94
6
F
2
S
0
8
3
4
≥
1
&
&
0.2s
VTF2_ALARM
VTF2
1
100ms
0 t
CB-AND
UVFS
UVFG
OCD
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
62
568
142:UVFGOR
140:UVFSOR
63:OCD-A
64 OCD-B
65:OCD-C
VTF_BLOCK
1642
1
EXT_VTF
1541
≥
1
VTF_ONLY_ALM
1643
≥
1
&
1
175
173:VTF
NON VTF
VTF_ALARM
172
174
1
Figure 2.4.14.1 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
OCD
Fixed to 0.5 A
Current change detection
(Fixed to 0.1 A)
OVG
Fixed to 20 V
Residual overvoltage
(*) Current values shown in the parentheses are 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.
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