Which of the following factors is not a main factor which will impact the transmission line loadability? A. Voltage-drop limit B. Surge impedance loading C. Thermal limit D. Steady-state stability limit
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- Transmission line conductance is usually neglected in power system studies. True FalseConsidering two parallel three-phase circuits that are close together, when calculating the equivalent series-impedance and shunt-admittance matrices, mutual inductive and capacitive couplings between the two circuits can be neglected. True FalseI) Determining the voltage amplitude and angle values of each busbar II) To determine the active and reactive power values flowing from each transmission line III) To determine the active and reactive power loss values in each transmission line IV). Determining the total active and reactive power loss values in transmission lines in the power system V) To determine the power system temporary stability limit values To explain the reasons for load flow in power systems given above, which option is the correct one of the 5 explanations given? A) II,III,IV B) I,II C) I,II,III D) I,IV E) I,II,IV
- Q2. Figure Q2 shows the single-line diagram. The scheduled loads at buses 2 and 3 are as marked on the diagram. Line impedances are marked in per unit on 100 MVA base and the line charging susceptances are neglected. a) Using Gauss-Seidel Method, determine the phasor values of the voltage at load bus 2 and 3 according to second iteration results. b) Find slack bus real and reactive power according to second iteration results. c) Determine line flows and line losses according to second iteration results. d) Construct a power flow according to second iteration results. Slack Bus = 1.04.20° 0.025+j0.045 0.015+j0.035 0.012+j0,03 3 |2 134.8 MW 251.9 MW 42.5 MVAR 108.6 MVARQ4(b) The equivalent circuit of a single phase short transmission line is shown in Figure Q4(b). Here, the total line resistance and inductance are shown as lumped instead of being distributed. i) Sketch the phasor diagram and assess with by labeling the details for the A.C. series circuit shown in Figure Q4(b) for the lagging power factor at load point (Vn). ii) Summarize, what if the load change from low value to high value shown in Figure Q4(b). R XL el Vs Vn Figure Q4(b) LoadThe sample large power system network data's are given below, The total number of buses is 5 Three-phase short circuit fault subjected at the bus 5 The initial voltage of the faulted bus is 1.0 p.u The Zbus matrix element Z55 is 0.704 p.u Fault impedance Zf= 0.33 p.u Fault current (If )in p.u ..........
- Discuss the role of FACTS (Flexible Alternating Current Transmission Systems) devices in power system control and optimization.The equivalent circuit of a single phase short transmission line is shown in Figure Q4 (b). Here, the total line resistance and inductance are shown as lumped instead of being distributed. i) Sketch the phasor diagram and assess with by labeling the details for the A.C. series circuit shown in Figure Q4 (b) for the lagging power factor at load point (Vn). ii) Summarize, the impact of voltage regulation and efficiency, if the line resistance and line increases are doubled Figure Q4(b). R XL Vs Vn Figure Q4(b) Loadi. Some reasons for adopting high transmission line voltages are to improve ------and the enhancement of. ii. The per phase power transmitted under surge impedance loading of a transmission line is given by: iii. Power transmission lines are limited in their power handling capability by the and
- bus. The voltage magnitude and phase angle are the quantities to be determined after load fiow analysis forSubject: Electrical & Electronics Engineering Course: Power Systems30) In a lightly loaded long distance EHV lines, line loading is and has a power factor: (A) Capacitive, lagging. (B) Capacitive, leading (C) Inductive, lagging (D) Inductive, leading. please contact me in whatsapp +962782974574