6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 133 -
Undervoltage elements (UVLS or UVLG) being operated.
Neither forward overreaching element nor reverse looking element being operated.
&
&
&
≥
1
≥
1
≥
1
≥
1
UVLG-A
UVLG-B
UVLG-C
1
0 t
0.000 to 0.100 s
From PROT COMMON
UVLS-AB
UVLS-BC
UVLS-CA
0 t
0 t
t 0
TWICOORD
&
1
≥
1
DEAD_LINE_DEDTECT
WKIT-A_CONDITION
WKIT-B_CONDITION
WKIT-C_CONDITION
Figure 2.3-9 UV for WIKT
≥
1
8000001B6F
8100001B70
8200001B71
8300001B72
On
DISCAR_WITIP
DISCAR_WITIP-C
DISCAR_WITIP-B
DISCAR_WITIP-A
&
&
&
DISCAR_PARM1-A
≥
1
≥
1
≥
1
≥
1
From Z1G
≥
1
≥
1
≥
1
&
&
&
&
&
&
&
&
DISCAR_PARM1-B
DISCAR_PARM1-C
DISCAR_PARM1
From CARRIER-COMMON
CH1-USE
1
DISCAR_PARM1-A
≥
1
≥
1
≥
1
≥
1
&
&
&
&
DISCAR_PARM1-B
DISCAR_PARM1-C
DISCAR_PARM1
From CARRIER-COMMON
CH2-USE
1
&
DIS-WKIT
1
810000EBBE DIS-WKIT BLOCK
WKIT-A_CONDITION
WKIT-B_CONDITION
WKIT-C_CONDITION
From CARRIER-COMMON
ECHO1_CONDITION
≥
1
Dis-CAR
POP
UOP
Figure 2.3-10 WIKT logic
UV responds to three phase-to-phase voltages and three phase-to-ground voltages. UV
prevents false weak infeed tripping due to spurious operation of the channel.
WIKT can be enabled using scheme switch [
Dis-WKIT
]
On
.
2.3.6
Countermeasure for current reversal
When a fault occurs on one of the parallel lines, the reversal of fault current may be found on
another line owing to sequential CB opening. In the worst case, the current reversal can result
in false operation in POP, UOP and BOP. Thus, POP, UOP and BOP have current reversal logic
(CRL) to prevent the false operation.
Figure 2.3-11(a) shows the arrangement of parallel lines, as an example. Suppose that a
fault occurs at location F on line L1 at time t1. CBA1 is tripped at time t2; and later, CBB1 is
tripped at time t3. The current direction on line L2 can be reversed at time t2. That is, the
current (
) from terminal B to terminal A is found from time t1 to t2. However, the
current (
) from terminal A to terminal B is found from time t2 to t3. The current
Summary of Contents for GR 200 Series
Page 1047: ...6F2S1915 0 46 GRZ200 Soft 031 032 1026 Figure 8 3 4 Screen shot from GR TIEMS ...
Page 1354: ...6F2S1915 0 46 GRZ200 Soft 031 032 1333 Appendix 1 Signal list for common function ...
Page 1410: ...6F2S1915 0 46 GRZ200 Soft 031 032 1389 This page is intentionally blank ...
Page 1480: ...6F2S1915 0 46 GRZ200 Soft 031 032 1459 Appendix 6 Ordering ...
Page 1497: ...6F2S1915 0 46 GRZ200 Soft 031 032 1476 Appendix 7 Technical data ...
Page 1518: ...6F2S1915 0 46 GRZ200 Soft 031 032 1497 Appendix 8 Manufacture setting ...
Page 1523: ...6F2S1915 0 46 GRZ200 Soft 031 032 1502 Appendix 10 CT requirement ...
Page 1531: ...6F2S1915 0 46 GRZ200 Soft 031 032 1510 Appendix 12 Engineering exercise ...
Page 1563: ......