a. The resistive network shown in Figure #2 is terminated in its i. Image impedance ii. Iterative impedance 10 Q ww 30 Ω ww ww 20 ww 802 www 8Q 10 Ω ww ww 20 Figure #2 Determine the power supplied to the network, under these conditions, from a 2A power source. b. Determine the Hybrid and Admittance parameters of the network in Figure #2.
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- Problem 1 - Series en Parallel AC networks [19] Look at the circuit in Figure 1 and determine the following: (a) Total Admittance. (b) Total Impedance. (c) Total Current (l:). (d) Current (I1) through impedance Z2. (e) Current (12) through impedance Z3. (f) Current (I3) through impedance Z4. (g) Is this an inductive or capacitive circuit? A. B Zs 220V;50HZ Figure 1 (h) Voltage across Z1. (i) Voltage across A and B. G) Voltage across Zs. Z1 = 3 + j5 ohm Z2 = 10 + jo ohm Z3 = 5 + j15 ohm Z4 = 10 – j30 ohm Zs = 20 – j30 ohm Admittance and Impedance in rectangular notation. All currents and voltage in polar notation. Take voltage as reference.Find the following : 1.Ripple Voltage (vpp) 2. Zero-to peak ripple(Vop) 3.secondary winding of the transformer high line and low lineAnalyse several voltage and current situations in different loading scenarios in a simplified radial (transformer to consumption) medium-voltage power system example. There are only 2 nodes in the 35 kV line – node 0 from the 110/35 kV and node 1 with one consumer. The physical characteristics of the line and the loading scenarios are individualized for each student – please see the attached file Excel “WM9P3 Task1 data” for your particular data set. Briefly reflect on the complexity of the calculations for known input or output voltage, as well as for fixed or voltage-dependent consumption in this simple power system model. Analyse and discuss the sensitivity of the voltage drop [in % of amplitude and the degrees of phase] with respect to the current level [in %] and to the power factor.
- Q4/For the three-phase power network shown in Figure. the various components are: GI: 100 MVA, 0.30 pu reactance. G2: 60 MVA, 0.18 pu reactance. Transformers (cach): 50 MVA, 0.10 pu reactance. Inductive reactor X: 0.20 pu on a base of 100 MVA. Lines (each): 80 ohms (reactive); neglect resistance. with the network initially unloaded and a line voltage of 110 kV, a symmetrical short circuit occurs at midpoint E of line 2. Calculate the short circuit MVA to be interrupted by the circuit breakers A and B at the ends of the line. T3 38 L1 L2 G2 Bas 12 T4 Bus4.a. A demountable stud bushing on high-voltage leads eliminates the need fora. an oil stop.b. a gasket.c. a terminal lug. 4.a. A power transformer with standard insulation class of 69 kv will withstand an rms test voltage ofA. 140 kv.B. 440 kv.c. 69kv.4. An Open-Wye/Open-Delta transformer, as shown in Figure, is formed by two identical single-phase transformers. The primary line-to-line voltage is 12.47 kV, and the secondary line-to-line voltage is 208 V. TakePlease and thank youThree single-phase transformers, each rated 10 MVA , 66.4/12.5 kV, 60 Hz , with an equivalent series reactance of 0.1 per unit divided equally between primary and secondary, are connected in a three-phase bank. The high-voltage windings are Y-connected and their terminals are directly connected to a 115-kV three-phase bus. The secondary terminals are all shorted together. Find the currents entering the high-voltage terminals and leaving the low-voltage terminals if the low-voltage windings are (a) Y-connected and (b) Δ- connected.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° Ω400Ω A k=0.9 600Ω B k=0.8 66Ω 600ΩI need the answer at 20 minuteConsider three ideal single-phase transformers (with a voltage gain of ) put together as three-phase bank as shown in Figure 3.35. Assuming positive-sequence voltages for Va,Vb, and Vc find Va,Vb, and VC. in terms of Va,Vb, and Vc, respectively. (a) Would such relationships hold for the line voltages as well? (b) Looking into the current relationships, express IaIb and Ic in terms of IaIb and Ic respectively. (C) Let S and S be the per-phase complex power output and input. respectively. Find S in terms of S.SEE MORE QUESTIONS