Schweitzer Engineering Laboratories SEL-251 - Table of Contents

Date Code 970103 Table of Contents i
SEL-251, -2, -3 Instruction Manual
TABLE OF CONTENTS
SECTION 1: INTRODUCTION 1-1
Getting Started.............................................................................................................................. 1-1
Overview ...................................................................................................................................... 1-1
Conventional Terminal Block Model................................................................................... 1-1
Plug-In Connector Model..................................................................................................... 1-2
General Description: Conventional Terminal Block Model....................................................... 1-2
SELOGIC Control Equations: The Next Step in Programmable Relay Logic ..................... 1-2
Phase, Ground, and Negative-Sequence Overcurrent Protection......................................... 1-2
Sophisticated Multiple-Shot Reclosing Relay Includes Reset Inhibit and Sequence
Coordination................................................................................................................. 1-3
Six Selectable Groups of Settings and Logic....................................................................... 1-3
Circuit Breaker Monitor Tracks Breaker Performance and Helps Maintenance
Planning........................................................................................................................ 1-3
Fault Locator Reduces Line Patrol and Outage Time.......................................................... 1-3
Analyze Operations Using Event Reports............................................................................ 1-3
Comprehensive Metering Supports Protection, Operation, and Demand Analysis ............. 1-3
Access SEL-251 Relay Information via the SEL-RD Relay Display................................... 1-4
General Description: Plug-In Connector Model ......................................................................... 1-4
Wiring Harnesses ................................................................................................................. 1-4
High Current Interrupting Output Contacts.......................................................................... 1-4