Toshiba GR200 Series Instruction Manual page 1051

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