An iron core probe based inter-laminar core fault detection technique for generator stator cores

• Published in: IEEE transactions on energy conversion Vol. 20; no. 2; pp. 344 - 351
• Main Authors: Sang Bin Lee, Kliman, G.B., Shah, M.R., Nair, N.K., Lusted, R.M.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2005; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: AC generators; Failure; Fault detection; fault diagnosis; fault location; Generators; Induction generators; Insulation; insulation testing; Iron; Magnetic cores; Magnetic induction; Magnetic materials; maintenance; Manufacturing engineering; Probes; Production facilities; reliability; Stator cores; Stators; Testing
• ISSN: 0885-8969; 1558-0059
• DOI: 10.1109/TEC.2005.847977

A new technique for detecting incipient inter-laminar insulation failure of laminated stator cores of large generators is proposed in this paper. The proposed scheme is a low flux induction method that employs a novel probe for core testing. The new probe configuration, which uses magnetic material and is scanned in the wedge depression area, significantly improves the sensitivity of fault detection as well as user convenience compared to existing methods. Experimental results from various test generators tested in factory, field, and lab environments under a number of fault conditions are presented to verify the sensitivity and reliability of the proposed scheme.