ABB Distribution Protection Unit 1500R
9-8
Relay Installations
9/99
website:www.abb.com/papd
Figure 9-5. Typical Connections for Units with Sensitive Earth Fault Option
34
VN
33
VC
32
VB
31
VA
52
53
54
51
52
49
50
+
+
+
46
45
SENSITIVE EAR
TH F
A
UL
T
USING RESIDU
AL
CONNECTION OF CT'S
NORMAL
LO
AD
FLO
W
+
0C
0B
0A
(L1)
(L2)
(L3)
(UL1)
(UL2)
(UL3)
(UN)
34
VN
33
VC
32
VB
31
VA
52
53
54
51
52
49
50
+
+
+
46
45
SENSITIVE EAR
TH F
A
UL
T
USING WINDO
W
CT
NORMAL
LO
AD
FLO
W
0C
0B
0A
+
(L1) (L2)
(L3)
(UL1)
(UL2)
(UL3)
(UN)
47
+ 48
+ 48
47
USER SELECT
ABLE PHASE
R
O
T
A
TION
A-B-C (L1-L2-L3) or A-C-B (L1-L3-L2)