ABB REF615 ANSI 5.0 FP1 - Page 18

18 REF615 ANSI 5.0 FP1 FEEDER PROTECTION AND CONTROL
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Figure 7. Substation
example in low impedance
grounded network using
the D and N standard
configurations with over-
current, ground-fault and
thermal protection for the
outgoing feeder cables
Figure 7 illustrates a substation example in low im-
pedance grounded network using the D and N stan-
dard configurations with overcurrent, ground-fault
and thermal protection for the outgoing feeder ca-
bles. The relays are equipped with optional arc pro-
tection function enabling fast and selective arc
protection throughout the switchgear. Additionally
the optional fault locator function is used in stan-
dard configuration N for the calculation of fault dis-
tance from the substation.
3
52
3
52
Δ
Y
52
REF615 Conf D
51P/50P
50BF
51G/50G
AFD
3
REF615 Conf D
51P/50P
50BF
51G/50G
49F
AFD
REF615 Conf N
51P/50P
50BF
51G/50G
49F
21FL
AFD
Cable
Cable