This work presents a novel technique for the computation of radiated electromagnetic interference (EMI) levels due to corona on high-voltage (HV) transmission lines. The EMI levels computed using the present technique for various HV transmission lines from around the world matches well with the experimentally measured values, thus validating the present technique. Using the technique developed, the influence of transmission line length, distance of observation point from the line, conductor diameter as well as the transmission line configuration on the radiated EM field has been studied. It is seen that for observation points which are close to the transmission line corridor, the total radiated electric field remains almost constant for line lengths above 1500 m. For observation points which are far away, a longer length of the line needs to be considered for computation of the total electric field. In the study, it is seen that the transmission line conductor height and line configuration have marginal influence on the radiated electric field.
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