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Page 8-9
IL17569
Effective June, 2001
8.6 Voltage Functions and Protection
8.6.1 Negative Sequence Voltage Protection (47)
The FP-5000 provides monitoring and protection based on the
percent of voltage unbalance or negative sequence voltage. The
presence of negative sequence voltage identifies either a phase
unbalance or reverse phase rotation condition. The positive and
negative sequence voltages are calculated from the three phase
voltages. The % unbalance is the ratio of negative sequence
voltage to positive sequence voltage (%Unbalance = V
2
/V
1
). A
voltage unbalance pickup occurs when V
2
/V
1
exceeds the VUB %
Unbalance setting and the V
1
or the V
2
magnitude exceeds the VUB
Threshold setting. The Voltage Unbalance trip is set when the
pickup condition exists for the delay time specified. The voltage
unbalance pickup and trip is reset when the positive sequence
voltage drops below the VUB Threshold setting or V
2
/V
1
drops below
the VUB % Unbalance setting minus 1%.
The settings associated with voltage unbalance or negative
sequence voltage protection are listed in Table 8.3 below.
Table 8.3 Negative Sequence Voltage Protection
Parameter
Range
Step
47-1 VUB
1 to 100V,
1 V
Threshold
Disabled
47-1 VUB %
4% to 40%
1%
Unbalance
47-1 VUB
0 to 9999 Cycles
1 Cycle
Delay
47-2 VUB
1 to 100V,
1 V
Threshold
Disabled
47-2 VUB %
4% to 40%
1%
Unbalance
47-2 VUB
0 to 9999 Cycles
1 Cycle
Delay
8.6.2 Undervoltage (27) and Overvoltage (59) Protection
Separate undervoltage and overvoltage protective elements are
provided for the main voltage inputs (V
A
, V
B
, V
C
) and the auxiliary
voltage input (V
X
). Two elements are provided for each function so
alarm and trip levels can be set independently. Each of the voltage
protection functions has a Threshold and a Delay setting. The
optional time delay is provided for coordination with other devices.
An overvoltage pickup occurs when the measured voltage exceeds
the OV Threshold setting. The overvoltage trip flag is set when the
voltage exceeds the threshold setting for the delay time specified.
The overvoltage pickup and trip is reset when the voltage drops
below 98% of the OV Threshold setting.
An undervoltage pickup occurs when the measured voltage drops
below the UV Threshold setting. The undervoltage trip is set when
the voltage stays below the threshold setting for the delay time
specified. The undervoltage pickup and trip is reset when the
voltage raises above 102% of the UV Threshold setting.
The Main OV and UV Pickup and Delay settings apply to all three
phase voltages, V
A
, V
B
and V
C
.
The settings for the voltage protection functions are shown in
Table 8.4.
Table 8.4 Voltage Protection Settings
Parameter
Range
Step
59-M1 Main
10 to 150V,
1V
Overvoltage
Disabled
Threshold
59-M1 Main
0 to 9999 Cycles
1 Cycle
Overvoltage
Delay
59-M2 Main
10 to 150V, Disabled
1V
Overvoltage
Threshold
59-M2 Main
0 to 9999 Cycles
1 Cycle
Overvoltage
Delay
27-M1 Main
10 to 150V,
1 V
Undervoltage
Disabled
Threshold
27-M1 Main
0 to 9999 Cycles
1 Cycle
Undervoltage
Delay
27-M2 Main
10 to 150V,
1 V
Undervoltage
Disabled
Threshold
27-M2 Main
0 to 9999 Cycles
1 Cycle
Undervoltage
Delay
59-A1 Auxiliary
10 to 250V,
1V
Overvoltage
Disabled
Threshold
59-A1 Auxiliary
0 to 9999 Cycles
1 Cycle
Overvoltage
Delay
59-A2 Auxiliary
10 to 250V,
1V
Overvoltage
Disabled
Threshold
59-A2 Auxiliary
0 to 9999 Cycles
1 Cycle
Overvoltage
Delay
27-A1 Auxiliary
10 to 250V,
1 V
Undervoltage
Disabled
Threshold
27-A1 Auxiliary
0 to 9999 Cycles
1 Cycle
Undervoltage
Delay
27-A2 Auxiliary
10 to 250V,
1 V
Undervoltage
Disabled
Threshold
27-A2 Auxiliary
0 to 9999 Cycles
1 Cycle
Undervoltage
Delay
Summary of Contents for 66D2041G01
Page 1: ...IL17569 Effective June 2001 Instructions for FP 5000 Protective Relay ...
Page 7: ...IL17569 Table of Contents 6 Effective June 2001 This page left blank intentionally ...
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 25: ...IL17569 Page 3 6 Effective June 2001 This page left blank intentionally ...
Page 98: ...IL17569 Page 5 50 Effective June 2001 This page left blank intentionally ...
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 ...