QIn a 3-phase overhead system, each line is suspended by a string of 3 insulators. The voltage across the top unit (i.e. near the tower) and middle unit are10kVand11kVrespectively.Calculate(î) the ratio of shunt capacitance to self-capacitance of each insulator, (ii) the string efficiency and (iii) line voltage.
Q: Three-bus system network consists of TWO generators located at buses 1 and 2 and TWO loads located…
A: The Given is V1=j0.5∠0° and V2=1.03, PG2=2pu SD2=0.5+j0.2 and SD3=0.6-j0.25 The Given Matrix is…
Q: A 230-kV, 100-km, 60-Hz three-phase overhead transmission line with a rated current of 900 A/phase…
A: Transmission line- The term transmission line refers to both overhead and underground cables. An…
Q: QUESTION 1: For the 3-ph, double circuit O.H.T.L shown below: 1- Find the spacing between the two…
A: According to question, For the 3-ph, double circuit O.H.T.L shown below: 1- Find the spacing between…
Q: Q2:3-phase, single circuit66kV,50 km, Overhead transmission line has horizontal spacing with 3m…
A: The solution can be achieved as follows.
Q: A three phase symmetrical double circuit line is arranged in a horizontal plane as shown in figure…
A: expression for the transposed line for the inductance. Given line is double circuit. Assume…
Q: A three phase overhead transmission line,\300 km are arranged as shown in the previous pundle…
A:
Q: Q1: a) Discuss the effect of earth on the capacitance of a line : b) Derive in expression for the…
A: (a) The earth can be considered as a conducting infinite equipotential plane. The electric flux…
Q: The capacitance between the line to neutral of a three-phase 50 Hz, 66KV overhead line conductors…
A: Frequency is given f = 50 Hz Capacitance is given C=8.3×10-7 Farad/ph/m Capacitive reactance is…
Q: A 3-phase, 60 Hz, 345 kV overhead transmission line has conductors placed in a specific manner as…
A:
Q: A 230 kV, 60 Hz, three-phase completely transposed overhead line has one ACSR 874.5-kcmil conductor…
A: From the table, the GMR of the ACSR 874.5 kcmil conductor is 0.0386ft. The inductance of the…
Q: The 130 km long three phase 50HZ, 115kV transmission line consisting of 3 conductors are placed at…
A: In the long three phase 3 conductor are in triangle Find the capacitance per meter and per km…
Q: A 45-km, 220-kV, 60-Hz three-phase overhead transmission line has a per-phase resistance of 0.2…
A: Transmission lines- Transmission lines are basically a part of an electrical system, through which…
Q: A bundled 500kv, 60Hz three phase completely transposed overhead line having three ACSR…
A: Consider the area of the bundle conductor is , A=556.5 mm2πr2=556.5r=556.5πr=13.3093 mm Consider the…
Q: cm. 2. Taking the dielectric strength of air to be 30 kV/cm, calculate the disruptive critical…
A: Given Data: m = irregularity factor = 1 r = 1 cm g = 30 kv/cm (peak) = 30 kv/sqrt(2) (rms) d=…
Q: A single-phase overhead transmission line consists of two solid aluminum conductors having a radius…
A: Line inductance is given by LT=4×10-7lnDr' H/m Here, D represents the spacing between the conductor…
Q: Problem: A three phase transmission line is being supported by 3 disc insulators. The potential…
A:
Q: In single phase AC distribution system, the net drop is the sum of the drop in resistance due to the…
A: In single phase AC distribution system, we will have resistance as well as reactance components.
Q: Example A single phase transmission line has two parallel conductors 3 m apart, the ra- dius of each…
A:
Q: Set up and solve the system of equations for the currents i,, iz, and iz in the branches of the…
A: Given Circuit
Q: In the power system whose single line diagram is shown below, the line cross section is 95 mm2, the…
A: we are assuming load voltage KVA and kW ratings are with reference to supply voltage of 10 kV and we…
Q: Discuss with block diagram, the principle of operation of single phase energy met
A: (i provide you the solution in RULE PAPER for easily understand to the diagram and its related…
Q: In a 3-phase overhead system, each line is suspended by a string of 3 insulators. The voltage across…
A: Given three phase overhead system , each line is suspended by a string of 3 insulators The voltage…
Q: The capacitance between the line to neutral of a three-phase 50 Hz, 66KV overhead line conductors…
A: In this question, line to neutral capacitance is given for horizontal configuration..We have to find…
Q: A three-phase 60-hz transmission line has its conductors arranged in a triangular formation so that…
A: The diameter of ACSR Rook is given as 0.977 inc The capacitance to neutral is given as Cn=2πk0lnDr…
Q: 2. Contribution of load flow studies to erect new power station?
