ABB Distribution Protection Unit 1500R
9-9
Relay Installations
9/99
website:www.abb.com/papd
Figure 9-6. Typical VT and CT Connections for Directional Sensitive Earth Fault Units
USER SELECTABLE PHASE ROTATION
A-B-C (L1-L2-L3) or A-C-B (L1-L3-L2)
NORMAL
LOAD
FLOW
36
31
V
A
35
3V
0
0C
0B
0A
32
V
B
33
V
C
34
V
N
+
53
54
51
52
49
50
+
+
45
46
+
+
(L1) (L2)
(L3)
(UL1)
(UL2)
(UL3)
(UN)
52