A Novel Protection Scheme against Fault Resistance for AC Microgrid

Figure 2

Equivalent circuits for internal FTFR. (a) Single-phase to ground internal FTFR. (b) Double-phase to ground internal FTFR. (c) Three-phase to ground internal FTFR. (d) Phase-phase to ground internal FTFR.

(a)

(b)

(c)

(d)