Toshiba GR-200-5 Instruction Manual page 662

Electric quantity definitions
5.4.8
Electric quantities, such as current/voltage/power (Ia, Va, P, etc.), are presented and
determined with CT/VT connection styles, as discussed in preceding sections. This section
groups the electrical quantities by the settings, which can allow calculate properly.
Current components handed in IED
(i)
Handling currents in the IED are grouped and summarized (see Chap. 5.4.5). For example, if
the IED has settings [Conn-CT]=2P and [2P_Type]=1, Ia and Ic will be mentioned with
entering currents at I L1 and I L3 terminals (see Table 4.3.4-1). Symmetrical components (I 1 ,
I 2 , and I 0 ) are zero (0) when this example is described.
Table 5.4-11 Current defined with VCT entering signals and settings
Current
handled in
No
3P
IED
Use
I
Ia 0
L1
Phase
(*)
I
Ib 0
L2
current
I
Ic 0
L3
Ie
Zero- Ie determined with combination settings [Conn-CT] and [Conn-IeCT] (see Table 5.4-12)
phase
Ise
I +a∙I
(*) L1
I1 0
Symmet
2
I +a ∙I
(*) L1
I2 0
rical
currents
I +I
L1 L2
I0 0
3
†
Table 5.4-12 Ie
Setting combination
No Use
Setting
Residual
[Conn-IeCT]
Independent
: The currents (i.e., Ib, I1, I2 and Ie modeled by settings [Conn-CT]=2P and
(*)
Note
[2P_Type]=2P) are used only for the metering, and the operations of protection
relays do not judge themselves by using those currents.
Setting[Conn-CT]
2P
Setting
Setting [2P_Type]
[2P_Type]
=1
I
L1
0
I
L3
2
+a ∙I I +a∙I
L1
L2 L3
0
3
I +a
+a∙I
L1
L2 L3
0
3
I
+I
L3
L1
0
( )
*
ruled by settings [Conn-CT] and [Conn-IeCT]
No Use
I
0
L1
Auto change
Ie
"Ie" or "I
Ie
Setting[Conn-IeCT]
No
use
=2
I
L1
(*)
I
L2
I
L3
(*)
2
+a ∙I
L2 L3
3
(*)
2
∙I
+a∙I
L2 L3
3
+I
+I
L2 L3
3
Setting[Conn-CT]
Setting
3P
[2P_Type]=1
+ I + I
0
L2 L3
Ie
+ I + I "
L1 L2 L3
Ie Ie
- 642 -
6F2T0207 (0.01)
Setting[Conn-IseCT]
Indepen
Residual
No use
dent
0
2P
Setting [2P_Type]=2
I + I + I
L1 L2 L3
Auto change
"Ie" or "I + I + I
L1 L2
Ie
GRE200 (5,6)
Use
Ise
(*)
"
L3