Which of the following is true for a 3-phase unbalanced load?a.Neutral current is the algibric sum of all phase currents..b.Neutral current always is zero.c.Neutral current is the vector sum of all phase currents.d.Neutral current is the vector difference of all line currents.

Answered: Which of the following is true for a…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Related questions

Concept explainers

Question

Which of the following is true for a 3-phase unbalanced load?

Neutral current is the algibric sum of all phase currents..

Neutral current always is zero.

Neutral current is the vector sum of all phase currents.

Neutral current is the vector difference of all line currents.

Expert Solution

Step 1

Balanced load

In 3 phase system is a condition where all three phases (lines) take same magnitude of current, with evenly spaced phase difference.

If the load is star connected, with neutral as return path, this neutral will carry no current. That's why vector sum of all three phase currents meeting at common neutral point is zero.

Which eventually means that magnitude of currents in all three phase are equal & are displaced from each other by 120 degrees and thus adds up to zero. Hence, zero neutral current

Step 2

. A unbalanced 3 phase load is one which is not equally distributed among all three phases.

Thus the current in 3 phases are unequal which leads to a non—zero neutral current

Since the load is unbalanced, the line currents will be different in magnitude and displaced from one another by unequal angles, The current in the neutral wire will be the phasor sum of the three line currents i.e. $I_{N} = I_{R} + I_{Y} + I_{B}$

Step by step

Solved in 3 steps with 1 images

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions