Computation of electrical environmental effects of transmission lines

EHV and UHV AC transmission lines and electrical equipment produce electric and magnetic fields around their vicinity which are likely to produce various induction and biological effects when their levels exceed certain values. In addition to this, the electric field may initiate corona resulting in corona loss with associated interference nuisances like radio interference, audible noise etc. Transmission line planners should also take these factors into consideration at the design stage. This necessitates the requirement for establishing computational methods to estimate the above mentioned factors. The paper presents the software developed in CPRI for this purpose and discusses the algorithm used in the software for these computations