随着分布式电源以及大量非线性负荷接入电网，电能质量扰动问题愈发突出，严重影响配电网关键设备损耗。目前，难以对多电能质量扰动工况下的变压器损耗进行准确测量，各电能质量指标对变压器损耗的影响程度难以量化。为此，根据电压偏差、三相不平衡和谐波三种典型电能质量扰动机理，设计出一种模拟变压器实际运行条件，可产生多电能质量扰动工况的实验平台。此外，采用灰色关联分析方法对实验数据进行处理，得到各电能质量指标与变压器损耗之间的关联程度。结果表明，三项电能质量指标均会影响变压器损耗，进而影响变压器的能效。三相不平衡扰动与其他扰动之间的耦合对配电网变压器的附加损耗影响最为显著，而电压偏差扰动与其他扰动之间的耦合对附加损耗的影响较小。该结论可为配电网能效分析与电能质量治理提供参考。

With the connection of distributed power generation and a large number of nonlinear loads to the power grid, the problem of power quality disturbance is becoming more and more prominent, and the loss of key equipment in the distribution network is seriously affected. At present, the transformer loss in the condition of multiple power quality disturbances is difficult to be accurately measured, and the loss influence degree of each transformer is difficult to be quantified by various power quality indicators. Therefore, according to the three typical power quality disturbance mechanisms of voltage deviation, three-phase unbalance and harmonic, a experimental platform which could simulate the actual operating conditions of the transformer and generate multiple power quality disturbance conditions was designed. In addition, the grey correlation analysis method was used to process the experimental data, and the correlation degree between each power quality index and transformer loss was obtained. The results show that the transformer loss will be affected by three power quality indicators, which will affect the energy efficiency of the transformer. The additional loss of the distribution network transformer is most significantly affected by the coupling between the three-phase unbalanced disturbance and other disturbances, while the additional loss is less affected by the coupling between the voltage deviation disturbance and other disturbances. This conclusion can be considered a valuable reference for the analysis of energy efficiency in distribution networks and the control of power quality.