Is it possible for a 4-wire Delta system to be balanced withing 10% when serving a large quantity of single-phase 120V loads (line to neutral)
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Is it possible for a 4-wire Delta system to be balanced withing 10% when serving a large quantity of single-phase 120V loads (line to neutral)
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- 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.5. Bus-bars are operated at a) Constant voltage b) Variable voltage c) Depend upon requirement d) None of the above 6. One of the following represents the leading power factor: a) Capacitive Load b) Inductive Load c) Resistive Load d) RL Lo.H.W 6: For the systom shown, determeine the fauttt level and short cerint current for a 3-phase fault at the of The linee. middle ofone のC) Vo.2 P.u t02p.u ikV 132 ICV =110 p.u 132KV Assume all reactances of generatos and transfe ona 10% u kV at aen's. on common base, Sb- 50 MVA,
- One advantages of load balancing is that each phase conductor carries the ? current valueProblem 3.5: From a 3-phase, 480 V generator switchboard, a feeder takes 3-phase power to two equipment at the other end via cable and trans- former with the combined series impedance Z = 0.04 + j 0.09 N per phase. The voltage at receiving end point A rises and falls as a large 3-phase, 500 kVA load at point A varies over time. The small 1 kVA load, also connected at point A, remains online continuously, and must accommodate the voltage variations at point A with the 500 kVA load fully on or fully off. Determine the voltage range that the 1 kVA load will see, over which it must perform within its specifications.Two power system areas operating at a nominal frequency of 60 Hz are connected with a tie line, and have the following characteristics: Area 1: R1 = 0.02 pu and D1 = 1 pu on a base of 1200 MVA Area 2: R2 = 0.03 pu and D2 = 0.8 pu on a base of 700 MVA The power flow direction on the tie line is from Area 1 to Area 2. Using a common base of 1000 MVA, what is the change in tie flow (in MW) for a load increase of 200 MW in Area 1? Select one: a.-56.16 MW O b. None of these O c.-143.84 MW O d.-38.02 MW <
- Current does not flow in the neutral wire in symmetrical 3-phase system a. True O b. FalseThree unequal single-phase loads are connected across the lines of a balanced, 3-phase, 230 volts (line) circuit. The first load takes 106 A at 0.78 pf lagging and is connected across lines 1 & 2. The second load takes 142 A, at 0.82 pf lagging and is connected across 2 & 3. The third one takes a load of 28.4 kW at 0.77 pf lagging. Solve for the following a. The line currentsb. The equivalent wye connected impedance of the connectionc. The total complex power absorbed by the loadThree unequal single-phase loads are connected across the lines of a balanced, 3- phase, 230 volts (line) circuit. The first load takes 106 A at 0.78 pf lagging and is connected across lines 1 & 2. The second load takes 142 A, at 0.82 pf lagging and is connected across 2 & 3. The third one takes a load of 28.4 kW at 0.77 pf lagging. Solve for the following a. The line currents b.The equivalent wye connected impedance of the connection c. The total complex power absorbed by the load
- e = 0 Q1: What does happen if we change two currents? a. Q2: What does happen if we have a three-phase four poles machine? Q3: What does happen if we have a two-phase two poles machine? e = 0 Q4: What does happen if we apply a capacitance in phase b and then use same voltage for both phase. Dr. Ali Ki. pw --Three unequal single-phase loads are connected across the lines of a balanced, 3-phase, 230 volts (line) circuit. The first load takes 106 A at 0.78 pf lagging and is connected across lines 1 & 2. The second load takes 142 A, at 0.82 pf lagging and is connected across 2 & 3. The third one takes a load of 28.4 kW at 0.77 pf lagging. Solve for the following The line currents The equivalent wye connected impedance of the connection The total complex power absorbed by the loadii) 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
