Remote Differential Trip - Toshiba GRL100-701B Instruction Manual

OC1-A
OC1-B
OC1-C
OCD-A
OCD-B
OCD-C
[DIF-FS]
+
≥1
" "
OC
≥1
" "
OCD
" "
BOTH
" "
OFF
EFD
[DIFG-FS]
+
" "
ON
" "
OFF
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.
GRL100
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
409
≥1
& DIF.FS-A_OP
410
≥1
&
DIF.FS-B_OP
411
≥1
& DIF.FS-C_OP
&
&
&
412
≥1
& DIFG.FS_OP
Figure 2.2.4.1 Fail-safe Logic
GRL100
 15 
6 F 2 S 0 8 5 0
408
DIF-A_FS
≥1
DIF.FS_OP
DIF-B_FS
DIF-C_FS
(see Fig. 2.2.2.1.)
DIFG_FS
(see Fig. 2.2.3.1.)
GRL100