摘要
感应雷过电压是造成配电线路跳闸频繁的主要原因之一。规程法计算配电线路感应雷过电压简化了计算过程,未考虑充分雷电放电物理过程及其他因素的影响。对此,基于HФidalen感应雷过电压计算方法,建立了10 kV配电线路感应雷过电压计算模型,并分析了落雷位置、雷电流幅值及波形、回击速度、大地电导率、线路长度及架空线高度等因素对线路感应雷过电压特性的影响。结果表明,雷电流波前陡度、回击速度、大地电导率、线路参数等显著影响线路感应雷过电压波形;配电线路感应雷过电压幅值随雷电流幅值、回击速度的增大而近似线性增大;配电线路感应雷过电压幅值随雷击点与线路间距、波前陡度、大地电导率的增大而非线性减小。研究成果可为配电线路防雷提供参考。
Lightning trip of power distribution line is mainly caused by lightning induced overvoltage. Regulations method is normally applied to calculate the lightning induced overvoltage on distribution lines. But it considers little on the lightning discharge process and other influencing factors. Therefore,the calculation theory of HФidalen model was introduced in this paper.Simulation model was built to calculate lightning induced overvoltage on 10 kV distribution lines. Comparisons were conducted to analyze factors of lightning stroke situation,amplitude and waveforms of lightning current,return stroke velocity,ground conductivity,length and height of line. The results show that the waveform of lightning induced overvoltage is greatly influenced by lightning current wave front,return stroke velocity,ground conductivity and line parameters; the amplitude of induced lightning overvoltage increases linearly with lightning current amplitude and wave front,lightning stroke velocity,but decreases nonlinearly with increasing ground conductivity and distance between stroke situation and power line. The study can provide reference for lightning protection of power distribution lines.
出处
《水电能源科学》
北大核心
2017年第6期190-194,共5页
Water Resources and Power
基金
国家自然科学基金项目(51407112)
山东省自然科学基金项目(ZR2016EEQ20
ZR2016EL17)
关键词
配电线路
感应雷过电压
落雷点
雷电参数
大地电导率
线路参数
power distribution line
lightning induced overvoltage
lightning stroke points
lightning parameter
ground conductivity
line parameter
