The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Healthy Assessment of Generator Stator Cores using EL-CID (ELectromagnetic Core Imperfection Detector)

EL-CID를 이용한 발전기 고정자 철심의 건전성 평가

  • Published : 2009.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

The ELectromagnetic Core Imperfection Detector (EL-CID) test was performed on a small generator in the laboratory and a gas turbine generator in the field to assess the fault condition of generator stator core. Artificial defects with six different sizes were introduced in the small generator. The scan results on six defects show a very large increase in the magnitude of fault current compared to that obtained with a healthy core. After the stator core heats up, a thermal imaging camera was used to detect hot spot on the inner surface of the core for comparison. Several faults were found during inspection of the gas turbine generator with the EL-CID. It has been shown that the existence of a fault can be determined by monitoring the magnitude of fault current.

Keywords

References

  1. Sang Bin Lee, G, B. Kliman, M, R Shah, N, K. Nair and R M, Lusted, 'An Iron Core Probe Based Inter-Laminar Core Fault Detection Technique for Generator Stator Cores', IEEE Trans. on Energy Conversion, Vol. 20, No.2, pp, 344-351, 2005 https://doi.org/10.1109/TEC.2005.847977
  2. Digital EL-CID Operating Handbook, Adwell International Ltd, pp, 1 - 8, 2003
  3. Sang Bin Lee, G, B. Kliman, M. R Shah, Dongwook Kim, W, T. Mall, N, K Nair and R M, Lusted, 'Experimental Study of Inter-Laminar Core Fault Detection Techniques Based on Low Flux Core Excitation', IEEE Trans, on Energy Conversion, Vol. 21, No, 1, pp. 85-94, 2006 https://doi.org/10.1109/TEC.2005.853759
  4. D. B. Paley, 'Current Low Power Core Testing using EL-CID', lEE Colloquium, pp, 7/1-7/4, 1999
  5. 김희동, 주영호, '양수발전소 발전-전동기 운전중 감시 시스템 개발', 대한전기학회 논문지, Vol. 53C, No. 3, pp. 168-174, 2004
  6. 김희동, '운전중인 대형 터빈발전기에서 절연상태 평가'. 대한전기학회 논문지, Vol.53C, No. 6, pp. 324-329, 2004
  7. 김희동, 김병래, '가스터빈 발전기 회전자 권선의 절연상태 평가', 대한전기학회 논문지, Vol. 57C, No. 10, pp.1818-1821, 2008
  8. V, Warren and G, Stone, 'Recent Developments in Diagnostic Testing of Stator Windings', IEEE Electrical Insulation Magazine, Vol. 14, No, 5, pp, 16-21, 1998 https://doi.org/10.1109/57.714643
  9. G, Klempner, 'Experience and Benefit of using EL-CID for Turbine-Generators', EPRI Motor & Generator Predictive Maintenance & Refurbishment Conference, pp, 1 -16, 1995