GE 489 - Manual (Page 237)

GE Multilin 489 Generator Management Relay B-1
APPENDIX B B.1 TIME OVERCURRENT CURVES
B
APPENDIX B CurvesB.1 Time Overcurrent Curves B.1.1 ANSI CURVES
Figure B–1: ANSI MODERATELY INVERSE CURVES
0.01
0.1
1
10
100
1000
0.1 1 10
100
808802A4.CDR CURRENT (I/Ipu)
TR
IP
TIME
(sec)
489 ANSI
MODERATELY INVERSE
0.5
1.0
2.0
3.0
4.0
6.0
8.0
10.0
15.0
20.0
30.0
MULTIPLIER
GE Multilin