Correct Answer - Option 1 : increases the insulation life
Coolant:
- It is a substance that is used to reduce or regulate the temperature of a system.
- This increases the insulation life of the alternator.
An ideal coolant has:
- Low viscosity
- Low cost
- Non - toxic in nature
- Chemically inert
- Neither causes nor promotes corrosion of the cooling system
Hydrogen is used as a high-performance gaseous coolant.
- Its thermal conductivity is higher than all other gases.
- It has high specific heat capacity, low density, and therefore low viscosity, which is an advantage for rotary machines susceptible to windage losses.
- Hydrogen-cooled turbo generators are currently the most common electrical generators in large power plants.
Sulfur hexafluoride is used for cooling and insulating some high-voltage power systems (circuit breakers, switches, some transformers, etc.
