Power Flow and Protection Analysis of 20kV System as Zero Down Time Program Support in Semarang City AreaJaka Windarta, Nugroho Agus Darmanto, Mohamad Dwi K, Arya Java Y and Muhammad Refanza D KE3S Web Conf., 359 (2022) 01006DOI: https://doi.org/10.1051/e3sconf/202235901006