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5. A 3-phase line 3 km long delivers 3000 kW at a p.f. 0-8 lagging to a load. The resistance and reactance per km of each conductor are 0-4 2 and 0-3 2 respectively. If the voltage at the supply end is maintained at 11 kV, calculate :

5. A 3-phase line 3 km long delivers 3000 kW at a p.f. 0-8 lagging to a load. The resistance and reactance per km of each conductor are 0-4 2 and 0-3 2 respectively. If the voltage at the supply end is maintained at 11 kV, calculate :

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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5. A 3-phase line 3 km long delivers 3000 kW at a p.f. 0-8 lagging to a load. The resistance and reactance per km of each conductor are 0-4Q and 0-3 2 respectively. If the voltage at the supply end is maintained at 11 kV, calculate : 240 Principles of Power Syste m (i) receiving end voltage (line-to-line) (ii) line current (iii) transmission efficiency. () 10.46 kV (i) 207 A (ii) 95%] 6. A short 3-0 transmission line with an impedance of (5+j 20) 2 per phase has sending end and receiving end voltages of 46-85 kV and 33 kV respectively for some receiving end load at a p.f.of 0-8 lagging. Determine : (i) power output (ii) sending end power factor 7. A substation receives 6000 kVA at 6 kV, 0.8 p.f. lagging on low voltage side of a transformer from a generating station through a 3-phase cable system having resistance of 7 2 and reactance of 2 Q per phase. Identical 6600/33000 V transformers are installed at each end, 6600 V side being delta connected and 33000 V side star connected. The resistance and reactance of each transformer are 1 2 and 9 2 () 22-86 kW (i) 0-657 lag) [6778 V] 8. A short 3-phase transmission line connected to a 33kV, 50 Hz generating station at the sending end is required to supply a load of 10 MW at 0-8 lagging power factor at 30 kV at the receiving end. If the minimum transmission efficiency is to be limited to 96%, estimate the per phase value of resistance and [2-4 Q; 0-028 H] respectively, referred to h.v. side. Calculate the voltage at the generating station bus bars inductance of the line. 9. A single phase transmission line is delivering 500 kVA load at 2 kV. Its resistance is 0-2 2 and inductive reactance is 0-4 2. Determine the voltage regulation if the load power factor is (i) 0-707 lagging (ii) 0-707 leading. () 5-3% (ii) -1-65%]
Transcribed Image Text:5. A 3-phase line 3 km long delivers 3000 kW at a p.f. 0-8 lagging to a load. The resistance and reactance per km of each conductor are 0-4Q and 0-3 2 respectively. If the voltage at the supply end is maintained at 11 kV, calculate : 240 Principles of Power Syste m (i) receiving end voltage (line-to-line) (ii) line current (iii) transmission efficiency. () 10.46 kV (i) 207 A (ii) 95%] 6. A short 3-0 transmission line with an impedance of (5+j 20) 2 per phase has sending end and receiving end voltages of 46-85 kV and 33 kV respectively for some receiving end load at a p.f.of 0-8 lagging. Determine : (i) power output (ii) sending end power factor 7. A substation receives 6000 kVA at 6 kV, 0.8 p.f. lagging on low voltage side of a transformer from a generating station through a 3-phase cable system having resistance of 7 2 and reactance of 2 Q per phase. Identical 6600/33000 V transformers are installed at each end, 6600 V side being delta connected and 33000 V side star connected. The resistance and reactance of each transformer are 1 2 and 9 2 () 22-86 kW (i) 0-657 lag) [6778 V] 8. A short 3-phase transmission line connected to a 33kV, 50 Hz generating station at the sending end is required to supply a load of 10 MW at 0-8 lagging power factor at 30 kV at the receiving end. If the minimum transmission efficiency is to be limited to 96%, estimate the per phase value of resistance and [2-4 Q; 0-028 H] respectively, referred to h.v. side. Calculate the voltage at the generating station bus bars inductance of the line. 9. A single phase transmission line is delivering 500 kVA load at 2 kV. Its resistance is 0-2 2 and inductive reactance is 0-4 2. Determine the voltage regulation if the load power factor is (i) 0-707 lagging (ii) 0-707 leading. () 5-3% (ii) -1-65%]
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