대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 2007년도 추계학술대회 논문집 전력기술부문
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- Pages.12-14
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- 2007
히스테리시스 특성을 고려한 전압 변성기 오차 보상 알고리즘
Compensation algorithm of a voltage transformer considering hysteresis characteristics
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Kang, Yong-Cheol
(Chonbuk National University) ;
- Zheng, Tai-Ying (Chonbuk National University) ;
- Park, Jong-Min (Chonbuk National University) ;
- Jang, Sung-Il (Chonbuk National University) ;
- Kim, Yong-Guen (Hankook Ied Eng.)
- 발행 : 2007.11.02
초록
A voltage transformer (VT) is used to transform a high voltage into a low voltage as an input for a metering device or a protection relay. VTs use an iron core which maximizes the flux linkage. The primary current of the VT has non-fundamental components caused by the hysteresis characteristics of the iron core. It causes a voltage drop in the winding impedances resulting in the error of the VT. This paper describes a compensation algorithm for the VT. The proposed algorithm can compensate the secondary voltage of VT by calculating the primary current from the exciting current of the hysteresis loop in the voltage transformer. In this paper, the exciting branch was divided into a non-linear core loss resistor and a non-linear magnetizing inductor. The performance of the proposed algorithm was validated under various conditions using EMTP generated data. Test results show that the proposed compensation algorithm can improve the accuracy of the VT significantly.
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