换流变压器夹件接地电流偏大计算与分析

Calculation and Analysis of Converter Transformer Grounding Current Mechanism

换流变正常运行时普遍存在铁心系统接地电流过大现象,本文笔者分析了不同结构换流变铁心系统接地电流来源机理,采用能量法对一台换流变夹件接地电流进行计算,并基于计算过程提出一种换流变夹件接地电流快速计算方法。结合系统谐波频谱,将接地电流计算值与实测值进行对比,发现两者基波分量非常接近,高次谐波分量则有较大差异,最后分析差异原因并提出两点建议。

Converter transformer grounding current is higher than power transformer.The source of different structural converter transformer grounding current was analysed.Electrical energy method was used to calculate the grounding current and a quick calculation formula was proposed.Contrast calculated value and the measured value,fundamental wave value are very close.Difference between system and measured harmonic spectrum was analysed.