protection of rotating units in the electric generator

Explanation of the protection of rotating units in the electric generator: 

In the previous electrical circuits to explain the types of electric generators, we were told that we talked about the rotating diodes installed on the rotating shaft between the Exiter Generator Rotor and the Main Generator Rotor. Very high during normal operation. In the event of a large change in the load, an electromotive force (KDK) is generated on the ends of the coils of the electric field of the main generator, i.e. on the ends of the rotating unit, so these servers work for voltage jumps as a small resistance capable of dispersing this high energy, and the field voltage returns For its value, and if not used, the rotary unites will be damaged.

Rotary unit shape:

There are some protections for synchronous generators:

Protecting generators from dust:

We find that the synchronous generators are equipped with an air filter, which prevents any dust from entering the generator so that it does not fall on the coils.

Protecting generators from rain:

We find the special ventilation holes for the generators at an angle of inclination estimated at an angle of 60 under, preventing the entry of water inside the generator and not touching the electrical coils.

Protect generators from moisture:

Synchronous generators are provided with a heater inside the generator, and its temperature is adjusted to be slightly higher than the natural air temperature in order to prevent water vapor from condensing on the generator coils.