9424200996
14-1
BE1-11
m
Inverse Overcurrent (51) Protection
14 • Inverse Overcurrent (51) Protection
Five inverse overcurrent (51) elements monitor the current applied to the BE1-11
m
. An element can be
configured to protect against overcurrent by monitoring a single- or three-phase system, neutral current,
positive-sequence current, negative-sequence current, ground current, or unbalanced current.
The five, identical inverse overcurrent protection elements are designated 51-1, 51-2, 51-3, 51-4, and 51-
5. Element logic connections are made on the BESTlogic
™
Plus
screen in BESTCOMS
Plus
®
and element
operational settings are configured on the Inverse Overcurrent settings screen in BESTCOMS
Plus
. A
summary of the logic inputs and outputs and operational settings appears at the end of this chapter.
BESTCOMS
Plus
Navigation Path:
Settings Explorer, Protection, Current, Inverse Overcurrent (51)
HMI Navigation Path:
Settings Explorer, Protection, Settings Group x (where x = 0 to 3), Current
Protection, Inverse Overcurrent 51
Element Operation
Inverse overcurrent protection can be used to protect equipment from damage caused by phase failure,
forward/reverse phase sequence, or phase unbalance.
Modes of Protection
Nine modes of protection are available: IA, IB, IC, Three-Phase, 3I0, I1, I2, IG, and Unbalance.
IA, IB, or IC Mode
The inverse overcurrent protection elements include three independent comparators, one for each phase.
Mode selection determines which phase pickup is required to activate protection.
Three-Phase Mode
The inverse overcurrent protection elements include three independent comparators, one for each phase.
Protection is activated when any of the three phases increases above the Pickup setting.
3I0 Mode
3I0 mode provides neutral overcurrent protection in a three-phase system.
I1 Mode
I1 mode provides positive-sequence overcurrent protection in a three-phase system.
I2 Mode
I2 mode provides negative-sequence overcurrent protection in a three-phase system. Refer to the
Negative-Sequence Overcurrent (46) Protection
chapter for more information.
IG Mode
IG mode provides ground fault protection in a three-phase system.
Unbalance Mode
Unbalance mode provides unbalanced current protection. Two methods are available to calculate
unbalanced current. The first method is based on the negative-sequence current divided by the positive-
sequence current while the second method is based on the average current. The calculation method must
be specified on the System Parameters, Sensing Transformers screen in BESTCOMS
Plus
. Refer to the
Configuration
chapter for more information. The unbalance is blocked if the average current of all three
phases is below 25% of full load amps.
Содержание BE1-11m
Страница 8: ...vi 9424200996 Revision History BE1 11m...
Страница 12: ...x 9424200996 Contents BE1 11m...
Страница 21: ...9424200996 1 9 BE1 11m Introduction Figure 1 1 Style Chart...
Страница 22: ...1 10 9424200996 Introduction BE1 11m...
Страница 40: ...3 6 9424200996 Controls and Indicators BE1 11m Figure 3 3 Front Panel Display Setup Screen...
Страница 53: ...9424200996 5 5 BE1 11m Phase Undervoltage 27P Protection Figure 5 3 Phase Undervoltage Settings Screen...
Страница 54: ...5 6 9424200996 Phase Undervoltage 27P Protection BE1 11m...
Страница 56: ...6 2 9424200996 Negative Sequence Voltage 47 Protection BE1 11m...
Страница 61: ...9424200996 7 5 BE1 11m Phase Overvoltage 59P Protection Figure 7 3 Overvoltage Settings Screen...
Страница 62: ...7 6 9424200996 Phase Overvoltage 59P Protection BE1 11m...
Страница 68: ...8 6 9424200996 Auxiliary Overvoltage 59X Protection BE1 11m...
Страница 80: ...12 4 9424200996 Instantaneous Overcurrent 50 Protection BE1 11m...
Страница 84: ...13 4 9424200996 Breaker Failure 50BF Protection BE1 11m...
Страница 91: ...9424200996 14 7 BE1 11m Inverse Overcurrent 51 Protection Figure 14 4 Inverse Overcurrent Settings Screen...
Страница 92: ...14 8 9424200996 Inverse Overcurrent 51 Protection BE1 11m...
Страница 105: ...9424200996 18 3 BE1 11m Power Factor 55 Protection Figure 18 2 Power Factor Settings Screen...
Страница 106: ...18 4 9424200996 Power Factor 55 Protection BE1 11m...
Страница 110: ...19 4 9424200996 Resistance Temperature Detector 49RTD Protection BE1 11m...
Страница 118: ...20 8 9424200996 Thermal Curve 49TC Protection BE1 11m...
Страница 122: ...22 2 9424200996 Starts per Time Interval 66 Protection BE1 11m...
Страница 124: ...23 2 9424200996 Restart Inhibit Protection BE1 11m...
Страница 130: ...25 4 9424200996 Virtual Control Switches 43 BE1 11m Figure 25 3 Virtual Control Switches Settings Screen...
Страница 140: ...28 4 9424200996 Breaker Control Switch 101 BE1 11m...
Страница 148: ...29 8 9424200996 Setting Groups BE1 11m...
Страница 156: ...30 8 9424200996 Metering BE1 11m Figure 30 11 RTD Meter Screen...
Страница 158: ...31 2 9424200996 Digital Points BE1 11m Figure 31 2 Digital Points Monitor Screen...
Страница 177: ...9424200996 34 5 BE1 11m Motor Reporting Figure 34 9 Learned Motor Data Screen...
