I-AC Resonant Test System ye-Substation Electrical Equipment, iqulunqwe ubukhulu becala unikezelo lombane oluguquguqukayo, i-Excitation Transformers, i-Reactors, i-Capacitive dividers, eyilelwe i-AC yokumelana novavanyo lwamandla ombane wesixhobo sombane esingaphantsi kwe-500kV okanye ngaphantsi.