Toshiba GR200 Series - 5.2.4 Setting VCT ratio; (i) Setting a ratio for the VT; (ii) Setting a ratio for the CT; (iii) Setting list

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 1030 -
5.2.4 Setting VCT ratio
As input sources are transformed with various VTs and CTs in the power system, the user shall
set each VT or CT ratio at each VCT terminal.
(i) Setting a ratio for the VT
When the VT quantity applied at the VCT terminal, a ratio of the primary voltage to the
secondary voltage should be set. A voltage is applied at the first terminal (Ch1) at VC1 alpha-
numeric reference, the user should set the ratio for the setting [AI1_Ch1_Ratio]. For example,
the user is requires to set a value ‘3636’ for the [AI1_Ch1_Ratio] when the primary is 400kV
and the secondary is 110V (i.e., 400kV/110V=3636). The channel position on the VCT is
discussed in the preceding section VCT .
(ii) Setting a ratio for the CT
When the CT quantity flows into the VCT terminal, a ratio of the primary current to the
secondary current should be set. For example, the user is required to set a value ‘4000’ for the
[AI1_Ch1_Ratio] when the primary is 4000A and the secondary is 1A (i.e., 4000/1=4000).
(iii) Setting list
Setting of AC analog input(Function ID: 200201)
Setting item
Range
Unit
s
Contents
Default setting
value
Notes
VC1
AI1_Ch1_Ratio
1.000 to 20,000.000
–
For AC analog input ch#1 at VCT#1
1.000
alpha-numeric
AI1_Ch2_Ratio
1.000 to 20,000.000
–
For AC analog input ch#2 at VCT#1
1.000
reference
AI1_Ch3_Ratio
1.000 to 20,000.000
–
For AC analog input ch#3 at VCT#1
1.000
AI1_Ch4_Ratio
1.000 to 20,000.000
–
For AC analog input ch#4 at VCT#1
1.000
AI1_Ch5_Ratio
1.000 to 20,000.000
–
For AC analog input ch#5 at VCT#1
1.000
AI1_Ch6_Ratio
1.000 to 20,000.000
–
For AC analog input ch#6 at VCT#1
1.000
AI1_Ch7_Ratio
1.000 to 20,000.000
–
For AC analog input ch#7 at VCT#1
1.000
AI1_Ch8_Ratio
1.000 to 20,000.000
–
For AC analog input ch#8 at VCT#1
1.000
AI1_Ch9_Ratio
1.000 to 20,000.000
–
For AC analog input ch#9 at VCT#1
1.000
AI1_Ch10_Ratio
1.000 to 20,000.000
–
For AC analog input ch#10 at VCT#1
1.000
AI1_Ch11_Ratio
1.000 to 20,000.000
–
For AC analog input ch#11 at VCT#1
1.000
AI1_Ch12_Ratio
1.000 to 20,000.000
–
For AC analog input ch#12 at VCT#1
1.000
AI1_Ch13_Ratio
1.000 to 20,000.000
–
For AC analog input ch#13 at VCT#1
1.000
AI1_Ch14_Ratio
1.000 to 20,000.000
–
For AC analog input ch#14 at VCT#1
1.000
†Note: For more information, see Chapter User interface: AC analog input.
‡Note: The number of AC analog input channels depends on the configuration of the VCT
type and the VCT slot. Thereby, the user has to set the value of the VCT ratio
corresponding to a specific auxiliary VT/CT.