= 4. Consider a three-phase positive sequence power system with a Y-connected generator (VA 120V 20°), series branch impedance Zbrj0.102, neutral circuit impedance ZN = 0.3+j0.030, Y-connected load impedance Z₁ =j502, and A-connected load impedance Z₂ = −jan. N (a) Determine v₁ (t). Zbr ZN A' Z₁ N' B' 22 1/2 B'
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- Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Ztoad 500 236.87° ohm , and the transmission line's impedance is Zine = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Zload = 500 236.87° ohm, and the transmission line's impedance is Zline = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.TWO transformers A and B are connected in parallel to a load of (2+j1.5) ohm. Their impedances in secondary terms are Za = (0.15+j0.8) ohm amd Zb = (0.1+j0.6)ohm, thier no load terminal voltage are Ea = 200 (angle 0 degree) and Eb = 210(angle 0 degree). Find the power output and power factor of each transformer
- Two single-phase transformers whose phase electrical equivalent circuits are given below are connected in parallel and ZL= 0.8+j0.6ohm is feeding a worth of load. Idle operating voltage of Transformer 1 is 220 V and Transformer 2 idle operating voltage is 240V. a.) Find the currents flowing from transformers to the load. b.) Find the active powers that transformers transfer to the load.Two single-phase transformers whose phase electrical equivalent circuits are given below are connected in parallel and ZL= 0.8+j0.6ohm is feeding a worth of load. Idle operating voltage of Transformer 1 is 220 V and Transformer 2 idle operating voltage is 240V.a.) Find the currents flowing from transformers to the load.b.) Find the active powers that transformers transfer to the load.Two single-phase transformers whose phase electrical equivalent circuits are given below are connected in parallel and ZL= 0.8+j0.6 ohm is feeding a worth of load. Idle operating voltage of Transformer 1 is 220 V and Transformer 2 idle operating voltage is 240V. a.) Find the currents flowing from transformers to the load. b.) Find the active powers that transformers transfer to the load.
- A single-phase power system is shown as the equivalent circuit below. The system has a 480V generator connected to an ideal 1:10 step-up transformer (no losses), a transmission line, an ideal 20:1 step-down transformer and a load all in series as shown. The resistance of the transmission line is 20 S2 and the reactance j60 , a load is connected to the system with an impedance of 10/30° №. For the analysis of the system, use base values of 10 kVA and 480 V at the generator, find (a) per unit values of all impedances, (b) per unit current, (c) load power (W), (d) power loss (W). NG 480 20⁰ V 10 kVA Zone 1 1:10 20 Ω j60 Ω ZL Zone 2 20:1 ILoad Zone 3 ZLoad 10/30° Ωtwo generators supplying a load. Generator I has a no-load frequency of 62.5 Hz and a slope Sp1 of I MW/Hz. Generator 2 has a no-load frequency of 62.0 Hz and a slope sp2 of I MW/Hz. The two generators are supplying a real load totaling 2.5 MW at 0.8 PF lagging. (a) At what frequency is this system operating, and how much power is supplied by each of the two generators? (b) Suppose an additional I-MW load were attached to this power system. What would the new system frequency be, and how much power would Gl and G2 supply now? Generator 1 VT V2 Generator 2 VTí KVAR KVAR21. The total power drawn by two-impedance load in parallel is 15kW at 85% power factor lagging, it's being supplied by 230- volts AC source. One of the loads (Load 1) takes 11KVA at 90% power factor leading. a. What is the real power, reactive power, and the apparent power of the unknown impedance (Load 2)? b. Find the resistance and the reactance of the other impedance load (Load 2). c. Determine the currents on each branch and the total current
- Shown are two buses connected via a transmission line. Connected to Bus 1 is a generator(modelled as a voltage source V1), and to Bus 2 is a generator( with Voltage V2) and a load. The line impedance Z = R + jX is not known. Three-phase load is forecasted as 100MW + 60MVar. Generator at Bus 2 is scheduled to deliver 40MW and its excitation is adjusted for the machine to deliver 55 MVar. Voltage at Bus 1 is 241 KV angle 10 deg, while voltage at bus is 230 kV; use V2 as the reference for all angles. 1. What is the current (RMS) in amperes drawn by the load connected to Bus 2? 2. How much real power (in MW) is delivered by the generator connected to Bus 1? 3. What is the total real power loss along the line, in percent of the load? 4. What is the X/R Ratio of the line impedance?1 Two transformers A and B are connected in parallel to a load of (2+j1.5)2. Their impedances in secondary terms are ZA = (0.15 + j0.5)2 and ZB= (0.1 +j 0.6)2. Their no-load terminal voltage are EA 207 /0° volt and EB = 205/0° volt. Find the power output and power factor of each transformer.Two single phase generators operating in parallel have no-loads emfs of E1 = 240∠0° V and E2 =240∠10° V and respective synchronous reactance of XS1 = j2.5 ohms and XS2 = j3.1 ohms. Resistances are neglected. The common load is purely resistance of 10 ohms. Find the common terminal voltage in volts.