Toshiba GR200 Series - 5.2.6 Settings for residual voltage, CT polarity, and busbar arrangements; (i) Setting [APPL-Ves2] = Ve; (ii) Setting [APPL-Ves2] = Vs2

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 1034 -
5.2.6 Settings for residual voltage, CT polarity, and busbar arrangements
In the IED, the residual voltage represented ‘Ve’ is given by the computation with three-phase
voltages (V
a
, V
b
, and V
c
), but the VCT is ready to obtain it exclusively using APPL-VCT
settings when the residual voltage transformer is connected with the VCT. Additionally, the
VCT has the settings for changing the CT polarity so that the user can reverse the polarity
without wiring works. In the 1.5CB arrangement, the IED is required to obtain double three-
phase currents measured at separate current-transforms so that the VCT has a setting for
selecting the current transformers.
APPL-VCT
10:48 1/2
APPL-Ves2 +
Vs2
Polarity Change >
Figure 5.2-8 APPL-VCT setting screen
(i) Setting [APPL-Ves2] = Ve
Set Ve for the setting [APPL-VTes2], when the residual voltage transform is provided. Figure
5.2-9 illustrates the signals from the VTs on the feeder are injected for the ‘Ve’ terminal on the
VCT.
A
C
B
VCT
VTs on feeder
IED
VT
Va
V
L1
V
L2
V
L3
VCHK function
V
s2
/V
e
Vb
Vc
Residual voltage
Setting [APPL-Ves2]=Ve
V
s
Reference voltage
VT on busbar
Busbar
Feeder
Three-phase voltages
V3
Ve (V0)
CB#1
Figure 5.2-9 Connection with residual VT
(ii) Setting [APPL-Ves2] = Vs2
Figure 5.2-10 illustrates the residual voltage transform is not provided; set Vs2 for the setting
[APPL-VTes2]. Note that the IED computes the voltage in zero-sequence mathematically (3V0)
using the three-phase voltages.