Generator rotor removal and replacement
With a generator rotor removal and replacement from GE, you can swap rotors that need repairs for refurbished, off-the-shelf rotors—an exchange we can perform in less than 10 days.
Save time and money
Return to service faster with a rotor exchange
With GE’s generator-rotor exchange, you’ll see removal and replacement in only 7 – 10 days, which is up to 30 days faster than an in-shop rotor rewind. On average, each day of reduced downtime translates to a savings* of $30,000 to $130,000, depending on the time of year the outage is performed.
*Average savings based on 100 to 175 MW units
Save time and money
Up to 30 days faster
Reduced uncertainity
Fully tested on delivery
Peace of mind
We know your generator equipment
120+ exchange rotors
delivered to customers globally
> 2 million
operating hours
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:
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.
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
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.
Services
Explore our other generator rotor upgrades and services
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Ready to learn more about generator rotor exchanges?