A: A power system is modelled by an electric network and solved for steady state power and voltages at…
Q: A transposed overhead transmission line has self-reactance (X;) and mutual reactance (Xm) as 0.5…
A: Given, A transposed overhead transmission line has, Self reactance, Xs=0.5 ohmkm Mutual reactance,…
Q: A private developer proposes to install a synchronous type generating plant connected to the local…
A: Answer(1) According to the given data The generator produces 14 MW at 11 kV So, during the peak…
Q: 6.6. In the power system network shown in Figure 6.5, bus 1 is a slack bus wi V = 1.020° per unit…
A: In this question we will use Gauss siedel method to determine voltage at bus 2 and S1 and power loss…
Q: The capacitance between the line to neutral of a three-phase 50 Hz, 66KV overhead line conductors…
A: Capacitance between line to neutral i.e. phase capacitance is 7.4*10-7Farad/m Now in a 3-phase…
Q: Q2. Figure Q2 shows the single-line diagram. The scheduled loads at buses 2 and 3 are as marked on…
A: Note: We are authorized to answer three subparts at a time since you have not mentioned which part…
Q: Explain the following items i) Steps used to draw the equivalent impedance diagram of the network…
A: i) Procedure to draw impedance diagram 1. Establish Base Voltage through the System 2. Calculate the…
Q: A 345-kV transmission line has a series impedance of (4 + j60) Q and a shunt admittance of j2 ×…
A: Given values are - SBase=100MVAVBase=345kVZ=4+j60Y=j2×10-3S
Q: The conductor of a single-phase 60-Hz line is a solid round aluminum wire having a diameter of 0.412…
A: Inductance: It is a passive two-terminal electrical component and measured in Henry (H). When…
Q: For a single phase ac voltage controller/chopper, which is designed by using thyristors, with the…
A:
Q: The capacitance between the line to neutral of a three-phase 50 Hz, 66KV overhead line conductors…
A: Find the capacitive reactance of transmission line? If capacitance c = 7.7×10-7 F/ph/m…
Q: Each line of a 3-phase system given in figure is suspended by a string of 5 identical disks and the…
A:
Q: The annual load duration curve of a power supply system may be considered as straight line from 40…
A: Given: The annual load duration curve of a power supply system may be considered as straight line…
Q: Each line of a 3-phase system is suspended by a string of 3 similar insulators. If the voltage…
A:
Q: Example 3 The annual load duration curve of a certain power station can be considered as a straight…
A:
Q: 3 A 3-phase, 50 Hz transmission line 100 km long, Load current i 5A at 0-9 p.f.lagging and at 110…
A:
Q: For a single phase ac voltage controller/chopper, which is designed by using thyristors, with the…
A: A rectifier circuit is used to rectify the AC power generated by this source to the DC power that…
Q: In a 3-phase overhead system, each line is suspended by a string of 3 insulators. The voltage across…
A: Given three phase overhead system , each line is suspended by a string of 3 insulators The voltage…
Q: The capacitance between the line to neutral of a three-phase 50 Hz, 66KV overhead line conductors…
A: Capacitance between line to neutral C= 8.5×10-7 F/ph/m Frequency f= 50Hz Reactance Xc ?
Q: A three phase overhead transmission line has its conductors arranged at the corners of an…
A: According to question: The capacitance 'C' of each line per km is calculated as
Q: se the method of nodal analysis to find the branch currents indicated in the networks of
A:
Q: In a transmission line system, the three-phase lines supported by using three identical string…
A: Insulator-Each conductor is provided with a sufficient thickness of insulation depending upon the…
Q: a) A 240V single phase circuit is run in conduit in 2 core 70°C PVC/PVC cable having live conductor…
A: Given: A 240V single phase circuit is run in conduit in 2 core 70°C PVC/PVC cable having a live…
Step by step
Solved in 2 steps with 2 images
- In the following network, the voltage magnitudes at all buses are equal to 1 p.u., the voltage phase angles are very small, and the line resistances are negligible. All the line reactances are equal to j1 p.u. (1) (2. P₂ = 0.1 p.u. P3 = 0.2 p.u. The voltage phase angle 83 in radian at bus 3 is (Assume one of the generator bus as slack bus and sin-¹ (0.1) = 0.1 rad) (a) -0.1 (b) -0.2 (c) 0.1 (d) 0Shunt conductance of transmission line accounts for losses. Ohmic O Windage O Series voltage drop O CoronaAlddemic Depar CIMS In an over head transmission line the conductor weight with ice loading is 2.35 kg. The total weight of the conductor is 3.45 kg. Calculate Weight due to wind per unit length. (All weights given are for unit length) Type of power generation that uses the flow of conductive gases through magnetic field for generation is Answer: In a transmission system, step up transformers are used to increase the voltage for decreasing the power losses. bp 144 10
