Which factor does the constructional feature of the hydro- generators depend on?

The constructional features of hydro-generators depend on several factors, including:

1. Head and Flow of Water: The available water head (high or low) and flow rate significantly impact the design. High-head installations might lead to the use of Pelton turbines, whereas low-head situations are often suited for Kaplan turbines. These differences in turbine types necessitate varied generator designs.

2. Speed of the Turbine: The rotational speed of the turbine, which is determined by the type of turbine and the hydraulic conditions, dictates the design of the generator, especially its rotational speed. Lower-speed turbines may require generators with more poles to generate electricity at the standard frequency (50 or 60 Hz).

3. Power Capacity: The scale of power generation influences the overall size and type of generator. Larger installations require more robust and larger generators to handle the increased power output.

4. Type of Installation: The generator may be designed differently based on whether it’s for a run-of-the-river, storage, or pumped storage hydro plant. Each type of installation presents unique operational characteristics and constraints.

5. Cooling System: The method employed for cooling the generator (air, water, or hydrogen cooling, for instance) depends on the generator’s size and its operational environment. Larger generators typically require more efficient cooling methods.

6. Electrical Characteristics: The generator must be designed to match the electrical characteristics required by the grid or the specific use-case, including voltage, frequency,