Control Power - GE 845 Instruction Manual

CHAPTER 2: INSTALLATION

Control Power

CAUTION:
CAUTION:
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 2-22: Zero Sequence (Core Balance) CT Installation
UNSHIELDED CABLE
Source
A B C N
LOAD
Control power is supplied to the relay such that it matches the relay's installed power
supply range.
Control power supplied to the relay must match the installed power supply range. If the
applied voltage does not match, damage to the unit may occur. All grounds MUST be
connected for normal operation regardless of control power supply type.
For more details, please refer to the Power Supply subsection located in the Introduction
chapter.
The relay should be connected directly to the ground bus, using the shortest practical
path. A tinned copper, braided, shielding and bonding cable should be used. As a
minimum, 96 strands of number 34 AWG should be used. Belden catalog number 8660
is suitable.
Figure 2-23: Control Power Connection
Ground connection to neutral
must be on the source side
G
Ground
outside CT
ELECTRICAL INSTALLATION
SHIELDED CABLE
Stress cone
Source
shields
A B C
To ground;
LOAD
must be on
load side
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