Date Code 20080103 Instruction Manual SEL-351S Relay
Table of Contents
List of Tables.......................................................................................................................................................................... v
List of Figures......................................................................................................................................................................ix
Preface.................................................................................................................................................................................... xv
Section 1: Introduction and Specifications
SEL-351S Models ........................................................................................................................................... 1.2
Applications..................................................................................................................................................... 1.5
Hardware Connection Features ....................................................................................................................... 1.6
Communications Connections......................................................................................................................... 1.9
Specifications ................................................................................................................................................ 1.10
Section 2: Installation
Relay Mounting............................................................................................................................................... 2.1
Front-Panel and Rear-Panel Connection Diagrams......................................................................................... 2.3
User-Configurable Label Option for the Front Panel...................................................................................... 2.9
Making Rear-Panel Connections................................................................................................................... 2.14
SEL-351S AC/DC Connection Diagrams for Various Applications............................................................. 2.25
Circuit Board Connections ............................................................................................................................ 2.40
Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements
Instantaneous/Definite-Time Overcurrent Elements ....................................................................................... 3.1
Time-Overcurrent Elements .......................................................................................................................... 3.17
Voltage Elements ........................................................................................................................................... 3.28
Synchronism Check Elements....................................................................................................................... 3.36
Frequency Elements ...................................................................................................................................... 3.49
Voltage Sag, Swell, and Interruption Elements (Available in Firmware Version 7) ..................................... 3.54
Power Elements (Available in Firmware Version 7) ..................................................................................... 3.59
Section 4: Loss-of-Potential, Load Encroachment, and Directional Element Logic
Loss-of-Potential Logic................................................................................................................................... 4.1
Load-Encroachment Logic .............................................................................................................................. 4.4
Directional Control for Neutral Ground and Residual Ground Overcurrent Elements................................... 4.9
Directional Control for Negative-Sequence and Phase Overcurrent Elements ............................................. 4.31
Directional Control Settings.......................................................................................................................... 4.39
Directional Control Provided by Torque Control Settings ............................................................................ 4.58
Section 5: Trip and Target Logic
Trip Logic ........................................................................................................................................................ 5.1
Switch-Onto-Fault (SOTF) Trip Logic............................................................................................................ 5.8
Communications-Assisted Trip Logic—General Overview.......................................................................... 5.11
Permissive Overreaching Transfer Trip (POTT) Logic ................................................................................. 5.15
Directional Comparison Unblocking (DCUB) Logic.................................................................................... 5.21
Directional Comparison Blocking (DCB) Logic........................................................................................... 5.27
Front-Panel Target LEDs............................................................................................................................... 5.32
Section 6: Close and Reclose Logic
Close Logic...................................................................................................................................................... 6.2
Reclose Supervision Logic.............................................................................................................................. 6.7
Reclosing Relay............................................................................................................................................. 6.14
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