Toshiba GR200 Series - 5.2.2 VCT12 B

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 1028 -
5.2.2 VCT12B
VCT12B is designed for a single circuit breaker arrangement (1CB), as shown in Figure 5.2-4.
VCT12B is available for 1/2 size case and larger. When the VCT12B is used in 1.5CB
arrangement, the user should have the Paralleling connected CTs (i.e., summation) at VCT12B.
V
a
V
b
V
c
VCT12B
V
s
V
s2
(or V
e
)
I
a
I
b
I
c
I
e
I
em
V
a
V
b
V
c
Three-phase voltages
I
a
I
b
I
c
The three-phase currents in the 1CB
arrangement
Residual current
The other residual current in the
parallel lines
V
s
Reference voltage on busbar
Reference voltage on busbar or
residual voltage
V
s2
Figure 5.2-4 Transformer module (VCT12B)
(1)
Note: The cannel number about the AC analog input is used to represent the
terminal location when the user sets the ratio about the CT or the VT. We
shall discuss later in section Setting VCT ratio.
(2)
Note: In 5A rated operation, jumpers are inserted on all CTs, whereas no jumper is
inserted for 1A rated. To change it, see section Changing VCT rated current .
(3)
Note: For the destination of input signals, see Appendix: Matrix between VCT
terminals and relay applications .
(4)
Note: Reference voltage (either Vs or Vs2) is used in the Voltage check (VCHK)
function; see Chapter Relay applications: VCHK .
(5)
Note: Residual voltage (Ve) can be selected when setting [APPL-Ves2] = Ve. For
more information, see the succeeding section.
Terminal
Screw
Number
Input
signal
(3)
Type of
input
Jumper
position
(2)
AC analog
input
channel
(1)
1
2
V
a
Voltage
NA
Ch1
3
4
V
b
Voltage
NA
Ch2
5
6
V
c
Voltage
NA
Ch3
7
8
V
s
(4)
Voltage
NA
Ch4
9
10
V
s2
(4)
/V
e
(5)
Voltage
NA
Ch5
11
12
I
a
Current
W6
Ch6
13
14
I
b
Current
W7
Ch7
15
16
I
c
Current
W8
Ch8
17
18
I
e
Current
W13
Ch9
19
20
–
–
–
–
21
22
–
–
–
–
23
24
–
–
–
–
25
26
–
–
–
–
27
28
I
em
Current
W12
Ch14