Date Code 20110408 Instruction Manual SEL-551 Relay
Table of Contents
List of Tables.......................................................................................................................................................................... v
List of Figures.....................................................................................................................................................................vii
Preface..................................................................................................................................................................................... ix
Manual Overview .............................................................................................................................................. ix
Conventions ........................................................................................................................................................ x
Section 1: Introduction and Specifications
Overview ......................................................................................................................................................... 1.1
SEL-551 Model Changes ................................................................................................................................ 1.2
SEL-551 Applications ..................................................................................................................................... 1.2
Hardware Overview......................................................................................................................................... 1.3
Specifications .................................................................................................................................................. 1.4
Overcurrent Elements...................................................................................................................................... 1.6
CT Saturation Protection ................................................................................................................................. 1.7
Timer Specifications........................................................................................................................................ 1.8
Section 2: Installation
Overview ......................................................................................................................................................... 2.1
Relay Mounting............................................................................................................................................... 2.1
Rear-Panel Connections .................................................................................................................................. 2.5
SEL-551 AC/DC Connection Diagrams for Example Applications ............................................................... 2.9
EIA-485 Rear-Panel Adapter......................................................................................................................... 2.14
Circuit Board Jumpers and Battery ............................................................................................................... 2.15
Section 3: Relay Elements and Logic
Relay Word Bits and SELOGIC Control Equations.......................................................................................... 3.1
Optoisolated Inputs.......................................................................................................................................... 3.3
Local Control Switches ................................................................................................................................... 3.5
Remote Control Switches ................................................................................................................................ 3.7
Instantaneous Overcurrent Elements............................................................................................................... 3.8
Time-Overcurrent Elements .......................................................................................................................... 3.12
Trip Logic ...................................................................................................................................................... 3.17
Close Logic.................................................................................................................................................... 3.20
Reclosing Relay............................................................................................................................................. 3.22
SEL
OGIC Control Equation Variables/Timers ............................................................................................... 3.38
Output Contacts............................................................................................................................................. 3.39
Demand Ammetering .................................................................................................................................... 3.41
Front-Panel Target LEDs............................................................................................................................... 3.47
Section 4: Setting the Relay
Overview ......................................................................................................................................................... 4.1
Settings Changes Via the Front Panel ............................................................................................................. 4.1
Settings Changes Via the Serial Port............................................................................................................... 4.1
Time-Overcurrent Element Setting Reference Information ............................................................................ 4.2
Relay Word Bit Setting Reference Information ............................................................................................ 4.14
Settings Explanations .................................................................................................................................... 4.18
Settings Sheets............................................................................................................................................... 4.20
Settings Sheets for the SEL-551 Relay
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