This paper proposes a longitudinal protection scheme utilizing empirical wavelet transform(EWT)for a through-type cophase traction direct power supply system,where both sides of a traction network line exhibit a disti...This paper proposes a longitudinal protection scheme utilizing empirical wavelet transform(EWT)for a through-type cophase traction direct power supply system,where both sides of a traction network line exhibit a distinctive boundary structure.This approach capitalizes on the boundary’s capacity to attenuate the high-frequency component of fault signals,resulting in a variation in the high-frequency transient energy ratio when faults occur inside or outside the line.During internal line faults,the high-frequency transient energy at the checkpoints located at both ends surpasses that of its neighboring lines.Conversely,for faults external to the line,the energy is lower compared to adjacent lines.EWT is employed to decompose the collected fault current signals,allowing access to the high-frequency transient energy.The longitudinal protection for the traction network line is established based on disparities between both ends of the traction network line and the high-frequency transient energy on either side of the boundary.Moreover,simulation verification through experimental results demonstrates the effectiveness of the proposed protection scheme across various initial fault angles,distances to faults,and fault transition resistances.展开更多
近年来,为满足经济快速发展对矿产资源的强劲需求,复杂地形区深部矿产勘查成为研究热点(滕吉文等,2022)。航空ZTEM系统是复杂地形区深部矿产资源快速探测的重要工具。与传统的航空电磁探测系统相比,ZTEM具有勘探效率高、深度大、覆盖区...近年来,为满足经济快速发展对矿产资源的强劲需求,复杂地形区深部矿产勘查成为研究热点(滕吉文等,2022)。航空ZTEM系统是复杂地形区深部矿产资源快速探测的重要工具。与传统的航空电磁探测系统相比,ZTEM具有勘探效率高、深度大、覆盖区域规则等优势。倾子散度是ZTEM探测中用于地下结构成像的有效参数。它具有解释直观,异常目标识别能力强,多个异常体横向边界分辨率高等特点(Legault et al.,2012)。展开更多
基金supported by the National Natural Science Foundation of China(51767012)Curriculum Ideological and Political Connotation Construction Project of Kunming University of Science and Technology(2021KS009)Kunming University of Science and Technology Online Open Course(MOOC)Construction Project(202107).
文摘This paper proposes a longitudinal protection scheme utilizing empirical wavelet transform(EWT)for a through-type cophase traction direct power supply system,where both sides of a traction network line exhibit a distinctive boundary structure.This approach capitalizes on the boundary’s capacity to attenuate the high-frequency component of fault signals,resulting in a variation in the high-frequency transient energy ratio when faults occur inside or outside the line.During internal line faults,the high-frequency transient energy at the checkpoints located at both ends surpasses that of its neighboring lines.Conversely,for faults external to the line,the energy is lower compared to adjacent lines.EWT is employed to decompose the collected fault current signals,allowing access to the high-frequency transient energy.The longitudinal protection for the traction network line is established based on disparities between both ends of the traction network line and the high-frequency transient energy on either side of the boundary.Moreover,simulation verification through experimental results demonstrates the effectiveness of the proposed protection scheme across various initial fault angles,distances to faults,and fault transition resistances.
文摘近年来,为满足经济快速发展对矿产资源的强劲需求,复杂地形区深部矿产勘查成为研究热点(滕吉文等,2022)。航空ZTEM系统是复杂地形区深部矿产资源快速探测的重要工具。与传统的航空电磁探测系统相比,ZTEM具有勘探效率高、深度大、覆盖区域规则等优势。倾子散度是ZTEM探测中用于地下结构成像的有效参数。它具有解释直观,异常目标识别能力强,多个异常体横向边界分辨率高等特点(Legault et al.,2012)。
