Highly Sensitive Enhanced Pilot Protection of Half-Wavelength Transmission Line Based on Directional Traveling Wave Energy
Shu Hongchun, Liu Litao, Tang Yutao, Han Yiming, Bo Zhiqian
State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly Kunming University of Science and Technology Kunming 650500 China
Abstract：The Half-wavelength transmission system can be used as an option to carry high-capacity new energy outbound trunk channels. However, the traveling wave protection faces challenges due to the weak fault traveling waves at the midpoint and far end of the line. The fault-traveling wave transmission characteristics under three types of buses at the half-wavelength transmission line protection installation are analyzed. After that, a new traveling wave direction element is constructed by the ratio of the incident wave and the reflected wave energy at the end of the adjacent line. As a result, the characteristic fault difference and fault recognition inside and outside the zone can be improved. This directional element establishes a longitudinal protection scheme for half-wavelength transmission lines with traveling transient wave energy. Lightning impulse corona simulation and RTDS digital-analog hybrid tests show that the protection has a sensitive start-up, strong selectivity, and no need for double terminal data synchronization. Moreover, its performance is better than traditional traveling wave protection.
束洪春, 刘力滔, 唐玉涛, 韩一鸣, 薄志谦. 基于行波暂态能量的半波长输电线路高灵敏增强型纵联保护方案[J]. 电工技术学报, 2022, 37(24): 6372-6387.
Shu Hongchun, Liu Litao, Tang Yutao, Han Yiming, Bo Zhiqian. Highly Sensitive Enhanced Pilot Protection of Half-Wavelength Transmission Line Based on Directional Traveling Wave Energy. Transactions of China Electrotechnical Society, 2022, 37(24): 6372-6387.
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