Calculate the voltage of a area insulated susbstation if this outdoor substation has three busbars and...
Calculate the voltage of a area insulated susbstation if this outdoor substation has three busbars and supplied by units of post insulators. Each unit consists of 3 suspension type pin insulators with the voltage across the line unit is 9KV, while that across the middle unit is 7.5KV.
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Calculate the voltage of a area insulated susbstation if this
outdoor substation has three busbars and...
A string of suspension insulators consists of three units. The capacitance between each link pin and earth is one-sixth of the self-capacitance of each unit. If the maximum voltage per unit is not to exceed 35 kV, determine the maximum voltage that the
A string of suspension insulators consists of three units. The capacitance between each link pin and earthis one-sixth of the self-capacitance of each unit. If the maximum voltage per unit is not to exceed 35 kV,determine the maximum voltage that the string can withstand. Also calculate the string efficiency.[84·7 kV; 80·67%]
In a string of three identical suspension insulators units supporting a transmission line conductor, if the...
In a string of three identical suspension insulators units supporting a transmission line conductor, if the self-capacitance of each unit is denoted as ‘C’ farads, the capacitance of each connector pin to ground can be taken as 0.1 C farads. Determine the voltage distribution across the string, if the maximum permissible voltage per unit is given as 20 kV. Determine the string efficiency. Derive the formula used to calculate the string efficiency with a neat sketch where ever required
A three-phase overhead transmission line is being supported by three-disc suspension insulators; the potentials across the...
A three-phase overhead transmission line is being supported by three-disc suspension insulators; the potentials across the first and second insulator from the top are 8 kV and 11 kV respectively. Calcualte (i) the line voltage (ii) the ratio of capacitance between pin and earth to self capacitance of each unit (iii) the string efficiency
THESE ARE THE QUESTIONS FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS AND THE CHAPTER IS MECHANICAL DESIGN...
THESE ARE THE QUESTIONS FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS AND THE CHAPTER IS MECHANICAL DESIGN OF TRANSMISSION LINES . THE ANSWERS ARE GIVEN WITH THE QUESTION PLEASE DO ALL THE QUESTIONS PROPERLY ..DONOT SKIP ANY STEP AND DO YOUR BEST 3). A transmission line has a span of 150 m between level supports. The cross-sectional area of the conductor is 1·25 cm2 and weighs 100 kg per 100 m. The breaking stress is 4220 kg/cm2. Calculate the factor of...
5 Three Type B step-voltage regulators are connected in wye and located 7. on the secondary bus o...
5 Three Type B step-voltage regulators are connected in wye and located 7. on the secondary bus of a 12.47kV substation. The feeder is serving an unbalanced load. A power-flow study has been run and the voltages at the substation and the load center node are 7200/0 Vsubabc 7200/-120 V 7200/120 6890.6/-1.49 6990.5/117.05 VLCabel 6825.9/-122.90 v The currents at the substation are 362.8/-27.3 ]-395.4/-154.7 A abc 329.0/98.9 The regulator potential transformer ratio is 7200-120 and the current transformer ratio is...
THESE ARE THE QUESTIONS FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS AND THE CHAPTER IS MECHANICAL DESIGN...
THESE ARE THE QUESTIONS FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS AND THE CHAPTER IS MECHANICAL DESIGN OF TRANSMISSION LINES . THE ANSWERS ARE GIVEN WITH THE QUESTION PLEASE DO ALL THE QUESTIONS PROPERLY ..DONOT SKIP ANY STEP AND DO YOUR BEST 5. A string of 4 insulators has self-capacitance equal to 4 times the pin-to-earth capacitance. Calculate (i) the voltage distribution across various units as a percentage of total voltage across the string and (ii) string efficiency. [(i) 14·5%, 18·1%,...
Q1) Two ideal voltage sources designated as machines 1 and 2 are connected as shown in...
Q1) Two ideal voltage sources designated as machines 1 and 2 are connected as shown in Figure 1. If E! = 100.200 V, E-100し300 V and Z = 0 +JS a) Determine whether each machine is generating or consuming real power and the amount b) Determine whether each machine is receiving or supplying reactive power and the amount c) Determine the P and Q absorbed by the impedance 2 #2 Figure 1: Ideal voltage sources connected through impedance Z Q2)...
4. (20 points) The three-phase Y-connected power supply has a line-to-neutral voltage KIN of 1.220° KV....
4. (20 points) The three-phase Y-connected power supply has a line-to-neutral voltage KIN of 1.220° KV. A balanced-A load consisting of impedance Z1-20 30 Ω per phase is in parallel with a balanced-Y load having phase impedance of Z2 = 15245° Ω. Identical line impedances of Z1 = 3L15。Ω are in each of the three lines connecting the combined loads to the phase supply (a) Draw the per-phase equivalent circuit; (b) Find the line-to-line voltage Vab (magnitude and angle) at...
Problem 2 (50 points): The generator in the figure generates and delivers 150 MW to the...
Problem 2 (50 points): The generator in the figure generates and delivers 150 MW to the power system below. At steady state the generator regulates the generating station voltage (bus 1) to pu. The system voltage at bus 3 is 1.05 pu. 1. Compute the internal voltage and rotor angle of the generator under the above conditions. 2. The fault sequence for a solid three-phase fault on any of the line circuits consists of a delayed tripping of both circuit...
1. A star connected 132000/110V group of three single phase voltage transformers has burdens of 100VA...
1. A star connected 132000/110V group of three single phase voltage transformers has burdens of 100VA unity power factor across phase terminals A-B and B-C but no burden across C-A. What burdens in VA and power factor are imposed on each of the single-phase units? 2. If the units were capacitor voltage transformers on which the burdens had to be corrected to unity power factor, what value of capacitance or inductance would it be necessary to connect phase to neutral...
5 Three Type B step-voltage regulators are connected in wye and located 7. on the secondary bus of a 12.47kV substation. The feeder is serving an unbalanced load. A power-flow study has been run and the voltages at the substation and the load center node are 7200/0 Vsubabc 7200/-120 V 7200/120 6890.6/-1.49 6990.5/117.05 VLCabel 6825.9/-122.90 v The currents at the substation are 362.8/-27.3 ]-395.4/-154.7 A abc 329.0/98.9 The regulator potential transformer ratio is 7200-120 and the current transformer ratio is...
Q1) Two ideal voltage sources designated as machines 1 and 2 are connected as shown in Figure 1. If E! = 100.200 V, E-100し300 V and Z = 0 +JS a) Determine whether each machine is generating or consuming real power and the amount b) Determine whether each machine is receiving or supplying reactive power and the amount c) Determine the P and Q absorbed by the impedance 2 #2 Figure 1: Ideal voltage sources connected through impedance Z Q2)...
4. (20 points) The three-phase Y-connected power supply has a line-to-neutral voltage KIN of 1.220° KV. A balanced-A load consisting of impedance Z1-20 30 Ω per phase is in parallel with a balanced-Y load having phase impedance of Z2 = 15245° Ω. Identical line impedances of Z1 = 3L15。Ω are in each of the three lines connecting the combined loads to the phase supply (a) Draw the per-phase equivalent circuit; (b) Find the line-to-line voltage Vab (magnitude and angle) at...
Problem 2 (50 points): The generator in the figure generates and delivers 150 MW to the power system below. At steady state the generator regulates the generating station voltage (bus 1) to pu. The system voltage at bus 3 is 1.05 pu. 1. Compute the internal voltage and rotor angle of the generator under the above conditions. 2. The fault sequence for a solid three-phase fault on any of the line circuits consists of a delayed tripping of both circuit...
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