Power Factor, Capacitors, Harmonic Filters, and Resonance Part 2
Mar 1, 2009, By Tom Shaughnessy, PowerCET Corp.
Last month, we discussed low power factor and how resonance can disrupt facility operations. This month, we'll talk about harmonic filter design and various...
Applying PQ Measurements to Predictive Maintenance
Dec 1, 2007, By Wade Thompson, Fluke Corp.
When it comes to predictive maintenance (PdM) on electrical equipment, the numbers don't lie. According to insurance claims data in NFPA 70B-2006, Recommended...
Observations on Supplemental Grounding and Bonding: Part 4
Oct 1, 2007, By William Bush, Panduit
In Part 3 of this article (September 2007), we described how single-point grounding (SPG) is not nearly as straightforward as multipoint grounding systems....
Observations on Supplemental Grounding and Bonding: Part 2
Aug 1, 2007, By William Bush, Panduit
In Part 1 of this article (July 2007), we described (per the Emerald Book and ANSI J-STD-07-A) supplemental grounding and bonding from the grounding electrode...
Coordination Guidelines for Susceptible Electronic Loads Part 2
Oct 1, 2006, By John DeDad, Senior Director, Editorial and EC&M Development
As noted in Part 1 of this article, starting on page 22 of the September 2006 issue, there are many factors to consider before deciding how to provide...
Coordination Guidelines for Susceptible Electronic Loads Part 1
Sep 1, 2006, By John DeDad, Senior Director, Editorial and EC&M Development
When it comes to providing suitable power, grounding, communications, and environmental control for a facility that has significant amounts of susceptible...
Evaluating Risk
Sep 1, 2006, By Peter Gross, P.E., and Robert Schuerger, P.E., EYP Mission Critical Facilities, Inc.
Probability is a fundamental concept in statistics, often thought of as the odds. It is defined as the ratio of the number of favorable outcomes to the...
Solving a Power System Capacity Problem
Jun 1, 2006, By Vaughn DeCrausaz, Starboard Electric, and Wade Thompson, Fluke Corp.
In 1996, a ski resort near Silverthorne, Colo. installed a pumping system to lift water up to a river, whose water flows into a lake at the base village...
The How's and Why's of Harmonic Distortion
Jun 1, 2006, By John DeDad, Senior Director, Editorial and EC&M Development
At one time, almost all electrical loads were linear those that weren't made up such a small portion of the total that they had little effect on electrical...
Applying Pole-Mounted Overvoltage Protection
May 1, 2006, By John DeDad, Editorial Director
A modern distribution system that feeds a facility having a significant environment of susceptible electronic equipment requires protection against lightning-induced...
Identifying and Mitigating Harmonics in AC Drive Applications
May 1, 2006, By Rick Hoadley, Rockwell Automation
Common to any production operation is movement, usually driven by electric motors. Better control of this movement contributes to improved operational...
Understanding Transients: A Primer
Mar 1, 2006, By John DeDad, Editorial Director
We've all heard the term used in discussions of possible power quality problems, yet we still seem to have a lack of understanding of what a transient...
