Investigations with a thermal imaging camera can detect possible faults through excessive heat and indicate their source.

Points where such heat can arise are, e.g. poor circuit connections such as cold soldered joints or incorrectly tightened screw connections. Excessive heat development can also occur in areas of cross-section reductions, line breaks within pipelines or winding components.
In general, increased contact resistance is made visible during operation when current is applied.

Infrared thermography can also be used, where necessary, to indicate areas with increased hysteresis and eddy-current losses, e.g. after pyrolysis of laminated cores. This can also be used to determine further treatment for repairing the laminated cores.

In this example case, vacuum-pressure impregnation would be applicable, in order to increase insulation between the sheets and minimize increased iron losses or hot-spots in the laminated cores.