计及谐波影响的氧化锌避雷器在线监测方法研究

Research on the Online Monitoring Method of Zinc Oxide Arrester by Considering Harmonic Effect

泄漏电流监测法是对氧化锌避雷器进行在线监测及状态诊断的有效方法,但避雷器承受电压存在谐波干扰时,传统泄漏电流特征量会出现效果不理想的问题。为了提高谐波干扰下避雷器运行状态诊断的准确率,在对避雷器泄漏电流特性分析的基础上,提出一种基于泄漏电流时间积分的新型特征量,并对该特征量的原理进行理论分析。提出特征量对于避雷器状态区分能力的评估指标,通过与其他传统特征量的实验比较分析,结果表明,所提出的泄漏电流时间积分新特征量具有更好的有效性和优越性,且抗谐波干扰能力更强,可在不同谐波电压干扰下很好地区分氧化锌避雷器的运行状态。

The leakage current monitoring method is an effective method for online monitoring and status diagnosis of zinc oxide arrester.But when there is harmonic interference in the voltage of the arrester,the effect of traditional leakage current feature is not ideal.In order to improve the diagnostic accuracy of arrester operating status under harmonic interference,based on the analysis of leakage current characteristics of arrester,a new feature based on leakage current time integral is proposed,and the principle of the feature is analyzed theoretically.The evaluation index of feature for the state distinguishing ability of the arrester is proposed.Through comparative analysis with other traditional feature,the results show that the new feature measurement of leakage current time integral proposed in this paper has better effectiveness and superiority,and the ability to resist harmonic interference is stronger,it can distinguish the operation status of zinc oxide arrester under different harmonic voltage interference.