Study on the Effect of Salt Density on Electric and Temperature Field of Contaminated Composite Insulator

doi:10.11985/2018.07.004

Abstract

Abstract:

With the rapid development of industry and agriculture, pollution has become a serious hidden danger to the safe operation of power grid, and flashover of outdoor composite insulators has occurred frequently. In order to understand the specific characteristics of flashover, the FZSW-10/4 composite insulator is used as the research object in this paper. Electric field and the temperature field were simulated, and the location where partial arc of insulator is more easily to ocurr is analyzed. The simulation results show that the conductive effect of salt density distort the electric field and makes the local electric field strength increase significantly. The temperature distribution characteristic of polluted insulators reveals the relationship between salt density and insulator surface temperature, which provides a theoretical basis for preventing insulator flashover.

Key words: Composite insulator, dirty flashover, electric field simulation, equivalent saltdensity, temperature field simulation

CLC Number:

TM216
TM852

Li Jing,Xu Peng juan,Yang Guang,Feng Yuning,Fu Si. Study on the Effect of Salt Density on Electric and Temperature Field of Contaminated Composite Insulator[J]. Journal of Electrical Engineering, 2018, 13(7): 23-30.

Figures/Tables 13

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污秽等级	污湿特征	盐密（mg/cm²）
0	大气清洁,距离泥质海岸盐场超过50km均常年维持优、良空气环境指标的地区	0.03
I	大气轻度污染,距离海岸盐场10~50km,存在少数工业园区,人口密集度有限,气候相对湿润、雨量丰富	0.06
Ⅱ	大气中等污染,因工农业发展和人口集聚,所在区域土地盐碱度提高且存在炉烟污秽,距离海岸盐场3~10km,潮湿多雾	0.10
Ⅲ	大气污染较严重,工业、人口集聚度高,所在区域重雾、重盐碱,距离海岸盐场1~3km,距离化工厂等污源源约0.3~1.5km	0.25
Ⅳ	大气特别严重污染,接近化学污染源、炉烟污染源0.3km以内,靠近海岸盐场约1km以内	0.35

污秽等级	等值附盐密度 /(mg/cm²)	水膜电阻率 /(Ω·m)	伞裙间隙电阻率 /(Ω·m)
0	0.03	20.40	102.00
Ⅰ	0.06	11.11	55.55
Ⅱ	0.10	6.25	31.25
Ⅲ	0.25	2.30	11.50
Ⅳ	0.35	1.67	8.35