Comparative analysis of the characteristics of outlet short circuit and winding insulation fault of distribution transformer and its preventive measures
作者机构：Shandong Univ Technol Coll Elect & Elect Engn Zibo Peoples R China Shandong Univ Technol Coll Elect & Elect Engn Zibo 255000 Peoples R China State Grid China Technol Coll Jinan Peoples R China Shandong Huineng Elect Co Ltd Zibo Peoples R China
出 版 物：《HIGH VOLTAGE》 (高电压（英文）)
年 卷 期：2024年第9卷第3期
页 面：700-709页
核心收录：
学科分类：0808[工学-电气工程] 070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学]
基 金：National Natural Science Foundation of China
主 题：transformer windings fault diagnosis external circuit short-circuit currents winding insulation fault Finite element analysis electrodynamics inter-turn insulation failure actual distribution transformer power transformer insulation inter-turn short circuit fault winding inter-turn insulation faults magnetic fields outlet short circuit fault Transformers and reactors three-phase outlet short circuit coupled magnetic field-circuit model
摘 要：Outlet short circuit on the low-voltage (LV) side and winding inter-turn short circuit faults are hazardous to transformer operation. To investigate the formation mechanism of winding insulation faults of distribution transformer, ANSYS Maxwell was used to build a coupled magnetic field-circuit model with the same structural dimension as the actual distribution transformer. An outlet short circuit and winding inter-turn insulation faults were set by using the voltage-controlled switch in the external circuit of the model. Subsequently, the differences in the electromagnetic characteristics and the electrodynamic force distributions of the windings under three operating conditions, namely, nominal load, three-phase outlet short circuit on the LV side and inter-turn insulation failure were studied, respectively. The results show that compared with the rated load, in the cases of outlet short circuit and inter-turn insulation faults, the amplitude of winding current increases by 20 and 50 times, the magnetic field strength grows by 20 and 17 times, and the electrodynamic force rises by 400 and 230 times, respectively. Outlet short circuit fault is more likely to cause the winding instability and deformation, and inter-turn short circuit fault can easily burn out winding insulation. Therefore, corresponding preventive measures were proposed.
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