Theoretical and Simulation Study on On-line Monitoring Technology of Transformer Short-Circuit Impedance

2019 4th Asia Conference on Power and Electrical Engineering

能源学;电工学

Liu, Hao^1 ; Gan, Zhaohui^1 ; Liu, Xi^1 ; Yang, Fanglin^1 ; Wang, Chan^1 ; Wang, Chengwu^1

Kaili Power Supply Bureau of Guizhou Power Grid Co., Ltd., Kaili

556000, China^1

关键词: Axial displacements;    Degree of deformations;    Multiple measurements;    Short-circuit impedance;    Simulation studies;    Single-phase transformers;    Three-phase transformers;    Winding deformations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/486/1/012038/pdf
DOI  :  10.1088/1757-899X/486/1/012038

来源: IOP

【 摘 要 】

Based on the equivalent circuit of transformer, this paper deduces the calculation method of short-circuit impedance of three-phase transformer based on multiple measurement data. Taking a single-phase transformer as the research object, the 'magnetic field-circuit' simulation model is established. The normal operation and winding deformation caused by different axial displacements are simulated and analyzed. The results show that short-circuit impedance changes when transformer winding is axially deformed, and the degree of change is related to the degree of deformation. Compared with the normal situation, the short-circuit impedance increases by 52.1% when the four transformer coils are moved 15 mm each. Therefore, on-line monitoring of the transformer short-circuit impedance can reflect the abnormal deformation of the transformer winding to a certain extent.