CHAPTER 2: INSTALLATION ELECTRICAL INSTALLATION
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2–23
Zero-Sequence CT Installation
The figure below shows the various CT connections and the exact placement of a Zero
Sequence current CT, so that ground fault current can be detected. Twisted pair cabling on
the Zero Sequence CT is recommended.
Figure 2-26: Zero Sequence (Core Balance) CT Installation
Ground connection to neutral
must be on the source side
UNSHIELDED CABLE
LOAD
ABCN G
Ground
outside CT
Source
LOAD
SHIELDED CABLE
996630A5
AB C
Source
To ground;
must be on
load side
Stress cone
shields
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