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Plan ahead

Reduce uncertainty

You can order a rotor exchange as far in advance as you need to, substantially reducing the risk of schedule extensions and execution challenges due to late rotor parts, winding delays, or test failures that are common with an on-site generator. Your generator's new replacement rotor will arrive:

  • Fully tested
  • Wound with the latest enhancements
  • Thermally balanced
  • Ready to install
On-demand webinar

Generator Exchange Rotor Program

On-demand: available now 30 minutes

With an aging generator fleet that’s cycling more and more often, you face the challenge of maintenance not extending beyond your outage. Join our webinar to learn about GE’s faster alternative to in-shop rewinds.

Have questions? We have answers!

Generator rotor removal and replacement FAQs

What is the process used for a remaining life assessment (RLA) of rotors and accuracy rate?

GE leverages our records and knowledge of each generator to create modeling tools that enable us to assess the risk level.

Although the exact process and data used is considered proprietary to GE, you can certainly contact your local sales account manager to continue that discussion.

What are the most common signs of a faulty generator rotor?

Some common signs include:

  • Shorted turns
  • Vibration issues
  • Excitation current increases to maintain output
  • Inability to maintain output due to excitation limitations

These are all issues that can be determined while the rotor is running. More obvious issues are a grounded field or other condition that would trip the unit. Monitoring the condition of the rotor through products like GE’s Generator Health Monitoring will allow tracking and trending of issues.

Are there any other generator components or accessories that need to be replaced or upgraded with the rotor?

GE will assess the exchange rotor against your unit’s current configuration and determine if other replacement parts or modifications are needed. Some units won’t require modification to accept an exchange rotor.

Common modifications include:

  • Oil deflectors
  • Bearing liners
  • Hydrogen seals
  • Excitation system settings

How long does it take to repair a generator rotor winding?

Cycle time for a winding repair will vary depending on the work required.

A full field rewind will take about 30 days, depending on the model type and scope of work. But some repairs can be performed in as little as 1-2 weeks.

Can GE determine if an exchange rotor is compatible with my unit?

Yes we can!

The GE team is very experienced in performing the interchangeable study required to help ensure an exchange rotor will fit. As the unit OEM, we have the original unit records, along with repair records and outage reports.

Additional information from the customer may be required to augment the information we have available.

What rotors are available in stock—and does the list include OOEM generators?

We carry many models in our exchange program but availability varies with each outage season.

Common models like 7FH2, 324, 7A6, 330H, 7FH2-B and 9A5 are certainly within our program.

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OEM expertise

Peace of mind

Did you know that GE is the OEM for thousands of generators? That includes many sub-models that most other vendors don’t have experience servicing, so we can work with you to make sure your new rotor is interchangeable with your old one. To date, we have performed more than 120 rotor removals and replacements for customers all over the world—including 30 just in the last two years.

Available for the following models: 7FH2, 7FH2B, 7A6, 324, 7H2, 330H, BDAX 7-290ERJT, TRLI 115-36, TRLI 115-36, TRLI 115-52, 9A

GE’s Exchange Rotor Program has been running for more than 20 years. How does it work? You can exchange generator fields that need maintenance or repairs for refurbished, off-the-shelf, pre-wound, and tested fields.

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Consider your options

Is a generator rotor exchange right for you?

There are a number of things to consider when planning your outage, from the age and future operation mode of your generator to the best timing for an outage for your plant and customers. GE can perform a risk assessment to determine the condition of your rotors, identify the ones most at risk and the type of rotor, and any spare generator rotor parts you might need.