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Page 8-3
IL17569
Effective June, 2001
Table 8.1 Constants for Inverse Time Overcurrent Curves
CALCULATED CURVES
Curve Type
P
A
B
t
r
ANSI/IEEE
Moderately Inverse
0.02
0.0515
0.114
4.85
Very Inverse
2
19.61
0.491
21.6
Extremely Inverse
2
28.2
0.1217
29.1
IEC
1
IEC-A
0.02
0.14
0
0.14
IEC-B
1
13.5
0
13.5
IEC-C
2
80
0
80
1
FP-5000 does not directly provide IEC-D, IEC-E and IEC-F curves. In the latest IEC standard, IEC-D, IEC-E and IEC-F are the same as
ANSI Moderately Inverse, Very Inverse and Extremely Inverse, respectively.
8.3.3 Curve Shapes
The FP-5000 Protective Relay provides circuit breakers with an extensive degree of selective coordination potential, and permits curve
shaping over a wide range. The available pickup settings, which are inverse time overcurrent time multiplier settings, and inverse time
overcurrent (phase and ground) curve selections are addressed with respect to their effect on the resultant characteristic curve described
above. The operating characteristics of the relay are graphically represented by time-current characteristic curves shown in
Figure 8-4
, below.
Figure 8-4. FP-5000 Time-Current Characteristic Curves
Summary of Contents for 66D2041G01
Page 1: ...IL17569 Effective June 2001 Instructions for FP 5000 Protective Relay ...
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Page 13: ...IL17569 Page 2 2 Effective June 2001 Figure 2 2 FP 5000 Simple Wye Connected Application ...
Page 14: ...Page 2 3 IL17569 Effective June 2001 Figure 2 3 FP 5000 Simple Open Delta Application ...
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Page 108: ...IL17569 Page 6 10 Effective June 2001 Figure 6 10 Common Ct Wiring Configurations ...
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Page 165: ...IL17569 Page Appendix 6 Effective June 2001 Figure 13 2 ANSI Very Inverse ...
Page 166: ...Page Appendix 7 IL17569 Effective June 2001 Figure 13 3 ANSI Extremely Inverse ...
Page 167: ...IL17569 Page Appendix 8 Effective June 2001 Figure 13 4 IEC A Figure 13 4 IEC A ...
Page 168: ...Page Appendix 9 IL17569 Effective June 2001 Figure 13 5 IEC B ...
Page 169: ...IL17569 Page Appendix 10 Effective June 2001 Figure 13 6 IEC C ...
Page 170: ...Page Appendix 11 IL17569 Effective June 2001 Figure 13 7 IEC ...
Page 171: ...IL17569 Page Appendix 12 Effective June 2001 Figure 13 8 ANSI ...
Page 172: ...Page Appendix 13 IL17569 Effective June 2001 Figure 13 9 Thermal ...
Page 173: ...IL17569 Page Appendix 14 Effective June 2001 Figure 13 10 Phase I4 t ...
Page 174: ...Page Appendix 15 IL17569 Effective June 2001 Figure 13 11 Phase I2 t ...
Page 175: ...IL17569 Page Appendix 16 Effective June 2001 Figure 13 12 Phase It ...
Page 176: ...Page Appendix 17 IL17569 Effective June 2001 Figure 13 13 Phase 12 I4 t ...
Page 177: ...IL17569 Page Appendix 18 Effective June 2001 Figure 13 14 Phase I2 t ...
Page 178: ...Page Appendix 19 IL17569 Effective June 2001 Figure 13 15 Ground IT ...
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Page 187: ...Publication No IL17569 June 2001 Pittsburgh Pennsylvania U S A ...