The partial TLA dung measurement of electric motors and generators during the current enterprise is world-wide increasingly used. Thus isolation problems can in time be recognized and revision work be better planned.

Teilentladungen are a symptom of the aging of the coil isolation. Teilentladungen are small electrical sparks, which arise in cavities of the isolation system. It can be determined by regular measurements of the Te activities whether defective equipment in the isolation system developed, and whether the coil has thereby a high loss risk.

Only at high voltage machines Teilentladungen cannot occur, but by the pulse load also at static frequency changer-fed low-voltage machines. A new Te measuring system for static frequency changer engines makes the measurement possible during operation or during a coil examination with impulse voltage.