The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Compensation Algorithm for the Secondary Voltage of a Coupling Capacitor Voltage Transformer by Considering the Hysteresis Characteristics of the Core

코어의 히스테리시스 특성을 고려한 CCVT 2차 전압 보상 알고리즘

  • 강용철 (전북대 대학원 전기공학과) ;
  • 정태영 (전북대 대학원 전기공학과) ;
  • 강해권 (전북대 대학원 전기공학과) ;
  • 장성일 (전북대 대학원 전기공학과) ;
  • 김용균 ((주)한국IED Eng.)
  • Published : 2009.08.01
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Abstract

This paper proposes a compensating algorithm for the secondary voltage of a coupling capacitor voltage transformer (CCVT) in the time domain by considering the hysteresis characteristics of the core. The proposed algorithm estimates the three error terms i.e. the voltage across the secondary winding parameters, the voltage across the primary winding parameters, and the voltage across the capacitor and the tuning reactor. These three terms are added to the measured secondary voltage to obtain the correct voltage. The algorithm reduces the errors of the CCVT significantly both in the steady state and during a fault. The performance of the algorithm is verified under the various fault conditions by varying the fault distance, the fault inception angle, and the fault impedance with the EMTP generated data. Test results clearly indicate that the algorithm can increase the accuracy of a CCVT significantly under the fault conditions as well as in the steady state. The algorithm helps improve the performance of a protection relay or a metering device.

Keywords

References

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