Balanced A-connected load (1525°Q/ph), is connected with another load balanced Y-connected (10445°O/ph), to 3-ph, 3-wire, A-connected, positive sequence (abc), 208V line voltage. Compute: 1. Total line currents. (Ans.: A=35,5Z-31.6°A, I=35.54-151.6°A, Ic=35.5Z88.4°A & 0.85lag) 2. Total power factor.
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- Determine the current in the neutral conductor and the current in each line conductor (i.e., IR, IB and IY) using the given information below. The powers 12 kW, 18 kW and 24 kW are the loads of a purely resistive loads which are between the yellow and blue, the red, and neutral phases respectively of a 3-Φ, four-wire system.415 V is the line voltage.A single phase transmission line is delivering 470 kVA load at 12 kV. Its resistance is 6 Ω and inductive reactance is 6 Ω if the load power factor is 0.7 lagging. Determine the 1- Current through the line? 2- Sending end voltage? 3- Sending end power factor? 4- Regulation of transmission line? 5-Efficiency of transmission line?The line-to-line voltages of a three-phase, four-wire system are the following: Van = |Van| cis(-25); Vbn = |Vbn| cis(-120); and Vcn = |Vcn| cis(90) volts. Where: |Van| = (5/2) |Vcn|; |Vbn| = (5/3) |Vcn|. If |Vcn| = 437 volts, what is the magnitude of the positive sequence component of Vab in volts?
- Determine the current in the neutral conductor and the current in each line conductor (i.e., IR, IB andIY) using the given information below. The powers 12 kW, 18 kW and 24 kW are the loads of a purely resistive loads which are between the yellow and blue, the red, and neutral phases respectively of a 3-Φ, four-wire system.415 V is the line voltage. Find the active power (in kW) in the main network and in. each branch and the apparent power (in kV A) using the given information below. Two branches connected in parallel had a p.d. of 200∠30° V applied to them. The currents in the respective branches are 20∠60° A and 40∠30° A. Thanksestimate the distance over which the load of 15000 KW at 0.85 power factor can be delivered by a three phase transmission line having conductors of Steel coated aluminium each of resistance 0.905 ohm per face per kilometre the voltage of the receiving end is to be 132 KV and the losses in transmission is to be 7.5 % of a loadTOPIC: 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:For a three-phase long transmission line, Zc = 406.4 cis -5.48 ohms, VR = 215 KV, and IR = 335.7 A, all per phase. Calculate the sending end-line voltage in kV. 238.8 227.4 234.6 229.1
- A short 3-phase transmission line connected to a 33kV, 50 Hz generatingstation at the sending end is required to supply a load of 10 MW at 0·8lagging power factor at 30 kV at the receiving end. If the minimumtransmission efficiency is to be limited to 96%, estimate the per phasevalue of resistance and inductance of the line.pwede pa po pa-post? adv payment @idckath A 3-phase, 3-wire, short transmission line has a resistance of 3 ohms and a reactance of 8 ohms per wire. At the receiving end, a balanced 3-phase load draws a line current of 60 A, at 13,500 volts line to line, 0.90 power factor lagging. Determine the voltage at the sending end.a) Discus why the transmission systems are mostly overhead systems. b) Discuss why all overhead lines use ACSR conductors. c) Discuss why at 400 kV and above the transmission lines have bundled conductors. d) How do the various devices protect the penstock? e) Discuss why the transmission lines are 3 phase 3 wire circuits while secondary distribution lines are 3 phase 4 wire circuits. f) At which places the diesel power stations are finding favor? Why? g) How do voids in the insulation cause breakdown of the cable? h) What is the function of condenser in steam power plant?
- 1. What are the applications for stripline and microstrip transmission lines? 2. Give 2 examples of characteristic impedance application for each stripline and microstrip transmission lines.In a 380 kV three-phase transmission system, the diameter of the overhead lines in the form of cylinder conductors is 28 mm. a) How much distance should there be between two conductors using the maximum area calculation equations? Calculate. (Puncture peak strength of air is 30kV / cm.) b) In this configuration, if the distance between phase conductors is 4 m, at what voltage level Calculate the discharge occurs? c) Maximum electric field in the same configuration, for electrode distances to be 8 m Calculate the value. If needed in calculations Ꜫ0 = 8.854x10-12 F / mGiven a 400sq.m single family dwelling unit to be provided with 230V, 1-phase, 2-wire service, and having the following loads: 2-1.5hp A/C, 2-1.0hp A/C, 1-0.5hp water pump, 4-800W water heater, 2-6kW electric range and 2-1kW microwave oven, determine the rating of feeder overcurrent protection in ampere-trip (AT) using inverse time circuit breaker. Write your answer in numerical format without decimal places.