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Overload Relays for Motor Protection

Improve system reliability and efficiency BY KEVIN TRIMMER, Eaton Corporation Nearly a third of global energy demand is attributable to manufacturing. Overall, the industry’s use of energy has grown by 61 percent between 1971 and 2004. According to the International Energy Agency (IEA) analysis,...

Maximizing Electric Motor Efficiency

How to get the most from your rotating machines BY STEPHEN MANSFIELD, TechnoWise Inc. An area of great interest is improving the efficiency of electrical devices. More electric motor efficiency means less electrical energy consumed and thus less impact to the environment. By far, the largest...

Bearing Protection of Inverter-duty Motors

Although it is now common knowledge that inverters—also known as variable frequency drives—often induce unwanted motor shaft voltages, many customers who purchase three-phase alternating current (AC) induction motors do not realize that models labeled “inverter-duty” or “inverter-ready”...

Monitoring Stator Winding Deterioration

The importance of partial discharge testing in electric motors BY VICKI WARREN, Iris Power LLP Comparing partial discharge (PD) results obtained from a single machine is a valuable tool that enables companies to observe the gradual deterioration of a machine stator winding. Proper monitoring of...

Understanding Short Circuit Motor Contribution

A back to basics approach BY DARRELL BROUSSARD, GE Industrial Solutions An electric motor’s contribution is the current generated by a motor or motors during a short circuit condition. It represents a small but important value that is needed to determine the maximum short circuit current...

Reviewing Electric Motor Reliability Research

What did the studies really say—then and now? BY HOWARD PENROSE, Ph.D., CMRP One of the most frequently quoted studies related to electric motor reliability is a 1983 Electric Power Research Institute (EPRI) project, entitled “Assessment of the Reliability of Motors in Utility Applications:...
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Motors & Drives

Enhance Performance with VFD Technology

Energy savings for pumping applications

BY TOM NEUBERGER & STEVEN WESTON, Eaton

In the early days of variable frequency drive (VFD) technology, the typical application was in process control for manufacturing synthetic fiber, steel bars and aluminum foil. Because VFD improved process performance and reduced maintenance costs, they replaced motor generator sets and direct current (DC) drives. When the energy crisis occurred in the early 1970s, saving energy became a critical goal, and the use...

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Doble Calisto R9 DGA Monitor

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HVDC toughened glass insulator

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Electricity Today T&D Magazine - Transformer Issue

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Electrical Testing and Measurement Handbook Volume 7

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Electricity Today T&D Magazine - TRANSFORMERS Special Issue