Investigation of Turn Insulation Failure Mechanisms in Large AC Motors
- 1 September 1984
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Apparatus and Systems
- Vol. PAS-103 (9) , 2588-2595
- https://doi.org/10.1109/tpas.1984.318427
Abstract
In old, large ac motors, turn insulation failure may result from rubbing of the turns against one another. A purely electrical failure might be puncture of the turn insulation (usually in line-end coils) by steep-fronted surges impinging on the motor terminals. Another mechanism which could cause a similar failure has been identified. This third mechanism involves degradation of the turn insulation by partial discharges (which are usually most severe in line-end coils) in the stator end winding area. Results of destructive tests on two motors as well as early results from a program to monitor voltage surges in service are presented. This work was partly funded by EPRI.Keywords
This publication has 1 reference indexed in Scilit:
- Distribution of switching surges in the line-end coils of cable-connected motorsIEE Journal on Electric Power Applications, 1979