摘要
针对雷电波中高频分量是造成行波保护误动作重要原因的问题,通过对轻型直击雷、重型直击雷和短路故障进行暂态分析,提出辨识雷击与短路故障暂态特征的分形-时域差分判据。利用分形理论提取初始行波电流的特征维数,快速识别雷击故障,再根据波头部分的形态特征差异采用时域差分法进一步细化和辨识轻型直击雷和线路故障,并从母线端测得的电流行波线模量来实现判据,在较短的时窗内迅速准确地辨识雷击和短路故障。仿真结果验证了判据的有效性与可靠性。
In allusion to the problem that high-frequency component in lightning wave is the important reason for causing malfunction of travelling wave protection,this paper makes transient analysis on light direct lightning,heavy direct lightning and short-circuit fault and proposes fractal-time domain difference criterion to identify transient characteristics of lightning and short-circuit fault.Fractal theory is used to extract feature dimension of initial travelling wave current and rapidly recognize lightning fault.According to morphological characteristic differences of wave tips,time domain difference method is used to further refine and identify light direct lightning and line fault,and criterion is realized by current travelling wave line modulus measured from the bus end,which could rapidly and correctly identify lightning and short-circuit faults in shorter time.Simulation results verify effectiveness and reliability of the criterion.
出处
《广东电力》
2016年第3期81-85,105,共6页
Guangdong Electric Power
关键词
雷击干扰
分形维数
行波
暂态特征
短路故障
lightning disturbance
fractal dimension
travelling wave
transient characteristic
short-circuit fault
