A method of compensating the DC magnetic bias for current transformers

Jun Chen; Lei Zhou; Chen Hu; Hongbin Li; Xin Feng; Yang Jiao

doi:10.1117/12.3014759

4 March 2024 A method of compensating the DC magnetic bias for current transformers

Jun Chen, Lei Zhou, Chen Hu, Hongbin Li, Xin Feng, Yang Jiao

Proceedings Volume 12981, Ninth International Symposium on Sensors, Mechatronics, and Automation System (ISSMAS 2023); 129814J (2024) https://doi.org/10.1117/12.3014759
Event: 9th International Symposium on Sensors, Mechatronics, and Automation (ISSMAS 2023), 2023, Nanjing, China

Abstract

When the bipolar HVDC transmission line works in the operation mode where the ground is used as the loop line, the DC current will be generated on the power transmission line, which will result in the DC magnetic bias of the current transformer (CT). The DC magnetic bias may bring many disadvantages to a CT, such as the magnetic saturation and the change of its transfer characteristic. Then the accuracy of the CT will experience a degeneration, which affects the fairness of power trading and the reliability of the relay protection. Therefore, a method of compensating the DC magnetic bias is proposed in this paper and it is comprised of 4 steps: recognizing the second harmonic, identifying the optimal compensation, V-I transformation and creating the opposite magnetic field. Moreover, tests are carried out to verify the validity and the results indicate that the proposed method makes much sense in power trading, relay protection and the stable operation of the power system.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jun Chen, Lei Zhou, Chen Hu, Hongbin Li, Xin Feng, and Yang Jiao "A method of compensating the DC magnetic bias for current transformers", Proc. SPIE 12981, Ninth International Symposium on Sensors, Mechatronics, and Automation System (ISSMAS 2023), 129814J (4 March 2024); https://doi.org/10.1117/12.3014759

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