Due to the enlarging of served area, it is decided to change the line to line primary voltage. Assuming that number of feeders of the new area A2 is 10 and using voltage square factor, The new primary voltage VLLnew that should be used in the new substation SS1 is:
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- X₂=0.1 1 XL +03 Soto X₁ = 0.2 X = 0.1 X = 0.1 Above is the one-line diagram of a simple power system. Each generator is represented by an emf behind the subtransient reactance. All impedances are expressed in per unit on a common base. All resistances and shunt capacitance are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. A symmetrical fault occurs at bus 1 through a fault impedance Z, =j0.08 per unit. a) Using Thevenin's Theorem, determine the impedance to the point of fault and the fault current in per unit. b) Find the bus voltages and line currents during the fault. 2 O otoThe symmetrical short circuit current is quantity in nature. O Alternating O Exponential O Ramp O DirectThe formula to calculate the load regulation is
- Does an open- operation, the kVA rating compared to that of the original thr-phase bank is (a) 2/3 (b) 58 (c) 1Match the following: (i) Hysteresis loss (a) Can be redud by constructing the core with laminated sheets of alloy steel (ii) Eddy current loss (b) Can be reduced by the use of special high grades of alloy stl as core material.The busbars of a gonerating station are divided into two soctions A and B by a busbar reactor rated at 8000KVA with 9% reactive drop. On busbar A there are two generators each of 8000 KVA with 12.5% reactance and on busbar B there are two generatore each of 10,000KVA with 10% reactance. Feeders are taken. from sections A and B separately. Calculate the rupturing capacity of each foeder switchgear for 3-phase faults which may occur on any feeder. Ans: Feeder A 189 MVA; Feeder B 252 MVA
- An 11 kV generating station has four identical 3-phase alternatorsGl, G2, G3 and G4 each of L0 MVA capacity and l2%o reaclarce.There are two section of bus-bar P and Q, linked by a reactor X ratedat 10 MVA with 24o/oreactance. From section Q load is taken througha 6 MVA, i 1kV/66kV step-up transformer (T1) having a reactance of37o. Determine the fault current if a three-phase short-circuit occursnear the high voltage terminal of the transformer (F) as shown inFigure.Assume prefault voltages to be 1 pu and prefault currents to be zero15) Kirchhoff's Voltage Law (KVL) states that A) the product of the phasor voltages around any closed path must equal zero. B) the sum of the phasor voltages around any closed path does not have to equal zero. C) the sum of the phasor voltages around any closed path must equal zero. D) the sum of the phasor voltages around a closed path cannot include "through the air."A 400 MVA synchronous machine has H, = 4.6 MJ/MVA and a 1200 MVA machine has H₂=3.0 MJ/MVA. The two machines operate in parallel in a power plant. Find out H relative to a 100 MVA base.
- In a GAN model how are the discriminator and the generator trained? Group of answer choices The generator is first completely trained, then the discriminator can be trained Simultaneously In alternating manner The discriminator is first completely trained, then the generator can be trained7. Three load units A, B, and Care connected in parallel and take currents that are respectively 11 A, 10A and 15A. Assuming IA to be the reference phasor, IB leads IA by 30degrees and IC legs behind IA by 65degrees. Calculate the total (resultant) currentand angle it makes with the x-axis.QUESTION TWO Power transformers are used in the power system to change the voltage levels to a level suitable for generation, or transmission or distribution. They are three-phase transformers, and can either be constructed as a single-unit or a bank of three single-phase units. In a hydro power station, a number of synchronous generators are used to generate electricity at 17.5 kV. The voltage is stepped up to 330 kV for transmission by parallel connected three-phase transformers. Each three-phase transformer consists of a bank of three single-phase units with each unit rated 100 MVA 50 Hz, 330/17.5 kV. (a) With good reasons, explain the most suitable connection of the windings on the high-voltage side and the low-voltage side of each three-phase transformer, respectively. (b) What are the advantages of using a bank of single-phase transformers for each three-phase unit? (c) What are the disadvantages of using a bank of single-phase transformers for each three-phase unit? (d) At a…