Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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A substation rated 1250 kVA is operating at full-load at 0.8 pf lagging and to carry an additional load of 170 kW at 0.85 pf lagging. With the mentioned power factor, the substation is experiencing inefficient electrical system: high power losses, high voltage drops in the electrical equipment, and high electricity bill. To reduce power losses and to reduce the electricity bill, power factor correction is to be of high importance and consideration.
Find:
- power phasor diagram.
- computation of the following:
- additional substation capacity in KVA
- shunt capacitor KVA.
- Which alternative is more economical if cost/kVA of additional substation capacity is $400.00 and the cost/kVA of shunt capacitor is $180?
Transcribed Image Text:A substation rated 1250 kVA is operating at full-load at 0.8 pf lagging and to carry an additional
load of 170 kW at 0.85 pf lagging. With the mentioned power factor, the substation is experiencing
inefficient electrical system: high power losses, high voltage drops in the electrical equipment,
and high electricity bill. To reduce power losses and to reduce the electricity bill, power factor
correction is to be of high importance and consideration.
Find:
●
power phasor diagram.
●
computation of the following:
O
additional substation capacity in KVA
shunt capacitor KVA.
Which alternative is more economical if cost/kVA of additional substation
capacity is $400.00 and the cost/kVA of shunt capacitor is $180?
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- Q.3/(¹- a. prove that the circulating current value decrease with the increase in the load between the tv transformers connected in parallel. b. Two 1-ph transformers 6000/400V, the first 200kVA and the other is 350kVA when performing the short circuit test the first need 5% of rated voltage to circulate the full-load current at 0.2 power factor while the related values for the other are 4% and 0.1, Now how will they share a load of 300kW at 0.9 power factor lagging.arrow_forwardA substation rated 1250 kVA is operating at full load at 0.8 pf lagging and to carry an additional load of 170 kW at 0.85 pf lagging. With the mentioned power factor, the substation is experiencing inefficient electrical system: high power losses, high voltage drops in the electrical equipment, and high electricity bill. To reduce power losses and to reduce the electricity bill, power factor correction is to be of high importance and consideration. In this regard, the owner requested to prepare a summary report consisting of the following details: A rightful power phasor diagram.arrow_forward7. Two 440V, 60Hz, 6 pole, 30 AC generators are running in parallel. The first supplies the busbars with 525kW of power at a power factor of 0.79 lagging. The second provides the busbars with 415kW at a power factor of 0.96 lagging. An additional load that requires 275kW at a power factor of 0.89 leading is added to the busbars. The two generators have their governor and magnetization controls adjusted so they provide 440V, 60Hz and share the active and reactive powers equally. What is the active and reactive power produced by each and their line currents and speeds?arrow_forward
- 7.arrow_forward6. In figure below the rating of reactance and various components are shown. A load of 50MW at p.f. lagging is taking from the 33kv substation which is to be maintained at 30kv. Calculate the terminal voltage of the synchronous machine (Vs) in pu, also represent the line and transformer in series reactance. The system is three phase system V6 11 kV 132 kV 132 kV 33 kV 50 MW Line 0.8 p.f. lagging j1000 50 MVA X 10% 50 MVA X 12% 30 kVarrow_forward
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