The correct answer is: D. all of the above
Overvoltage protection is recommended for all types of generators, including hydro-electric generators, steam turbine generators, and gas turbine generators. Overvoltage can cause damage to the generator and its components, and can even lead to a fire or explosion. Overvoltage protection devices, such as surge arrestors, can help to protect generators from overvoltage damage.
- Hydro-electric generators are powered by the flow of water. The water turns a turbine, which in turn turns a generator. Overvoltage can occur in hydro-electric generators due to lightning strikes, switching surges, and other events.
- Steam turbine generators are powered by steam. The steam turns a turbine, which in turn turns a generator. Overvoltage can occur in steam turbine generators due to lightning strikes, switching surges, and other events.
- Gas turbine generators are powered by gas. The gas turns a turbine, which in turn turns a generator. Overvoltage can occur in gas turbine generators due to lightning strikes, switching surges, and other events.
Overvoltage protection is an important part of generator maintenance. By properly protecting generators from overvoltage, you can help to ensure their long life and reliability.