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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
