... , harmonic, phase angle, root of mean squire and power etc. for the control unit to make decisions. Adapting the principle of relay protection ... magnetic, 10% step;Accurate:Rated AC voltage, current @50Hz,25°C:0.2%Rated AC voltage, current @45-55Hz,25 ... .3%Rated AC voltage, current @40-60Hz,25°C: 0.5%EVT resolution:100μsClock Accurate:Runtime clock: ±1 ...