Calculate the following: a) Total apparent power delivered by the source, ST b) Line currents la, lb c use Vab=13.8kV as reference phasor Assume source is connected in delta.
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- The circuit shows an unbalanced electrical installation powered by a positive sequence symmetrical three- phase network of 380 V compound voltage. The loads are single phase. Load 1 absorbs an active power of 950 W with f.d.p. 0.5 inductive. Load 2 absorbs an active power of 1,140 W with f.d.p. Unit. Load 3 absorbs from the network an active power of 760 W with f.d.p. 0.5 capacitive. Taking the network voltage URN as the phase reference, calculate: a) complex expressions of the line currents IR. Is. and IT RO- SO TO IR Is IT U₁-380 V CARGA 1 P₁ =950 W cos p1=0,5 ind. CARGA 2 P₂=1.140 W cos p₂=1 CARGA 3 P3=760 W cos p3=0,5 cap.The circuit shows an unbalanced electrical installation powered by a positive sequence symmetrical three-phase network of 380 V compound voltage. The loads are single phase. Load 1 absorbs an active power of 950 W with f.d.p. 0.5 inductive. Load 2 absorbs an active power of 1,140 W with f.d.p. Unit. Load 3 absorbs from the network an active power of 760 W with f.d.p. 0.5 capacitive. Taking the network voltage URN as the phase reference, calculate: a) complex expressions of the line currents IR. Is. and IT2. Two transformes A and B of ratings 5uokVA and 25okVA. Supplying a load kVA of 750 ato.8Pf lagging. open circunt valtajes are 400V and 410v respectively. Trusfarmn A has 1/ nsistance and 5/ ractance and traugformer B hay 1.$, mesistona and 41 reactance. Find (^) Crossacarent in the seandaries on no.load.ib) the load shared by euch transfarmer Their are
- 15) Kirchhoff's Voltage Law (KVL) states that A) the product of the phasor voltages around any closed path must equal zero. B) the sum of the phasor voltages around any closed path does not have to equal zero. C) the sum of the phasor voltages around any closed path must equal zero. D) the sum of the phasor voltages around a closed path cannot include "through the air."The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsabout Three-phase Circuits
- An 11 kV generating station has four identical 3-phase alternatorsGl, G2, G3 and G4 each of L0 MVA capacity and l2%o reaclarce.There are two section of bus-bar P and Q, linked by a reactor X ratedat 10 MVA with 24o/oreactance. From section Q load is taken througha 6 MVA, i 1kV/66kV step-up transformer (T1) having a reactance of37o. Determine the fault current if a three-phase short-circuit occursnear the high voltage terminal of the transformer (F) as shown inFigure.Assume prefault voltages to be 1 pu and prefault currents to be zeroThe terminal voltage for cases where the cosQ value is reverse, forward and 1, respectively, ignoring the resistance value of the generator draw phasor diagramsX₂=0.1 1 XL +03 Soto X₁ = 0.2 X = 0.1 X = 0.1 Above is the one-line diagram of a simple power system. Each generator is represented by an emf behind the subtransient reactance. All impedances are expressed in per unit on a common base. All resistances and shunt capacitance are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. A symmetrical fault occurs at bus 1 through a fault impedance Z, =j0.08 per unit. a) Using Thevenin's Theorem, determine the impedance to the point of fault and the fault current in per unit. b) Find the bus voltages and line currents during the fault. 2 O oto
- Please answer this problem Determine the Resistance Value and reactance of the rotal impedanceTwo impedances consist of resistance of (15 ohms and series connectedinductance of 0.04 henry) and (resistance of 10 ohms, inductance of 0.1 henryand a capacitance of 100 microfarad, all in series) are connected in series andare connected to 230 volts, 50 – Hz AC source. Find: (a) current drawn, (b) voltageacross each impedance, (c) individual and total power factor. Draw the phasordiagram.1) Referring to the circuit as in Figure 1, transform the circuit in phasor domain representation.2) Determine the value of total impedance, ZT3) Determine the value of total current, IT4) Determine the value of branch current, I1 and I25) Determine the value of voltage across resistor, R1, R2 and R36) Determine the value of voltage across capacitor, C1 and C27) Determine the value of voltage across inductor, L.