基于泄漏电流三相不平衡度的避雷器在线监测优化方案

An optimal online monitoring scheme for lightening arresters based on the threephase imbalance of leakage current

避雷器在线监测数据易受环境温湿度和表面脏污等影响,而传统的泄漏电流报警阈值设定方法容易产生误告警。对此,提出一种基于三相数据趋势比对的避雷器在线监测告警算法,利用温湿度抑制算法抑制其对阻性电流的影响,在修正后的阻性电流数据基础上计算三相阻性电流的不平衡系数,并结合阻性电流的报警阈值制定出告警规则。以某220 kV变电站内避雷器为例进行验证,相比原有单一告警规则,该告警策略可有效降低误告警率,提高在线监测告警的准确率和实用化水平。

The online monitoring data of lightning arresters are susceptible to environmental temperature,humidity,and surface contaminants.However,conventional alarm threshold setting approaches for leakage current may result in false alarms.To address this issue,this paper proposes an online monitoring alarm algorithm for arresters based on the trend comparison of three-phase data.This algorithm utilizes a temperature and humidity suppression algorithm to mitigate their influence on the resistive current.It calculates the imbalance coefficients of the three-phase resistive current based on the corrected resistive current data and formulates alarm rules by combining them with the alarm thresholds of the resistive current.The algorithm is validated using lightning arresters in a 220 kV substation.Compared to the original single alarm rule,this alarm strategy effectively reduces the false alarm rate and improves the accuracy and practicality of online monitoring alarms.