Ge 489 User Manual Page 231
- Page / 259
- Table of contents
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GE Multilin 489 Generator Management Relay A-3
APPENDIX A A.1 STATOR GROUND FAULT
A
Again the time delay on this element must be coordinated with protection elements downstream, if the generator is
grounded. Refer to Section 4.6.7: Ground Overcurrent on page 4–29 for the range of settings of the pickup levels and the
time delays. The time delay on this element should always be longer than the longest delay on line protection downstream.
Figure A–3: GROUND OVERCURRENT ELEMENT WITH DIFFERENT CURRENT SOURCE SIGNALS
A.1.4 GROUND DIRECTIONAL ELEMENT
The 489 can detect internal stator ground faults using a Ground Directional element implemented using the V
neutral
and the
ground current inputs. The voltage signal is obtained across the grounding impedance of the generator. The ground, or
zero sequence, current is obtained from a core balance CT, as shown below (due to CT inaccuracies, it is generally not
possible to sum the outputs of the conventional phase CTs to derive the generator high-side zero sequence current, for an
impedance-grounded generator).
If correct polarities are observed in the connection of all signals to the relay, the V
neutral
signal will be in phase with the
ground current signal. The element has been provided with a setting allowing the user to change the plane of operation to
cater to reactive grounding impedances or to polarity inversions.
This element’s normal "plane of operation" for a resistor-grounded generator is the 180° plane, as shown in Figure A–4:
Ground Directional Element Polarities and Plane of Operation, for an internal ground fault. That is, for an internal stator-to-
ground fault, the V
o
signal is 180° away from the I
o
signal, if the polarity convention is observed. If the grounding imped-
ance is inductive, the plane of operation will be the 270° plane, again, with the polarity convention shown below. If the polar-
ity convention is reversed on one input, the user will need to change the plane of operation by 180°.
Figure A–4: GROUND DIRECTIONAL ELEMENT POLARITIES AND PLANE OF OPERATION
808736A1.CDR
489
GENERATOR
CORE
BALANCE
CT
CORE
BALANCE
CT
Phase CTs
BREAKER
Breaker
Aux.
Option 2
Option 1
Option 5
(similar to
Option 4)
Option 3
Option 4
Ground
Overcurrent
Element
Ground current input
from one of the five
options
808735A1.CDR
GENERATOR
I
o
CORE
BALANCE
CT
Plane of operation
for resistive
grounding impedance
180°
270°
0°
90°
Grounding
Resistor
Isolating
Transformer
489
Relay
V
o
F10
E10
H10
G10
I
o
I
o
I
o
±
±
- GENERATOR MANAGEMENT RELAY 1
- Instruction Manual 1
- 1. INTRODUCTION 1.1 OVERVIEW 3
- 4. SETPOINTS 4.1 OVERVIEW 3
- 5. ACTUAL VALUES 5.1 OVERVIEW 5
- 7. TESTING 7.1 TEST SETUP 6
