Design & construction of india's First Multi-Pole +/-320 kV HVDc transmission line Kant Chandra, Vyas A.K., Anand Anish, Singh R.N., Chauhan R.K. Power Grid Corporation of India Ltd Online published on 6 February, 2020. Abstract The First VSC based +/-320 kV HVDC transmission system of the country is being constructed by Powergrid Corporation Of India Ltd. (POWERGRID), the Central Transmission Utility of India, between Pugalur, Tamil Nadu and North Trichur, Kerala. The VSC based +/-320 kV HVDC transmission system consisting of two symmetric monopoles shall deliver 2000 MW of power through a narrow corridor. Due to severe ROW constraints in the area, special consideration in deciding configuration & dimensions of transmission line towers for +/-320 kV HVDC line was necessitated. For minimizing land use of transmission lines, all four poles of the +/-320 kV HVDC transmission system have been accommodated on the same structure, thereby developing the 1st Multi-pole HVDC overhead line of the country. Also for further reduction in corridor requirement for the multi-pole overhead line, special narrow base towers with sleek body have been developed. It may be mentioned that for transmission Design and development of the 1st Multi-pole HVDC overhead line has been carried out based on intelligible and methodical studies for assessment of air-gap/clearance requirements, conductor bundle selection and finalizing optimum positioning/placement of pole conductors so as to meet the electric field & interference level requirements stipulated by International guidelines within a narrow corridor. Special considerations have also been given to design of insulator strings so as to nullify the effect of increased insulator length (for meeting creepage distance requirements corresponding to very-heavy pollution level) on Right-of-Way requirements. The paper describes in details, the studies carried out for accommodating all the four poles on the same structure for India's 1st Multi-Pole 320 kV HVDC transmission line. Top Keywords Multi-pole, +/-320 kV, HVDC, Optimization, Space Charge, Surface Gradient, Electric Field, Right of-the-way, Narrow-base. Top |