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Esoterica
Electric motors driven by variable speed drives (VFD's) are sometimes known to exhibit premature bearing failure. Pulse-width-modulated VFD's employing insulated-gate bipolar transistors operating at high switching frequencies can induce shaft voltages which in turn can produce electrical discharge machining and circulating currents, causing damage to bearings and bearing races. The damage is seen as eroding of races and pitting of bearings. Circulating currents can also be induced within shafts, tachometers, attached equipment and motor bases. Solutions include using conductive grease, insulating the bearings, adding common-mode grounding and building motors with Faraday shields.

About Us

Delivering electrical engineering solutions is more than putting information on paper...

It's designing systems so the owner can afford it, the contractor can build it, and the people who use it never have to think about it.

GWA, Inc., is an electrical engineering firm offering a diversity of services, including consulting, forensic engineering, studies and reports, design and construction administration.

GWA specializes in medium voltage power distribution, electrical systems for buildings, engineering for power quality and reliability, electrical systems for civil works, electrical systems for healthcare and lighting for architecture, sports, roadways, parking lots, etc.

GWA places a high value on integrity in both internal and external relationships. We strive to maintain high ethical and technical standards within our organization and in our dealings with clients.

Project Spotlight:
MUSC power distribution center wins National Recognition
Before: The outdated Bee Street switching structure and substation served the campus at the Medical University of South Carolina.

After: Power Distribution Center B replaced the switching structure and substation. It incorporates drawout circuit breakers housed in a conditioned building for a safer and more reliable operating environment. The project also included new underground duct banks and medium voltage feeders as well as upgraded power sources from the utility company.

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