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Performance of transmission lines 1

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Question 20 -0.519886 radians  How come= tan–¹ = (0.0291566) = 1.6704 Use maclaurin series formula ( in radians)  Question 19 A (medium) single phase transmission line 100 km long has the following constant , resistance per kilometer 0.25 ohm , reactance per kilometer 0.8 ohm , susceptance per kilometre 14×10–⁶ siemens, receiving end line voltage  66 kv ,  Asuming that the load capacitance of the line is localised at the receiving end alone .  determine (1) the sending end current (2)  the sending end voltage (3)  regulation  {4) supply power factor .  the line is delivering 15000 kilowatt at 0.8 power factor lagging . Draw the phasor diagram to illustrate your calculations  . ...