线路距离保护作为变压器后备的定值整定

Line Distance Protection Settings Used as Backup Protection for Transformer

分析了一次由于定值整定的不恰当造成距离保护误动的事故,分析了零序补偿系数的整定计算方法。在此分析的基础上,提出了220 kV馈供线路接地距离保护的零序补偿系数整定计算时应考虑变压器阻抗影响的观点。

Analysis on mal-operation caused by improper line distance protection settings is carried out, and the setting method for zero sequence compensation coefficients is discussed. Based on the analysis and discussion, some advice about zero sequence compensation coefficients settings is proposed when line protection used as backup protection for transformer, and the effect of transformer impedance can＇t be ignored in this instance.