Which of the following will be the per-phase load impedance for a Y-connected load, if a three-phase balanced source of 220 V supplying a balanced three phase load? The measured line current I of 15 A is in phase with the voltage 3c (line to line voltage). (a) 8.5/90° Q (b) 12.5290° Q (c) 8.52-90° 2 (d) 12.5 -90° N Answer D Subinit arch

Which of the following will be the per-phase load impedance for a Y-connected load, if a three-phase balanced source of 220 V supplying a balanced three phase load? The measured line current I of 15 A is in phase with the voltage 3c (line to line voltage). (a) 8.5/90° Q (b) 12.5290° Q (c) 8.52-90° 2 (d) 12.5 -90° N Answer D Subinit arch

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.24MCQ: Consider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line...

See similar textbooks

Similar questions

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.
Consider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line currents as well as the neutral current are always zero. (a) True (b) False
It is stated that (i) balanced three-phase circuits can be solved in per unit on a per-phase basis after converting - load impedances to equivalent Y impedances. (ii) Base values can be selected either on a per-phase basis or on a three-phase basis. (a) Both statements are true. (b) Neither is true. (c) Only one of the above is true.
A single-phase source is applied to a two-terminal, passive circuit with equivalent impedance Z=3.045, measured from the terminals. The source current is i(t)=22cos(t)kA. Determine the (a) instantaneous power, (b) real power, (c) reactive power delivered by the source, and (d) source power factor.
In a balanced system, the phasor sum of the line-to-line voltages and the phasor sum of the line-to-neutral voltages are always equal to zero. (a) False (b) True
l. A single-phase distributor AB has a total impedance 0f (0.1+j0.2) ohms. At the far end B, a current of 80A at 0.8 pf lagging and at mid-point C a current of 100A at 0.6 pf lagging are tapped. If the voltage at B is maintained at 200V, determine the sending end voltage.
1. A 3-phase line having an impedance of (5 + j 20) ohms per phase delivers a load of 30 MW at a p.f. of0·8 lagging and voltage 33 kV. Determine the capacity of the synchronous condenser required to beinstalled at the receiving end if voltage at the sending end is to be maintained at 33 kV. solution is [42·78 MVAR]
A three-phase transmission line has an impedance of 2 + j8 Ω per phase. The linesupplies the following two three-phase loads:Load 1: 600 KVA at 0.8 power factor lagging.Load 2: 300 KVA at 0.9 power factor lagging.The phase voltage at the loads is Vr = 2000∟0◦ volts.Determine:a) The phase voltage at the sending end (Vs).b) Three-phase real and reactive power losses in the transmission line.c) Three-phase real and reactive power supplied at the sending end.
1. A three-phase star source supplies a balanced three-phase load in a delta configuration. Knowing that the phase voltages are Van = 120∠30 ° and Vcn = 120∠-90 °, determine Vbn and indicate the type of sequence in which the three-phase source works. Also, knowing that the three-phase impedance is Z = (2 + j) Ω, determine the line voltage and the line current of each passive element.
In regards to the Sequence Networks of Impedance Loads, If the the positive sequence V1 = 1.03 angle(-8), the negative sequence voltage V2 = 0.03 angle(-34), and the zero sequence voltage Vo = 0, what is the a - phase voltage Va? a. 1.05 angle(-8.7) b. 1.00 angle(-7.2) c. 1.01 angle (-9.0) c.
A balanced, three-phase circuit is characterized as follows: Y-Δ connected; Source voltage in the b-phase is 150 135 ∘ V; Source phase sequence is acb; Line impedance is 2+j3 Ω/ϕ; Load impedance is 129+j171 Ω/ϕ. 1. a) Draw the single phase equivalent for the a-phase. 2. b) Calculate the a-phase line current. 3. c) Calculate the a-phase line voltage for the three-phase load.
A three phase, 60 Hz, 60 km long transmission line has series impedanceZ=0.1+ j 0.5Ω/ km delivers 40 MVA at 48 kV to a load at its receiving end at 0.9 power factor leading. Find the following1. ABCD parameters2. Sending end voltage and current3. Sending real and reactive power 4. Power factor at sending end5. Voltage regulation6. Efficiency PLEASE EXPLAIN THE PHASOR MULTIPLICATION. THANK YOU