The following figure is a single line diagram three phase four wire Y grounded primary feeder 11KV.. There is 2262 KVA uniformly increasing load. Given distances oa =1 mi, ad = 1.7, dc = 1.4 mi. and r/mile = 0.4 N. Assuming that all the loads have a 0.85 lagging power factor Substation a d 13 12 Lumped load (2000 kVA)

The following figure is a single line diagram three phase four wire Y grounded primary feeder 11KV.. There is 2262 KVA uniformly increasing load. Given distances oa =1 mi, ad = 1.7, dc = 1.4 mi. and r/mile = 0.4 N. Assuming that all the loads have a 0.85 lagging power factor Substation a d 13 12 Lumped load (2000 kVA)

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.23P: Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of...

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Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given a follows: G:90MVA22kVx=0.18perunitT1:50MVA22/220kVx=0.10perunitT2:40MVA220/11kVx=0.06perunitT3:40MVA22/110kVx=0.064perunitT4:40MVA110/11kVx=0.08perunitM:66.5MVA10.45kVx=0.185perunit Lines I and 2 have series reactances of 48.4 and 65.43, respectively. At bus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.
The units of admittance, conductance, and susceptance are siemens. (a) True (b) False
Determine the bus admittance matrix (Ybus) for the three-phase power system shown in Figure 6.23 with input data given in Table 6.11 and partial results in Table 6.12. Assume a three-phase 100 MVA per unit base. TABLE 6.11 Bus input data for Problem 6.20 TABLE 6.12 Partially Completed Bus Admittance Matrix (Ybus) for Problem 6.30
PowerWorid Simulator case Problem 3_60 duplicates Example 3.13 except that a resistance term of 0.06 per unit has been added to the transformer and 0.05 per unit to the transmission line. Since the system is no longer lossless, a field showing the real power losses has also been added to the oneline. With the LTC tap fixed at 1.05, plot the real power losses as the phase shift angle is varied from 10 to +10 degrees. What value of phase shift minimizes the system losses?
Which termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformer
Refer to the 5-bus data given below. Sbase = 400 MVA, the base voltage is 15.0 kV for buses 1 and 3, and 345 kV for buses 2, 4, 5. Note that 1-5 and 3-4 are 15/345 kV transformers.a) Draw a one-line diagram of the power system.b) Find the elements Y23, Y43, Y11 Y33 of the system bus admittance matrix.
Shown are two buses connected via a transmission line. Connected to Bus 1 is a generator(modelled as a voltage source V1), and to Bus 2 is a generator( with Voltage V2) and a load. The line impedance Z = R + jX is not known. Three-phase load is forecasted as 100MW + 60MVar. Generator at Bus 2 is scheduled to deliver 40MW and its excitation is adjusted for the machine to deliver 55 MVar. Voltage at Bus 1 is 241 KV angle 10 deg, while voltage at bus is 230 kV; use V2 as the reference for all angles. 1. What is the current (RMS) in amperes drawn by the load connected to Bus 2? 2. How much real power (in MW) is delivered by the generator connected to Bus 1? 3. What is the total real power loss along the line, in percent of the load? 4. What is the X/R Ratio of the line impedance?
An 11 KV, 3-phase transmission line has a resistance of 1.5 Ω and reactance of 4 Ω per phase.Calculate the percentage regulation and efficiency of the line when a total load of 5000 KVA at 0.8 lagging power factor is applied at 11KV at the distant end.
Line impedances for the power system shown in Figure 1 are Z12 = Z23 = 3.0 + j40.0 Ω, and Z24 = 6.0 + j80.0 Ω. Reach for the zone 3 B12 impedance relays is set for 100% of line 1–2 plus 120% of line 2–4. (a) For a bolted three-phase fault at bus 4, show that the apparent primary impedance “seen” by the B12 relays is Zapparent = Z12 + Z24 + (I32/I12)Z24 where (I32/I12) is the line 2–3 to line 1–2 fault current ratio. (b) If |I32/I12| > 0.20, does the B12 relay see the fault at bus 4?
The single line diagram of a power system is shown below. Load represented as impedance, (13.2) kV voltage It draws 60 MVA power from the system when it is below and (0.9) back power factor. Generators and transformers The related electrical parameters are given below. According to this; a) Calculate all impedances in this given circuit in pu and draw the equivalent impedance diagram of the circuit. (Select the base values as 100 MVA and 13.8 kV.) b) Since the voltage values of the generators are given as E1=1.1∟0° pu and E2=1.25∟10° pu, Calculate the value of the voltage (V1).
Two similar star-grounded synchronous generators, one of which has its star point grounded, supply 11 kV three-phase busbars. An 11/66 kV delta/star connected transformer with the star point grounded is supplied from the busbars. The impedances referred to 11 kV, are as given below : Generator Transformer Impedance to positive-sequence currents j3.0 Ω j 3.0 Ω Impedance to negative-sequence currents j 2.0 S2 j3.0Ω Impedance to zero-sequence currents j 1.012 j3.0Ω Determine the fault current for an LG fault (a) on a busbar, and (b) at an hv terminal of the transformer. (c) Find also the voltage to ground of the two sound busbars in case (a).
What load can be delivered by a 3-phase overhead line 5 km long with a pressure drop of 10%. Given that the station voltage is 11 kV, resistance per km of each line 0.09 Ω, reactance per km 0.08 Ω and the power factor of the load 0.8 lagging. ..