ʻO AC Resonant Test System no Substation Electrical Equipment, ka mea nui i hoʻokumu ʻia i ka mana o ka mana uila, Excitation Transformers, Reactors, Capacitive dividers, i hoʻolālā ʻia no ka AC kūʻē i ka hoʻāʻo uila o nā lako uila substation ma 500kV a i lalo.