CHAPTER 4: SETPOINTS
SYSTEM
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
4–69
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 K1.
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 2 bank.
SENS. GROUND CT PRIMARY
Range: 1 A to 12000 A in steps of 1
Default: 500 A
NOTE
NOTE:
The Setpoints > System > Current Sensing > CT Bank 3 -K2 option is available in 889 with
order code dependency “3-R1/R5”.
NOTE
NOTE:
Sensitive Ground CT in the K1 slot is order code dependent.
Voltage Sensing
Traditional VT
The Voltage Sensing menu provides the setup for all VTs (PTs) connected to the relay
voltage terminals.
The 889 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 889 is shown below:
Path:
Setpoints > System > Voltage Sensing > Ph VT Bnk1-J2 or (Ph VT Bnk2-K2)
PHASE VT BANK NAME
Range: Any combination of 13 alphanumeric characters
Default: Ph VT Bnk 1-J2 (or Ph VT Bnk 2-J2)
Enter the name of the phase voltage from bank J2 (or K2).
PHASE VT CONNECTION
Range: Wye, Delta
Default: Wye
Select the type of phase VT connection to match the VTs (PTs) connected to the relay.
PHASE VT SECONDARY
Range: 10.0 to 240.0 V in steps of 0.1 V
Default: 120.0 V
Select the output secondary voltage for phase VTs connected to the J2 bank.
PHASE VT RATIO
Range: 1.00 to 5000.00 in steps of 0.01
Default: 1.00
Select the phase VT ratio to match the ratio of the VTs connected to the J2 bank.
AUX. VT NAME
Range: Any combination of 13 alphanumeric characters
Default: Ax VT Bnk1-J2
Enter the name of the auxiliary voltage from bank J2.
