E3S Web Conf.
Volume 260, 20212021 International Conference on Advanced Energy, Power and Electrical Engineering (AEPEE2021)
|Number of page(s)||7|
|Section||Power Electronics Technology and Application|
|Published online||19 May 2021|
The study on the Mal-operation of the transformer current differential protection during external faults cause by CT saturation
1 E. Energy Technology Co., Ltd., Hangzhou, Zhejiang Province, China
2 State Grid Zhejiang Electrical Power Research Institute, Hangzhou, Zhejiang Province, China
3 Beijing In-To Simulation Technology Ltd., Beijing, China
* Corresponding author: firstname.lastname@example.org
This paper analyses the unusual mal-operation of the differential protection for transformer current differential protection during the external fault. The mal-operation reason is researched in detail, based on the mathematical analysis, the simulation, and the field recorded fault data analysis. It is disclosed that the CT saturation leads to the maloperation. Based on this, this paper analyses the improvement for the CT saturation identification method, and discusses the CT selection principles. This paper is aimed at attracting the attention on the problem of the CT saturation and proposing the reference of the analysis method the countermeasure for this problem.
Key words: CT saturation / Current differential protection / Transformer
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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