Power Transformer- Cooling Methods- Internal Cooling

Internal Cooling

The heating of the coils depends on their thermal conductivity, which is itself a function of
• Thickness of the winding
• External insulation
A coil design, which allows the copper heat to flow radially outwards with little cross insulation in the path of the flow, leads to economical rating in that a high current density can be employed for a given temperature rise without sacrifice of efficiency.