Since insulator is charged

the position of insulator will affect the natural contamination of the insulator.To investigate the effect of insulator position on natural contamination

the natural contamination of insulators at dif-ferent heights in the 1 000 kV UHV Huainan substation of Anhui power grid was collected. The equivalent salt depos-it density（ESDD）

non-soluble salt deposit density（NSDD）

partial surface conductivity（PSC）

natural contamina-tion particle size and natural contamination components were measured. Experimental results show that: the locationnot only affects ESDD and NSDD

but also affects PSC

natural contamination components and natural contaminationparticle size;PSC and natural contamination components show U-shaped distribution along the string;the naturalcontamination of small particles at both ends of the insulator string is more than that in the middle;the lower the insu-lator location

the thicker the natural contamination of large particles. This study may provide a reference for studying the influence of insulator location on natural contamination of insulators.