11.6 a. Find I in the circuit in Fig. P11.6. b. Find VAN· c. Find VAB· d. Is the circuit a balanced or unbalanced three-phase system? Figure P11.6 n 02 Ω j 16 Ω www 240/0° V + 0.3 Ω 240/120° V 240/-120° V j2.4 04Ω 28 Ω www a 08 Ω j3.4 Ω Α 79Ω www www b 0.7 Ω www C 16 Ω ww I j56Ω Β 79Ω j72 Ω C 78 Ω 155 Ω j52 Ω 150 Ω N

11.6 a. Find I in the circuit in Fig. P11.6. b. Find VAN· c. Find VAB· d. Is the circuit a balanced or unbalanced three-phase system? Figure P11.6 n 02 Ω j 16 Ω www 240/0° V + 0.3 Ω 240/120° V 240/-120° V j2.4 04Ω 28 Ω www a 08 Ω j3.4 Ω Α 79Ω www www b 0.7 Ω www C 16 Ω ww I j56Ω Β 79Ω j72 Ω C 78 Ω 155 Ω j52 Ω 150 Ω N

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 2.22P: The real power delivered by a source to two impedances, Z1=4+j5 and Z2=10 connected in parallel, is...

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a) Find I, in the circuit in Fig. P11.6. b) Find VAN- c) Find VAB- d) Is the circuit a balanced or unbalanced three- phase system? Figure P11.6 c) 0.2 Ω j1.6 Ω 0.8 N j3.4 N Α 79Ω j55 N a 240/0° V 0.3 0 j2.4 b 0.7 N j5.6 N B 79 N j52 N 240/120° V 240/-120° V 0.4 N j2.8 N 1.6 N j7.2 N C 78 N j50 N
Unless given, use the: POLAR FORM for voltage and current, RECTANGULAR FORM for impedance. Consider the following circuit, supplied by a 500mARMS current source with a 30° phase shift (i.e. Isource=500230⁰ mA). R1 L1 320 mH C1 16 μF a. What is the total impedance of the circuit? b. What is the voltage drop on the 100-ohm resistor, R1? c. Is the circuit inductive, capacitive, or neither (resistive)? d. Draw the phasor diagram of the voltage and current at R1. e. What is the total power (apparent) delivered by the current source? f. Draw the phasor diagram of the voltage and current at the source. 11 sine 50 Hz 100 ell
XL=62 R1=40 Is R2=90 + + E1=100V20° AC R3=80 V3 Xc=72 ZT a. Calculate the total impedance (ZT). b. Compute the source current (Is). c. Find the current across the capacitor Xc. d. Calculate the voltage across the resistor R3. e. Find the average power delivered to the circuit (PT). f. Find the total power factor (Fp).
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An impedance z₁ = 8j5ohms is in parallel with an impedance z₂ = 3 + j7ohms. If 100V are imposed on the parallel combination. Find the branch current 11, 12 and the resultant current. Draw the corresponding phasor diagram showing each current and voltage drop across each parameter. Calculate also the equivalent resistance, reactance and impedance of the whole circuit.
5. (Prob # 11.23, pg. 439) (a) Find the rms magnitude and the phase angle of ICA in the circuit shown in Fig. P11.23. (b)What percent of the average power delivered by the three-phase source is dissipated in the three-phase load?
Consider the following circuit used to provide power for an inductive RL load. The input voltage is Vs-100V and the load has a 50 impedance value. The thyristor is working at a frequency fs = 2 kHz. The discharge current is to be limited to 40A and the required dv/dt is 40V/us. If the value of Cs is equal to 0.14uF, then the snubber losses are equal to: T1 Vs Select one: O a. 3.4W O b. 1.4W 5.4W Od. 7.4W
Given the circuit shown, answer the following questions I 20 ww 80 I3 Vs = 24/60° v E V1 j6n V2+ -j4 n one of the following statements is correct: Choose... 12 in Ampere equals to: Choose... the equivalent impedance in Ohm of the circuit is Choose... V2 in Volts equals to: Choose...
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…
A balanced positive-sequence wye-connected 60-Hz three-phase source has line-to-line voltages of VL = 440 V rms. This source is connected to a balanced wye-connected load. Each phase of the load consists of a 0.5-H inductance in series with a 30-Ω resistance. Assume that the phase of VanVan is zero. FIND Ia,Ib,Ic, Find the power delivered to the load And Find the reactive power delivered to the load.
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7. A source of 100 Volts rms is supplying a resistance 80 ohms in parallel with a 200mH inductor. To what angle is the current lag or lead? A. 46.7 deg. lag B. 43.3 deg. lag C. 46.7 deg. lead D. 43.3 deg. Lead 8. Two impedances Zı=2+j4 and Z2=R+j0, are connected in parallel. Determine R so that the pf of the circuit is 0.9 lagging. A. 3.2 ohms B. 4.2 ohms C. 2.4 ohms D. 6.4 ohms 9. The power factor of a load on a 120 volt. 60HZ source is raised from 0.707 to 0.866 lagging by connecting a 53 micro-farad capacitor across the load. What is the true power of the load in watts? C. 862 D. 268 А. 286 В. 682 10. A factory has an average demand of 176 kw at 70% power factor. What is the minimum size of capacitor required to raise the power factor to 95%? C. 122 KVAR D. 157 KVAR A. 165 KVAR B. 82 KVAR