摘要
对超高压输电线路的暂态电流波形奇异点 (突变点 )处的奇异性进行了大量的分析 ,发现区内、外故障时的暂态电流波形在突变点的奇异性由于母线杂散电容、结合设备以及阻波器等的影响而有所不同 ,利用小波多尺度边缘分析来检测并放大这一区内、外波形奇异度的差异 ,并提出利用单端故障暂态电流构成具有绝对选择性的超高速保护新原理 ,EMTP仿真证明了该原理和方法的正确性。
This paper proposes a new principle of Transient based Protection for Extra High Voltage (EHV) transmission lines based on large amount of studying singularity degree of transient current signal at sudden change point utilizing wavelet multi scale edge detection method. During the fault period, there exist differences in singularity degree of transient current wave forms between internal and external fault as the result of the influence of bus bar capacitance, line traps and coupling capacitance. The difference is extracted and amplified by wavelet to construct a novel non\|unit ultra high speed protection principle.The Electromagnetic Transient Program (EMTP) simulation shows that the theory and methods proposed in the paper is correct.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2000年第11期56-61,共6页
Proceedings of the CSEE
关键词
超高压输电线路
单端量保护
暂态电流
protection for EHV transmission lines
unilateral transient current
wavelet transform(WT)
absolutely selective
