5-52
F650 DIGITAL BAY CONTROLLER
GEK-106310-AF
5.4 PROTECTION ELEMENTS
CHAPTER 5: SETPOINTS
5.4.2.4 ANSI curves
This family of curves complies with the American Standard ANSI C37.90 for Extremely inverse, Very inverse, Normally
inverse and Moderately inverse curves. The formulas that define these curves are as follows:
where:
T = Operation time (in seconds).
Dial = Multiplying factor
I = Input current
I
pickup
= Current pickup setting
A, B, C, D, E = Constants
T
reset
= Reset time (in seconds) assuming a 100% of power capacity and that the reset is activated
T
r
= Characteristic constant
The different constants that define the above-mentioned curves are:
Table 5-27: Constants for ANSI curves
0.5
0.578
0.375
0.266
0.221
0.196
0.180
0.168
0.160
0.154
0.148
1.0
1.155
0.749
0.532
0.443
0.392
0.360
0.337
0.320
0.307
0.297
2.0
2.310
1.499
1.064
0.885
0.784
0.719
0.674
0.640
0.614
0.594
4.0
4.621
2.997
2.128
1.770
1.569
1.439
1.348
1.280
1.229
1.188
6.0
6.931
4.496
3.192
2.656
2.353
2.158
2.022
1.921
1.843
1.781
8.0
9.242
5.995
4.256
3.541
3.138
2.878
2.695
2.561
2.457
2.375
10.0
11.552
7.494
5.320
4.426
3.922
3.597
3.369
3.201
3.072
2.969
ANSI Curve Shape
A
B
C
D
E
Tr
ANSI Extremely Inverse
0.0399
0.2294
0.5
3.0094
0.7222
5.67
ANSI Very Inverse
0.0615
0.7989
0.34
-0.284
4.0505
3.88
ANSI Normally Inverse
0.0274
2.2614
0.3
-4.1899
9.1272
5.95
ANSI Moderately Inverse
0.1735
0.6791
0.8
-0.08
0.1271
1.08
Summary of Contents for F650
Page 406: ...6 58 F650 DIGITAL BAY CONTROLLER GEK 106310 AF 6 5 RECORDS CHAPTER 6 ACTUAL VALUES ...
Page 994: ...H 2 F650 DIGITAL BAY CONTROLLER GEK 106310 AF APPENDIX H FACTORY DEFAULT LOGIC ...
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