PART 1 - BALANCED AND UNBALANCED THREE-PHASE SYSTEMSTask 1.11. Build the Balanced Three-Phase Y-Y system using MATLAB Simulink as shown in figure 1.12. Select 230Vrms of each phase (R-Y-B), 50Hz3. Select the load is R₁ = Rb = Rc = 40 W; La Lb Le = 0.01 H, and C₁ = C₁ = Cc = 100μF;4. Observe and plot the active and reactive powers and power factor.5. Increase the L₁ = L₁ = L = 0.1 H, observe the reactive power and power factor, and comment on it.Formula:Power factorPSContinuousContinuousPowerMeasurementRMSQUERMSRMS2AVabclabcBC°RMSFigure 1.1 Balanced three-phase circuit with star-connected load.ContinuousPower Measurement(Three-Phase)••

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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

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.13MCQ

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Impedances Z2 and Z3 in parallel are in series with impedance Z1 across a 100 V, 50 Hz ac supply. Z1 =6.25 + j1.25 ohm; Z2 = 5+ j0 ohm and Z3 = 5-jXc ohm. Determine the value of capacitance of Xc such that the total curent of the circuit will be in phase with the total voltage. When is then the circuit current and power.
Driving-point admittance The actual impedance of a load is 30 OHM. The per-unit impedance of the load is 0.5 pu when Base Voltage is 600 V and Base Power is of O 6000 VA O 8000 VA O2000 VA 4000 VA Jump to ncements MacBook Air DD DII F10 F9 F8 000 F7 F6
Two impedances Z₁ and Z2 are connected in series to a voltage source with voltage Vs volts. Let V₁ be the voltage across Z₁ and V₂ be the voltage across Z2. Then, the total voltage Vs is divided between V₁ and V2 in proportion to impedance values Z₁ and Z2. O a. True O b. False
(b) A symmetrical delta-connected 415V three-phase supply is feed to an asymmetrical delta- connected load as shown in Figure Q2(b). Assume that it is a RYB sequence. The impedances of the load are ZRY = 50 +j50 Q , ZYB = 150 + j0 Q and ZBR= 50 – j50 N. (i) Determine and draw the phasor diagram of phase currents in the load. (ii) Determine and draw the phasor diagram of line currents in the system.
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Impedances Z2 and Z3 in parallel are in series with impedance Z1 across a 100 V, 50 Hz acsupply. Z1 =6.25 + j 1.25 ohm; Z2 = 5 + j0 ohm and Z3 = 5 – jXc ohm. Determine the value ofcapacitance of Xc such that the total current of the circuit will be in phase with the totalvoltage. When is then the circuit current and power.
A load is operating in a chopper circuit as shown in the figure. It has a duty cycle of 0.4 and chopping frequency is 150 Hz. (consider continuous operation). The value of E is L=0.06H 200V (B) 80V (D) 50V (A) 70V (C) 60V
(b) A symmetrical delta-connected 415V three-phase supply is feed to an asymmetrical delta- connected load as shown in Figure Q2(b). Assume that it is a RYB sequence. The impedances of the load are ZrY = 50 + j50 N , ZYB = 150 + j0 N and ZBr = 50 –j50 N. jos (i) Determine and draw the phasor diagram of phase currents in the load. (ii) Determine and draw the phasor diagram of line currents in the system.
1.1 We have two loads in delta and another in star in parallel, the impedances of the branches of the delta are equal and we have that RΔ=1p.u. and XΔ=0.75 p.u., while in the star we have equal values of the branches, but formed by admittances where we have the conductance in parallel GY=0.64 p.u. and inductive susceptance of BY=-j0.48 p.u. If the loads are being supplied by a positive sequence balanced three-phase source with line-to-line voltage of phases a and b of Vab=1∠ 30º, if the base values are line-to-line base voltage of 1kV and three-phase base power of 100kW. DetermineA) Line and phase voltages, line and phase currents of the load in delta, line and phase voltages of the star, line and phase currents of the star.B) Obtain separately the phasor diagram of the delta and star load with the values obtained in A), indicate on the scale that these are 1 p.u.=5cm for example.C) obtain the power triangle and the power factor separately for each load. D) Obtain the power…
Suppose that a current source with Is amperes of current is connected in parallel to a pair of impedances Z₁ and Z2. Let I₁ be the current through Z₁ and 12 be the current through Z₂. Then, the total voltage Is is divided between 1₁ and 12 in proportion to impedance values Z₁ and Z2. a. True O b. False

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