15
6
F
2
S
0
8
5
0
DIF.FS-A_OP
OC1-A
OC1-B
OC1-C
OCD-A
OCD-B
OCD-C
[DIF-FS]
"
BOTH
"
"
OCD
"
"
OFF
"
"
OC
"
+
&
&
&
&
≥
1
≥
1
&
&
≥
1
≥
1
≥
1
409
DIF.FS-B_OP
410
DIF.FS-C_OP
411
DIF.FS_OP
408
EFD
&
≥
1
DIFG.FS_OP
412
[DIFG-FS]
"
ON
"
+
"
OFF
"
DIFG_FS
(see Fig. 2.2.3.1.)
DIF-A_FS
DIF-B_FS
DIF-C_FS
(see Fig. 2.2.2.1.)
≥
1
Figure 2.2.4.1 Fail-safe Logic
2.2.5 Remote Differential Trip
Note: This function is available only when the three-terminal protection is applied by
setting the scheme switch [TERM] to “3-TERM”. In the case of A-MODE setting,
this function is not available.
When one of the telecommunication channels fails, the terminal using the failed channel is
disabled from performing current differential protection, as a result of the failure being detected
through by the telecommunication channel monitoring.
Figure 2.2.5.1 Protection Disabled Terminal with Channel Failure
The remote differential trip (RDIF) function enables the disabled terminal to trip by receiving a
trip command from the sound terminal, which continues to perform current differential
protection.
Figure 2.2.5.2(a) and (b) show the RDIF scheme logic at RDIF command sending terminal (=
sound terminal) and command receiving terminal (= disabled terminal). The sound terminal
GRL100
GRL100
GRL100
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Summary of Contents for GRL100-701B
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