ABB REF615 ANSI 5.0 FP1 Product Manual page 23

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In the application example in Figure 12, single bus-
Figure 12. Application
example of busbar
bar switchgear has been arranged into two bus
differential protection
sections separated with bus coupler. Standard con-
covering two zones using
standard configuration N
figuration N is used with high-impedance differen-
tial protection for busbar and covering two zones
with two protection relays.
3
52
3
Cable
Δ
Y
Υ or Δ
3
3
REF615 Conf N
67P/51P/50P
3
50BF
67G/51G/50G
27
52
27R
25
AFD
Υ or Δ
3 1
REF615 Conf N REF615 Conf N
3
51P/50P 51P/50P
50BF 50BF
67/51G/50G 67/51G/50G
49F 79
52
AFD AFD
3
Overhead
line
Stabilizing
varistor and
resistor
REF615 Conf N REF615 Conf N
87A 87A
87B 87B
87C 87C
AFD AFD
52
3
3
3
REF615 Conf P
3
67P/51P/50P
50BF
67N/51N/50N
27
27R
25
AFD
Δ
Y
Υ or Δ
3
3
REF615 Conf N
67P/51P/50P
3
50BF
67G/51G/50G
27
52
27R
25
AFD
Υ or Δ
3
REF615 Conf N
3 3
51P/50P
50BF
67/51G/50G
49F
52 52
AFD
3 3
Cable Overhead
line
23
1
REF615 Conf N
3
51P/50P
50BF
67/51G/50G
79
AFD