AC Resonant Test System bakeng sa Substation Substation Electrical Equipment, haholo-holo e entsoe ka phepelo ea motlakase e feto-fetohang, Excitation Transformers, Reactors, Capacitive dividers, e etselitsoeng AC e mamella teko ea motlakase ea thepa ea motlakase e tlase ho 500kV kapa ka tlase.