Question #154757

A single-phase overhead transmission line delivers 4000 kW at 11 kV at 0·8 p.f. lagging. If resistance and reactance per conductor are 0·15 Ω and 0·02 Ω respectively, calculate

: (i) percentage regulation

(ii) sending end power factor

(iii) line losses

Expert's answer

Is = Ir = 454.56(L-36.86)

i)- percentage regulation = "\\frac{(Vs-Vr)}{Vr}\\times 100"

="\\frac{(11120- 110000)}{110000}\\times 100"

= 1.09%

ii) "cos\\phi= Cos(36.86- 0.3465)"

= 0.80log

iii) line losses = "I^2Rl"

= "(454.54)^2(.30)"

losses = 61982W

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