1. The main varieties of porcelain insulator products include: ordinary disc suspension porcelain insulator, pollution resistant disc suspension porcelain insulator, straw hat disc suspension porcelain insulator, ground wire disc suspension porcelain insulator, post porcelain insulator, pin porcelain insulator, porcelain cross arm insulator, post porcelain insulator, butterfly porcelain insulator, tension porcelain insulator and tram porcelain insulator;
2. The main varieties of glass insulator products include: standard disc suspension glass insulator, pollution resistant disc suspension glass insulator, aerodynamic disc suspension glass insulator and ground wire glass insulator;
3. The main varieties of composite insulator products include: composite suspension insulator, composite post insulator, composite pin insulator, composite cross arm insulator, composite lightning protection insulator and disc suspension porcelain composite insulator;
The manufacturing technology and development level of ± 800kV DC disk suspension, post and composite hollow insulator in China are analyzed. It is considered that the comprehensive technology of ± 800kV DC insulator in China has reached the international leading level. The technical and economic reliability are evaluated. It is considered that the disc suspension porcelain insulator and glass insulator are comparable in economy, but the disc suspension composite insulator has more advantages; Porcelain and porcelain composite insulators are comparable in economy, but porcelain composite insulators have more advantages. In order to ensure the operation reliability of insulators, it is suggested that 160 ~ 420kN double umbrella porcelain insulators are preferred for very light and light pollution grade insulator suspension "I" strings, and composite insulators are preferred for medium and heavy pollution grade insulator suspension "I" strings; It is also recommended to apply persistent anti pollution flashover coating (PRTV) on the surface of pillar porcelain insulator with a structural height of about 12m.
