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Scheme Logic
2.20.3
Figure 2.20-1 shows the logics of the VTF function. As described earlier, the VT failure is
grouped into the VTF1 criterion (VTF1_DETECT) and the VTF2 criterion (VTF2_DETECT).
When we consider the VTF1 criterion, the upper logic in Figure 2.20-1 is used; whereas we
consider the VTF2 criterion, lower one is used.
The user can select either the VTF1 or VTF2 criteria using the using the scheme switch
[VTF1EN] or [VTF2EN].
VTF1 DETECT
8000001C20
A
≥1
8100001C21
B
UVVTF
8200001C22
C
From PROT-CCOMMON
1
OCD-AT
≥1
OCD-BT
OCD-CT
On
VTF1-EN
OPT-On
VTF2 DETECT
8800001C27
OVGVTF
1
8400001C28
EFVTF
On
VTF2-EN
OPT-On
From PROT-COMMON
1
CB_ALLPH_CLOSE
From test
AMF_OFF
1
3
800000EBB0
VTF_BLOCK
EXTERNAL_VTF
810000EBB1
Note: Signal CB_ALLPH_CLOSE is provided from Protection common function
1
(PROT_COMMON). The OCD relay is used for both the VTF1 DETECT and the
VTF2 DETECT. For more information, see Chapter 2.24.
Note: Output signals are provided for respective relays when the relays are available.
2
See
Note: AMF feature is used for the test. To generate the AMF signal, see chapter
3
1
1
S
&
≥1
R
&
1
t
0
1
&
10.0s
≥1
1
≥1
S
&
≥1
R
&
1
&
≥1
1
0. 2s
1
≥1
8100001BB1
Figure 2.20-1 Scheme logic in the VTF function
Appendix: Ordering (→p.
&
t
0
S
t
0
≥1
0.015s
R
1
0.1s
&
t
0
S
t
0
≥1
0.015s
R
1
0.1s
)
1133
whether the relays are supplied into the IED.
- 223 -
6F2T0207 (0.01)
8100011C60
8000001B61
≥1
t
0
VTF1_ALARM
10.0s
8200021C60
8200021C60
≥1
t
0
VTF2_ALARM
10.0s
≥1
800000B62
VTF_ALARM
To Automatic supervision
To OC
2
To EF
2
To UV
2
To UVS
2
To OV
2
To OVS
2
8000001B61
≥1
To OCN
2
VTF_DETECT
User
GRE200 (5,6)
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