Emerging Solutions for Line Compaction

This paper presents various solutions for line compaction. The paper presents four emerging technologies that support increased power transmission capacity for a given right of way (RoW) and clearance level. Use of high temperature low sag (HTLS) conductor, which has relatively low sag at high operating temperatures, is suggested to reduce the height of the tower. Sag-tension calculations were made at different temperature levels and comparison was made to indicate how the usage of HTLS can have an impact on line compaction. Insulated crossarms can restrict the inward and outward swinging of the insulator. Since the insulators are directly attached to the tower, a metallic crossarm is not required and thereby, the load on tower is reduced. Monopole structures, which have a very small footprint are suggested instead of broader lattice tower. Monopoles are more flexible and have improved stability against wind loads. Testing of monopole structure at different load conditions is also presented. Interphase spacers are presented as an optional feature to prevent conductor galloping on EHV lines. Different types of interphase spacers are discussed in brief. At the end, a comparison is made between conventional towers with a monopole type structure with insulated crossarm.