Affiliations: [a] Marketing Service Center, State Grid Jiangsu Electric Power Co., Ltd., Nanjing, China
Correspondence:
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Corresponding author: Yu Zhou, Marketing Service Center, State Grid Jiangsu Electric Power Co., Ltd., Nanjing, China. E-mail: 15674721@qq.com, zy1.zj@js.sgcc.com.cn
Abstract: At present, there are shoddy transformers in the market, of which the windings are replaced by aluminum and copper clad aluminum. The commissioning of these transformers may cause poor power supply performance and excessive winding heating. The existing detection methods of windings are complex, time-consuming to operate and destructive. Therefore, a winding material identification method based on vibration characteristics is proposed. Firstly, the vibration accelerations of transformer cores and windings with different winding materials are theoretically derived. Furthermore, through the coupling simulation of magnetic field and structure field of distribution transformers, the calculated vibration characteristics of copper, aluminum, and copper clad aluminum are verified. Finally, by comparing the time domain, the frequency domain and time-frequency domain of acceleration signals, preliminary identification of winding materials is conducted, which lays a theoretical foundation for establishing a precise identification model for winding materials in the future. This work provides guarantee for the safe operation of the distribution network.
Keywords: Transformer, identification of winding material, vibration characteristics, multi-physical field coupling, time-frequency analysis
