| Title |
Secondary Current Range Extension of Current Transformers by Using Two Different Current Transformers and Absolute Evaluation Technique |
| Authors |
김윤형(Kim, Yoon-Hyoung) ; 한상길(Han, Sang-Gil) ; 정재갑(Jung, Jae-Kap) ; 한상옥(Han, Sang-Ok) |
| Keywords |
Current Transformer ; Current Range Extension ; Absolute Evaluation ; Ratio Error ; Phase Displacement ; CT Test System |
| Abstract |
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. |