CG Drives & Automation, 01-7318-01r1 FDUL/VFXR/FDUG/VFXG/AFR/AFG Main features 45
7.17.3.1.1 Over voltage ride through (OVRT)
The AFG OVRT capability is shown in Fig. 40. The capability applies to all kind of over voltages, i.e. 1-, 2- and 3-phase over
voltages.
Fig. 40 OVRT capability
7.17.3.1.2 Under voltage ride through (UVRT)
The AFG UVRT capability is shown in Fig. 41. The capability applies to all kind of faults causing under voltages, i.e. 1-, 2- and
3-phase faults with/without simultaneous ground fault.
Fig. 41 UVRT capability
U [%]
[0.1s,125%]
[12s,120%]
[60s,115%]
Time [s]601221.50.5 10
60
80
100
120
140
NOTE:
The upper voltage capability depends on ratio between
the AFG voltage rating and the nominal grid voltage. For
case with nominal grid voltage 400V, the OVRT
capability with type AFG46 up to 125 % is possible but
for case with nominal grid voltage of 440V, the OVRT
capability with type AFG46 is only possible up to 120 %.
U [%]
[3s,85%]
EN 50549-2
[0.25s,0%]
[20s,70%]
[10s,40%]
Time [s]2010231.50.5 10
20
40
60
80
100
NOTE:
The FRT mode I(zero) is required for UVRT with long
duration in combination with a remaining grid voltage
<40 %.
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