Generators are an essential component of the power train, requiring them to run safely, smoothly and reliably at all times. However, due to changed operation modes (increased starts and stops) and ageing, they can be damaged (e.g. winding insulation faults) or even break down (e.g. arcing faults). Preferably this is proactively avoided, but should it happen, then it needs to be repaired as quickly as possible.
While being a stand-alone piece of equipment, it is typically intimately integrated with other equipment like gears, turbines and valves. During maintenance, this can lead to many interfaces.
Building on more than 75 years of generator experience, you can rely on fast response times and repairs to keep your generators running. Even if your generator has completely broken down, we can re-engineer the parts and can get you up & operating as fast as possible.
We service all major manufacturers like Siemens/KWU, Alstom/GE, ABB, Ansaldo, BBC, AEG/LDW, Elin, MFO/Oerlikon, Schorch, Garbe-Lahmeyer and many others. Thanks to similar in-depth knowledge related to gears, compressors and turbines, we can provide truly integrated services.
We can apply the full suite of inspections both on-site and in our workshop, allowing us to diagnose your machine’s condition:
- Visual and boroscopic inspections.
- Robotic inspection of the air gap, wedge tapping and EL-CID test.
- Diagnostic tests of the winding (Partial Discharges, tan δ, RSO).
- Corona camera inspection for visualization of discharges.
- High Induction test (loop test) with thermography of the stator lamination.
- NDT (dye penetrant, ultrasonic, magnetic particle).
- Modal Analysis (Bump Test).
- Online measurement system installation and online measurement/monitoring of partial discharges.
- Vibration measurement.
- Shaft voltage and shaft current measurement.
- Hydrogen leakage test.
Field Service & workshop
For almost all sizes up to 1000 MVA and from almost all manufacturers, we can take care of all required work in the chain: dismantling, overhaul, repair, testing, reinstallation, and commissioning.
Our repair capabilities include rotor- and stator rewinding , high speed balancing, stator core renewal, coils- and Roebel-bars manufacture and refurbishment of H2-auxiliary systems.
We try to work as much as possible on site, but if required, we have fully equipped workshops to support more complex projects.
- Long ring- and short-ring modifications of generator rotor body shrink seats for retaining rings
- Modified pole connections of turbogenerator rotors to avoid cracks
- Upgrade of pole coil connections of hydropower generator rotors
Shortest lead time
We are ready to support you with retaining rings, stator- and rotor-wedges, bearings and shafts, hydrogen sealing rings, Roebel bars, stator- and rotor-coils, ventilators and ventilator blades, insulation parts, slip rings and collectors, brush holders and brushes, (flexible) copper straps, coolers and more.
Parts that are not available any more, we can re-engineer and manufacture. We can also provide complete new rotors and stators, sets of coils or Roebel bars and re-wedging sets by reverse engineering.
- Inspection & diagnostics
- Overhaul & repair
- Spare parts
How we make the difference!
We have been repairing generators since 1947, giving us decades of know-how on large turbogenerators and hydro generators.
Flexible and experienced technicians ensure unrivalled response time and short lead times.
As an independent service provider, we can service any generator, regardless of type or manufacturer.
We are certified to the DIN EN ISO 9001:2015 and SCCP:2011 specifications.
Proven expertise in industrial Generators
Modification of a rotor - Grosskraftwerk Mannheim AG
Get in touch with us
Interested in learning more about our services? Let's have a talk!
Our Subject Matter Experts take the time to discuss your existing challenges and help you make smart decisions that best meet your needs.