Instruction Manual

Table Of Contents
55
Date Code 20210405 Instruction Manual SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System
Appendix D: SEL-RP50 Fault Repeater Detailed Implementation
When the SEL-RP50 is in sleep mode (see below) a single
SEL-RP50 needs up to 30 minutes to synchronize to the link mes-
sages coming from the SEL-FT50. If more than one SEL-RP50 is
present (with the same Unit ID) the link message synchronization
period repeats for each SEL-RP50.
The SEL-FT50 and SEL-RP50 are non-directional devices. They
operate the same for load or fault current flowing in either direction.
In systems that might be supplied by more than one source (during
maintenance after automatic restoration) the SEL-RP50s might not
be in a radial direction to the SEL-FT50. In this case a fault might
trigger an SEL-FT50, but the fault current may not have passed
through the SEL-RP50s and the SEL-RP50s might be asleep or off,
and be unable to repeat the fault.
Multiple SEL-FR12s may be used, since the SEL-FR12 is only a
receiver they will not affect each other.
Only one SEL-RP50 can be used with any SEL-FT50 manufactured
before May 2021 (use he repeater ID = Legacy setting)
Refer to Figure 34 for a settings example for simple SEL-FT50, SEL-RP50, and
SEL-FR12 system. The diagram breaks the feeder one-line to show individual
phases, and to provide the important detail on phase and Unit ID matching
between each SEL-FT50 and SEL-RP50. In other diagrams the three SEL-FT50s
or SEL-RP50s are drawn in a stacked manner to allow the diagram to be less-
cluttered. The key information:
Each SEL-RP50 only repeats signals with a single Unit ID and
matching Network ID
Install each SEL-RP50 on the same electrical phase as the
SEL-FT50, and configure with the same Unit ID.
Configure the SEL-RP50 nearest the SEL-FT50 with Repeater ID
=1
Increase the Repeater ID each step towards the SEL-FR12 (2, 3, 4, up
to 5)
All devices must be set to the same Net ID as the SEL-FR12
Figure 35 shows a feeder one-line diagram on a plan view of an idealized geo-
graphic area. There are 4 SEL-FT50 Trios, but three of them do not have line-of-
sight back the SEL-FR12 antenna.
In this system there are also twelve SEL-RP50s
Trio 1 can directly reach the SEL-FR12
Figure 34 Selection of Unit ID, Net ID, and Repeater ID