主变压器低压侧三相空载电压不平衡分析

Unbalance Analysis of Three － phase No － load Voltage in Low Voltage Side of Main Transformer

摘要:

主变压器空载试验经常发生于各发电厂以及变电站，由于设备出厂参数的差异一定程度上导致空载状态下 主变压器低压侧三相电压不平衡。通过向量分析以及等效电路的方法，分析了三相电压不平衡的原因，同时对不同 机组进行参数实测、运用数据计算，为主变压器空载状态下主变压器低压侧三相电压不平衡分析提供可靠依据。

关键词:主变压器空载; 主变压器低压侧; 三相电压不平衡

Abstract:

The no － load test of main transformer often occurs in power plants and substations，due to differences in factory parameters of equipment，there is three － phase voltage unbalance in low voltage side of main transformer under no － load condition． Through vector analysis and equivalent circuit method，the reasons for three － phase voltage unbalance are analyzed，and the parameters of different units are measured． The data computation provides a reliable basis for three － phase voltage unbalance in low voltage side of main transformer under no － load condition．

Key words:main transformer with empty load; low voltage side of main transformer; three － phase voltage unbalance