177
6
F
2
S
0
8
5
0
≥
1
&
&
0.2s
VTF2_ALARM
VTF2
1
100ms
0 t
CB-AND
UVFS
UVFG
OCD1
OVG
EFL
1
1
10s
t 0
≥
1
[
VTF1EN
]
"ON", “OPT-ON”
+
[
VTF2EN
]
"ON", “OPT-ON”
+
≥
1
VTF1_ALARM
VTF1
100ms
0 t
10s
t 0
350:OVG
634:EFL
873:UVFGOR
874:UVFSOR
605:OCD1-A
606:OCD1-B
607:OCD1-C
VTF_BLOCK
1914
1
EXT_VTF
1916
≥
1
VTF_ONLY_ALM
1915
≥
1
&
1
890
NON VTF
VTF_ALARM
889
1
891:VTF-ALARM
888:VTF
Figure 3.3.5.1 VTFS Logic
Setting
The setting elements necessary for the VTFS and their setting ranges are as follows:
Element Range
Step Default Remarks
UVFS
50 - 100 V
1 V
88 V
Phase - to - phase undervoltage
UVFG
10 - 60 V
1 V
51 V
Phase - to - earth undervoltage
EFL
0.5 - 5.0 A
0.1 A
1.0 A
Residual overcurrent
( 0.10 - 1.00 A
0.01 A
0.20 A) (*)
[VTF1EN] Off/On/OPT-On
On
VTF1
supervision
[VTF2EN] Off/On/OPT-On
On
VTF2
supervision
[VTF-Z4]
Off / On
On
Z4 blocked by VTF
(*) 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 Setting
Remarks
OCD1
Fixed to 0.5 A
Current change detection
(Fixed to 0.1 A)
OVG
Fixed to 20 V
Residual overvoltage
(*) 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”.
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