Q4) A Y-connected synchronous motor whose nameplate is shown in Figure Q4 has a per-unit synchronous reactance of 0.9? and a per-unit resistance of 0.02?. GENERAL ELECTRIC SYNCHRONOUS MOTOR RATED HP 21,000 RPM 1200 PF 1.0 VOLTS 6600 PHASE 3 FREQ 60 CODE B AMP 1404 FRAME 9398 TYPE TS EXCITATION-VOLTS 125 AMP 5.2 HP 21,000 CONT. 80 °C RISE STATOR RTD 105 °C RISE ROTOR BY RESISTANCE OUTLINE-816E357 CAUTION BEFORE INSTALLING INSTRUCTIONS GEK-42586 OR OPERATING READ CONN. DIAG. 34A150850 WHEN ORDERING RENEWAL PARTS, GIVE THIS MOTOR MODEL & SERIAL NO. MODEL 264×766 SER. NO. 8374051 NP 34A770169-001 SCHENECTADY N.Y. MADE IN U.S.A. Figure Q4 a) Calculate the rated input power of this motor. (4 marks) b) Calculate the magnitude of the armature voltage EA at rated conditions. (4 marks) c) Calculate the maximum reactive power that can be simultaneously supplied by the motor if the input power of this motor is 10 MW. (8 marks) d) Calculate the power consumed by the field circuit at the rated conditions. (2 marks) e) Calculate the efficiency of this motor at full-load conditions. (2 marks)
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However, in this case, the power factor is 1.0 (unity), so the formula simplifies to Power = Voltage x Current x √3. Substituting the given values, we get Power = 6600V x 1404A x √3 = 16.05 MW. Show more…
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