EE 740 Professor Ali Keyhani Lecture #8 Homework Solutions.

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Presentation transcript:

EE 740 Professor Ali Keyhani Lecture #8 Homework Solutions

Bank T1Bank T2 120 MVA 35kV/350kV Z=(1+j8%) on ratings 30MVA/each 200kV/20kV Z=(1+j7%) on ratings Z=12.8+j64 Y/2=j.280 mS Vb 1 =19.9kVVb 2 =199kVVb 4 =11.5kV 1234 YY

Sb = 100/3 Vb 1 Vb 2 Vb 3 Vb

Bank T1Bank T2 35 MVA/each 138kV/34.5kV Z=(1+j7.5%) on ratings 90MVA 35kV/7.2kV Z=(1+j6%) on ratings Z=5+j20 Y/2=j0.10 mS Vb 1 =138kVVb 2 =19.9kV Vb 4 =4.093kV 1234 YY

ZT 1 Zline ZT 2 Y/

Y P QPQ Vb=230kVVb=23kV j.06 (+) S 3phase =300 PQ j.06 (-) S 3phase =300 j.10 P Q (0) S 3phase =300