- TABLE OF CONTENTS 8
- 27TN59GN 9
- ≥ 2 × CT: ±1% of 20 × CT 12
- LONG-TERM STORAGE 16
- 808704A1.CDR 19
- 2 INSTALLATION 2.1 MECHANICAL 21
- 2.1.5 TERMINAL LOCATIONS 21
- Figure 2–8: TERMINAL LAYOUT 21
- 2.1 MECHANICAL 2 INSTALLATION 22
- Table 2–1: 489 TERMINAL LIST 22
- 2 INSTALLATION 2.2 ELECTRICAL 23
- RTD SENSING 28
- GE Multilin 31
- 2.2 ELECTRICAL 2 INSTALLATION 32
- S3 DIGITAL INPUTS / 33
- SETPOINT 34
- NEW SETPOINT HAS BEEN 35
- 808745A1.CDR 37
- 808744A1.CDR 39
- 32 I 151 A8 .000 41
- 808726A2.CDR 45
- 808730A2.CDR 46
- VOLTAGE LEVEL 47
- CURRENT PHASOR 47
- VOLTAGE PHASOR 47
- CURRENT LEVEL 47
- EVENT SELECT BUTTONS 48
- EVENT LISTING 48
- VIEW DATA 48
- CLEAR EVENTS 48
- ACTIVATE SET 56
- (EQ 4.1) 62
- (EQ 4.2) 63
- S1 489 SETUP Ö 64
- Range: Breaker Auxiliary a 64
- Breaker Auxiliary b 64
- (EQ 4.8) 74
- 808731A1.CDR 75
- (EQ 4.9) 76
- CURRENT VOLTAGE 77
- (EQ 4.10) 78
- (EQ 4.11) 78
- I(multiples of CT) 81
- (multiples of CT) 81
- 808812A3.CDR 82
- (EQ 4.18) 83
- (EQ 4.19) 84
- TIME DELAY SETTING 85
- TO Vneutral OFEACH489 90
- AUXILIARY CONTACT 90
- TO DIGITAL INPUT FOR 90
- NEUTRAL O/V SUPERVISION 90
- GROUNDINGSWITCH 90
- (EQ 4.21) 91
- (EQ 4.22) 91
- (EQ 4.23) 92
- (EQ 4.24) 92
- 808740A1.CDR 94
- (EQ 4.25) 96
- 806827A1.CDR 105
- (EQ 4.26) 107
- (EQ 4.27) 107
- MULTIPLE OF FULL LOAD AMPS 108
- TIME IN SECONDS 108
- (EQ 4.28) 109
- TIME TO TRIP IN SECONDS 110
- THERMAL LIMITS 111
- FOR HIGH INERTIAL LOAD 111
- VOLTAGE DEPENDENT OVERLOAD 112
- (CUSTOM CURVE) 112
- VOLTAGE DEPENDENT 113
- OVERLOAD PROTECTION CURVES 113
- OVERLOAD PROTECTION at 80% V 114
- NEMA GE MULTILIN 115
- Thermal Capacity Used 116
- MOTOR TRIPPED 116
- 100% LOAD 116
- MOTOR STOPPED 116
- 80% LOAD 116
- 808721A1.CDR 118
- Range: On, Off 120
- (EQ 4.37) 123
- (EQ 4.38) 123
- 808738A1.CDR 124
- THIS FEATURE NOT PROGRAMMED 149
- THIS FEA 149
- TURE NOT PROGRAMMED 149
- THIS FEATURE NOT PRO 150
- LAST TRIP DATA: 158
- ACTIVE ALARMS: 158
- START BLOCK 158
- LOCKOUTS: 158
- 6.3.7 489 MEMORY MAP 172
- 6.3.8 MEMORY MAP DATA FORMATS 196
- No Counters Reported 202
- Configurable 202
- 7.1 TEST SETUP 7 TESTING 214
- A2 METERING DATA 218
- TEMPERATURE 218
- 3 PHASE VARIABLE AC TEST SET 224
- (EQ 7.5) 226
- (EQ 7.6) 226
- (EQ 7.7) 226
- 808739A1.CDR 229
- 808736A1.CDR 231
- 808735A1.CDR 231
- 808734A1.CDR 232
- (EQ A.1) 233
- (EQ A.2) 233
- HGF3/HGF5 234
- DIMENSIONS 234
- 808712A1.CDR 236
- 489 ANSI 237
- MODERATELY INVERSE 237
- NORMALLY INVERSE 238
- VERY INVERSE 239
- CURRENT (I/Ipu) 240
- TRIPTIME (sec) 240
- DEFINITE TIME 241
- SHORT INVERSE 242
- IAC INVERSE 243
- EXTREME INVERSE 245
- IEC CURVE A (BS142) 246
- IEC CURVE B (BS142) 247
- IEC CURVE C (BS142) 248
- GE Multilin Relay Warranty 251
- Numerics 253
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