金属氧化物避雷器带电检测及异常分析

Live Detection and Abnormality Analysis of MOA

金属氧化物避雷器带电检测相比传统的停电检测具有极大的优势,但现场检测时带电设备之间存在错综复杂的耦合电容关系,不可避免地会给被试金属氧化物避雷器带来干扰。在分析"一"字形排列避雷器相间干扰基础上,结合实际检测案例,分析外界空间干扰所带来的影响,并指出在现场干扰条件下,当边相发生异常后采用边相补偿方式会导致正常相阻性电流检测数据异常,造成对避雷器设备状态的误判。现场检测时需根据实际干扰因素,对试验数据进行差异化分析,同时结合其他检测方法进行综合分析与评价。

Compared with traditional de-energized testing, live MOA testing has great advantages. But due to the intricate coupling capacitance relations among the energized devices in field test, interference to tested MOA is inevitable. Based on the analysis of interference between the phases of linear arresters, this paper analyzes the impact of environment disturbances, according to real testing cases. It points out that with surrounding interference, when the side phase is abnormal, the side-phase compensation causes abnormal changes of normal phase resistive current data, leading to misjudgment of MOA condition. In field test, it is necessary to analyze the differentiations among test data and analyze and evaluate comprehensively with other testing methods based on actual interfering factors.