Abstract: Along with the application of large crosssection conductor in extrahigh voltage grid construction, the demands of transmission line construction technology are raising continuously, the demands of construction quality are becoming higher and higher. The application of constant tension control system in line stringing construction can ensure the relaxation degrees of tension stringing conductors to be identical, can keep the tension to be steady, can ensure the tensions of each conductor of multibundle conductor to be identical, can ensure the accuracy of tension to keep constant while the speed of stringing is varying and can realize tension synchronously control, so the construction quality can be raised.

Key words: constant tension control system, line stringing construction, construction quality, wire tension, constant value