Anti-Condensation/ Space Heaters For HV Motors

Wound equipment (including large motors) have significant thermal mass. As the ambient temperature changes, the winding's temp can't follow the air exactly, so the temp differential can cause condensation of moisture from the air. Also, some insulating materials have a tendency to absorb moisture from the air. Once absorbed into the insulation, it is much more difficult to get the moisture out. Not only does it provide a possible means of electrical breakdown when the device is energized, it also can deteriorate the insulation physically.

The anti-condensation heaters keep the insulation temp higher than the fluctuations in ambient, so that condensation cannot take place, and absorbed moisture tends to be driven out.