전류변성기 두 대와 절대 평가 기술을 이용한 2차 전류 범위 확장

Secondary Current Range Extension of Current Transformers by Using Two Different Current Transformers and Absolute Evaluation Technique

  • 발행 : 2009.03.01

초록

We have developed a current range extension method to obtain the ratio error and phase displacement of a current transformer (CT) by using absolute evaluation method and two different CTs. The method was applied to CTs under test with the current ratios in the range of 5,000 A / 1 A - 20,000 A / 1 A. The ratio error and phase displacement of the CT under test obtained in this study are consistent with those measured at the national institute in Germany using the same CT under test within an expanded uncertainty (k = 2) in the overall current ratios.

키워드

참고문헌

  1. 정재갑, 이상화, 강전홍, 김명수, 김윤형, 한상길, 한상옥, "20,000 A 전류변성기 국가 표준 시스템 구축", 대한전기학회지, 57P(1호), 6-12, 2008
  2. 김윤형, 정재갑, 한상길, 한상옥, "전류변성기의 비와와 위상오차의 절대 평가 기술", 대한전기학회지, 57P(2호), 153-159, 2008
  3. Jae Kap Jung, Sung Won Kwon, Sang Hwa Lee, Jeon Hong Kang, "Calibration of Current Transformer", KRISS, C-13-2-0100-2006(E), 2006
  4. Tettex, "Automatic instrument transformer test set Type 2767", Haefely Test AG - instrumet transformer measurement, 2007. (www.tettex.com)
  5. Tinsley, "Precision Resistance Measurement", Tinsley Precision Instruments, 1995. (www.tinsley. co.uk)
  6. H. W. Price and C. K. Duff, "Effects of magnetic leakage in current transformers", University of Toronto Research Bulletin, No. 2, 167-90, 1921
  7. P. J. Betts, "Calculated tempeature coefficients of transformers", Australia Naional Measurement Laboratory Tehnical Paper, No. 4, 1-13, 1977
  8. D. Slomovitz and H. Souza, "Shielded electronic current transformer", IEEE Trans. on Instrum. and Measurement, 54, 500-2, 2005. https://doi.org/10.1109/TIM.2005.843565
  9. 한국표준협회, "측정 결과의 불확도 추정 및 표현을 위한 지침", KS A 3000. 2005
  10. Calibration of EPRO Current Transformer (Type : NCD 20000d, s/n : 2/06/0006) in PTB (Calibration mark: 2183 PTB 06, Calibration of 2006-07-20)