1 The line to ground voltages on the high voltage side of a step-up transformer are...

1 The line to ground voltages on the high voltage side of a step-up transformer are 100 kV, 33 kV and 38 kV on phases a, b and c respectively. The voltage of phase a leads that of phase b by 100° and lags that of phase c by 176.5°. Determine the symmetrical negative phase sequence component of phase a.

2. A 3-phase, 4-wire system supplies loads which are unequally distributed in the three phases. An analysis of the current flowing in A, B and C lines show that in line A, the positive phase sequence component is 200/0° A and the negative phase sequence component is 100/60° A. The total observed current flowing back to the supply in the neutral is 300/300° A. Calculate the current in line B.

3. A 100 MVA, 20 kV alternator has X1 = X2 = 0.20 pu and X0 = 0.05 pu. The neutral of the generator is grounded through a reactor. Find the ohmic value of reactor to limit the current for a single line to ground fault equal to the current for a three-phase fault.

Expert Solution

Manojponduru answered 3 weeks ago

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