The half-controlled single-phase bridge circuit shown in : below is supplied at 120 V. Neglecting volt-drops, determine the mean load voltage at firing delay angles of 0°, 60°, 90°, 135°, and 180°. If the load is highly inductive taking 25 A, determine the required device ratings. Find the pf and THD for «=90 is T, 本 Load Z D. Commutating diode Load of resistance with inductai (a)
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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.Question 1a) A network comprises of n buses. The voltage, current, active power, reactive power and admittance related to the k th bus are defined as Vk, Ik, Pk, Qk and Ykk. Deduce the following:i) Related load flow equationii) Gauss-Seidel algorithm for the load flow equationA 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
- electrical engg .fig.shows a single-line diagram of a power system where the generator is connected to the bus 1 and the load is connected to the bus 2. The line impedance is 0.12 +j 0.23 pu on a 100 MVA a base. Per unit real power and reactive power supplied to the load are 0.50 and 0.30 respectively. Bus 1 is a slack bus. Use Gauss-Seidel method to determine the (i) voltage at bus 2, (ii) slack bus real and reactive powers, (iii) line flows,TOPIC: Transmission Lines, Power Systems, and Powerplants:INSTRUCTIONS:- Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer.- Step-by-step solution, do not skip even simple calculations to avoid confusion.- If answered in written form, make sure it is readable.PROBLEM:The per-phase constants of a 345-kV, three-phase, 150-km-long transmission line are resistance = 0.112/km, inductance-1.1 mH/km, and capacitance = 0.02 uF/km. The line supplies a 180-MW load at 0.9 power factor lagging. Using the nominal-m circuit, determine the sending-end voltage in kV. 351.2 349.3 348.7 350.8Consider a DVR compensated single phase system as shown below. a) Without DVR, find the load terminal voltage (VL) if line resistance (Rs) is negligible with Xs = j0.5 pu , ZL = 0.8 + j0.5 pu and Vs= 1pu with angle equals to 0º.b) With DVR, if Vs=VL=1pu with angle equals to 0º, find the voltage Vtand the DVR voltage injected (Vf).
- Assuming the voltage at the utility bus is 13.5 kV and the PV plant supplies 4.8 MW of power at 0.95 power factor lagging. Draw the diagram of the system and determine i) the per-phase voltage and current at the POI at the PV plant ii) the reactive power delivered and that which is lost in the line. Assume the line is modelled as a short line.S.1) The serial impedance per phase of a three-phase 45 km energy transmission line is 2 + j4 / phase. A load with a power factor of cos2 = 0.8 forward is fed from the end of the line. Since the line voltage at the beginning and end of the line of the energy transmission line is wanted to be kept constant at 115 kV, a) Active and reactive powers drawn from the beginning and end of the line, b) Calculating the power consumed along the energy transmission line and the efficiency of the line. S.2) Line constants of an energy transmission line are given as A = D = 0.8746 + j0, B = 0 + j128.34, C = j0.0018316 S. At the beginning of the line, it is desired to write 1920 MW active power and 600 MVAr reactive power lines under 7650kV line voltage. According to this business, a) Calculate the line end magnitudes (U2, I2 and P2). b) What value does the end voltage take when the load fed from the end of the line is deactivated? S.3) The length of a phased energy transmission line with a…A bundled 500kv, 60Hz three phase completely transposed overhead line having three ACSR 1113kcmil(556.50mm) conductors per bundle,with 0.5m between conductors in the bundle. The horizontal phase spacings between bundle centers are 10,10,and 20m.Calculate the capacitance -to- neutral in F/m. and the admittance -to-neutral in S/km.
- a short three phase transmission line connected to 33kv 50 hertz generating station at starting and is required to supply a load of 10 MW at pointed start lagging power factor at 30 KV addresses in that is the minimum transmission efficiency is to be determined96% estimate the per face value of resistance and inductance of a lineA 210 km long three-phase transmission line is operated on a 60 Hz network. Line Finally a 40 MVA power with 0.78 back power factor under 120 kV voltage is being shot. The conductor resistance value of the line is 0.10 Ω / km, the inductance value Since 1.30 mH / km and capacitance value is 0.001 µF / km, Medium Transmission Line establishing the equivalent circuit model; a) -Calculate the line current and voltage of the sending side. b) Calculate the power loss on the line. c) Calculate the% voltage regulation value of the line.A 500 kV, 60 Hz uncompensated three-phase transmission line is 500 km long. The line has three ACSR 1113-kcmil (Finch) conductors per phase with parameters Current carrying capability of single ACSR 1113-kcmil (Finch) conductor is 1,110 A. Calculate the theoretical maximum (steady state stability limit) real power that this line can deliver and compare with the thermal limit of the line. Assume VS = VR = 1.0 per unit and unity power factor at the receiving end.