Schweitzer Engineering Laboratories SEL-321 - Section 2: Specifications

Date Code 20011026 Specifications i
SEL-321/321-1 Instruction Manual
TABLE OF CONTENTS
SECTION 2: SPECIFICATIONS .............................................................2-1
Overview.......................................................................................................................................2-1
Setting Structure ...........................................................................................................................2-1
Line and Relay Terminal Information ..........................................................................................2-1
Enabling Distance Zones ..............................................................................................................2-2
Element Label Comment ......................................................................................................2-2
Setting the Direction of Zones and Overcurrent Elements...........................................................2-2
Phase Mho Distance Characteristics.............................................................................................2-2
Ground Mho and Quadrilateral Distance Characteristics.............................................................2-3
Out-of-Step (OOS) Characteristics...............................................................................................2-3
Load-Encroachment Characteristics.............................................................................................2-4
Negative-Sequence Directional Characteristics ...........................................................................2-5
Time-Overcurrent Elements (SEL-321 Base Version).................................................................2-5
Time-Overcurrent Elements (SEL-321-1 Relay Only).................................................................2-6
Instantaneous/Definite-Time Overcurrent Elements: Levels 1 - 4 ..............................................2-7
Additional Voltage Elements........................................................................................................2-7
Phase Voltage Elements........................................................................................................2-8
Zero-Sequence Overvoltage Element ...................................................................................2-8
Positive-Sequence Overvoltage Elements ............................................................................2-8
Time-Step Backup Logic Timers..................................................................................................2-8
Communications-Assisted Tripping Schemes..............................................................................2-9
Permissive Overreaching Transfer Trip (POTT) Logic........................................................2-9
Directional Comparison Unblocking (DCUB) Logic .........................................................2-10
Directional Comparison Blocking (DCB) Logic ................................................................2-11
Creating Other Tripping Schemes ......................................................................................2-12
Permissive Underreaching Transfer Trip Schemes.....................................................2-12
Direct Underreaching Transfer Trip Schemes ............................................................2-12
Direct Transfer Trip Schemes.....................................................................................2-12
Other Logic.................................................................................................................................2-13
Zone 1 Extension (Z1X) Scheme Logic .............................................................................2-13
Remote-End-Just-Opened (REJO) Logic............................................................................2-13
Switch-Onto-Fault (SOTF) Logic.......................................................................................2-14
Loss-of-Potential (LOP) Logic ...........................................................................................2-14
Pole-Discordance Logic......................................................................................................2-15
Pole Open Logic .................................................................................................................2-16
Stub Protection Logic .........................................................................................................2-16
Trip Coil Monitor (TCM) Logic.........................................................................................2-17
Close Logic .........................................................................................................................2-17
Trip Suspicion Logic ..........................................................................................................2-17
Fault Identification Selection (FIDS) Logic .......................................................................2-18
Open Phase Alarm Logic ....................................................................................................2-18
Contact Input Assignments .................................................................................................2-18
SELOGIC
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Control Equations .....................................................................................................2-20
Equation Programming .......................................................................................................2-22
SELOGIC Control Equation Operator Order of Operations ........................................2-23