IL17569
Page 8-6
Effective June, 2001
Instantaneous Protection
Instantaneous (short circuit) protection reacts to high level fault
currents. The 50P pickup settings establish the current level at
which the FP-5000 picks up on an instantaneous fault. An optional
time delay may be programmed for coordination purposes.
If an Instantaneous Setting other than “Disable” is selected, the
instantaneous portion of the overall curve can be moved indepen-
dently in a horizontal direction.
Figure
8-9
graphically illustrates this
horizontal movement.
Ground Fault Protection
The ground fault protection function can be a composite of the ground:
1. Inverse time overcurrent curve shape pickup and time.
2. 50X-2 and 50R-2 (Short delay) pickup and time.
3. 50X-1 and 50R-1(Instantaneous) pickup.
Its curve shape is independent of the phase curve. The inverse time
overcurrent time multiplier values for the ground function of the
thermal curves are for (1 x I
n
) while the phase function is (3 x I
n
).
Movement of the pickup portion of the curve in a horizontal direction
and the time portion of the curve in a vertical direction is similar to
phase inverse time overcurrent, short delay and instantaneous
functions as previously described. Therefore, the ground fault curve
movement is not graphically illustrated. When programming ground
fault protection, keep in mind that if “Disable” is selected, the ground
fault protection is disabled.
8.3.5 Negative Sequence Current Protection (46)
The FP-5000 provides monitoring and protection based on the
percent of current unbalance or negative sequence. The presence
of negative sequence current identifies either a phase unbalance in
the voltage magnitude or reverse phase rotation condition. The
positive and negative sequence currents are calculated from the
three phase currents. The % unbalance is the ratio of negative
sequence current to positive sequence current (%Unbalance = I
2
/I
1
).
A current unbalance pickup occurs when I
2
/I
1
exceeds the IUB %
Unbalance setting, and I
1
or I
2
magnitude exceeds the IUB
Threshold setting. The Current Unbalance trip is set when the
pickup condition exists for the delay time specified. The current
unbalance pickup and trip is reset when the positive sequence
current drops below the IUB Threshold setting or I
2
/I
1
drops below
the IUB % Unbalance setting minus 1%. The settings associated
with voltage unbalance or negative sequence voltage protection are
listed in Table 8.2.
Figure 8-9. 50P (Instantaneous) Setting Adjustment
Summary of Contents for Cutler-Hammer FP-5000
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...