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These days, we're all trying to do more with less, but GE Vernova can help. Our upgrades and modernizations can help you get more from your existing assets. Discover the possibilities with our interactive upgrades selector.
Controls
Control Lifecare Services
Whether you need 24/7 technical support, live remote diagnostics, onsite field engineering, or parts management, we have you covered with GE Vernova's Controls Lifecare Services (CLS).
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Cutting Carbon - Season 9
Join Dr. Jeff Goldmeer, Brian Gutknecht, and special guests for the final season of our 3-part series as they discuss the roles digital and electrification will play in the energy transition.
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High-speed balancing is a critical procedure for maintaining smoother operation and performance of gas and steam turbine generator rotors. This process involves spinning the rotor at or near its operational speed to identify and correct any imbalances that could lead to vibrations, wear, or damage during operation. GE Vernova recommends high-speed balancing, particularly after significant changes such as a rotor rewind with new copper, cooling conversions, or major machining upgrades.
Multi-tier process
During high-speed balancing, GE Vernova follows a precise series of steps to help ensure accuracy and reliability for gas and steam turbine generator rotors:
The rotor is mounted in the high-speed balance machine, and any necessary components like couplings or blades are assembled to simulate operational conditions. If needed, bearing modifications will be carried out to accommodate the rotors' configuration.
The rotor gradually accelerates to operating speed and then to the GE Vernova-specified overspeed, giving sensors time to monitor vibrations and detect any imbalances.
If an imbalance is detected, GE Vernova technicians use vibration data to pinpoint the location and magnitude of the issue.
Based on this data, technicians add, or remove weights to balance the rotor. This process is repeated until balance is achieved. A thermal balance will also be performed if selected by the customer.
Once balanced, the rotor undergoes a final high-speed test to help ensure vibration levels are within acceptable limits.
Timed precision
GE Vernova recommends high-speed balancing under the following circumstances:
Targeted support
High-speed balancing helps address several key performance issues:
While high-speed balancing is an essential procedure, GE Vernova doesn’t recommend it as a solution for every issue. It will not address:
GE Vernova’s high-speed balancing services offer more than precision: they provide foresight. As part of our advanced process, we offer integrated thermal sensitivity testing at key global facilities, including Schenectady, Richmond, Wroclaw, Birr, and Morelia.
Our testing process simulates actual thermal conditions by energizing the rotor field at or near rated speed. As the rotor heats, we measure subtle vibration changes, known as the thermal vector, to assess how the unit responds to thermal expansion and potential bowing.
We can also help quantify situations with elevated thermal sensitivity risk using machine design parameters, operational context, and fleet experience. The result is actionable data to support greater reliability, uptime, and lifecycle performance.
Balancing your rotor is also a chance to check your field winding's health. After overspeed and thermal testing, we run a flux probe test to check for shorted turns at real operating speed and temperature.
Shorted turns: what's the risk?
Our engineering team can walk you through what your specific situation means for risk, so you can decide what fits your schedule.
Validation of rotor stability across temperature ranges
Early detection of thermal-induced vibration or bow
Results without a need for full turbine load testing
Conducted in purpose-built, electromagnetically shielded bunkers
Testing supports both collector-ring and brushless excitation systems
Post-testing through GE Vernova’s broader diagnostic suite (electrical, mechanical, and insulation)
If we spot magnetic wedges during inspection, we can replace them at the collector and turbine ends
If results aren't clear-cut, we can run further tests, including Recurrent Surge Oscillography (RSO) and impedance testing
A new winding should have no shorted turns. An existing winding might have a few and still run fine
Get in touch with your GE Vernova representative for a thorough evaluation and a tailored solution to meet your needs. Using our R1 rotor checklist, we can help you make informed decisions about maintenance—saving time, reducing costs, and improving the reliability of your equipment.
Gas turbine generator services, parts and repairs, when and where you need them.
GE Vernova provides a complete range of cost-effective generator services spanning from inspections to complete flange-to-flange retrofits for air, hydrogen, and liquid-cooled generators rated from 20 to 1090+ MVA. Our global team of experts have performed hundreds of rotor and stator rewinds and have responded to thousands of planned and emergent outages.
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