Fig. 3

Current waveforms in different fault situations. (a) Switch Sa2 fault. (b) Switches Sa1and Sa2 fault. (c) Switches Sa1and Sa4 fault. (d) Switches Sa2 and Sa3 fault. (e) Switches Sa1and Sb1 fault. (f) Switches Sa2and Sb1 fault.

Current waveforms in different fault situations. (a) Switch Sa2 fault. (b) Switches Sa1and Sa2 fault. (c) Switches Sa1and Sa4 fault. (d) Switches Sa2 and Sa3 fault. (e) Switches Sa1and Sb1 fault. (f) Switches Sa2and Sb1 fault.