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 …
Engineers Need Actual Site Experience to Do Effective Design
In my several decades of experience in all phases of project implementation, concept definition, FEED, detailed design, procurement, construction, testing, and commissioning, I always find that some Engineers despite having …
Greenfield and Brownfield Projects
People who have been involved in project implementation may know what “Greenfield” and “Brownfield” projects mean. Prior to being employed by EPCM companies, I never knew what these terms mean. …
Lightning Damage to Structures
IEC 62305 – Protection against lightning Lightning is a very high-energy phenomenon. Lightning protection is often times taken for granted as the probability of a lightning strike to a structure …