The 3-phase power and line-to-line voltage ratings of the el figure are as follows: Generator G 160 kVA 22 KV Line Transformer T 22 KV 200 kVA 22/0.5 Motor M 40 kVA 0.4 KV Vg Line G Draw the impedance diagram for this system showing all power and 22 kV base voltage at the generator side.
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- Two balanced Y-connected loads, one drawing 10 kW at 0.8 power factor lagging and the other IS kW at 0.9 power factor leading, are connected in parallel and supplied by a balanced three-phase Y-connected, 480-V source. (a) Determine the source current. (b) If the load neutrals are connected to the source neutral by a zero-ohm neutral wire through an ammeter, what will the ammeter read?In the circuit of figure shown in the next slide, threeimpedances are 12 – j10 ohms, 10 + j20 ohms, and 15 + j0ohms, connected between conductors a, b, c and the neutral“n” of a balanced 230 volts, 60 hertz, 3 phase, 4 wire, ABCsystem. Using Van as the reference vector, determine:a. Current in each impedanceb. Neutral current Inc. Readings of wattmeters W1, W2, & W3d. Power in each impedance ..Q1 Figure 1 shows the online diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedancesincluding the load impedance in per-unit. The data are given as follows: G: 100 MVA 22 kV x= 0.18 per unitT1: 60 MVA 22/220 kVT2: 40 MVA 220/11 kVT3: 40 MVA 22/110 kVT4: 40 MVA 110/11 kVM: 66.5 MVA 10.45 kVLines 1 and 2 have series reactance’s of 48.4 and 65.43 V, respectively. Atbus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.Figure 1x =0.10 per unit x = 0.06 per unitx =0.064 per unit x= 0.08 per unit x =0.185 per unit
- 3) State the relation between line and phase values of voltage and current for 3-phase STAR connected load .state the equation for active, reactive power consumed by 3-phase load.Two balanced Y-connected loads in parallel, one drawing 15 kW at 0.6 power factor lagging andthe other drawing 10 kVA at 0.8 power factor leading, are supplied by a balanced, three-phase,480-volt source.a. Draw the power triangle for each load and for the combined load.b. Determine the power factor of the combined load and state whether lagging or leading.c. Determine the magnitude of the line current from the source.A 2000 KVA, 6600/400V , Delta/Star was performed with short circuit and Open circuit test with the following results:O.C. Test : 400V, 150A and 15kwS.C. Test: 400V, 175A and 17kwDetermine the percent impedance drop for resistance, reactance and impedance. Also calculate for the efficiency at half load, 0.85pf lagging and full load, 0.8pf leading.
- Question 1:a) Three_ phase AC power is generally preferred for generation, transmissionand distribution of electrical power. Explain why alternati current isused and give the main reason for the Choice of high voltages.b) Enumerate at least four major advantages of 3-phase powercompared to three (03) single-phase systems.c) State the formula for AC power and name the four componentsContained thereinA 2000 KVA, 6600/400V , STAR/Delta was performed with short circuit and Open circuit test with the following results: O.C. Test : 400V, 150A and 15kw S.C. Test: 400V, 175A and 17kw Determine the percent impedance drop for resistance, reactance and impedance. Also calculate for the efficiency at half load, 0.80pf lagging and full load, 0.85pf leading.Question 6 a) The phase currents of a three phase power supply are defined as follows: Red phase, IR, yellow phase, IY, blue phase, IB. The associated symmetrical components with respect to the red phase are the positive phase sequence component, IR+, negative phase sequence component, IR-, zero phase sequence component, IR0. With the aid of appropriate circuit diagrams and the matrix IR0 1 1 1 IR IR+ = 1/3 1 a a2 IY IR- 1 a2 a IB deduce the following: An equation for the fault current when a single-line-to-ground fault occurs
- In the circuit of figure shown in the next slide, three impedances are 12 – j10 ohms, 10 + j20 ohms, and 15 + j0 ohms, connected between conductors a, b, c and the neutral “n” of a balanced 230 volts, 60 hertz, 3 phase, 4 wire, ABC system. Using Van as the reference vector, determine:a. Current in each impedanceb. Neutral current Inc. Readings of wattmeters W1, W2, & W3d. Power in each impedanceThree 230V single phase loads are supplied from a 400V 50Hz 3 phase 4 wire supply. The loads supplied are as follows a. 10Kw at a unity power factor connected between L1 and neutral. b. 15 kVA at 0.8 lagging power factor connected between L2 and neutral. c. 8kVA at 0.7 lagging power factor connected between L3 and neutral. Calculate a. The current in each line conductor. B. The current in the neutral conductorNon-Reactive Loads of 10kW, 20kW and 12kW are connected between the neutral and the red, yellow and blue phases respectively of 3-phase, 4 wire . The line voltage is 400. If a three phase motor is now started ,taking 150 A from the lines at a power factor of 0.3 lagging What should be the total current in each line and the neutral wire? Find the total real and reactive power supplied to the loads