An advanced Technique for Detecting Inter-laminar Stator Core Faults in Large Electric Machines

Sang Bin Lee, Manoj R. Shah, Gerald B. Kliman, W. Tony Mall, N. Kutty Nair, R. Mark Lasted

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


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 languageEnglish
Pages (from-to)1374-1381
Number of pages8
JournalConference Record - IAS Annual Meeting (IEEE Industry Applications Society)
Publication statusPublished - 2003
Externally publishedYes
Event2003 IEEE Industry Applications Conference; 38th IAS Annual Meeting: Crossroads To Innovation - Salt Lake City, UT, United States
Duration: 2003 Oct 122003 Oct 16


  • 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


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