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lecture17 - B Ib n Ia A Z L ∼ n ∼ N Z L ∼ Zn 1 Zn Ib...

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EE740 Professor Ali Keyhani Lecture #17 Zero, Positive, and Negative Sequences for Transformers
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Zero Sequence Current. C Ic Ic C n 1 Z L B Ib n Ia A Z L n 0 N In Zn Z L Zn 1 Zn 0 Z N I N Ib B In 1 A Ia In 0 HV LV In 0 = I N Why? Van+Vbn+Vcn=InZn I n 1 = In Why? Assume Supply Voltages are Unbalanced: Vn=Van+Vbn+Vcn C I 0 =1/3[Ia+Ib+Ic]=1/3In V 0 =1/3(Van+Vbn+Vcn) I 1 =1/3[Ia+aIb+a 2 Ic] A I 2 =1/3[Ia+a 2 Ib+aIc] In=3I 0 B
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Zero Sequence Current. C Ic Ic C n 1 Z L B Ib n Ia A Z L n 0 N Z L Zn 1 Zn 0 Z N I N Ib B In 1 A Ia In 0 HV LV Van+Vbn+Vcn=InZn Van+Vbn+Vcn=Vn 0 Assume Supply Voltages are Unbalanced: For HV side For LV side I 0 = 0 Why? I 0 = 0, In 1 = 0 Why? In 0 = 0, I N = 0 Why? I 1 0 I 1 0 I 2 0 I 2 0
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Zero Sequence Current. C Ic Ic C n 1 Z L
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Unformatted text preview: B Ib n Ia A Z L ∼ n ∼ N Z L ∼ Zn 1 Zn Ib B In 1 A Ia In HV LV Assume Supply Voltages are Unbalanced: For HV side For LV side I = 0 Why? I = 0 Why? In = 0 Why? In 1 = 0 Why? I 1 ≠ 0 I 1 ≠ I 2 ≠ 0 I 2 ≠ Zero Sequence Current. C Ic Ic C n 1 Z L B Ib n Ia A Z L ∼ n ∼ N In Zn Z L ∼ Zn 1 Zn Ib B In 1 A Ia In HV LV Assume Supply Voltages are Unbalanced: For HV side For LV side I = 0 Why? I = 0 Why? In 0 = 0 Why? I n 1 = 0 Why? I 1 ≠ 0 I n = 0 Why? I 2 ≠ 0 I 1 ≠ I 2 ≠...
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