GE Multilin 489 User Manual

CHAPTER 6: ACTUAL VALUES
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 6–17
All measured current values are displayed here. A, B, C AMPS represent the output side CT
measurements:
A, B, C NEUT. AMPS the neutral end CT measurements, and A, B, C DIFF. AMPS
the differential operating current calculated as the vector difference between the output
side and the neutral end CT measurements on a per phase basis. The 489 negative-
sequence current is defined as the ratio of negative-sequence current to generator rated
FLA, I
2
/FLA× 100%. The generator full load amps is calculated as: generator rated MVA /
( × generator phase-to-phase voltage). Polar coordinates for measured currents are
also shown using Va (wye connection) or Vab (open delta connection) as a zero angle
reference vector. In the absence of a voltage signal (Va or Vab), the IA output current is
used as the zero angle reference vector.
6.3.2 Voltage Metering
PATH: ACTUAL VALUES ZV A2 METERING DATA ZV VOLTAGE METERING
3

VOLTAGE [Z]
Vab: 0 Vbc: 0
Vca: 0 Volts
Range: 0 to 50000 V. Not seen if VT
CONNECTION
is “None”.
MESSAGE
AVERAGE LINE
VOLTAGE: 0 Volts
Range: 0 to 50000 V. Not seen if VT
CONNECTION
is “None”.
MESSAGE
Van: 0 Vbn: 0
Vcn: 0 Volts
Range: 0 to 50000 V. Not seen if VT
CONNECTION
is “Wye”.
MESSAGE
AVERAGE PHASE
VOLTAGE: 0 Volts
Range: 0 to 50000 V. Not seen if VT
CONNECTION
is “Wye”.
MESSAGE
LINE A-B VOLTAGE:
0 V 0° Lag
Range: 0 to 50000 V, 0 to 359°. Not
seen if
VT CONNECTION is
“None”.
MESSAGE
LINE B-C VOLTAGE:
0 V 0° Lag
Range: as above
MESSAGE
LINE C-A VOLTAGE:
0 V 0° Lag
Range: as above
MESSAGE
PHASE A-N VOLTAGE:
0 V 0° Lag
Range: 0 to 50000 V, 0 to 359°. Not
seen if
VT CONNECTION is
“Wye”.
MESSAGE
PHASE B-N VOLTAGE:
0 V 0° Lag
Range: as above
MESSAGE
PHASE C-N VOLTAGE:
0 V 0° Lag
Range: as above
MESSAGE
PER UNIT MEASUREMENT
OF V/Hz: 0.00
Range: 0.00 to 2.00. Not seen if VT
CONNECTION
is “None”.
MESSAGE
FREQUENCY:
0.00 Hz
Range: 0.00 to 90.00 Hz. Not seen if VT
CONNECTION
is “None”.
MESSAGE
NEUTRAL VOLTAGE
FUND: 0.0 V
Range: 0.0 to 25000.0 V. Seen only if
there is a neutral VT.
Courtesy of NationalSwitchgear.com

GE Multilin 489 Specifications

General

Brand	GE
Model	Multilin 489
Category	Relays
Language	English