In a three-phase system, the neutral current is

By Aina Parasher|Updated : July 19th, 2022

In a three-phase system, when the loads are perfectly balanced, the neutral current is-

  1. Zero
  2. One-third of maximum
  3. Two-thirds of maximum
  4. At maximum

Answer: A. Zero

In a three-phase system, when the loads are perfectly balanced, the neutral current is zero.

Solution

For three-phase system

VAN=V∠0°

VBN=V∠-120°

VCN=V∠120°

When the loads are perfectly balanced; ZA=ZB=ZC=Z

The phase-A current is IAN=VAN/ZA=V/Z∠0°=I∠0

The phase-B current is IBN=VBN/ZB=V/Z-120°=I∠-120°

The phase-C current is ICN=VCN/ZC=V/Z∠120°=I∠120°

The neutral current IN=IAN+IBN+ICN

=I∠0+I∠-120°+I∠120°=0

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