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Chapter 8: 12MCQ (page 527)

Unbalanced three-phase systems may have nonzero values for all sequence components.

(a) True (b) False

Short Answer

Expert verified

Therefore, the correct option is (a): True.

Step by step solution

01

The balanced electrical system.

The system is said to be unbalanced when the current flows in the system and voltage across the voltage are unbalanced. The unbalanced current and voltage are produced in the system due to unequal load distribution. The neutral current of an unbalanced system is greater than zero.

02

Determine the correct option.

The unbalanced system is asymmetrical, and the phase shifts between the three-phase are different from 120 degrees. Due to this, the system may have zero and negative sequence components.

Therefore, the unbalanced three-phase system may have a non-zero value for all sequence components.

Therefore, the correct option (a) True.

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Most popular questions from this chapter

For Problem 8.12, compute the power absorbed by the load using symmetrical components. Then verify the answer by computing directly without using symmetrical components.

In a balanced three-phase system, what is the zero-sequence voltage? V0= _______________

Thecurrentsina∆loadarelab=10∠0°,lbc=12∠-90°andlca=15∠90°A.Calculate(a)thesequencecomponentsofthe∆-loadcurrents,denotedl∆0,l∆01andl∆2(b)thelinecurrentsla,lbandlcwhichfeedthe∆loadand(c)sequencecomponentsofthelinecurrentslL0,lL1andlL2.Also,verifythefollowinggeneralrelation:lL0=0,lL1=3l∆1∠-30°andlL2=3l∆2∠30°.

Determine the symmetrical components of the following line currents:

(a)Ia=6∠90°,Ib6∠320°Ic=6∠220°Aand (b)Ia=j40,Ib=40,Ic=0A.

In symmetrical-component theory, express the complex-number operator a=1∠120°in exponential and rectangular forms.
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