Zero Sequence Ct Installation - GE 350-A9 Quick Start Manual

ELECTRICAL INSTALLATION

Zero sequence CT installation

54
Figure 2-33: Ground/Sensitive Ground wiring
SOURCE
D8 E8
N I
G
GROUND
GROUND CURRENT INPUT
USED FOR POLARIZING
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 2-34: Zero sequence core balance (CT) installation
U SHIELDED CABLE
Source
A B C
LOAD
A
E8 D8
I N
G
GROUND
GROUND CURRENT INPUT
WITH ZERO SEQUENCE CT
Ground connection to neutral
must be on the source side
G
Ground
outside CT
350 FEEDER PROTECTION SYSTEM – QUICKSTART GUIDE
CHAPTER 2: INSTALLATION
A
B
C
E5 E6 E7
350
B C
PHASE CURRENT
INPUTS
D5 D6 D7
E8 D8
I N
G
GROUND
GROUND CURRENT INPUT
WITH RESIDUAL CONNECTION
898730A1.CDR
SHIELDED CABLE
Stress cone
Source
A B C
LOAD
shields
To ground;
must be on
load side
898733.CDR