of the cable charged when connected to 20 kV, 50 Hz supply is _____ kVAR.

• A. 763.6

Answer 1

The correct option is A 763.6

Since the capacitance measured is 3.04 $\mu$F between the conductors, the capacitance per phase will be

$2\times 3.04=6.08\mu F$

3-phase kVAR required = $V^2\omega C$

$={20}^2\times 314\times 6.08\times {10}^{-3}$
= 763.6 kVAR