Toshiba GR200 Series Instruction Manual page 508

Line differential protection ied
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Setting example 2 (Bus-bar VT=three phases, Line VT=phase-BC)
(ii)
Bus-bar VT
(Three Phase)
Figure 2.35-7 Example 2: Input voltages and respective phasor diagram for SYN1
Note:
V Bus-bar is Running voltage.
1
Note:
V Line is Incoming voltage.
2
Similarly, Figure 2.35-7 shows the VCT input voltages and phases from Bus-bar and Line.
In this case, configure the settings in accordance with Figure 2.35-7 and Table 2.35-8.
Output voltage at VT
Input voltage at VCHK
VCHK Setting
3
Note: V3 is set for the scheme switch [SYN-VLine]. This is because the resultant phase
3
of V-L2, V-L3 and V3 is same.
Line
VCT
Line VT
(Phase B-C)
V a (V L1 )
V b (V L2 )
V c (V L3 )
Vs (V 3 )
Vs2 (V4)
V Line (Vs)
Table 2.35-8 Setting for example 2
Bus-bar VT=
Line VT=
Running voltage(V b and c )=
Incoming voltage (Vs)=
[SYN-VBus] =
[SYN-VLine]=
- 485 -
V c
a. Phasor diagram in Bus-bar
Vs
b. Phasor diagram in Line
1
2
V Bus-bar (V bc )
Three phase
Phase-BC
Phase-B and C (Bus-bar VT)
Phase-BC (Line VT)
V-L23
V3
6F2S1914 (0.49)
V a
V b
V bc
GRL200 (Soft 033 & 037)

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