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
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SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System Instruction Manual Date Code 20210405
Application Examples
Each SEL-FT50 monitors line current and instantly transmits a wireless signal
when an overcurrent (fault) condition occurs. The companion SEL-FR12 receives
and aggregates fault data from as many as 12 SEL-FT50 Fault Transmitters.
Upon detecting a fault indication signal, the SEL-FR12 communicates the fault
information to the host SEL-651R recloser control, or other SEL protective relay,
by using M
IRRORED BITS communications.
The SEL-FT50/SEL-FR12 system allows the protective relay or recloser control
to make intelligent decisions by using high-speed fault information from remote
locations.
Improve Fuse Coordination
In a radial distribution system, there are two main schemes that control fuse coor-
dination: fuse-saving and fuse-blowing (also called trip-saving). Each of these
schemes has shortcomings that you can address with the SEL-FT50/SEL-FR12
system.
Figure 7 Recloser Communication With Fault Transmitters
R
Wireless
SEL-FT50
SEL-FT50
SEL-FT50
SEL-FT50
SEL-FR12
SEL-651R-2