EXPERIMENT 5: 3 Phase Synchronous Machine Connected as a ...

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Exercise1. Construct the circuit as shown in the fig. 5.1.2. Set the control unit as follows:a) Speed n = 1500 rpmb) Torque M = 1Nmc) Operating Mode M = constantAdjust the start/set value, so that the machine starts up with a minimumload applied.Range on multimetersGenerator voltageExciter currentExciter voltageV = 1000V acI = 1A dcV = 300V dcAdjust the speed to 1500 rpm using the supply voltage, field regulator andstarter. This speed must be kept constant throughout all the measurements.3. Set the exciter current to the values given in the table 5.1, commencing at150mA. Measure the generated voltage and enter the value into table 5.1N (rpm) 1500I exc (mA) 150 180 250 350 500 650 800V exc (V) 39 45 62 86 125 165 210V GTable 5.14. Adjust the exciter current to 700mA. Keep this value constant during themeasurement by adjustment of the supply voltage, set the speed to thevalues given in table 2, commencing at 800 rpm. Measure the generatorvoltage and enter the value into the table 5.2I exc (mA) 700V exc (V) 210N (rpm) 800 1000 1250 1500 1750 2000V GTable 5.26
5. Connect the machine shown in Fig 5.2.6. Set the load resistance to 4kΩ and switch on the drive machine. Adjust thesupply voltage for a drive machine speed of 1500 rpm. This speed must bekept constant during all measurements7. Switch the exciter unit and adjust the exciter voltage of 140V. This excitercurrent must be kept constant during all measurements8. Load the generator by reducing the load resistance, to obtain the values ofcurrent flow as given in table 5.3 below. Measure the voltage generated andcalculate the apparent power producedP app = V.I.3 1/2Enter the measured and calculated values into the tableN (rpm) 1500V exc (V) 140I (mA) 70 100 120 170 200 230 250V GP app (VA)Table 5.39. From the measured and calculated values, plot the load characteristics:a) For table 5.1 : V G (V) vs V exc (V)b) For table 5.2 : V G (V) vs N (rpm)c) For table 5.3 :i) V G (V) vs I (mA)ii) P app (VA) vs I (mA)7
Page 1 and 2: EXPERIMENT 5: 3 Phase Synchronous M
Page 3 and 4: Nm min -1 X 10000 0TORQUE REVOLUTIO
Page 5: IntroductionIn a three phase synchr

EXPERIMENT 5: 3 Phase Synchronous Machine Connected as a ...

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