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Positive-sequence components consist of three phasors _________ with magnitudes and _________ phase displacement in positive sequence; negative- sequence components consist of three phasors with ________ magnitudes and _________ phase displacement in negative sequence; and zero-sequence components consist of three phasors with __________ magnitudes and __________ phase displacement.
To fill: The appropriate words in the given blank spaces.
Answer to Problem 8.1MCQ
The appropriate words are: equal,
Explanation of Solution
The method of symmetrical components is used to solve the unbalanced system. This method is also termed as three-component method. The balanced set of components are positive sequence component, negative sequence component and zero-sequence component.
Positive Sequence components: The positive-sequence system is represented by a balanced system of phasors having the same phase sequence (and therefore positive phase rotation) as the original unbalanced system. The phasors of the positive-sequence system are equal in magnitude and displaced from each other by
Negative Sequence components: The negative-sequence system is represented by a balanced system of phasors having the opposite phase sequence (and therefore negative phase rotation) to the original system. The phasors of the negative-sequence system are also equal in magnitude and displaced from each other by
Zero Sequence components: The zero-sequence system is represented by three single phasors that are equal in magnitude and angular displacement between all the phasors is
Therefore, in positive-sequence component, there are three phasors of equal magnitude but
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Chapter 8 Solutions
Power System Analysis and Design (MindTap Course List)
- -The equivalent impedance of a series combination of a 8-ohm resistor, a 8-ohm capacitor, and a 14-ohm inductor has an angle of ____ degrees. -A parallel combination of a 24-ohm resistor and a 32-ohm inductor will result to a total impedance of with horizontal component of ____ ohms. -The equivalent impedance of a series combination of a 8-ohm resistor, a 8-ohm capacitor, and a 14-ohm inductor has a magnitude of ____ ohms.arrow_forward1-In series R-L circuit transients, the momentary current imm is directly proportional to the RMS voltage. Select one: True False 2-Symmetrical components method are used to solve the symmetrical faults. Select one: True False 3-If the circuit has leading power factor, then it is called as _______________ circuit. Inductive Capacitive Resistive Resistive and Inductivearrow_forwardConductor spacings, types, and sizes do have an impact on the series impedance and shunt admittance. True Falsearrow_forward
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- 400Ω A k=0.9 600Ω B k=0.8 66Ω 600Ωarrow_forwardL-type equivalent circuit and parameters for a continuous sinusoidal phase of a 5.5 kW, 1450 rpm, line voltage 220 V and frequency 50 Hz star-connected 3-phase ASM, ignoring core (iron) losses given as follows: R1=0.21 Ohm, R2=0.18 Ohm, X1=X2=0.66 Ohm and Xm=9.9 Ohm i, i,R, R, jX m १ (1-s) R, S How many times the rated current will the inrush current be when the ASM is started directly? O 4.3763 O 2.6455 O 6.3414 7.1534 O 5.2280 O 8.0815 O 3.7473 O 1.2558arrow_forwardQ2. Figure Q2 shows the single-line diagram. The scheduled loads at buses 2 and 3 are as marked on the diagram. Line impedances are marked in per unit on 100 MVA base and the line charging susceptances are neglected. a) Using Gauss-Seidel Method, determine the phasor values of the voltage at load bus 2 and 3 according to second iteration results. b) Find slack bus real and reactive power according to second iteration results. c) Determine line flows and line losses according to second iteration results. d) Construct a power flow according to second iteration results. Slack Bus = 1.04.20° 0.025+j0.045 0.015+j0.035 0.012+j0,03 3 |2 134.8 MW 251.9 MW 42.5 MVAR 108.6 MVARarrow_forward
Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning