Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Investigation and Mitigation of Overvoltage Due to Ferroresonance in the Distribution Network

  • Sakarung, Preecha (Department of Electrical Engineering, Dhurakij-Pundit University) ;
  • Bunyagul, Teratam (Department of Electrical Engineering, King Mongkut's Institute of Technology North Bangkok) ;
  • Chatratana, Somchai (National Science and Technology Development Agency (NSTDA))
  • Published : 2007.09.01
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Abstract

This paper reports an investigation of overvoltages caused by ferroresonance in the distribution system, which consists of a bank of open-delta single-phase voltage transformers. The high voltage sides of the voltage transformer are connected to the distribution system via three single-phase fuse cutouts. Due to the saturation characteristic of the transformer cores, ferroresonance can occur in the condition that the transformer is energized or deenergized with single-phase switching operation of the fuse cutouts. The simulation tool based on EMTP is used to investigate the overvoltages at the high side of voltage transformer. Bifurcation diagrams are used to present the ferroresonance behavior in ranges of different operating conditions. The simulation results are in good agreement with the results from the experiment of 22 kV voltage transformers. The mitigation technique with additional damping resistors in the secondary windings of the voltage transformers will be introduced. Brief discussion will be made on the physical phenomena related to the overvoltage and the damage of voltage transformer.

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References

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