Determine the line current,neutral current and total activepower in an unbalanced starconnected load supplied from asymmetrical three-phase, 440 Vsupply system. The branchimpedance of the load are ZR= 15 300 \Omega, ZW= 20 750 \Omega and ZB= 400 500 \Omega. The phasesequence is R-W-B.

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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

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.61P

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The rated voltages of a single-phase transformer are 2000 V and 200 V in its primary and secondary respectively. The shunt impedance can be modelled with a resistance of 14000 ohms in parallel with a reactance of 1100 ohm, both refer to primary side. The primary and secondary series impedances are (0.12+j 0.35) ohms and (0.0012+j 0.0035) ohms respectively. A load is connected to the secondary side of transformer, draws 810 KVA with a lagging power factor of 0.85. The load voltage is same as rated voltage, that is 200 V. ▪ Use per unit method for analysis and find the voltage on primary side in pu.
Single phase non-ideal transformer. Turn Ratio= 3000/600. R₁ = 0.9Q R₂= 36 mQ Ro= 3000 Q X₁₁ = 0.6Q X12= 0.0024 Q X0= 6000 Q Input voltage-1440 V (also known as rms voltage) Load impedance of secondary winding is z₂= 0.12 + j0.3 Q a) Secondary winding current phasor 12 (NOT to be confused for I'₂) b) Load voltage phasor V2 (NOT to be confused for V'2) c) Primary winding current phasor ī₁ → X11 X12 R₁ R'2 www V₂ V₁ ī₁ R m ×°
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 power transformer having a line voltage ratio of 400 V to 33 kV is connected in star-delta. The C.T.s on 400 V side have current ratio as 1000/5. What must be the C.T. ratio on 33 kV side. Assume current on 400 V side of transformer to be 1000 A. C.T. secondaries in delta p 5A oooo oooo 5√3 A -0000 0000 0000 0000 Star-delta transformer 0000 5√3 A vooo னள். m reeee p C.T. secondaries in star 5√3 A 0000
Why the tranformer rattigs are mentioned in KVA. Discuss in brief.

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