A 15 KV, 1500 rpm cylindrical rotor synchronous generator is synchronized to a 13.5 kV (line for line) grid and the excitation voltage is set to 13.8 kV (line to line)

Under this condition the generator supplies 2.2 MW of real power and 0.6 MVAr of lagging reactive power to the grid

(a) Calculate the line current magnitude

(b) The torque angle for the above operating condition is found to be 8.15 ⁰ Calculate the value of synchronous reactance

(c) Calculate the magnitude of the line current.

(d) Calculate the new applied terminal voltage (line to line), if the speed is reduced by 15% for the same torque production while keeping a constant Volts/Hz ratio.

Answer rating: 100% (QA)

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