Sel 551 Overcurrent Relay Manuals

Table of Contents

3

List of Tables

7

Preface

11

Manual Overview
11
Conventions
12

Section 1: Introduction and Specifications

13

Section 2: Installation

21

Overview
21
Relay Mounting
21
Figure 2.1 SEL-551 Dimensions, Panel Cutout, and Drill Plan
22
Figure 2.2 Relay Dimensions and Drill Plan for Mounting Two SEL-500 Series Relays Together Using Mounting Block (SEL P/N 9101)
23
Figure 2.3 Relay Dimensions and Drill Plan for Mounting an SEL-551 with Rack Mount Bracket 9100 (Bracket on Right Side in Front View)
24
Figure 2.4 SEL-551 Fitted with Mounting Bracket (SEL P/N 9100) for Mounting in 19-Inch Rack
24
Rear-Panel Connections
25
Figure 2.5 SEL-551 Front Panel, Rack-Mount Version (Half-Rack Width)
25
Figure 2.6 SEL-551 Front Panel, Panel-Mount Version
25
Figure 2.7 SEL-551 Rear Panel (Conventional Terminal Blocks Option)
26
Figure 2.8 SEL-551 Rear Panel (Plug-In Connectors Option)
27
AC/DC Connection Diagrams for Example Applications
29
Figure 2.9 SEL-551 Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder (Includes Fast Bus Trip Scheme)
29
Figure 2.10 SEL-551 Provides Overcurrent Protection for an Industrial Distribution Feeder (Core-Balance Current Transformer Connected to Current Input Channel IN)
30
Figure 2.11 SEL-551 Provides Overcurrent Protection for a Delta-Wye Transformer Bank
31
Figure 2.12 SEL-551 Provides Overcurrent Protection for a Transformer Bank with a Tertiary Winding
32
Figure 2.13 SEL-551 Provides Overcurrent Protection for a Distribution Bus (Includes Fast Bus Trip Scheme)
33
EIA-485 Rear-Panel Adapter
34
Figure 2.14 SEL-551 Provides Dedicated Breaker Failure Protection
34
Circuit Board Jumpers and Battery
35
Table 2.1 Required Control Voltage Jumper Positions for Applied Nominal Control Voltage (SEL-551 with the Conventional Terminal Blocks Option)
35
Figure 2.15 Input and Output Jumper Locations (SEL-551 Relay with the Conventional Terminal Blocks with Jumper-Selectable Control Input Voltage Option)
36
Table 2.2 Required Position of Jumper JMP13 for Desired Output Contact OUT4 Operation
37
Figure 2.16 Output Contact OUT4 Control Jumper Location
37
Section 3: Relay Elements and Logic Relay Word Bits and SEL OGIC Control Equations
40

Section 4: Setting the Relay

87

Settings Sheets for the SEL-551 Relay

107

Section 5: Serial Port Communications and Commands

119

Command Summary

146

Section 6: Front-Panel Interface

147

Section 7: Standard Event Reports and SER

161

Section 8: Testing and Troubleshooting

179

Appendix A: Firmware and Manual Versions Firmware

198

Table A.2 Instruction Manual Revision History
199

Appendix B: Firmware Upgrade Instructions EPROM Firmware Upgrades

208

Appendix C: SEL Distributed Port Switch Protocol

215

Appendix D: Configuration, Fast Meter, and Fast Operate Commands

217

Appendix E: Compressed ASCII Commands

225

Appendix F: Setting Negative-Sequence Overcurrent Elements

229

Appendix G: Modbus RTU Communications Protocol

237

SEL 551 Overcurrent Relay Manuals

SEL 551 Instruction Manual (268 pages)

Table of Contents

List of Tables

Preface

Section 1: Introduction and Specifications

Section 2: Installation

Section 4: Setting the Relay

Settings Sheets for the SEL-551 Relay

Section 5: Serial Port Communications and Commands

Command Summary

Section 6: Front-Panel Interface

Section 7: Standard Event Reports and SER

Section 8: Testing and Troubleshooting

Appendix A: Firmware and Manual Versions Firmware

Appendix B: Firmware Upgrade Instructions EPROM Firmware Upgrades

Appendix C: SEL Distributed Port Switch Protocol

Appendix D: Configuration, Fast Meter, and Fast Operate Commands

Appendix E: Compressed ASCII Commands

Appendix F: Setting Negative-Sequence Overcurrent Elements

Appendix G: Modbus RTU Communications Protocol

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