Modern day overhead transmission lines are taking a giant leap in modernization, with the change in power generation from fossil fuels to renewable sources such as solar power, hydro power and wind power. The renewable generation needs to be connected to a large scale high voltage transmission grid. In Europe alone, 28.000 km of 400 kV transmission line is needed by 2020 to fulfil the aim of providing 20% of Europe’s energy from green energies. It means that more than 100.000 new pylons will be needed . For this reason, the next generation of overhead line is introduced, by developing new design pylons that are easier to erect, less costly, smaller and better looking than the old ones, which is important to get public acceptance. In this regard, a fully composite-based pylon for 400 kV lines is presented with a new innovative design concept shown in Fig. 1. The integration of insulators in cross-arm design is the prominent feature of the fully composite pylon in comparison with conventional towers. The unibody cross-arm of the pylon has 30 degree inclination and all of conductors are fixed on the cross-arm by cable clamps. Thus, the configuration of phase conductors on the cross-arm is in the form of diagonal and differs from other widely used configurations in overhead transmission lines i.e. horizontal, delta and vertical configurations. On the other hand, unlike traditional steel lattice towers, the pylon removes access to ground potential due to its non-conductive materials and therefore, the lightning shielding of pylon requires a ground potential access to shield wires which can be achieved by utilizing ground cable inside the hollow cross-arm and pylon body. However, efficient assigning of lightning shielding system for the fully composite pylon is one of the major challenges in the electrical design of the pylon which is also important in terms of mechanical and material designs. In this paper, the weak and strong points of the preliminary assigned shielding angle for the pylon are investigated and subsequently, an acceptable shielding angle will be derived from the electro-geometric model (EGM) to improve the lightning performance of the pylon.
|Title of host publication||Cigré Session 2016|
|Publication status||Published - 2016|
|Event||Cigré Session 2016 - Paris, France|
Duration: 21 Aug 2016 → 26 Aug 2016
Conference number: 46
|Conference||Cigré Session 2016|
|Period||21/08/2016 → 26/08/2016|