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자료유형
학술저널
저자정보
저널정보
대한전기학회 Journal of Electrical Engineering & Technology Journal of Electrical Engineering & Technology Vol.2 No.3
발행연도
2007.9
수록면
300 - 305 (6page)

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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 ㎸ 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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Abstract
1. Introduction
2. Description of PEA‘s Distribution System
3. System Modeling
4. Experiment Result
5. Mitigation Technique
6. Application of Bifurcation diagrams for Ferroresonance Investigation
7. Practical Aspect of Overvoltage on Voltage Tramsformer
8. Conclusion
Acknowledgements
Appendix
References

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