Evaluation of induction motor ground-wall insulation using infrared thermography

In this research work, and attempt has been made to study the behavior of form-wound stator bars that are subjected to steep-front pulse voltage waveforms by using infrared thermography. In this regard an accelerated aging test is developed by using electrical and thermal condition. The test condition include; voltage amplitude up to 3.5 kV/sup p/ pulse switching frequencies up to 3000 pps and test temperatures up to 155 degree C. During the aging process surface temperature profiles are recorded with an infrared camera as a mean for determining the highest stress regions. The experimental results show that both the voltage stress and the thermal losses are quantitatively higher with converter supply than in the case of power frequency. (author)