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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...

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”...

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...

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...

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:...
Home Motors & Drives

Motors & Drives

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 stator winding deterioration allows companies to plan appropriate maintenance for the machine in accordance to International Electrotechnical Commission’s IEC 60034 standard: “Rotating Electrical Machines - Part 27-2: Online Partial Discharge...

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G&W Electric – Engineering the Next Evolution of Power

Motors & Drives Products

Pole Guard: Blocks Animal Access to Overhead Assets via Climbing the Pole

Spectrum Industries, Inc

DDIN Midsize Clipping Hook

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2018 On-Site Electrical Training Catalog

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Electricity Today T&D Magazine - Linemen Safety Special Issue

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Electrical Equipment Testing & Maintenance Vol. 6