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Transformer module for AC analog input (VCT)
The transformer module (VCT) is used to get the power system quantities. A safety feature is
available such that all of the VCT current inputs are shorted when a VCT module is removed
from the IED case. Note also that all of the voltage inputs are disconnected. However, the user
should make short circuit all AC current inputs and disconnect all AC voltage inputs.
Note: We represent respective input signals at the "AC analog input (VCT)" as "Channel
numbers (Ch*)" when settings as to the CT/VT ratios are required. The figure
below shows the operation screen for ratio and connection styles, which we shall
discuss later.
The blow figures exemplify the ratio settings for respective channels on the LCD screen.
AC Analog Input
10:48
1/2
AI#1
>
APPL-VCT
>
Figure 5.4-1 Setting samples about AC analog input (LCD screen)
Note: For more information about the LCD operation, see chapter
977).
AI#1
10:48
1/6
CH1
>
CH2
>
CH3
>
CH4
>
CH5
>
CH6
>
APPL-VCT
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Conn-CT
+
2P
Conn-IeCT
+
Residual
Conn-VT
+
Use
Conn-VeVT
+
Use
Conn-VsVT
+
Use
Polarity Change >
- 627 -
6F2T0207 (0.01)
CH1
10:48
1/1
AI1_Ch1_Ratio
+
2000
Conn-CT
10:48
1/1
2P_Type
+
1
Polarity Change
10:48
1/2
Pol-CT
+
Positive
Pol-IeCT
+
Positive
User interface
(→p.
GRE200 (5,6)
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