Toshiba GR200 Series Instruction Manual page 1060

A B C
Figure 5.2-14 1.5CB arrangement with [APPL-CTSELECT]=2CT
CT polarity settings
(vi)
The user can reverse the CT polarity using settings. For example, the user wishes to change
the polarity to negative in the first currents group (that is, Ia, Ib, and Ic on the VCT; we term
them '1CT'), set Negative for the setting [Pol-1CT]. Similarly, for the second current group
(that is, Ia2, Ib2, and Ic2), set Negative for the setting [Pol-2CT]. The user can also change the
polarity in 'Ie', 'Ie2', 'Iem', as shown in Table 5.2-1.
Figure 5.2-15 Positive settings for Paralleling connected CTs in VCT12B
Busbar
IED
Feeder#1
Feeder#2
Busbar
Busbar
Setting [Pol-1CT] = Positive
Setting [Pol-1CT-Ie] = Positive
Line1
Line2
Setting [Pol-CT-Iem] = Positive
Busbar
- 1037 -
DIF function
VCT
CT
I a
I b
Three-phase
I c
currents
I a
I b
I c
I a2
I b2
I c2
Setting [APPL-CTSELECT] = 2CT
VCT
CT
I a
1CT
I b
I c
I e
1CT-Ie
I em
CT-Iem
6F2S1914 (0.49)
GRL200 (Soft 033 & 037)