Pick up the correct answeralongwith evde ceforexplanation2. Taking into account cost, most of the high-voltage transmission lines areA. Underground. B. Overhead C. Either of the above D. None of the aber3. If the maximum load is equal to plant capacity. The plant capacity factor is:A. 1B. zeroC. >1D. <15. Sum of continuous ratings of all the equipment connected to electric power system is defined as:A. Maximum demand B. Connected load6. Cables have more effective inB. CapacitanceC. Daily average loadthan over head transmission linesC. ResistanceD. Load variationD. All of the abov100%A. Inductance7. By which of the following methods string efficiency can be equalA. Using a guard ring B. Equal insulator voltage C. Using longcross arm D. Non of them-10. If the spacing between the conductors is decrease, the inductance of the line will be:A. IncreaseB. decreases C. Not effectedD. Non of them12. If the length of a transmission line increases, its inductance isA. increasesB. decreasesC. ConstantD. None of themC. Equal D. None of the them13. When the regulation is negative, then receiving end voltage (VR) is than sending and voltage (VS).A. LessB. More

2. Taking into account cost, most of the high-voltage transmission lines are:-- Correct: B.…

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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

Chapter8: Symmetrical Components

Section: Chapter Questions

Problem 8.10P

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In an outdoor substation the three bus-bar conductors are supported by units of post type insulators. Each unit consists of a stack of 3 pin type insulators fixed one on the top of the other. The voltage across the lowest insulator is 13kV and that across the next unit is 12KV. Estimate: 17. i. ratio of mutual to self-capacitance ii. the bus-bar voltage of the substation. iii. Efficiency across the string of insulators
1. FIGURE 52 shows the one-line diagram of a simple three-bus power system with generation at bus I. The voltage at bus l is V1 = 1.0L0° per unit. The scheduled loads on buses 2 and 3 are marked on the diagram. Line impedances are marked in per unit on a 100 MVA base. For the purpose of hand calculations, line resistances and line charging susceptances are neglected a) Using Gauss-Seidel method and initial estimates of Va 0)-1.0+)0 and V o)- ( 1.0 +j0, determine V2 and V3. Perform two iterations (b) If after several iterations the bus voltages converge to V20.90-j0.10 pu 0.95-70.05 pu determine the line flows and line losses and the slack bus real and reactive power. 2 400 MW 320 Mvar Slack 0.0125 0.05 300 MW 270 Mvar FIGURE 52
Three zones of a single-phase circuit are identified shown in Figure below. The zones are connected by transformers T1 and T2, whose ratings are also shown. Using base values of 33 kVA and 232 volts in zone 1, Find: 1- Draw the per-unit circuit including the per-unit impedances and the per-unit source voltage. 2- Calculate the load current both in per-unit and in amperes (actual or original value). Vs Zone 1 232.940° Vs G. 38 T₁ 30 KVA 240/480 volts Xeq = 0.10 p.u. Zone 2 Xiine = 4 Ω T₂ 20 KVA 460/115 volts Zload = Xea = 0.10 p.u. Zone 3 u 1+j2.2 Ω 2
Give example scenarios in 'Power Grid Extension' and explain
Analyse several voltage and current situations in different loading scenarios in a simplified radial (transformer to consumption) medium-voltage power system example. There are only 2 nodes in the 35 kV line – node 0 from the 110/35 kV and node 1 with one consumer. The physical characteristics of the line and the loading scenarios are individualized for each student – please see the attached file Excel “WM9P3 Task1 data” for your particular data set. Briefly reflect on the complexity of the calculations for known input or output voltage, as well as for fixed or voltage-dependent consumption in this simple power system model. Analyse and discuss the sensitivity of the voltage drop [in % of amplitude and the degrees of phase] with respect to the current level [in %] and to the power factor.
The base current and base voltage of a 345 kV system are chosen to be 3000A and300kV respectively. Determine the base impedance and the per-unit voltage for thesystem.
An AC three phase distribution system (given in Figure 2), which has end user with balanced three phase (10A) load, is given in the figure. The phase-neutral voltages of the transformers are given as V1=224V, V2=225V, V3=228V and V4=231V respectively. a) Calculate phase-neutral voltage of the bus-bar (B). b) Calculate currents of the transformers (I1, I2, I3 and I4) c) Calculate phase-neutral voltage of the point K while the output of TR3 and TR4 (xy) have been short circuited for a transient time (transformers are still operational) by the line fault.
1/ Power loss due to corona is: a. Inversely proportional to frequency. b. Proportional to frequency. c. Frequency does not effect. d. All these answers are wrong. 2/ We prefer High voltage DC (HVDC) transmission system than High Voltage AC transmission system according to the cost, when: a. The distance of the line is more than B00 km. b. The distance of the line is less than 300 km. c. The distance of the line is equal to 300 km. d. All the above answers are wrong. 3/ HVDC Transmission has lower corona losses than HVAC Transmission because: a. HVDC Transmission tower is less height than HVAC Transmission tower. b. HVDC Transmission system work with zero frequency than HVAC Transmission system of 50 Hz. c. HVDC Transmission currents is uniform distributed in the all cross section of the system conductors than HVAC Transmission due to skin effect. d. All of the above answers are wright.
I need an expert. I previously sent a request, and the expert divided the time periods equally for both areas A and B. I did not understand how and why this was done. Please explain to me with a diagram why we do this. A generation station of 3 MW supply a two regions A & B .The line losses are neglected and the load variation of these regions is as follow: Region A (Time) 11 a.m From midnight to From 5 am to From 8 a.m to From 11 a.m to Load (kw) Region B (Time) 5 a.m No-load 8 a.m 1200 800 6 p.m No-load From From From midnight to 6 a.m to 3 p.m to 7 p.m to 6 a.m 3 p.m 7 p.m Load (kw) 400 900 No-load 9 p.m 1800 From From 6 p.m to midnight 600 From 9 p.m to midnight 200 1-Plot The daily load curve of the total system.
The first question has been solved. Qii?
b) The one-line diagram for a simple power system is given in Figure 1(b). į. Draw the impedance diagram of the system. i. Construct the bus admittance matrix, Xeus and bus impedance matrix, Zous of the system. I. Evaluate the fault current, bus voltages and line current during the flow when a balanced three-phase fault occurs on bus 1. bus 1 bus 2 j65 N G G 25 MVA 25 MVA 13.8 kV 15% 13.2/69 kV 11% 25 MVA 69/13.2 kV 11% 15 MVA 13 kV 15% Figure 1(b) m
The single line diagram of a power system is shown in Figure Q2.1 including generator and transformer winding connection and earthing details. The parameters for this system have been calculated on a common 100 MVA base and are given in Table Q2.1. All resistances and shunt susceptances are neglected. This system experiences a single line to ground fault at a point F on line L1. The point F is at a distance d from Bus 4 along the line L1. The total length ?? of the line L1 is 50 km. Note that the location of ?? is not drawn to scale in Figure Q2.1. The fault current at the fault point F is measured to be 6.106 kA. i) Determine the zero, positive, and negative sequence Thevenin equivalent impedances as seen at the fault point F. These should be evaluated in per unit and shown as a function of d.ii) Use the sequence impedances calculated in part (i) to determine the distance d of the fault (in km) from Bus 4.

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