The fault line selection is the foundation of fault maintenance for low current grounding systems. To reduce the error rate,this paper proposes a fault line selection method for small current grounding systems based on variable fractional delay FIR filters. By using wireless sensors to sense the zero sequence current signal of the grounding system line,an open close combination filtering algorithm is used to filter the signal. A variable fractional delay FIR filter is used for signal transformation and fractional delay correction to extract the global amplitude characteristics of the zero sequence current signal. The cosine similarity is used to determine the fault line of the system,thereby achieving fault line selection for small current grounding systems based on variable fractional delay FIR filters. The experimental results show that the error rate of the fault line selection method proposed in this paper is within 1％,the accuracy of the line selection is high,and which has certain promotion and application value.
关键词
可变分数延时FIR滤波器/小电流接地系统/零序电流/开、闭组合滤波算法/余弦相似度
Key words
Variable fractional delay FIR filter/Low current grounding system/Zero sequence current/Open and closed combination filtering algorithm/Cosine similarity
维普
万方数据