Research on the shape coefficient of disc insulator strings for UHV transmission lines

Abstract

Following continuous lengthening of the ultra-high voltage disc shaped insulator strings, wind load plays a more important role in controlling of the disc insulator string. It is necessary to carry out deep study about the shape coefficient of disc insulator strings, learn the concrete wind pressure distribution, and wake flow condition of the insulator string in detail. To this end, we used the SST turbulence model to operate value simulation for the three-dimensional flow field of disc insulator strings. Results showed that value simulation could clearly simulate surface pressure of the insulator and distribution of tail flow; the fitness of calculation results for nonstructural grid and structural grid was very high; the structural grid could control every part of the grid well, but classification was complicated; the structure adaptability of the nonstructural grid was stronger compared with structural grid.