基于局部放电测试技术的避雷器状态诊断方法研究

Research on Condition Diagnosis Method of Arrester Based on partial discharge Testing Technology

摘要:

避雷器经过长时间使用或受到外界环境的影响,可能会出现老化、损坏或失效的情况,影响避雷器状态诊断准确性,为保证避雷器状态的带电诊断性能,提出基于局部放电测试技术的避雷器状态诊断方法。模拟内部气隙、尖刺、沿面等局部放电现象的产生过程,确定不同局部放电状态下避雷器的运行特征,以此作为避雷器状态诊断标准。优化设计避雷器局部放电信号采集设备,利用该设备采集避雷器的实时状态信号,从统计和时频域两个方面,提取避雷器运行状态特征。利用局部放电测试技术,计算避雷器放电参数,通过特征匹配度和放电参数的比对,得出避雷器状态的诊断结果。实验结果表明,在200kV和500kV避雷器中,所提方法平均局部放电量诊断误差分别为0.5pc和1.0pc,局部放电相位幅值诊断误差0.01V和0.01V,状态诊断准确率平均值为99.5%和99.6%。

Abstract:

After prolonged use or exposure to external environmental influences, lightning arresters may experience aging, damage, or failure, which affects the accuracy of lightning arrester status diagnosis. To ensure the live diagnosis performance of lightning arrester status, a lightning arrester status diagnosis method based on partial discharge testing technology is proposed. Simulate the generation process of internal air gap, spike, surface and other partial discharge phenomena, determine the operation characteristics of the arrester under different partial discharge conditions, and take this as the diagnosis standard of the arrester status. Optimize the design of partial discharge signal acquisition equipment for lightning arresters, use this equipment to collect real-time status signals of lightning arresters, and extract operational status characteristics of lightning arresters from both statistical and time-frequency domain aspects. Using partial discharge testing technology, calculate the discharge parameters of the lightning arrester, and obtain the diagnostic results of the lightning arrester status through the comparison of feature matching and discharge parameters. The experimental results show that in 200kV and 500kV lightning arresters, the average diagnostic errors of the proposed method for partial discharge quantity are 0.5pc and 1.0pc, respectively, and the diagnostic errors for partial discharge phase amplitude are 0.01V and 0.01V. The average accuracy of state diagnosis is 99.5% and 99.6%.