Electric Power ›› 2022, Vol. 55 ›› Issue (7): 22-32,41.DOI: 10.11930/j.issn.1004-9649.202202010

• Power System • Previous Articles     Next Articles

Transformer Hierarchical Fault Diagnosis Model Based on Dissolved Gas Analysis of Insulating Oil and Class Overlap Features

CHEN Tie1,2, LENG Haowei1,2, LI Xianshan1,2, CHEN Yifu1,2   

  1. 1. Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station, China Three Gorges University, Yichang 443000, China;
    2. School of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China.
  • Received:2022-02-10 Revised:2022-04-27 Online:2022-07-28 Published:2022-07-20
  • Supported by:
    This work is supported by National Natural Science Foundation of China (No.51741907), Open Fund of Key Laboratory for Operation and Control of Cascaded Hydropower Station in Hubei Province of China (No.2019KJX08)

Abstract: Dissolved gas analysis (DGA) of insulating oil can effectively identify transformer discharge fault and overheating fault. In order to improve the accuracy of transformer fault diagnosis, a transformer hierarchical fault diagnosis method is proposed based on class overlap features. Firstly, the support vector data description (SVDD) is used to divide the overlapping region of transformer fault sample data spaces, and the class overlap rate and class overlap degree are selected as the overlapping features to describe the class overlap degree and the importance of sample points respectively. And then, a hierarchical fault diagnosis model is established based on the class overlap rate. The samples of each diagnosis layer are trained separately by the separate training method, and a two-class fuzzy support vector machine (FSVM) is constructed based on class overlap degrees to diagnose faults. Experimental results show that the proposed method is more accurate than other models.

Key words: transformer fault diagnosis, class overlap, hierarchical diagnosis, SVDD, FSVM