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.
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. If this is your situation, 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 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.