Mitigating the effects of magnetic coupling between HV transmission line and metallic pipeline using slime mould algorithm

•Passive mitigation of the power transmission lines induced voltage is presented.•Slime Mould Algorithm (SMA) is investigated for optimizing the mitigation process.•The method is tested on horizontal configuration line with aboveground pipeline.•Optimum loops and magnetic shielding material result 60% induced voltage reduction.•High efficacy of the proposed technique.is compared with those of Carson’s formula.