Instruction Manual
Table Of Contents
- Major Features and Benefits
- Functional Overview
- System Overview
- Application Examples
- Collect Fault Information From Remote Branches
- Improve Fuse Coordination
- Fuse-Blowing Scheme Shortcomings
- Improve Fuse-Blowing Schemes With the Fault Transmitter and Receiver System
- Fuse-Saving Combined With Fuse-Blowing Schemes
- Improve Feeder Cable First-Span Protection
- Implement a Low-Cost Fast Bus-Tripping Scheme
- Tripping the Right Recloser Faster
- Safety Information
- Network Deployment Overview
- Device Installation
- Dimensions
- Specifications
- Appendix A: Manual Versions
- Appendix B: Two-Branch Application
- Appendix C: Link Budget Analysis
- Appendix D: SEL-RP50 Fault Repeater Detailed Implementation
- Technical Support
53
Date Code 20210405 Instruction Manual SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System
Appendix C: Link Budget Analysis
Effective Receive Sensitivity (Equation D.6)
Effective RX Sensitivity (dBm) = –97 (dBm) – (–6 (dB))
Effective RX Sensitivity (dBm) = –91 (dBm)
Link Margin (Equation D.7)
Link Margin (dB) = –84.3 (dBm) + 91 (dBm)
Link Margin (dB) = 6.7 (dB)
A link margin of 6.7 dB is likely to provide insufficient coverage for this applica-
tion. Consider increasing the SEL-FR12 antenna gain, and changing the location
of the SEL-FT50 to avoid obstructions.