5.5. EXPERIMENT NO 5: NO-LOAD AND BLOCKED-ROTOR TESTS OF A THREE- PHASE INDUCTION MOTOR AIM: The aim of this experiment

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5 5 Experiment No 5 No Load And Blocked Rotor Tests Of A Three Phase Induction Motor Aim The Aim Of This Experiment 1 (46.02 KiB) Viewed 30 times

5 5 Experiment No 5 No Load And Blocked Rotor Tests Of A Three Phase Induction Motor Aim The Aim Of This Experiment 2 (34.83 KiB) Viewed 30 times

5 5 Experiment No 5 No Load And Blocked Rotor Tests Of A Three Phase Induction Motor Aim The Aim Of This Experiment 3 (34.63 KiB) Viewed 30 times

5 5 Experiment No 5 No Load And Blocked Rotor Tests Of A Three Phase Induction Motor Aim The Aim Of This Experiment 4 (32.19 KiB) Viewed 30 times

5.5. EXPERIMENT NO 5: NO-LOAD AND BLOCKED-ROTOR TESTS OF A THREE- PHASE INDUCTION MOTOR AIM: The aim of this experiment is to determine the parameters of an approximate equivalent circuit of an induction motor. Also the experiment is intended to obtain data for the calculation of the efficiency and evaluation of the performance of the machine. Table 5.1: Induction motor nameplate information: PARAMETERS RATED VALUES REMARKS Voltage IV Current | Power KWI Power Factor 1-1 Speed (rev/min Number of poles H-1 NO-LOAD TEST: Connect the circuit diagram as shown in figure 5.1. Run the motor on no-load at rated voltage. Measure the three line currents, voltages and the three-phase power supplied to the motor during the test. Complete table 5.2 and 5.3. Woc SUPPLY Voc Three-phase Induction Motor Figure 5.1: No-Load test wiring diagram
@ 61% ..ll Telkom-Monate 15:28 Back Electrical Power Enginee... Tables Memured Values UNITS w V w MEASURED VALUES Table 5.3Calculated Values PARAMETERS 7 1. - R Nav RV KAN De Aa . UNITS CALCULATED VALUES SEPARATING THE MECHANICAL LOSSES OF THE INDUCTION MOTOR: With motor connected as in Figure 5.1. increase the supply voltage in four step until qual to the red voltage and move the corresponding power input of the motor by the two wati mieten Complete Table 5.4 Mor the graph P. (V) Prolong the cure until intersection with the vertical axis. The intersection point when V-) gives the value of the total mechanical losses of the most Table & Inductie Motor Mechanical (V) PARAMETE RS P है। P: ( P (W)
@ 61% ..ll Telkom-Monate 15:28 Back Electrical Power Enginee... BLOCKED-ROTOR TEST: Block the role of the machine with a vie. Follow your instructor's vices about the fifty during the experiment Connect the diagram as shown in Fig. 32. Increase the supply voltage until the currents equal to the rate motor current Morsure line curent, voltages and the three-phase power supplied to the motor Complex Tube 35. Rower SUPPLY The idoneo Figure 5.2: Blocked-roter test wiring diagram Table SS. Med Valur PARAMETERS UNITS w A w MEASURED VALUES Table & Calculated Values PARAMETERS - Po z R. X X x X des w D UNITS a CALCULATED VALUES STATOR RESISTANCE TEST
Back Electrical Power Enginee... STATOR RESISTANCE TEST: Measure the resistance between the lines of the machine in her condition after the blocked rotor test). Make the measurements. Take the average value. Take into the consideration how the stator winding is connected (star er delta) Assign your measurements in Table 57. Table 5.71 Measured Values PARAMETERS R. Rac Re UNITS D MEASURED VALUES Practical Report: Use the practical work report template in Appendix And include the calculations in your report Forrated voltage Vw Vand current of A calculate the parameters of the approximate equivalent circuit of the motor 2 Draw the above equivalent circuit and assign the calculated values on it 3. Calculate for rated motor load and power factor 3.1 the stator current 3.2 stator copper losses, 3.3 stator iron los 3.4 yap power 3.5 rotor current, 3.6 rotor copper losses 3.7 developed power and torque 3.8 Output power and torque and the efficiency