Time Overcurrent Curves; Ansi Curves - GE Multilin 489 Instruction Manual

CHAPTER A: APPENDIX
A.4

Time Overcurrent Curves

A.4.1

ANSI Curves

489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
GE Multilin
1000
100
10
1
0.1
0.01
1
0.1
FIGURE A–8: ANSI Moderately Inverse Curves
489 ANSI
MODERATELY INVERSE
MULTIPLIER
30.0
20.0
1 .0
10.0
8.0
6.0
4.0
3.0
2.0
1.0
0.
10
CURRENT (I/Ipu)
100
808802A4.CDR
A–15