Q1. Mention the advantages of a three-phase over a single-phase power system.
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Fundamentals Of Energy Systems THQ1 Q1
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- Consider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it toHow does a three-phase power system differ from a single-phase power system, and what are their respective applications?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 Bus
- 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.A three-phase alternator connected in delta of 100 KVA and 635 volts is tested for OCC, SCC and winding resistance, giving the following data: Based on the above data, obtain: a) - Equivalent circuit per phase of the alternator b) - Voltage regulation when operating at full load and feeding a load with power factor of 0.8 inductive. c) - Voltage regulation when operating at full load and feeding a load with unity power factor. d) - Voltage regulation when operating at full load and feeding a load with a power factor of 0.8 capacitive.1. A single-phase power system as shown in Figure 1 consists of a 240 V, 60 Hz generator supplying a load, Zod = 8 + j6 Q through a transmission line of impedance, Zne = 0.08 + j0.14 Q. Answer the following questions: (1) transformer, T; and T2. Determine the voltage at the load and transmission line losses without the (ii) Determine the voltage at the load and transmission line losses with the transformer, T, and T2. T1 T2 1:10 10:1 IG Zaine Zioad source Figure 1
- - Define the parts and functions of AC Generator - Define the working principle of AC Generator. - Define WYE and DELTA connection in AC Generator.Please answer in typing format solution32. The incremental cost characteristics of two generators delivering a load of 200 MW are as follows: dF = 2.0 + 0.01 P, dP, dP dF, -= 1.6 + 0.02 P, For economic operation the generators P, and P, should be (a) 120 MW and 80 MW (b) 81 MW and 120 MW (c) 120 MW and 120 MW (d) 80 MW and 80 MW
- 6- a. b..In a single-phase alternator, a given field current produces an armature current of 250 A on short-circuit and a generated e.m.f. of 1500 V on open-circuit. Calculate the terminal p.d. when a load of 250 A at 6.6 kV and 0.8 p.f. lagging is switched off. Calculate also the regulation of the alternator at the given load. [7,898 V; 19.7%] (Elect. Machines-II, Indore Univ. Dec. 1977) A 500-V, 50-kVA, single-phase alternator has an effective resistance of 0.2 N. A field current of 10 A produces an armature current of 200 A on short-circuit and e.m.f. of 450 V on open circuit. Calculate (a) the synchronous impedance and reactance and (b) the full-load regulation with 0.8 p.f. lagging. [(a) 2.25 N, 2.24 2, (b) 34.4%] (Elect. Technology, Mysore Univ. 1979)A three phase star connected alternator of 1000 KVA, and 4600 volts, has an armature resistance of 2 ohms per phase and an armature synchronous reactance of 20 ohms per phase. Find the voltage generated at full load per phase if : a) Supplies power to a purely resistive load b) If you feed a load with inductive power factor of 0.85 c) If you feed a load with a capacitive power factor of 0.75 d) If you feed a load with capacitive power factor 0.4