Figure 2: Armature Circuit and Metering Connections 1. Assuming that the 8221 is a Design Class A machine, use the designated sections of the datasheet to show calculations for the indicated values and to sketch the equivalent circuit. 2. Recalling that the synchronous speed for the 8221 is 1800rmin, use single-sided sheets of paper and the results obtained in Report Step I to calculate Ill and the power factor ( pf ) for operation at 1750rmin. Calculations from the DC Test: RiR1=2(1.207)31.08=12,87Ω Gaculations from the No-Load Tees: Xi+XwZx=6613208=181.68Ω Calculations from this Locked. Rotor Test: Rus Xitu and supporting work ZLR=3(1.197)67.66−cos−1(3(67.66)(1.197)95.57)=22.23+23.89)RR=22.23ΩXLR=6060(23.89)=23.89Ω Calculations from Intermediate Values: R2,X2,X2 and XM R2=22.23−12.87=9.36Ωx1=0.5(23.89)=11.95Ωx2=0.5(23.89)=11.95Ωxm=181.68−11.95=169.73Ω Equivalent Circuit [With Nimeric Values Labeled]
