5. A 3-phase overhead transmission line has the following constants: Resistance/phase Inductive reactance/phase = 102 - 3502 Capacitive admittance/phase = 3 × 10 siemen If the line supplied a balanced load of 40,000 kVA at 110 kV and 0-8 p.f. lagging, calculate: (i) sending end power factor (ii) percentage regulation (iii) transmission efficiency (i) 0-798 lag (ii) 10% (iii) 96-38%)

5. A 3-phase overhead transmission line has the following constants: Resistance/phase Inductive reactance/phase = 102 - 3502 Capacitive admittance/phase = 3 × 10 siemen If the line supplied a balanced load of 40,000 kVA at 110 kV and 0-8 p.f. lagging, calculate: (i) sending end power factor (ii) percentage regulation (iii) transmission efficiency (i) 0-798 lag (ii) 10% (iii) 96-38%)

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.43P: Three ACSR Drake conductors are used for a three-phase overhead transmission line operating at 60...

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Three ACSR Drake conductors are used for a three-phase overhead transmission line operating at 60 Hz. The conductor configuration is in the form of an isosceles triangle with sides of 20, 20, and 38 ft. (a) Find the capacitance-to-neutral and capacitive reactance-to-neutral for each 1-mile length of line. (b) For a line length of 175 mi and a normal operating voltage of 220 kV, determine the capacitive reactance-to-neutral for the entire line length as well as the charging current per mile and total three-phase reactive power supplied by the line capacitance.
Consider three ideal single-phase transformers (with a voltage gain of ) put together as three-phase bank as shown in Figure 3.35. Assuming positive-sequence voltages for Va,Vb, and Vc find Va,Vb, and VC. in terms of Va,Vb, and Vc, respectively. (a) Would such relationships hold for the line voltages as well? (b) Looking into the current relationships, express IaIb and Ic in terms of IaIb and Ic respectively. (C) Let S and S be the per-phase complex power output and input. respectively. Find S in terms of S.
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