Introduction; Overview; Description - GE 489 Instruction Manual

1 INTRODUCTION

1 INTRODUCTION 1.1 OVERVIEW
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.
12 overspeed
21 distance
24 volts/hertz
27 undervoltage
inadvertent generator energization
50/27
reverse power/low forward power
32
38 bearing overtemperature (RTD)
bearing vibration (analog inputs)
39
loss of excitation (impedance)
40
loss of field (reactive power)
40Q
46 negative sequence overcurrent (I t)
47 voltage phase reversal
stator thermal (RTD/thermal model)
49
high-set phase overcurrent
50
50BF breaker failure detection
50 offline overcurrent
50/51GN ground overcurrent
51V voltage restrained phase overcurrent
59
overvoltage
59GN/27TN 100% stator ground
60FL VT fuse failure
ground directional
67
76 overexcitation (analog input)
81 overfrequency/underfrequency
electrical lockout
86
percentage differential
87G
sequential tripping logic
trip coil supervision
generator running hours alarm
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
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:
GE Power Management
41
2
2
39
76
Figure 1–1: SINGLE LINE DIAGRAM
key before the trip is reset, or by accessing the last trip data in actual values page 1.
NEXT
489 Generator Management Relay
Trip Coil
52
Supervision
38
12
GENERATOR
49
50
67 50/51GN
59GN

1.1 OVERVIEW

1.1.1 DESCRIPTION

489
27
47
59
810
81U
40
24
21
32
40Q
50/27
51V
60FL
Output
46
relays
Output
49
6
86
relays
50BF
87G
RS232
RS485
RS485
Analog
+ 4
outputs
-
27TN
Analog
+ 4
-
inputs
808783E6.CDR
1-1
1