Differential Current (Id) Monitoring - Toshiba GRL100-701B Instruction Manual

CB-AND
873:UVFGOR
UVFS
≥1
874:UVFSOR
UVFG
605:OCD1-A
606:OCD1-B
607:OCD1-C
OCD1 1
[VTF1EN]
+
"ON", "OPT-ON"
350:OVG
OVG
634:EFL
1
EFL
[VTF2EN]
+
"ON", "OPT-ON"
1914 VTF_BLOCK
EXT_VTF
1916
VTF_ONLY_ALM
1915
Setting
The setting elements necessary for the VTFS and their setting ranges are as follows:
Element Range
UVFS 50 - 100 V
UVFG 10 - 60 V
EFL 0.5 - 5.0 A
( 0.10 - 1.00 A
[VTF1EN] Off/On/OPT-On
[VTF2EN] Off/On/OPT-On
[VTF-Z4] Off / On
(*) Current values shown in the parentheses are in the case of 1 A rating. Other current values are in
the case of 5 A rating.
The following elements have fixed setting values.
Element
OCD1
OVG
(*) Current value shown in the parentheses is in the case of 1 A rating. Other current value is in the
case of 5 A rating.
When setting the UVFS, UVFG and EFL, the maximum detection sensitivity of each element
should be set with a margin of 15 to 20% taking account of variations in the system voltage, the
asymmetry of the primary system and CT and VT error.
3.3.6

Differential Current (Id) Monitoring

The DIFSV element is provided to detect any erroneous differential current appearing as a result
of CT circuit failure. The tripping output signal of the DIF elements can be blocked when the
DIFSV element output is maintained for the setting time of TIDSV. To block the tripping output
with DIFSV operation, set scheme switch [IDSV] to "ALM&BLK". To alarm only, set to
"ALM".
&
0
100ms
1
0.2s
0
&
100ms
1
1
Figure 3.3.5.1 VTFS Logic
Step
1 V
1 V
0.1 A
0.01 A
Setting
Fixed to 0.5 A
(Fixed to 0.1 A)
Fixed to 20 V
 177 
t 0
10s
t
≥1
≥1
t 0
10s
t
≥1
888:VTF
≥1
Default Remarks
88 V Phase - to - phase undervoltage
51 V Phase - to - earth undervoltage
1.0 A Residual overcurrent
0.20 A) (*)
On VTF1 supervision
On VTF2 supervision
On Z4 blocked by VTF
Remarks
Current change detection
Residual overvoltage
6 F 2 S 0 8 5 0
889
VTF1_ALARM
VTF1
891:VTF-ALARM
VTF_ALARM
890
VTF2_ALARM
VTF2
NON VTF
& 1