9328900990 Rev L BE1-951 Protection and Control i
SECTION 4 • PROTECTION AND CONTROL
TABLE OF CONTENTS
SECTION 4 • PROTECTION AND CONTROL......................................................................................... 4-1
INTRODUCTION.................................................................................................................................... 4-1
Using Protection and Control Functions............................................................................................. 4-1
SETTING GROUPS............................................................................................................................... 4-1
BESTlogic Settings for Setting Group Control ................................................................................... 4-2
Automatic Setting Group Control........................................................................................................ 4-5
Automatic Control by Monitoring Line Current................................................................................ 4-5
Group Control by Monitoring Reclose Status ................................................................................. 4-7
Group Control by Monitoring Fuse Loss Status.............................................................................. 4-9
Operating Settings for Setting Group Control .................................................................................... 4-9
Logic Override of the Setting Group Control Function..................................................................... 4-11
Retrieving Setting Group Control Status from the Relay ................................................................. 4-12
OVERCURRENT PROTECTION......................................................................................................... 4-12
50T - Instantaneous Overcurrent Protection with Settable Time Delay........................................... 4-12
BESTlogic Settings for Instantaneous Overcurrent...................................................................... 4-13
Operating Settings for Instantaneous Overcurrent....................................................................... 4-14
Retrieving Instantaneous Overcurrent Status from the Relay...................................................... 4-16
51 - Time Overcurrent Protection..................................................................................................... 4-16
BESTlogic Settings for Time Overcurrent..................................................................................... 4-17
Operating Settings for Time Overcurrent...................................................................................... 4-18
Voltage Restraint/Control for Time Overcurrent Protection .............................................................4-19
Operating Settings for Voltage Restraint/Control for Time Overcurrent....................................... 4-20
Programmable Curves ..................................................................................................................... 4-21
Setting Programmable Curves...................................................................................................... 4-22
46 Curve ....................................................................................................................................... 4-23
67 - Directional Overcurrent Protection............................................................................................ 4-23
Internal Polarization Methods ....................................................................................................... 4-23
Polarizing Settings for 67N Directional Overcurrent Element....................................................... 4-24
Negative-Sequence Overcurrent Protection .................................................................................... 4-26
Negative-Sequence Pickup Settings ............................................................................................ 4-26
Negative-Sequence Coordination Settings................................................................................... 4-27
Delta/Wye Transformer Application.............................................................................................. 4-28
Generator Application................................................................................................................... 4-28
DIRECTIONAL POWER PROTECTION .............................................................................................4-29
32 - Directional Power Protection..................................................................................................... 4-29
BESTlogic Settings for Directional Power .................................................................................... 4-29
Operating Settings for Directional Power ..................................................................................... 4-30
VOLTAGE PROTECTION ................................................................................................................... 4-32
24 - Volts per Hertz Overexcitation Protection................................................................................. 4-32
BESTlogic Settings for Volts per Hertz Overexcitation................................................................. 4-33
Operating Settings Volts per Hertz Overexcitation....................................................................... 4-34
Programmable Alarm for Volts per Hertz Overexcitation ............................................................. 4-35
27P/59P - Phase Undervoltage/Overvoltage Protection.................................................................. 4-36
BESTlogic Settings for Phase Undervoltage/Overvoltage ........................................................... 4-36
Operating Settings for Phase Undervoltage/Overvoltage ............................................................ 4-38
27X/59X - Auxiliary Undervoltage/Overvoltage Protection .............................................................. 4-39
BESTlogic Settings for Auxiliary Undervoltage/Overvoltage........................................................ 4-40
Operating Settings for Auxiliary Undervoltage/Overvoltage......................................................... 4-41
47 - Negative-Sequence Overvoltage Protection............................................................................. 4-43
BESTlogic Settings for Negative-Sequence Overvoltage ............................................................ 4-43
Operating Settings for Negative-Sequence Overvoltage ............................................................. 4-44
FREQUENCY PROTECTION.............................................................................................................. 4-46
81 - Over/Under Frequency Protection ............................................................................................ 4-46
BESTlogic Settings for Over/Under Frequency............................................................................ 4-47
Operating Settings for Over/Under Frequency............................................................................. 4-48
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