Institution News Team
During a planned customer outage, MD&A completed a stator and field rewind on a GE® 7A3 generator.
Stator rewind process began with removal of the stator wedges and stator bars. The core was both visually inspected and electrically tested using an ELCID test to identify any shorted laminations.
Glaskyd sausage (conforming material) was installed between the top and bottom bars in the end winding. Conductive side ripple springs were installed to insure proper electrical contact between the slot wall and the bar.
New connection rings were then installed, all series and phase connections were brazed using induction heating. The bars were appropriately blocked, and the series loops were insulated.
Once removed from the stator, the generator field was identified with damage and sent to our Turbine- Generator Repair facility. Incoming electrical testing confirmed multiple shorts so we recommended a full rewind.
After each coil was re-installed, testing was performed. After the bake, the unit underwent a high-speed balance, two heat runs. All test results were acceptable.
MD&A is a full-service, OEM-alternative for generator service, parts and repairs with a track record of successful projects. Call MD&A today and be sure to sign up for our MD&A Insight e-newsletter.
Please enable JavaScript to view the comments powered by Disqus.
Read now
Download our Professional Engineering app
A weekly round-up of the most popular and topical stories featured on our website, so you won't miss anything
Subscribe to Professional Engineering newsletter
Opt into your industry sector newsletter
Javascript Disabled
Please enable Javascript on your browser to view our news.