Instruction Manual

18
SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System Instruction Manual Date Code 20210405
Network Deployment Overview
An area study may also be performed for system with proposed repeaters. In this
case, the characteristics of each segment must be considered. Use the SEL-RP50
receive sensitivity and EIRP values listed in Specifications.
If you do not have a clear line of sight between the SEL-FT50 and the
SEL-FR12, you may wish to set up a repeater at a high point between the trans-
mitter and the receiver, where the SEL-FR12 is at the repeater site along with an
SEL-3031, which can be used as a backhaul device. The SEL-3031 repeater solu-
tion adds additional latency to the link.
The area study is only a software-based estimate and should always be accompa-
nied by on-site analysis and testing.
Planning
SEL-FT50 Site Survey
Survey the SEL-FT50 installation site to check for local obstructions between the
SEL-FT50 and SEL-FR12. If an obstruction does exist, consider whether the
SEL-FT50 location could be moved to a nearby span to avoid the obstruction
without compromising the application of the device, as shown in Figure 14.
In systems where the line-of-sight cannot be maintained, SEL-RP50 Fault
Repeaters can be installed along the distribution feeder to help carry the wireless
signals around obstacles. For best results these must be installed on the same
feeder as the SEL-RP50s being repeated, one per phase, as shown in Figure 15.
See Appendix D: SEL-RP50 Fault Repeater Detailed Implementation on page 54
for further examples and implementation details.
Figure 14 Alternative SEL-FT50 Location
Figure 15 Use SEL-RP50s to Avoid an Obstruction -- need updated drawing
NOTE: SEL-RP50 Fault Repeaters
are not available in all countries. See
Tab le 13 .
Relocation
Primary
SEL-FT50
Location
Alternative
SEL-FT50
Location
>15 dB Link Margin
<15 dB Link Margin
SEL-FR12
Location
Obstruction