![GE SR345 Instruction Manual Download Page 31](http://html1.mh-extra.com/html/ge/sr345/sr345_instruction-manual_4122857031.webp)
CHAPTER 2: INSTALLATION
ELECTRICAL INSTALLATION
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
2–11
Figure 11: Ground/Sensitive Ground wiring
For Winding 2 ground CT, use relay terminals D12-E12 in the same wiring configuration as
shown above for Winding 1.
Zero sequence CT installation
The various CT connections and the exact placement of a Zero Sequence CT, for ground
fault current detection, are shown in the figure below. Twisted pair cabling on the Zero
Sequence CT is recommended.
Figure 12: Zero sequence core balance (CT) installation
Transformer Winding 1
Transformer Winding 1
897730.CDR
A
B
C
GROUND CURRENT INPUT
GROUND CURRENT INPUT
SR345
PHASE CURRENT
PHASE CURRENT
INPUTS
A
B
C
GROUND CURRENT INPUT
GROUND CURRENT INPUT
WITH ZERO SEQUENCE CT
WITH ZERO SEQUENCE CT
GROUND CURRENT INPUT
GROUND CURRENT INPUT
WITH RESIDUAL CONNECTION
WITH RESIDUAL CONNECTION
E8
D8
G
GROUND
I
N
N
I
G
E5
D5
D6
E6
D7
E7
G
I
N
GROUND
D8
E8
GROUND
D8
E8
Ground connection to neutral
must be on the source side
U
N
SHIELDED CABLE
LOAD
A
B
C
N
G
Ground
outside CT
Source
LOAD
SHIELDED CABLE
898733.CDR
A
B
C
Source
To ground;
must be on
load side
Stress cone
shields