Question

# Consider the system Shown in the single-line diagram of Figure 4. The required sequence reactances in per unit to the same base are as follows.

Consider the system shown in the single-line diagram of Figure 4. The required sequence reactances in per unit to the same base are as follows:

G1 X1 = X2 = 0.12

G2 X1 = X2 = 0.24

G3 X1 = X2 = 0.12

Transformers X11=X12= 0.12

Lines: Positive and X13=X12= 0.20 Negative Sequence

a. Draw the positive-, and negative- sequence reactance diagrams. [6 Points]

b- Determine the The'venin's equivalent of each sequence network as viewed from a fault in the middle of line 1-3. [7 Points)

c-A line to line fault on phases B and C takes place in the middle of line 1-3. Determine the fault currents in phases B and C in per unit. [7 Points)

IB =16.037/3

IB=-IC=5.345 Amps

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