Abstract
As a line protection applied to various voltage levels, distance protection is of great value to ensure the reliable operation of the power grid. In this paper, taking a distance I section protection misoperation accident as an example, by analyzing its misoperation recording, the calculation principle is deduced, and the problems in the setting of the action area of the polygonal impedance element are pointed out. When the terminal fault is caused, the non-faulty phase-to-phase impedance falls into the action zone of the first section of the distance, causing misoperation. Therefore, a protection fixed value logic fixed value optimization scheme suitable for polygonal impedance elements is proposed, and an independent load limiting resistance limit condition is set for the distance I section to realize the self-adaptive optimization of the protection software. Finally, the fixed value verification and fault playback verification are carried out on the boundary of the optimized action area. The experiment proves the feasibility of the optimized scheme, which has great reference significance for improving the reliability of distance protection using polygonal impedance elements.
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Science and Technology Project (2021ZK07) of State Grid Zhejiang Electric Power Co., Ltd.
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Qian, Z., Cao, W., Qi, X., Wang, S., Pan, W., Fang, Y. (2023). Research on the Optimization of Fixed Value Boundary of Line Distance Protection Load Impedance. In: Yadav, S., Kumar, R., Zainuddin, H., Deng, L. (eds) Proceedings of the International Conference on Information Control, Electrical Engineering and Rail Transit. ICEERT 2022. Lecture Notes in Electrical Engineering, vol 1084. Springer, Singapore. https://doi.org/10.1007/978-981-99-6431-4_2
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DOI: https://doi.org/10.1007/978-981-99-6431-4_2
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