Страница 178: ...34 6 9424200996 Motor Reporting BE1 11m...
Страница 184: ...35 6 9424200996 Alarms BE1 11m...
Страница 186: ...36 2 9424200996 Differential Reporting BE1 11m...
Страница 196: ...38 4 9424200996 Demands BE1 11m...
Страница 198: ...39 2 9424200996 Load Profile BE1 11m...
Страница 207: ...9424200996 41 5 BE1 11m Trip Circuit Monitor 52TCM Figure 41 6 Trip Circuit Monitor Settings Screen...
Страница 208: ...41 6 9424200996 Trip Circuit Monitor 52TCM BE1 11m...
Страница 212: ...42 4 9424200996 Fuse Loss 60FL BE1 11m...
Страница 218: ...43 6 9424200996 BESTnet Plus BE1 11m Figure 43 8 Power Quality Page...
Страница 221: ...9424200996 44 3 BE1 11m Mounting Figure 44 3 Case Side Dimensions...
Страница 227: ...9424200996 44 9 BE1 11m Mounting Figure 44 9 Retrofit Mounting Plate Basler P N 9424200073 Part 2...
Страница 235: ...9424200996 45 5 BE1 11m Terminals and Connectors Figure 45 7 Example of Reversed CT Polarity...
Страница 236: ...45 6 9424200996 Terminals and Connectors BE1 11m...
Страница 269: ...9424200996 48 15 BE1 11m BESTlogic Plus Figure 48 4 Logic Page 1 for Default Logic...
Страница 288: ...49 10 9424200996 Communication BE1 11m Figure 49 14 Modbus Mapping Screen...
Страница 301: ...9424200996 51 5 BE1 11m Timekeeping Figure 51 3 Front Panel Circuit Board Backup Battery Location...
Страница 306: ...52 4 9424200996 Device Information BE1 11m...
Страница 314: ...53 8 9424200996 Configuration BE1 11m Figure 53 3 Display Units Screen...
Страница 318: ...54 4 9424200996 Introduction to Testing BE1 11m...
Страница 330: ...56 6 9424200996 Commissioning Testing BE1 11m...
Страница 336: ...58 4 9424200996 Phase Undervoltage 27P Test BE1 11m...
Страница 340: ...59 4 9424200996 Phase Overvoltage 59P Test BE1 11m...
Страница 352: ...60 12 9424200996 Auxiliary Overvoltage 59X Test BE1 11m...
Страница 360: ...61 8 9424200996 Frequency 81 Test BE1 11m...
Страница 364: ...62 4 9424200996 Instantaneous Undercurrent 37 Test BE1 11m...
Страница 376: ...63 12 9424200996 Instantaneous Overcurrent 50 Test BE1 11m...
Страница 396: ...65 16 9424200996 Inverse Overcurrent 51 Test BE1 11m...
Страница 408: ...67 6 9424200996 Power 32 Test BE1 11m...
Страница 412: ...68 4 9424200996 Loss of Excitation Reverse Var Based 40Q Test BE1 11m...
Страница 426: ...70 10 9424200996 Thermal Curve 49TC Test BE1 11m...
Страница 432: ...72 4 9424200996 Starts per Time Interval 66 Test BE1 11m...
Страница 436: ...73 4 9424200996 Restart Inhibit Test BE1 11m...
Страница 440: ...74 4 9424200996 Virtual Control Switches 43 Test BE1 11m...
Страница 450: ...75 10 9424200996 Logic Timers 62 Test BE1 11m...
Страница 464: ...79 8 9424200996 Troubleshooting BE1 11m...
Страница 480: ...80 16 9424200996 Specifications BE1 11m...
Страница 496: ...82 8 9424200996 Time Curve Characteristics BE1 11m Figure 82 3 Time Characteristic Curve A Standard Inverse BS 142...
Страница 497: ...9424200996 82 9 BE1 11m Time Curve Characteristics Figure 82 4 Time Characteristic Curve A1 Inverse IEC 60255 151 Ed 1...
Страница 504: ...82 16 9424200996 Time Curve Characteristics BE1 11m Figure 82 11 Time Characteristic Curve G Long Time Inverse BS 142...
Страница 507: ...9424200996 82 19 BE1 11m Time Curve Characteristics Figure 82 14 Time Characteristic Curve B Very Inverse BS 142...
Страница 512: ...82 24 9424200996 Time Curve Characteristics BE1 11m Figure 82 19 Time Characteristic Curve C Extremely Inverse BS 142...
Страница 570: ...84 26 9424200996 Settings Calculation Examples BE1 11m Figure 84 31 Time vs Current and Thermal Limit Curves...
Страница 597: ...9424200996 84 53 BE1 11m Settings Calculation Examples Figure 84 67 Logic Page 1 Unchanged from Induction Motor Default...
Страница 598: ...84 54 9424200996 Settings Calculation Examples BE1 11m Figure 84 68 Logic Page 2 Unbalance Trip and Alarm Added...
Страница 599: ...9424200996 84 55 BE1 11m Settings Calculation Examples Figure 84 69 Logic Page 3 Power Factor 55 Added...
Страница 600: ...84 56 9424200996 Settings Calculation Examples BE1 11m Figure 84 70 Logic Page 4 Part 1...
Страница 602: ...84 58 9424200996 Settings Calculation Examples BE1 11m...
Страница 608: ...85 6 9424200996 BESTCOMSPlus Settings Loader Tool BE1 11m...
Страница 609: ......