Multilin 469 Motor Management Relay ... - GE Digital Energy

CHAPTER 5: SETTINGS
5.3.2 Voltage Sensing
5.3.3 Power System
PHASE CT PRIMARY: “350”
MOTOR FULL LOAD AMPS: “330”
GROUND CT: “50:0.025”
PATH: SETTINGS S2 SYSTEM SETUP VOLTAGE SENSING
VOLTAGE [
MESSAGE
MESSAGE
MESSAGE
VT CONNECTION
TYPE:
ENABLE SINGLE VT
OPERATION: OFF
The manner in which the voltage transformers are connected must be entered here. A
value of “None” for VT CONNECTION TYPE indicates that no voltage measurement is
required. Note that phase reversal is disabled for single VT operation. All voltages are
assumed balanced. Also, frequency is only available for AN or AB connections.
The ENABLE SINGLE VT OPERATION settings is seen only if the VT CONNECTION TYPE is
“Open Delta” or “Wye”.
If voltage measurements are to be made, the turns ratio of the voltage transformers must
be entered. The VOLTAGE TRANSFORMER RATIO must be chosen such that the secondary
voltage of the VTs is between 40 and 240 V when the primary is at MOTOR NAMEPLATE
VOLTAGE. All voltage protection features that require a level settings are programmed as a
percent of the MOTOR NAMEPLATE VOLTAGE or rated voltage, where MOTOR NAMEPLATE
VOLTAGE represents the rated design voltage line to line.
For example, given the motor nameplate voltage as 4160 V and the VTs are 4160/120
Open Delta, set the voltage sensing settings as follows:
VT CONNECTION TYPE: “Open Delta”
VT RATIO: “34.67:1”
MOTOR NAMEPLATE VOLTAGE: “4160”
PATH: SETTINGS S2 SYSTEM SETUP POWER SYSTEM
POWER [
MESSAGE
MESSAGE
VOLTAGE TRANS-
FORMER
MOTOR NAMEPLATE
VOLTAGE: 4000 V
NOMINAL SYSTEM
FREQUENCY: 60 Hz
SYSTEM PHASE
SEQUENCE: ABC
SPEED2 PHASE
SEQUENCE: ABC
Range: Open Delta, Wye, None
Range: AN, BN, CN, OFF or AB, BC, OFF
Range: 1.00:1 to 300.00:1 in steps of
0.01
Range: 100 to 36000 V in steps of 1
Range: 50 Hz, 60 Hz, Variable
Range: ABC, ACB
Range: ABC, ACB
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–19