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
21
Date Code 20210405 Instruction Manual SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System
Device Installation
grounding and lightning protection devices. The antenna is typically mounted
higher up on the pole in a safe location. The appropriate antenna type is site-
specific. Perform a path study before choosing the antenna.
The SEL-FR12 serial port connects to one of the serial ports of the SEL-651R
that are configured for SEL M
IRRORED BITS communications. This connection
allows the SEL-FR12 to share the received fault with the recloser control. The
programmable logic of the recloser control is configured to incorporate the
received data as part of the protection or control decisions.
Installation details differ slightly for SEL-FR12 Fault Receivers placed in substa-
tions.
Refer to the SEL Radio Accessories Guide, available at selinc.com, for a com-
plete list of radio accessories offered by SEL.
Mounting the SEL-FR12
Use the accessory kit hardware to mount the SEL-FR12 in the recloser control
cabinet. When ordered as an accessory to the SEL-651R, the unit comes pre-
installed as part of the cabinet.
Chassis Ground and Power Connection
Connect the rear-panel grounding terminal (labeled with the ground symbol) to a
rack frame ground or main station ground for proper safety and performance. Use
4 mm
2
(12 AWG) or heavier wire of less than 2 meters (6.6 feet) for this connec-
tion. Make the ground connection before making the power connections.
Connect the power harness to a fused 12 V auxiliary power supply terminal on
the SEL-651R, paying attention to polarity.
If possible, turn on the SEL-FR12 and verify that the ENABLED LED illuminates.
Turn it off before continuing.
Connect the Serial Port
Use a short cable, such as the SEL-C272, to connect the serial output of the
SEL-FR12 to the recloser control or relay serial port that has been configured for
M
IRRORED BITS operation.
Turn on the SEL-FR12 and verify that the ROK LED illuminates. If ROK does not
assert, check the SEL-FR12 M
IRRORED BITS Speed and Address switches and
compare them with the M
IRRORED BITS port settings of the host device. Turn it
off before continuing.
Antenna
SEL offers directional and omnidirectional antennas of various sizes. Contact
SEL support or submit a path study if you need assistance in choosing the correct
antenna for your application. If your SEL-FT50 Fault Transmitters are all in one
location, you may opt use a directional antenna for greater gain. If you are setting
up a point-to-multipoint link, use an omnidirectional antenna.
Table 2 lists antennas that SEL offers as orderable accessories for the SEL-FR12.