Instruction Manual

7
Date Code 20210405 Instruction Manual SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System
Application Examples
➤ The ROK, TX, RX (green), and LOOP (red) LEDs indicate MIRRORED
B
ITS status and activity. The ROK LED illuminates when MIRRORED
B
ITS data exchange is successful.
➤ The TARGET RESET pushbutton resets the FAULT LEDs. Press and hold
the pushbutton to illuminate all HMI LEDs (lamp test function).
Application Examples
Collect Fault Information From Remote Branches
A traditional recloser control or substation circuit breaker must be coordinated
with the other protective devices on a distribution feeder, including fuses on
downstream line segments. On the sample feeder in Figure 6, the recloser control
or substation relay cannot distinguish one segment from another.
The SEL-FT50/SEL-FR12 system offers increased visibility to a recloser control
by providing fault status from locations up to 400 m (0.25 miles) with line-of-
sight. Figure 7 illustrates how this allows the recloser control to see faults on
individual branches, including locations where it is not economically feasible to
install a relay or recloser. Each SEL-FT50 label in Figure 7 represents three
SEL-FT50 Fault Transmitters, one per phase.
Table 1 Target and Status LED Definitions
a
a
The FAULT and LINK LED operation changes during RSSI measurement mode and Read Settings mode (see Receive Signal Strength Indicator on
page 26
and Read Settings on page 30 ).
LED (Color) Off Flashing On Reset Methods
FAULT (red) target No fault signal has been
received from the corre-
sponding Unit ID since the
last reset.
Not applicable. The SEL-FR12 received a
fault signal from the corre-
sponding Unit ID since the
last reset.
Manual—resets via the
TARGET RESET pushbutton.
Remote—resets via
MIRRORED BITS.
LINK (green) status The SEL-FR12 has not
detected an SEL-FT50
with the corresponding
Unit ID since initialization.
This learning feature keeps
unused LINK LEDs turned
off.
The SEL-FR12 is not pres-
ently receiving signals
from the previously learned
Unit ID, indicating that an
SEL-FT50 is not harvest-
ing energy during low-
current conditions or an
outage.
The SEL-FR12 has
received signals from the
corresponding Unit ID
within the last minute, indi-
cating that the SEL-FT50
is receiving minimum radio
link active current.
Automatic—learning mode
resets automatically after
the SEL-FR12 turns on.
Remote—resets via
M
IRRORED BITS.
Figure 6 Typical Recloser Visibility
R
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