Toshiba GR-200 Series Instruction Manual page 533

VCT ratio setting
5.4.3
VCT ratio shall be agreed with the VTs and CTs on the transmission line. The user shall set
ratio values for VTs and CTs.
Setting VT ratio
(i)
A ratio of the primary voltage to the secondary voltage should be set for the VT. Find the
channel number corresponding to the VT. For example, when V L1 is inputted at Channel 4 on
the VCT, the user shall set the ratio using setting [AI1_Ch4_Ratio]. In other words, the user
shall set a ratio '3636 (i.e., 400kV/110V=3636)' for the [AI1_Ch4_Ratio] if the primary is 400kV
and the secondary is 110V. Confirm the VC channel position on the VCT.
Setting CT ratio
(ii)
Similarly, the user shall set a ratio for respective CT. For example, the user should set a value
'4000' for the [AI1_Ch1_Ratio] when the primary is 4000A and the secondary is 1A (i.e.,
4000/1=4000).
Setting list
(iii)
Setting of AC analog input (FEP_MV: Function ID: 200271)
Setting item
VCT AI1_Ch1_Ratio
AI1_Ch2_Ratio
AI1_Ch3_Ratio
AI1_Ch4_Ratio
AI1_Ch5_Ratio
AI1_Ch6_Ratio
AI1_Ch7_Ratio
AI1_Ch8_Ratio
AI1_Ch9_Ratio
Unit
Range
s
1.000 to 20,000.000 – For AC analog input ch#1 at VC
1.000 to 20,000.000 – For AC analog input ch#2 at VC
1.000 to 20,000.000 – For AC analog input ch#3 at VC
1.000 to 20,000.000 – For AC analog input ch#4 at VC
1.000 to 20,000.000 – For AC analog input ch#5 at VC
1.000 to 20,000.000 – For AC analog input ch#6 at VC
1.000 to 20,000.000 – For AC analog input ch#7 at VC
1.000 to 20,000.000 – For AC analog input ch#8 at VC
1.000 to 20,000.000 – For AC analog input ch#9 at VC
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Default setting
Contents
6F2T0200 (0.15)
Notes
value
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
GRE200 (1,2)