Experiences in application of all dielectric self support system in CLP Power

Abstract

Pole-mounted switches with automation are widely employed at critical locations of CLP Power (CLPP)'s 11 kV overhead line system. It could help reduce Customer Minutes Lost (CML) in terms of shortening fault location time and hence faster supply restoration in the event of a fault on an overhead line circuit. The availability of radio communication link is of strategic importance to the effectiveness of distribution system operation and fault handling. However, in the areas with no radio coverage or where radio signal is being interfered, the provision of distribution automation will become infeasible. All Dielectric Self Supporting (ADSS) fiber optic cable, serving as an alternative communication media to radio is unaffected by electromagnetic interferences. Its light-weight and dielectric insulated material has make it possible to be installed on existing overhead lines without any major modifications. This characteristic is recognized as being capable of overcoming the constraints associated with the blocked or interfered radio zones, resulting in flexible implementation of distribution automation in designated areas. This paper discusses the project life cycle of the first trial application of ADSS system in CLPP's 11 kV overhead line system, covering the design, specification, construction, testing and commissioning stages. The practical experiences gained from the ADSS implementation process are also shared. (6 pages)