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FOMAB: replacement of the excitation controller and the generator synchronisation

After 25 years of good and loyal service, the excitation system of the Aboyeu generator (Horizontal 3.3 MW Pelton unit) has repeatedly broken down since 2015. FOMAB therefore consulted HYDRO Exploitation, first for the repair, then to find a long-term replacement solution.

The specialized engineers from the electrical unit proposed several replacement options. In agreement with the client, a decision was made to implement:

  • A complete excitation system board, including the regulator and its accessories
  • The generator grid synchronisation function

Integrating this new system within the existing installation required significant detailed engineering work, modification of the interfaces and modification of schematics. This prior preparation, combined with the efficient work of a HYDRO Exploitation electrician, paid off. Indeed, commissioning was completed with no surprises and in excellent conditions, which made it possible for the generator to be put back into operation quickly within the required schedule, thus reducing the duration of outage.

This implementation showcased:

  • The quality of the advice provided to our client
  • The high degree of technical skills of our employees in with regard to the automation & control of the hydro generator units.
  • Our effectiveness in terms of implementation, thanks to excellent collaboration and coordination between our different specialists.

(pictures:before - after)


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HYDRO Exploitation SA
Rue des Creusets 41
CP 750 - CH-1951 Sion
T +41 (0) 27 328 44 11
F +41 (0) 27 328 44 12
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