500kV曲江变电站2号主变压器低压侧三相对地电压不平衡的原因分析

摘要

Investigation is carried out in allusion to unbalance of three-phase voltage to earth at 35 kV low voltage side of No.2 main transformer in Qujiang substation.By establishing a theoretical analysis model and combining actual structure and measured data of the transformer,this paper calculates and analyzes reasons for causing unbalance of three-phase voltage to earth,and determines that causes are unbalance of equivalent capacitance to earth of 35 kV 2M bus and associated equipment,capacitance between transformer winding and winding ground capacitance.%针对500 kV曲江变电站2号主变压器低压35 kV侧三相对地电压不平衡的状况进行调研,通过建立理论分析模型,并结合变压器的实际结构与测量数据,计算分析引起2号主变压器2号母线三相对地电压不平衡的原因,确定了是35 kV 2号母线、关联设备对地等效电容及变压器绕组间电容和绕组对地电容不平衡.