V Oltage S Ensing - GE 469 Instruction Manual

5.3.2 Voltage Sensing
 VOLTAGE
SENSING
5.3.3 Power System
 POWER
5–20
PHASE CT PRIMARY: "
MOTOR FULL LOAD AMPS:
"50:0.025"
GROUND CT:

PATH: SETTINGS S2 SYSTEM SETUP
[]
MESSAGE
MESSAGE
MESSAGE
The manner in which the voltage transformers are connected must be entered here. A
value of "None" for
VT CONNECTION TYPE
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
"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
voltage of the VTs is between 40 and 240 V when the primary is at
. All voltage protection features that require a level settings are programmed as a
VOLTAGE
percent of the
MOTOR NAMEPLATE VOLTAGE
represents the rated design voltage line to line.
VOLTAGE
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:
"34.67:1"
VT RATIO:
MOTOR NAMEPLATE VOLTAGE:

PATH: SETTINGS S2 SYSTEM SETUP
[]
SYSTEM
MESSAGE
MESSAGE
350"
"330"

VOLTAGE SENSING
VT CONNECTION TYPE:
None
ENABLE SINGLE VT
OPERATION: OFF
VOLTAGE TRANSFORMER
RATIO: 35.00:1
MOTOR NAMEPLATE
VOLTAGE: 4000 V
indicates that no voltage measurement is
settings is seen only if the
must be chosen such that the secondary
or rated voltage, where
"Open Delta"
"4160"

POWER SYSTEM
NOMINAL SYSTEM
FREQUENCY: 60 Hz
SYSTEM PHASE
SEQUENCE: ABC
SPEED2 PHASE
SEQUENCE: ABC
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
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
VT CONNECTION TYPE
MOTOR NAMEPLATE
MOTOR NAMEPLATE
Range: 50 Hz, 60 Hz, Variable
Range: ABC, ACB
Range: ABC, ACB
is