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GE Multilin 489 Generator Management Relay 1-1
1 INTRODUCTION 1.1 OVERVIEW
1
1 INTRODUCTION 1.1OVERVIEW 1.1.1 DESCRIPTION
The 489 Generator Management Relay is a microprocessor-based relay designed for the protection and management of
synchronous and induction generators. The 489 is equipped with 6 output relays for trips and alarms. Generator protection,
fault diagnostics, power metering, and RTU functions are integrated into one economical drawout package. The single line
diagram below illustrates the 489 functionality using ANSI (American National Standards Institute) device numbers.
Figure 1–1: SINGLE LINE DIAGRAM
Fault diagnostics are provided through pretrip data, event record, waveform capture, and statistics. Prior to issuing a trip,
the 489 takes a snapshot of the measured parameters and stores them in a record with the cause of the trip. This pre-trip
data may be viewed using the key before the trip is reset, or by accessing the last trip data in actual values page 1.
The event recorder stores a maximum of 40 time and date stamped events including the pre-trip data. Every time a trip
occurs, the 489 stores a 16 cycle trace for all measured AC quantities. Trip counters record the number of occurrences of
each type of trip. Minimum and maximum values for RTDs and analog inputs are also recorded. These features allow the
operator to pinpoint a problem quickly and with certainty.
A complete list protection features may be found below in the table below:
87G
27TN59GN
49
50
46
86
49
12
38
50BF
Output
relays
Trip Coil
Supervision
RS485
RS485
Analog
inputs
Analog
output
s
Output
relays
489
RS232
+
+
-
-
4
4
6
52
GENERATOR
41
39
76
50/51GN
60FL
51V
50/27
32
21
40
40Q
24
59
810
81U
27
47
67
12 overspeed
volts/hertz
undervoltage
inadvertent generator energization
reverse power/low forward power
bearing overtemperature (RTD)
bearing vibration (analog inputs)
loss of field (reactive power)
negative sequence overcurrent (I t)
2
2
voltage phase reversal
stator thermal (RTD/thermal model)
breaker failure detection
offline overcurrent
ground overcurrent
voltage restrained phase overcurrent
overvoltage
100% stator ground
VT fuse failure
overexcitation (analog input)
overfrequency/underfrequency
percentage differential
electrical lockout
ground directional
high-set phase overcurrent
loss of excitation (impedance)
distance
sequential tripping logic
trip coil supervision
24
27
50/27
32
38
39
40Q
46
47
49
50BF
50
50/51GN
51V
59
59GN/27TN
60FL
76
81
87G
86
67
50
40
21
Synchronous
Induction
generator running hours alarm
808783E8.CDR
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