Large distance antidirt insulator

The utility model relates to an insulator for high voltage line, and the utility model is especially adequate for a high voltage line which is suitable for electrified railway. This large distance antidirt insulator comprises a coupling cap, a coupling bar and an insulated porcelain body, and the coupling cap, the coupling bar and the insulated porcelain body are adhesive to form this large distance antidirt insulator. This large distance antidirt insulator is characterized in the improvement of the insulated porcelain body structure; the insulated porcelain body of the scheme one is hollow pagoda-shaped, and one end is flat-base conical, while the other end is opening conical; a multi-channel encircled isodiametric circular disk is arranged on the appearance surface of the middle-part hollow cylinder, and a transversal insulator is formed; the insulated porcelain body of the scheme two is large-angle wideopen umbrella-shaped, and a multi-channel circular ring is equipped below the umbrella fabric, and a vertical insulator is formed. The utility model has long leakage distance along the surface and good rainproof and antifouling performance; thus the utility model can reduce leakage loss and enhance reliability.