摘要
输电线路的边界保护原理是在单端利用暂态分量中包含的高频分量是否经过线路边界这一特点构成的 ,当雷电冲击线路时 ,会使边界保护发生误动作。通过大量的仿真分析 ,发现在雷电冲击没有造成短路和造成弧光短路以及普通短路故障情况下 ,由于线路两端的避雷器造成暂态分量的小波谱随着时间的变化规律不同 ,并提取这一差别构成了雷电和短路的识别算法。输电系统的仿真模型采用频率相关模型 ,ZnO避雷器采用IEEE公认的频率相关模型。EMTP仿真验证说明了该算法的正确性。
Lightening strokes on transmission line will lead to the wrong response of boundary protection relays, which based on the high frequency transient components at single line terminal, due to the large amount of high frequency component produced by lightening strokes. Based on researching the characters of surge arresters and large amount of Electro Magnetic Transient Program (EMTP) simulations, the different characters of transients between lightening stroke and common faults are found out, and the algorithm based on wavelet transform for identification of short circuit fault and lightening strokes is proposed. The IEEE recommended frequency dependent model of ZnO surge arrester and lightening model, the frequency dependent line models and the lightening fault arcs models are utilized in the model. The EMTP simulations show that the result is correct.
出处
《继电器》
CSCD
北大核心
2003年第4期1-5,共5页
Relay
关键词
输电线路
边界保护
雷电冲击
故障
识别
避雷器
弧光短路
lightening strokes
arc fault
surge arrester
boundary protection
transmission lines
