摘要
针对架空屏蔽电缆耦合雷电电磁波形成过电压侵入室内造成设备损坏等问题。通过对雷电电磁波传输理论及屏蔽电缆耦合雷电电磁波理论的分析,建立架空屏蔽电缆耦合雷电电磁波试验模型,采用impulse current generated system(简称ICGS)雷电冲击平台模拟8/20μs雷电流波形,对长度及终端负载不同的架空屏蔽电缆,分别做雷电冲击试验。得出以下结论:当屏蔽电缆悬空时,其耦合的雷电电磁波能量及残压与长度呈负相关,与冲击电压值呈正相关;当屏蔽电缆终端阻抗匹配时,其耦合的雷电电磁波能量及残压与长度、冲击电压值都呈正相关,但终端接地时,其耦合雷电电磁波能量将明显减小;屏蔽电缆长度越长,其耦合的雷电电磁波电压波形的周期越长,频率越大,能量衰减的越慢,且在波尾位置有明显的阻尼振荡。研究结果对架空屏蔽电缆雷电防护具有一定的指导意义。
In order to solve the problem of the equipment damage caused by tlae overvoltage of me lightning electromagnetic wave of the overhead shielded cable. Based on the theory of electromagnetic wave transmission theory and shielding cable coupling lightning electromagnetic theory analysis, a test to both and but terminal connected to the ground, the coupling of lightning electromagnetic wave energy will be obviously reduced; The longer the shielding cable length is, the longer the cycle of the lightning electromagnetic wave voltage waveform is coupled, the greater the frequency, the slower the energy atten- uation, and the obvious damping oscillation at the end of the wave, which has a certain reference value to the protection on the overhead shielded cable.
出处
《电瓷避雷器》
CAS
北大核心
2017年第6期7-13,共7页
Insulators and Surge Arresters
基金
国家自然科学基金项目(编号:41275008)
关键词
架空屏蔽电缆
雷电电磁波
雷电冲击平台
雷电流
残压
overhead shielded cable
lightning electromagnetic wave
ICGS
lightning current
re-sidual pressure
