750 kV变压器夹件接地电流超标的原因分析与处理

Cause Analysis and Treatment of Excessive Grounding Current of 750 kV Transformer Clip

针对一起750 kV变压器夹件接地电流过大的故障,本文进行了原因分析和现场处理。在不具备条件彻底消除缺陷的情况下,通过对故障性质的综合分析和判断,最终采用就地实测接地电压、计算得到限流电阻的方法进行限制。加装电阻后,现场实测结果表明,夹件接地回路串接计算得到的限流电阻限制接地电流是可行的。

Aiming at a fault of excessive grounding current of a 750 kV transformer clamp,this paper analyzed the cause and dealt with it on site.In the absence of the conditions to completely eliminate the defects,through the com⁃prehensive analysis and judgment of the nature of the fault,the method of finally measuring the ground voltage on the spot and calculating the current-limiting resistance is used to limit.After the resistance was installed,the field test results showed that it was feasible for the current-limiting resistance calculated by connecting the ground loop of the clamp to limit the grounding current.