Why sealed hydrogen gas is used for cooling the rotor in alternators

I visited the thermal power plant they told the in large alternators sealed hydrogen gas is used for cooling the rotor ........is there any reasons behind that and why other gases are not used???????


  • Saandeep Sreerambatla
    Saandeep Sreerambatla
    Hydrogen is used because it has highest heat transfer coefficient and it also has very less viscosity which helps in reducing the windage losses. (Windage losses are the losses which occur when there is a relative moment between air ( in our case hydrogen) and the moving object).

    What is the name of the thermal plant you have visited?
  • Dhayalan.S
    thanks for your reply

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