Figure 16. Waveforms under internal fault (excluding CT saturation): ( a ) i self0 and i n0 ; ( b ) zero sequence differential current. Figure 16. Waveforms under internal fault (excluding CT saturation): ( a ) i self0 and i n0 ; ( b ) zero sequence Figure 16. Waveforms under internal fault (excluding CT saturation): ( a ) i self0 and i n0 ; ( b ) zero sequence differential current. di ff erential current. Figure 16. Waveforms under internal fault (excluding CT saturation): ( a ) i self0 and i n0 ; ( b ) zero sequence differential current.