TUTORIAL PROBLEMS 1. A single phase overhead transmission line delivers 4000 kW at 11 kV at 0-8 p.f. lagging If resistance and reactance per conductor are 0-15 Q and 0-02 respectively, calculate : ) percentage regulationation, USIA (ii) sending end power factor (iii) line losses 2. A single phase 11 kV line with a length of 15 km is to transmit 500 kVA. The inductive reactance of the line is 0-5 Q/km and the resistance is 0-3 2/km. Calculate the efficiency and regulation of the line for 0-8 lagging power factor. 3. A load of 1000 kW at 0-8 p.f. lagging is received at the end of a 3-phase line 20 km long. The resistance and reactance of each conductor are 0-252 and 0-28 N per km. If the receiving end line voltage is maintained at 11 kV, calculate: [) 19-83% (i) 0-77 lag (ii) 620 kW] [97-74%, 3-34%] (i) sending end voltage (line-to-line) (ii) percentage regulation (iii) transmission efficiency 4. Estimate the distance over which a load of 15000 kW at 0-85 p.f. can be delivered by a 3-phase transmis- sion line having conductors of steel-cored aluminium each of resistance 0-905 2/phase per kilometre. The voltage at the receiving end is to be 132 kV and the loss in transmission is to be 7-5% of the load. [() 11-84 kV (ii) 7-61% (iii) 94-32%] [69-55 km] 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: (2)
TUTORIAL PROBLEMS 1. A single phase overhead transmission line delivers 4000 kW at 11 kV at 0-8 p.f. lagging If resistance and reactance per conductor are 0-15 Q and 0-02 respectively, calculate : ) percentage regulationation, USIA (ii) sending end power factor (iii) line losses 2. A single phase 11 kV line with a length of 15 km is to transmit 500 kVA. The inductive reactance of the line is 0-5 Q/km and the resistance is 0-3 2/km. Calculate the efficiency and regulation of the line for 0-8 lagging power factor. 3. A load of 1000 kW at 0-8 p.f. lagging is received at the end of a 3-phase line 20 km long. The resistance and reactance of each conductor are 0-252 and 0-28 N per km. If the receiving end line voltage is maintained at 11 kV, calculate: [) 19-83% (i) 0-77 lag (ii) 620 kW] [97-74%, 3-34%] (i) sending end voltage (line-to-line) (ii) percentage regulation (iii) transmission efficiency 4. Estimate the distance over which a load of 15000 kW at 0-85 p.f. can be delivered by a 3-phase transmis- sion line having conductors of steel-cored aluminium each of resistance 0-905 2/phase per kilometre. The voltage at the receiving end is to be 132 kV and the loss in transmission is to be 7-5% of the load. [() 11-84 kV (ii) 7-61% (iii) 94-32%] [69-55 km] 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: (2)
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single phase overhead transmission line delivers 4000 KW at 11KV 8.8 power factor lion if resistance and reactance for conductor are 0.15 women 0.02 ohm respectively calculate percentage regulation sending and power factor line losses
![TUTORIAL PROBLEMS
1. A single phase overhead transmission line delivers 4000 kW at 11 kV at 0-8 p.f. lagging If resistance
and reactance per conductor are 0-15 Q and 0-02 respectively, calculate :
) percentage regulationation, USIA
(ii) sending end power factor
(iii) line losses
2. A single phase 11 kV line with a length of 15 km is to transmit 500 kVA. The inductive reactance of the
line is 0-5 Q/km and the resistance is 0-3 2/km. Calculate the efficiency and regulation of the line for 0-8
lagging power factor.
3. A load of 1000 kW at 0-8 p.f. lagging is received at the end of a 3-phase line 20 km long. The resistance
and reactance of each conductor are 0-252 and 0-28 N per km. If the receiving end line voltage is
maintained at 11 kV, calculate:
[) 19-83% (i) 0-77 lag (ii) 620 kW]
[97-74%, 3-34%]
(i) sending end voltage (line-to-line)
(ii) percentage regulation
(iii) transmission efficiency
4. Estimate the distance over which a load of 15000 kW at 0-85 p.f. can be delivered by a 3-phase transmis-
sion line having conductors of steel-cored aluminium each of resistance 0-905 2/phase per kilometre.
The voltage at the receiving end is to be 132 kV and the loss in transmission is to be 7-5% of the load.
[() 11-84 kV (ii) 7-61% (iii) 94-32%]
[69-55 km]
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:
(2)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc4e36651-4748-4a96-a28f-2e163af36ab6%2Fcaffeae9-407a-43b5-acf5-6e241191c029%2Flewguzd.jpeg&w=3840&q=75)
Transcribed Image Text:TUTORIAL PROBLEMS
1. A single phase overhead transmission line delivers 4000 kW at 11 kV at 0-8 p.f. lagging If resistance
and reactance per conductor are 0-15 Q and 0-02 respectively, calculate :
) percentage regulationation, USIA
(ii) sending end power factor
(iii) line losses
2. A single phase 11 kV line with a length of 15 km is to transmit 500 kVA. The inductive reactance of the
line is 0-5 Q/km and the resistance is 0-3 2/km. Calculate the efficiency and regulation of the line for 0-8
lagging power factor.
3. A load of 1000 kW at 0-8 p.f. lagging is received at the end of a 3-phase line 20 km long. The resistance
and reactance of each conductor are 0-252 and 0-28 N per km. If the receiving end line voltage is
maintained at 11 kV, calculate:
[) 19-83% (i) 0-77 lag (ii) 620 kW]
[97-74%, 3-34%]
(i) sending end voltage (line-to-line)
(ii) percentage regulation
(iii) transmission efficiency
4. Estimate the distance over which a load of 15000 kW at 0-85 p.f. can be delivered by a 3-phase transmis-
sion line having conductors of steel-cored aluminium each of resistance 0-905 2/phase per kilometre.
The voltage at the receiving end is to be 132 kV and the loss in transmission is to be 7-5% of the load.
[() 11-84 kV (ii) 7-61% (iii) 94-32%]
[69-55 km]
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:
(2)
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