Influence of Metal Particles on the Electric Field Distribution of Outlet Device in a 500 kV Transformer

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Liao, Yifan^1,2 ; Zhu, Wen^1 ; Dai, Dong^1 ; Liu, Lei^2 ; Tang, Li^2

School of Electric Power, South China University of Technology, Guangzhou

510641, China^1

Electric Power Research Institute, China Southern Power Grid, Guangzhou

510080, China^2

关键词: Alternating current fields;    Electric field distortions;    Electric field distributions;    Insulation breakdown;    Maximum field strength;    Metallic particles;    Microdischarges;    Particle radii;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/4/042096/pdf
DOI  :  10.1088/1755-1315/170/4/042096

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Transformer is an important equipment serving in power system. In this paper, the influence of metal particles on the electric field of transformer outlet device is studed via numerical simulation. The results reveal that the metal particles can increase the maximum field strength between the oil gap of the outlet device and the maximum field strength increases with the increase of the particle radius. The local field strength greater than the allowable oil gap may cause local micro-discharge. Metal particles in the alternating current field oscillation and discharge may be the bubble can make the electric field distortion, accelerate the process of insulation cracking and may further lead to insulation breakdown. By altering the oil gap width of outlet device, its insulation endurance can be improved under the influence of metallic particles.