Excitation System Services

The Excitation system generates variable DC voltage and current to the rotating field to regulate the terminal voltage of the generator within the permissible operating range.

There are two basic excitation systems in operation today: Brushless excitation systems, with rotating exciter machines and Automatic Voltage Regulator (AVR), or Static excitation systems (SES) feeding rotor directly from thyristor bridges via brushes.The main function of the excitation systems is to provide a variable DC to regulate the terminal voltage to the generator voltage within the permissible operating range of the machine.

Digital Exciters

If you are the owner of a turbine generator set built after 1990 you are most likely operating with the original Digital Excitation system. Depending on the vintage of your digital system you may have found that the OEM no longer supports your system or the OEM has sent a junior engineer with little experience in the field. This is very frustrating because with the OEM comes a very high premium price attached, and you expect excellence for that price.

TC&E can offer you a service solution that will meet all your service needs. Our excitation engineers are factory trained to work on several digital excitation systems. Please refer to our extensive list of digital systems below that our engineers are trained to work on. Contact TC&E today to further discuss maintenance and testing options available to you for your digital excitation systems.

Let us help you maintain your Digital Exciters


  • GE EX2000
  • EX2100
  • EX2100e
  • ABB Unitrol     
  • Hitachi
  • Basler DECS series AVR’s
  • Brush AVR’s

Analog Exciters

Analog Exciters have proven to be very reliable systems. However, as these systems continue to get older, many utilities are faced with the decision to continue maintaining analog exciters or upgrading them with newer technology. The reuse of the rectifier bridges has become increasingly popular as rectifier bridge technology utilized years ago has exhibited high reliability and proven to remain in excellent operating condition. Hence, replacing only the analog controls due to obsolescence and keeping the power SCR rectifier bridges may be a favorable economic solution for an excitation system upgrade.

Let us help you maintain or upgrade your Analog Exciters

TC&E can provide guidance on these types of decisions as well as provide the technical field solutions for either maintaining or upgrading your current exciter. Please contact us for further discussion and a quote.



  • GE Alterrex     

  • GE Generrex   

  • GE Bus Fed/Potential Source

  • GE Shunt  

  • GE Amplidyne

  • Basler SSE     

  • EM Regulator


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Using the latest technology, components, and lessons learned through decades of experience, TC&E can ensure complete reliability for both start-up and continuous operation.


Spending good money where it makes the most difference! We understand that O&M budgets are shrinking, so we work with the plants to understand where and when to repair, replace, or upgrade for maximum return.


This is the key to success in today’s competitive power markets. Heat Rate, Capacity, Start-Up, and Maintenance Costs are critical to the success of aging power plants.


Aging systems can continue to provide reliable service for many years to come with the proper service, maintenance, and repairs. Push your upgrades out 5-10 years with confidence.

Success Story

TC&E always supports MEAG Power with the most experienced field engineers at the right time. whether a planned outage or when things go bump in the night, TC&E has been there for me with the right people or hard to find parts resources when I needed them.
Matt Engelbert

Principal Engineer, MEAG Power, Plant Wansley Unit 9.

TC&E has always provided a high level of expertise and detail on our site—most notably, custom-tailored projects to reduce parasitic load during the off-peak seasons using logic and controls.

Marco Ferreira Jr.

Ocean Peaking Power LLC, Cogentrix

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