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Electric Motors

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...

Improving Motor Maintenance Practices

Useful approaches to building an effective operation and maintenance program BY IAN CULBERT AND VICKI WARREN, Iris Power Engineering The pressures to be more competitive and cost-effective in today’s deregulated market have driven plants to reduce resources by making more informed,...

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:...

Overload Protection for Electric Motors

Thermal images are an easy way to identify apparent temperature differences in industrial three-phase electrical circuits, compared to their normal operating conditions. By inspecting the thermal differences of all three phases side-by-side, technicians can quickly spot performance anomalies on...

Variable Frequency Drive Cable Best Practices

Correcting common mistakes that affect performance and safety BY PETER COX, Belden, Inc. Most industrial operations today are looking for ways to reduce costs in these tough economic times. Variable-frequency drives (VFDs) are popular in many applications because they provide energy savings and a...

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...
Home Motors & Drives

Motors & Drives

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, there are substantial opportunities to improve worldwide energy efficiencies.

More specifically, motor systems use more than 75 percent of a plant’s electricity. Driving energy efficiencies is more than being green. It...

Motors & Drives Articles

T&D Buyer’s Guide Companies

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Methodology for the maintenance program of high voltage substations

Lineman Rental Tools & Equipment

Photocontrol Failsafe Technology for Outdoor LED Lighting

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HVAC toughened glass insulator

All Purpose Work Gloves

STANDALONE OLTC EVENT RECORDER - OTM-X

Motors & Drives Shared Media

Catalog

Overhead & Underground T&D Handbook, Vol. 1

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Power Quality, Grounding and UPS Handbook Vol 10

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Industrial Electricity Efficiency Handbook Vol.1