Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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United Electromagnetic Characteristics and Online Monitoring Method of Static Air-gap Eccentricity of Turbo-Generator

  • Tang, Gui-Ji (Dept. of Mechanical Engineering, North China Electric Power University) ;
  • Ke, Meng-Qiang (Dept. of Mechanical Engineering, North China Electric Power University) ;
  • He, Yu-Ling (Dept. of Mechanical Engineering, North China Electric Power University) ;
  • Wang, Fa-Lin (Dept. of Mechanical Engineering, North China Electric Power University)
  • Received : 2015.05.20
  • Accepted : 2016.08.13
  • Published : 2016.11.01
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Abstract

The purpose of this paper is to investigate the united Electromagnetic characteristics for the effective monitoring on the static air-gap eccentricity (SAGE) of turbo-generator. Different from other studies, this paper not only studies on the unbalanced magnetic pull (UMP) and the vibration characteristics of the stator and the rotor, but also investigates the harmonic features of the magnetic flux density and the circulating current inside the parallel branches (CCPB). The theoretical calculation, together with the finite-element-method (FEM) simulation and the experiment verification, is taken for a SDF-9 type non-salient generator. It is shown that, when SAGE occurs, apparent double-frequency UMP and vibrations will be produced both on the stator and the rotor, while the CCPB will have an obvious increment at the $1^{st}$ harmonic component. In addition, the amplitude of the magnetic flux density will be of cosine distribution in the circumferential position of the air-gap, while in normal condition it is a constant. Moreover, the pass-band amplitude, together with the $1^{st}$ harmonic of the magnetic flux density, will be enlarged as well. These united electromagnetic characteristics can be used as the diagnosis and monitoring criterion for SAGE.

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References

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