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. 2. Mi P₂² = 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)
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- Let a series RLC network be connected to a source voltage V, drawing a current I. (a) In terms of the load impedance Z=ZZ, find expressions for P and Q, from complex power considerations. (b) Express p(t) in terms of P and Q, by choosing i(t)=2Icost. (c) For the case of Z=R+jL+1/jC, interpret the result of part (b) in terms of P,QL, and Qc. In particular, if 2LC=1, when the inductive and capacitive reactances cancel, comment on what happens.Which termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformer5.5 kW, 1450 rpm. L-type equivalent circuit and parameters for a continuous sinusoidal phase of a star connected 3-phase ASM with line voltage 220 V and frequency 50 Hz are given as follows, ignoring core (iron) losses: R1=0.21 Ohm, R2=-0.18 Ohm, X1=X2-0.66 Ohm and Xm = 9.9 Ohm How many times the inrush current will be the rated current when the ASM is started directly? Answer options group 8.0815 2.6455 4.3763 7.1534 1.2558 6.3414 5.2280 3.7473
- The sending-end voltage in the circuit seen is adjusted so that the load voltage is always 13,800 V(rms). The variable capacitor is adjusted until the average power dissipated in the line resistance is minimum. 1. a) If the frequency of the sinusoidal source is 60 Hz, what is thevalue of the capacitance in microfarads?2. b) If the capacitor is removed from the circuit, what percentageincrease in the magnitude of Vs is necessary to maintain 13,800V(rms) at the load?3. c) If the capacitor is removed from the circuit, what is thepercentage increase in line loss?A lightning strikes a 30-m unshielded over-head transmission line tower Which has the following parameters Surge impedance of the tower= 100ohms Surge impedance of lightning channel at tower top =500ohms Tower-footing resistance=10ohms Tower height =30 m Cross-arm height=27m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 µs. The raveling wave propagation speed in the tower is 1.2* 108 m/s. i) Determine the voltage reflection coefficients at tower top and tower foot. ii) Ignoring the phase voltage, determine the insulator voltage after 2µs.A lightning strikes a 30-m unshielded over-head transmission line tower Which has the following parameters Surge impedance of the tower= 100ohms Surge impedance of lightning channel at tower top =500ohms Tower-footing resistance=10ohms Tower height =30 m Cross-arm height=27m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 µs. The raveling wave propagation speed in the tower is 1.2* 108 m/s. i) Determine the voltage reflection coefficients at tower top and tower foot. ii) Determine the time of travel from tower top to tower foot. iii) Determine the time of travel from cross arm to tower foot. iv) Draw the voltage lattice diagram with proper labels of the time. v) Ignoring the phase voltage, determine the insulator voltage after 2µs. b) The insulator voltage approaches a constant value after 2 µs. If the basic impulse insulation level (BlL) of the insulator for phase conductor is 150 kV, evaluate the condition of the…
- An energy transmission line with a length of 130 km transmits 150MVA of power at 380 kV voltage. The conductors used have a conductivity of 35 [m / mm mm²] and a diameter of 28.11mm. The final temperature reached by this transmission line is 66 degrees. (NOTE = temperature coefficient of conductor a20deg = 0.00403deg ^ -1) Approximately how many kWatts is the total loss in the three-phase line at 20 degrees?The resistance and reactance of the single-phase 60Hz transmission line conductors are 7.6 ohm and 6.6 ohm respectively. The transmission line delivers 20MW at a power factor of 0.66 lagging to the load with 54kV receiving end voltage. Determine the following a) The inductance of the transmission line in mH b) Sending end power factor c) Percentage voltage regulation d) Percentage EfficiencyThe impedance of the 500 km long transmission line is Z = 0.1 + j * 0.4 ohm / km. At the end of the line, 988.1 A current is drawn under 400 kV interphase voltage. The angle of the current is -68. It is 6 degrees. With the short transmission line equations, the amplitude value of the phase neutral value of the busbar voltage to which the generator at the beginning of the line is connected is given correctly. A) 231.34 B) 52.35 C) 400 D) 380.28 E) 388.57
- A 30 mile, 3-phase transmission line delivers 8,000 kW at 33 kV, p.f. 0.8 lagging. The resistance and reactance of single conductor are 0.6 ohm and 0.72 ohm respectively per mile. Find the voltage at the sending end in kV.A 3-phase line 30 km long delivers 3000 kW at 33 kV, 50 Hz and p.f. 0.8 lagging. The resistance and inductance of each conductor are 0.2 ohm and 1.15 mH respectively. Calculate the percent voltage regulation.A 3-ph, 60 Hz, 200 km long, 220 kV transmission line has per km per phase constants of resistance 0.033 Ω, inductive reactance 0.33 Ω, capacitive susceptance 3.3x10 -6 mho. The load at the receiving end of the line is 500 MW at 0.95 power factor leading and voltage has dropped to 209 kV. Using the PI model, calculate the voltage, current and power factor at the sending end. Please answer in typing format solution please only typing format Please I will like it please reply to