Question
Electric machines A three-phase synchronous generator 7.2 KVA, wye-connected. The synchronous impedance per phase is 0.5+j6 ohms. The fixed loss is 140W. When the generator
Electric machines A three-phase synchronous generator 7.2 KVA, wye-connected. The synchronous impedance per phase is 0.5+j6 ohms. The fixed loss is 140W. When the generator works at its rated load. The generator is connected to a 7.8 KVA 120/360 V three-phase transformer, wye connected. With the following parameters: RH=1.2 ohms XH=1.5 ohms RCH=2.5 Kilo ohms XMH=2 kilo ohms RL=0.3 ohms XL=0.27 ohms A 360 V Y-induction motor with the following characteristics will be connected to its secondary: Re=0.5 ohms Xe=0.75 ohms RC=950 ohms XM=700 ohms R2=0.15 ohms X2=0.65 ohms. The mechanical losses are 2% of the output power. And its slip is 2.2%. Determine: a) Equivalent circuit per phase of the complete circuit. b) Induction motor efficiency c) Transformer efficiency d) The value of the induced voltage in the synchronous generator e) The efficiency of the synchronous generator.
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