Current Sensing - GE 845 Instruction Manual

CHAPTER 4: SETPOINTS

Current Sensing

Voltage Sensing
Traditional VT
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Path:
Setpoints > System
The names and the configuration of the current banks below apply only to 845 orders for
the protection of either two-winding transformers with voltage, or three-winding
transformers.
Path: Setpoints > System > Current Sensing > CT Bank 1-J1
CT BANK NAME
Range: Any combination of 13 alphanumeric characters
Default: CT Bank 1-J1
PHASE CT PRIMARY
Range: 1 A to 12000 A in steps of 1A
Default: 500 A
Enter the phase CT primary current for current sensing bank J1.
GROUND CT PRIMARY
Range: 1 A to 12000 A
Default: 500 A
Enter the rated Ground CT primary current for the ground current input for the selected
Current 1 bank.
Path:
Setpoints > System > Current Sensing > Current Bank 2-K1
Path:
Setpoints > System > Current Sensing > Current Bank 3-K2
The names and the configuration of the current banks below, applies only to 845 orders for
two-winding transformers without voltage.
Path:
Setpoints > System > Current Sensing > CT Bank 1-K1
Path:
Setpoints > System > Current Sensing > Current Bank 2-K2
The Voltage Sensing menu provides the setup for all VTs (PTs) connected to the relay
voltage terminals.
The 845 can be connected to 4 VTs, i. e. three-phase VTs from either a Wye (Star) or a Delta
connection, and one auxiliary VT. The VT inputs setup for the 845 is shown below:
Path:
Setpoints > System > Voltage Sensing > Ph VT Bnk1-J2
SYSTEM
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