PA-9 Series NEUTRAL OVERHEATING Application Guide

2022-07-21
●Neutral Wires will over heat in 3 phase systems generally when the 3 phase system is unbalanced or there is an excess of Harmonic Triplens. (Harmonics divisible by 3 / Zero Sequence Harmonics) Zero sequence harmonics do not cancel out, instead they add together on the neutral. This can cause neutral currents that exceed the line current. This is commonly seen in single phase systems that are dedicated to electronic loads. Common
●Causes of Overheated Neutrals include the following.
■Shared Neutrals
■Improper or Inadequate Wiring
■High Source Impedance
■SCR / Rectifier & Notching
■Harmonics.

Megger

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2008/2/5

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