Date Code 20080213 Instruction Manual SEL-351A Relay
Table of Contents
List of Tables ........................................................................................................................................................ v
List of Figures..................................................................................................................................................... ix
Preface ................................................................................................................................................................. xv
Section 1: Introduction and Specifications
Overview ......................................................................................................................................................... 1.1
SEL-351A Models........................................................................................................................................... 1.2
Applications..................................................................................................................................................... 1.6
Hardware Connection Features ....................................................................................................................... 1.7
Communications Connections......................................................................................................................... 1.9
Specifications ................................................................................................................................................ 1.10
Section 2: Installation
Overview ......................................................................................................................................................... 2.1
Relay Mounting............................................................................................................................................... 2.2
Front-Panel and Rear-Panel Connection Diagrams......................................................................................... 2.4
Making Rear-Panel Connections................................................................................................................... 2.10
SEL-351A AC/DC Connection Diagrams for Various Applications ............................................................ 2.20
Circuit Board Connections ............................................................................................................................ 2.34
Section 3: Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Instantaneous/Definite-Time Overcurrent Elements ....................................................................................... 3.1
Time-Overcurrent Elements .......................................................................................................................... 3.16
Voltage Elements ........................................................................................................................................... 3.28
Synchronism Check Elements (Not in SEL-351A-1) ................................................................................... 3.36
Frequency Elements ...................................................................................................................................... 3.49
Section 4: Loss-of-Potential, Load Encroachment, and Directional Element Logic
Loss-of-Potential Logic (Not in the SEL-351A-1).......................................................................................... 4.1
Load-Encroachment Logic (Not in SEL-351A-1)........................................................................................... 4.4
Directional Control for Neutral-Ground and Residual-Ground
Overcurrent Elements (Not in SEL-351A-1) ................................................................................................ 4.9
Directional Control for Negative-Sequence and Phase Overcurrent Elements (Not in SEL-351A-1).......... 4.30
Directional Control Settings (Not in SEL-351A-1)....................................................................................... 4.38
Directional Control Provided by Torque Control Settings (Not in SEL-351A-1)......................................... 4.57
Section 5: Trip and Target Logic
Trip Logic........................................................................................................................................................ 5.1
Switch-Onto-Fault (SOTF) Trip Logic............................................................................................................ 5.7
Front-Panel Target LEDS .............................................................................................................................. 5.10
Section 6: Close and Reclose Logic
Overview ......................................................................................................................................................... 6.1
Close Logic...................................................................................................................................................... 6.2
Reclose Supervision Logic .............................................................................................................................. 6.5
Reclosing Relay............................................................................................................................................. 6.12
Section 7: Inputs, Outputs, Timers, and Other Control Logic
Overview ......................................................................................................................................................... 7.1
Optoisolated Inputs.......................................................................................................................................... 7.2
Local Control Switches (Only on Models With LCD).................................................................................... 7.5
Remote Control Switches ................................................................................................................................ 7.9
Latch Control Switches ................................................................................................................................. 7.11
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