MAINTENANCE TOOL USED FOR DOUBLE INSULATOR STRINGS OF DIRECT CURRENT TRANSMISSION LINE

A maintenance tool used for double insulator strings of a direct current transmission line comprises fixtures installed at the two sides of the double insulator strings and a tensioning device connected between the fixtures. The fixture comprises a clamp (1) on a V type string connected fixedly to a fitting hanging point angle steel at a tower body side, a clamp (2) on a cross arm connected fixedly on a cross arm wrapper sheet (8), and a knife-like clamp (3) connected fixedly to a V-type in-line plate (6). The tensioning device is a mechanical transmission lead screw (4) which is connected between the clamp (1) on the V type string and the knife-like clamp (3) or between the clamp (2) on the cross arm and the knife-like clamp (3). The maintenance tool has the advantages of sensible structure, high integral strength, low weight and reliable operation, thereby providing a reliable guarantee for the safe commissioning as well as routine maintenance of the direct current transmission line.