The Transactions of the Korean Institute of Electrical Engineers C (대한전기학회논문지:전기물성ㆍ응용부문C)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Evaluation Technique of Burden for Current Transformer using Current Transformer Comparator and Precise Shunt Resistor

전류변성기 비교기와 정밀션트저항을 이용한 전류변성기용 부담의 평가기술

  • Published : 2006.05.01
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Abstract

Both ratio error and phase angle error in current transformer(CT) depend critically on values of CT burden. Thus, precise measurement of CT burden is very important for the evaluation of CT. A method for the measurement of CT burden has been developed by employing the portable shunt precise resistor with negligible AC-DC resistance difference less than $10^{-5}$. The burden value(value and power factor) can be calculated from resistance and reactance obtained by measuring the change of ratio error and phase angle error caused by the change of shunt resistor. The uncertainty for the method is evaluated and found to be abut 2 %.

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References

  1. 한국표준협회, '계기용변성기(표준용 및 일반계기용)', KS C 1706, 1982
  2. P. J. Betts, 'Calculated Temperature Coefficients of Transformers' National Measurement Laboratory Technical Paper No 4, pp. 1-13(1977)
  3. 정재갑, 권성원, 이상화, 박영태 '전류변성기의 비오차와 위상각 오차의 계산값과 실험값의 차에 의한 측정시스템 유용성 검증기술에 관한 연구', 대한전기학회지, 53C권(4호). 213-217(2004)
  4. Tinsley 'Precision Resistance Measurement', Tinsley Precision Instruments 1995
  5. John D. Ramboz and O. Petersons, 'A Calibration Service for Current Transformers' NIST Special Publication, vol. 250, No. 36, p66, 1991
  6. ISO 'Guide to the expression of uncertainty in measurements,' 1991