![Toshiba GR 200 Series Instruction Manual Download Page 155](http://html.mh-extra.com/html/toshiba/gr-200-series/gr-200-series_instruction-manual_429785155.webp)
6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 134 -
reversal may be found when an external looped circuit exists if not for parallel lines.
Figure 2.3-11 Current reversal phenomeon
Figure 2.3-11 (b) shows sequentially the operation of the forward looking element, the
reverse looking element, and CRL on line L2 before and after the occurrence of the current
reversal.
At terminal A2, the forward looking element does not run, but the reverse looking
element runs when the current reversal is yielded. At terminal B2, the forward looking element
runs, but the reverse looking element does not run.
Provided that the forward looking element runs at terminal A2 before the forward looking
element does not run at terminal B2. This may cause false operation of POP, UOP and BOP on
line L2.
A2
B2
B
A
A1
B1
F
L1
L2
(a) Direction of fault current
t1
CRL
Forward looking element
A2
(b) Sequence diagram
t2
t3
TREBK setting
TREBK setting
B2
:Fault current flow before CBA1 being opened
:Fault current flow after CBA1 being opened
Reverse looking element
CRL
Reverse looking element
Forward looking element
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: ......