Abstract
An advanced technique for detecting incipient inter-laminar insulation failure in stator cores of large electric machines is proposed in this paper. The proposed scheme is an off-line method based on low flux stator core excitation that employs a new probe. An iron-core probe is placed in the wedge depression area of the stator and scanned axially to detect the variation in the measured flux due to a fault. Two fault indicators that provide clear indication on fault severity and location are proposed in this paper. A 120MW AC machine stator was tested under a number of intentionally inserted fault conditions using a portable field equipment recently developed. The experimental results show that the fault existence, location, and severity can be determined reliably using the proposed scheme. It is also shown that the fault detection sensitivity and reliability, inspection speed, and user convenience are significantly enhanced.
| Original language | English |
|---|---|
| Pages (from-to) | 1374-1381 |
| Number of pages | 8 |
| Journal | Conference Record - IAS Annual Meeting (IEEE Industry Applications Society) |
| Volume | 2 |
| Publication status | Published - 2003 |
| Externally published | Yes |
| Event | 2003 IEEE Industry Applications Conference; 38th IAS Annual Meeting: Crossroads To Innovation - Salt Lake City, UT, United States Duration: 2003 Oct 12 → 2003 Oct 16 |
Keywords
- AC machines, Inter-laminar insulation failure, Stator core fault, Regular maintenance, Stator core inspection, Fault diagnostics
ASJC Scopus subject areas
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering