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Do given above with the replacment of earilier transformer by 40000-220 V step down transformer. Neglect as before, leakage losses. Hence explain why high voltage transmission is preferred. |
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Answer» Solution :Here, `E_(v) = 40000` volt. Since `P = E_(v) I_(v) :. I_(v) = (P)/(E_(v)) = (800 xx 10^(3))/(40000) = 20 AMP` Line power loss `= I_(v)^(2) = (20)^(2) xx 15 = 6000 W = 6 kW`. plant supply `= 800 + 6 = 806 kW` Voltage drop on the line `= I_(v) R = 20 xx 15 = 300` volt. `:.` Voltage for transmission ` =40000 + 300 = 40300` volt. `:.` STEP up TRANSFORMER needed at the plant is `= 440 V - 40300 V` Power loss at higher voltage `= (6)/(800) xx 100 = 0.74 %` Power loss at lower voltage`= (600)/(1400) xx 100 = 42.8%` Hence high voltage transmission is preferred. |
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