Basic Engineering Circuit Analysis
11th Edition
ISBN: 9781118539293
Author: J. David Irwin, R. Mark Nelms
Publisher: WILEY
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A balanced 3-phase, delta-connected load is connected across a 208 V, balanced 3-phase, ABC source. If it dissipates 10 KW at 60% p.f. lagging, its impedance (polar form) per phase is?
A balance 3-phase, inductive delta-connected load is connected to a balance 3-phase, 100V, abc source. Two-wattmeter method is used to determine the total power of this delta load. If wattmeter 1 (W1) and wattmeter 2 (W2) are connected in lines a and b respectively and reads 836.492 watts and 224.140 watts respectively, the line current, Ib is?
In a balanced abc sequential, three-phase star-star connected system, the total power on the line is 650W. If VAN117/15 degrees Vrms, the load's power factor is 0.88(forward) and the line impedance is 1+j2ohm, what is the load impedance value?
a)5+j1.78ohm
b) 5-j1.78ohm
c) 7-j3.08ohm
d) 7+j3.78ohm
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- A three-phase line with an impedance of (0.2+j1.0)/ phase feeds three balanced three-phase loads connected in parallel. Load 1: Absorbs a total of 150 kW and 120 kvar. Load 2: Delta connected with an impedance of (150j48)/phase. Load 3: 120 kVA at 0.6 PF leading. If the line-to-neutral voltage at the load end of the line is 2000 v (rms), determine the magnitude of the line-to-line voltage at the source end of the line.arrow_forwardA star-connected three-phase balanced power system A transmission line with line impedance Zh It feeds an unbalanced three-phase delta load. Regarding line and load impedances values are given. Zh=2+j, Z1=40+j20, Z2=50-j30 and Z3=25 Accordingly; a)- Calculate IAB and IAC phase currents. b)- Calculate the line currents IAave IBb.arrow_forwardIn a balanced 3-phase system, the effective value of the IbB current for a triangular connected load is known as 15 (-150 degrees) Amperes and the effective value of the VCA voltage is known as 60 (90 degrees) Volts. Since it is known that the phase sequence is positive; Phase current IAB= 8.660 (60 degrees) A Phase current IAC= [Select ] Load impedance Z= [Select ] the total average power sent to the 3 phase load is Pt Aggregate= [Select ] (Note: Perform your operations using at least 3 digits after the comma.)arrow_forward
- NOTE: YOU MUST USE THE STANDARD PHASE DIAGRAMTO A THREE-PHASE SYSTEM WITH LINE VOLTAGE OF 230 VAC 60 HZ, A BALANCED LOAD OF 9+j6 Ω IS CONNECTED.IF THE LOAD IS CONNECTED IN DELTA, DETERMINE:A) THE MAGNITUDE OF THE CURRENT OF Ia.B) THE ANGLE OF THE LINE CURRENT Ia.C) THE THREE-PHASE POWER CONSUMEDD) THE VALUE OF EACH CAPACITOR (IN μF) OF THE STAR-CONNECTED CAPACITOR BANK, TO CORRECT THE PF TO ONE.arrow_forwardA balanced delta-connected lood with impedance per phase of 30<30 ohms is connected to an abc-sequence balanced three-phase source with eAC = -120√2 cos (120πt + π/6) V through conductors with negligible impedances. Determine the line currents, load phase currents and the total complex power drawn by the lood. Write your values in polar form.arrow_forwardA three-phase Δ-connected generator has an internal impedance of 9+j90 m Ω/ϕ. When the load is removed from the generator, the magnitude of the terminal voltage is 13,800 V. The generator feeds a Δconnected load through a transmission line with an impedance of 20+j180 m Ω/ϕ. The per-phase impedance of the load is 7.056+j3.417 Ω. Construct a single-phase equivalent circuit.arrow_forward
- Three identical impedances of 10∠ − 15° Ω to a line voltage of 208 V in star connectedconnected to a balanced source. We accept all line and phase voltages and currents as Vca as reference.Calculate in the form (Assume positive order).arrow_forwardIn a balanced abc sequential three-phase star-star connected system, the total power on the line is 650W. If the VAN is 117/15 degrees Vrms, the load has a power factor of 0.88 (forward) and the line impedance is 1 + j2ohm, what is the load impedance?arrow_forwardA Y-Y three-phase system has a source of 380 V and a load of impedance of 6+j5 Ohm/phase through a transmission line of 2+j 1 Ohm/phase.Plot this Y-Y three-phase system then calculate complex power supplied by the source.arrow_forward
- 8) If Vab = 221 Vrms in a balanced Y-connected three-phase generator, find the magnitude of the phase-a voltage (in Vrms), assuming the phase sequence is acb.arrow_forwardlow voltage systems In the circuit given below, single-phase powers connected to the single-phase network are given. If the effective value of the applied voltage is 220 V, the amplitude of the current drawn from the network(I) how many A?(Note: - sign indicates phasor state) A)142,85 B)119,34 C)129,16 D)137,86arrow_forwardA particular balanced three-phase system is supplying a (delta)-connected load with 10kW at a leading power factor of 0.7. If the phase voltage is 208V and the source operates at 50Hz answer the following: (a) compute the line current (b) compute the impedance Zp (c) draw a circuit diagram representing this system.arrow_forward
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