主变低压侧电压不平衡问题分析及处理  

Analysis and Treatment of Voltage Unbalance Problem at Low Voltage Side of Main Transformer

作　　者：吕银 高宗宝 黎宏飞 LV Yin;GAO Zongbao;LI Hongfei(Chuantou(Dazhou)Gas Power Generation Co.,Ltd.,Dazhou 635000,China;National Energy Group Science and Technology Research Institute Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]川投(达州)燃气发电有限公司,四川达州635000 [2]国家能源集团科学技术研究院有限公司,四川成都610000

出　　处：《电工技术》2025年第3期200-204,共5页Electric Engineering

摘　　要：介绍某一电压不平衡问题,前期通过故障录波图、相关试验等,初步分析认为电压不平衡主要由主变低压侧PT电感不一致引起,建议更换PT。后期在不同工况下,通过电容分压器实测主变低压侧三相电压,并分析相关数据,最终确定主变低压侧电压不平衡的原因。This paper introduces a voltage unbalance problem.Through the fault recording chart and related tests,the preliminary analysis shows that the voltage unbalance is mainly caused by the inconsistent inductance of PT on the low voltage side of the main transformer,and it is recommended to replace the PT.In the later stage,the three-phase voltage of the low voltage side of the main transformer was measured by the capacitive voltage divider under different working conditions,and the relevant data were analyzed to determine the cause of the voltage imbalance on the low voltage side of the main transformer.

关 键 词：主变低压侧空载电压不平衡 PT励磁特性试验 谐振 工频位移过电压 

分 类 号：TM403[电气工程—电器]