Analysis on Air-Gap Magnetic Flux of Synchronous Generator According to Short-Circuit Types in Winding

권선단락 유형별 동기발전기의 공극자속 파형 분석

  • 배덕권 (충주대 공대 안전공학과) ;
  • 김동훈 (경북대 공대 전자전기컴퓨터학부) ;
  • 박중신 (위덕대 공대 전기공학부) ;
  • 이동영 (위덕대 공대 전기공학부) ;
  • 이성일 (충주대 공대 안전공학과)
  • Published : 2009.05.01

Abstract

As modem industrialized society progresses, the demand for electric power is increasing rapidly. The electric power system is getting amazingly bigger and complicated, which can easily induce serious troubles from the potential of large fault problems and/or system failure. The monitoring and diagnosis of the electric machine for the fault detection and protection has been important part in the electric power system. Most faults in the generator appear in the winding. This paper presents the air-gap magnetic flux characteristic of a small-scale 2-pole synchronous generator according to the faults in the field winding to protect the generator from the fault. The magnetic flux patterns in air-gap of a generator under various fault conditions as well as a normal state are simulated by using finite element method. These results are successfully applied to the detection and diagnosis of the short-circuit condition in rotor windings of a high capacitor generator.

Keywords

Synchronous generator;Air-gap magnetic flux;Finite element method;Short-circuit;Protecting method

References

  1. J.P. Sturgess, et al., 'Finite-element simulation of a generator on load during and after a three-phase fault,' IEEE Trans. on Energy Conversion, Vol. 7, pp. 787-793, Dec. 1992 https://doi.org/10.1109/60.182663
  2. Markus Zahn, Electromagnetic Field Theory, John Wiley & Sons, pp.331, 1979
  3. R. Wamkeue, et al., 'Line-to-line short-circuit-based finite-element performance and parameter predictions of large hydrogenerator,' IEEE Trans. on Energy Conversion, Vol. 18, pp. 370-378, Sept. 2003 https://doi.org/10.1109/TEC.2003.815672