Cost related optimum design method for overhead high voltage transmission lines

Abstract

SUMMARYThe design of transmission lines is often the key issue for the existence or absence of failures caused by lightning. Detailed engineering studies are usually performed by electric power utilities for the design of new transmission lines. However, there are also cases where the design is based simply on tradition or on utilities' standardization policy. The paper presents a cost related method for the optimum design of overhead high voltage transmission lines, which intends to reduce or even eliminate the lightning failures. Lightning failures' cost is related to design parameters' cost in order to calculate the optimum and most economic design parameter values. In order to validate the effectiveness of the proposed method, the method is applied on several operating Hellenic transmission lines of 150 and 400 kV, respectively, carefully selected among others, due to their high failure rates during lightning thunderstorms. Special attention has been paid on open loop lines, where a possible failure in them could bring the system out of service causing significant problems. The proposed parameters that occurred by the design method and which reduce the failure rates caused by lightning, are compared with the operating transmission lines' existing design parameters showing the usefulness of the method, which can be proved a valuable tool for the studies of electric power systems designers.

Mitigation of the Electric Field Under EHVTL in Limited Space Crowded With Human Activities

“…The grid can be dismantled after completing the activities below the lines and then reused again in other areas. It is also worth noting that the cost of the proposed grid is low and does not exceed a few hundred dollars, as the frame can be made of steel while the rest of the grid can be made of aluminum wires [34,35].…”

Multi-Objective Optimization of Transmission Lines / Elektropārvades Līnijas Daudzkriteriālā Optimizācija

“…Development of the methods that explore the sensitivity of the required present value of revenue in order to achieve design performance at the least cost is presented in [11], while in [12] a study is reported concerning the line optimization techniques that can be applied to decide between the standard and the optimized TL designs. An OHL design method [13] taking into account the lightning impact offers the most suitable line insulation level, tower footing resistance, and average height of shielding wires. In [14] another method for this purpose is developed, with the main objective of minimizing the total annual cost of the line considering the relevant technical restrictions.…”