- Consider the single-Line diagram of a power system shown in Figure 3.42 with equipment ratings given: Generator G1: 50MVA,13.2kV,x=0.15p.u. Generator G2: 20MVA,13.8kV,x=0.15p.u. Three-phase -Y transformer T1: 80MVA,13.2/165YkV,X=0.1p.u. Three-phase Y- transformer T2: 40MVA,165Y/13.8kV,X=0.1p.u. Load: 40MVA,0.8PFlagging,operatingat150kV Choose a base of 100 MVA for the system and 132-kV base in the transmission-line circuit. Let the load be modeled as a parallel combination of resistance and inductance. Neglect transformer phase shifts. Draw a per-phase equivalent circuit of the system showing all impedances in per unit.Figure 3.39 shows a oneline diagram of a system in which the three-phase generator is rated 300 MVA, 20 kV with a subtransient reactance of 0.2 per unit and with its neutral grounded through a 0.4- reactor. The transmission line is 64km long with a cries reactance of 0.5-/km. The three-phase transformer T1 is rated 350MVA.230/20kV with a leakage reactance of 0.1 per unit. Transformer T2 is composed of three single-phase transformers, each rated 100 MVA, 127/13.2kV with a leakage reactance of 0.1 per unit. Two 13.2kV motors M1 and M2 with a subtransient reactance of 0.2 per unit for each motor represent the load. M1 has a rated input of 200 MVA with its neutral grounded through a 0.4- current-limiting reactor, M2 has a rated input of 100 MVA with its neutral not connected to ground. Neglect phase shifts associated with the transformers. Choose the generator rating as base in the generator circuit and draw the positive-sequence reactance diagram showing all reactances in per unit.ii) A string of suspension insulators consists of three units if the voltage across the line unit is 20 kV. The ratio of self-capacitance to shunt capacitance of each unit is 6:1. Determine a) V1 Answer for part 1 b) V2 Answer for part 2 c) VPh Answer for part 3 d) %String Efficiency Answer for part 4
- The one-line diagram of an unloaded power system is shown below. T2 j 80 0 j 100 2 E Y uw Ts Reactances of the two sections of transmission line are shown in the diagram. The generators and transformers are rated as follows: Generator 1: 20 MVA, 13.8 kV, X" = 0.2 per unit Generator 2: 30 MVA, 18 kV, X = 0.2 per unit Generator 3: 30 MVA, 20 kV, X" = 0.2 per unit Transformer T1: 25 MVA, 220Y/13.8A kV, X = 10% Transformer T2: Single-phase units each rated 10 MVA, 127/18 kV, X = 10% Transformer T3: 35 MVA, 220Y/22Y kV, X = 10% Compute for the reactances per unit and by choosing a base of 50 MVA, 13.8kV in the circuit of generator 1. Show your complete solutions (41-48): 41. What is the generator 1 per unit reactance? a. 0.3333 b. 0.2755 c. 0.5 d. 0.2 42. What is the transformer 1 per unit reactance? a. 0.2 b. 0.1667 c. 0.1429 d. 0.0826 43. What is the transmission line 1 (point B to C) per unit reactance? a. 0.1033 b. 0.0826 c. 0.5 d. 0.2 44. What is the transformer 3 per unit reactance?…a) draw the reactance diagram based on values in A busbar. U=29 S=30 b) while the voltage in B busbar is 13kV, 17MW 0.85 inductive power factor in M1, 8MW 0.9 inductive power factor in M2, what should be the terminal voltage in generator? c) to have a 3 phase fault in B busbar, what should be the fault current?a)High Voltages are preferred for Transmission of Electricity. Why? b) Why Generation Voltage Levels are low in the range of 11 kV/ 33 kV etc? c) Why ACSR Conductors are preferred over Copper Conductors? d) Overhead Transmission Lines are preferred for Transmission of Power for Long Distances, why? e) Alternating Current is preferred over Direct Current in Power System, Why? f)Write the Installed Generation Capacity of Sultanate of Oman with curent enerqy share of Conventional and Non-Conventional Energy Sources. g) Why the Capacitance effect is neglected in Short Transmission Line. h) Distinguish between Lumped or Distributed elements in a Transmission Line.
- 2) Aşağıdaki şekilde hat gerilimi 50 Hz'de 34.5 kV rms’dir. Toplam yük 0.98 ileri güç katsayısına sahip olacak şekilde C kondansatör değerlerini hesaplayınız. (In the figure below, the line voltage is 34.5 kV rms at 50 Hz. Calculate the values of capacitor C so that the total charge has a leading power factor of 0.98.) 3 faz dengeli kaynak 20 MVA 0.75 geriDraw the per-unit reactance diagram for the system shown below. Transformers 1 and 3 are identical. Transformers 2 and 4 are identical too. 1) Choose a base of 11 KV, 100 MVA in the generator side. Calculate the current in each transmission line. 2) Choose a base of 11 KV, 100 MVA in the Motor side. Calculate the current in each transmission line. j25 +3E || kv loo MVA 9% F Bet T₁ T3 કક્ષ j18 11.5/115kv бо MVA 8% Ti = T and Ти te 11516.620 70 MA 10% T₂ ET4 11 6.6 kv 80 MVAThe rating of generator is expressed in terms of kVA Select one: True False