Cable Rating Reduction Factor due to Harmonic Currents
The presence of harmonic current in a power system increases the current in the neutral conductor due to phase current imbalance (refer to Fig. 1b). To ascertain that the current-carrying …
Harmonics and Neutral Currents
Before the advent of computers, variable speed drives, soft starters and other non-linear loads, the only source of harmonics in power systems are industrial plants using arc-furnaces. These arc-furnaces require …
What is the Allowable Harmonics In the Philippines?
I have written several articles about the effects of harmonics and its mitigation. Another question that may pop up is, what is the allowable harmonic content at the point of …
Transformer K-factor Rating and Variable Speed Drives
In this article, I have discussed the difference between a conventional transformer and a K-factor rated transformer. In modern-day plants, Variable Speed Drives (VSD) are widely used. The project I …
Transformer K-Factor Rating and Harmonics
What is Transformer K-Factor Rating A conventional transformer has restricted use in an environment where non-linear loads are utilized, unbalanced input voltage or load current exceeds 5% total harmonic distortion. …
Effects of Harmonics on Resistive Loads
As a continuation of my article on effects of harmonics on electrical equipment, let us provide an example of the effects of harmonic currents on 1-ohm resistive load drawing 1 …