Sensitivity analysis of transformer winding equivalent circuit parameters based on incremental network method
YANG Siying1, WANG Song1, YANG Fengye1, QIU Shengxuan1, LI Tong2
1. Department of Power and Electrical Engineering, Northwest A&F University, Yangling, Shaanxi 712100; 2. Huangling Mining Group Co., Ltd of Shaanxi Coal and Chemical Industry Group, Huangling, Shaanxi 727307
Abstract：Frequency response analysis (FRA) is a reliable and practical method for detecting transformer winding deformation. To study the relationship between FRA curves and winding equivalent circuit parameters is great significant for exploring the information contained in FRA curve that reflects the state of winding and improving the cognition of FRA curve. In this paper, the sensitivity analysis method is introduced into the FRA curve of the equivalent circuit of the transformer winding. The incremental network method is used to deduce the relative sensitivity of different types of parameters in the equivalent circuit to the frequency response. And the quantitative relationship between the parameter changes of equivalent circuit and the FRA curve is established. By analyzing the sensitivity curve of the amplitude of FRA curve to the equivalent circuit parameters, the characteristics of different parameters on the amplitude of the FRA curve are studied. The research results of this paper are helpful to improve the cognition ability of engineers to the FRA curve, and can provide a support for further interpretation of the variation law of the FRA.
2023, Vol. 24 
