Maximizing VFD and UPS Performance 

Apr 1, 2009, By Randy Barnett, American Trainco, Inc.

If you're installing a variable-frequency drive (VFD) or uninterruptible power supply (UPS) or if you already have this equipment in place you should...

Power Factor, Capacitors, Harmonic Filters, and Resonance — Part 1 

Feb 1, 2009, By Tom Shaughnessy, PowerCET Corp.

According to the IEEE Standard Dictionary of Electrical and Electronic Terms, power factor (PF) is defined as the ratio of the circuit power (watts) to...

Saving Energy Through Load Balancing and Scheduling 

Jan 1, 2009, By Randy Barnett, American Trainco, Inc., for the Fluke Corp.

You can find significant energy-saving opportunities through load balancing and load scheduling when using power logging test tools. Whether conducting...

Six-Pulse Conversion and Harmonics 

Dec 1, 2008, By John DeDad, Senior Director, Editorial and EC&M Development

Most modern industrial facilities have widespread applications of nonlinear loads, many of which represent a significant portion of the total facility...

What is Power Usage Effectiveness? 

Dec 1, 2008, By Mark Szalkus, GE Digital Energy - Power Quality

A measure of a facility's total power delivered divided by its IT equipment power usage level, power usage effectiveness (PUE) is especially important...

When Does Poor Power Quality Cause Electronics Failures? 

Nov 1, 2008, Edited by John Dedad, Senior Director, Editorial and EC&M Development

To many of us, the utility power grid is a vast system of unknowns. Its performance can make unprotected electronic equipment useless....

Medium and Large UPSs Are Fastest-Growing Power Protection Segment 

Nov 1, 2008, 

VDC Research Group, Natick, Mass., estimates that the growth of worldwide shipments of medium and large uninterruptible power supplies (UPSs) surpassed shipments of smaller UPSs by more than 2-to-1...

Power Shift 

Oct 1, 2008, By Chuck Heller, Chloride North America

Responding to market needs, server technology has rapidly advanced, delivering high-density, highly reliable computing without the massive harmonics issues...

The Case of Overheated Transformers and Neutral Conductors 

Sep 1, 2008, By Steven L. Pay, P.E., L.C., LEED AP, Finnegan Erickson Associates

Historically, typical loads of commercial power systems have been predominately linear; however, in the last few decades, a significant portion of these...

Learning to Read Waveform Signatures 

Sep 1, 2008, By Mark McGranaghan, EPRI Solutions

Today, many facilities have online monitoring systems that continuously track power quality, provide valuable information about energy use, and characterize...

The How's and Why's of IG Wiring 

Aug 1, 2008, By Thomas M. Gruzs, Emerson Network Power

It's hard to buy a new electrical device these days that doesn't contain electronics....

Verifying Ground-Fault Coordination for MV Power Cable Shielding 

Aug 1, 2008, By John DeDad, Senior Director, Editorial and EC&M Development

According to the IEEE Buff Book, "A power cable must be protected from overheating due to excessive short-circuit current flowing in its conductor," which may damage or destroy the insulation....

Can Your SPD Go to Extremes? 

Jul 1, 2008, By Carey Mossop and Alan Chiste, Eaton Corp.

Surge protective devices (SPDs) have become an integral part of residential, commercial, and industrial power quality applications. The best SPDs provide...

The Case of the Unreliable Conveyors 

Jul 1, 2008, Edited by John DeDad, Senior Director, Editorial and EC&M Development

In certain instances, system operation problems can be cyclical, many times correlating with utility or facility power system operation. Other times,...

Powering Change in the Data Center 

Jun 1, 2008, By Russell Shetler, Emerson Network Power

Changes in the quantity, configuration, and density of servers are reshaping the data center environment these days....

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