6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 225 -
One of the benefits of the “re-trip” function is that it can used to avoid accidental tripping
of an adjacent CB or an upstream CB. This is particularly requisite during maintenance and
testing of the system.
2.10.3
Backup feature
As cited above, “re-trip” issues a further trip signal so that the CB receives an instruction to
trip again. If “re-trip” cannot remove the fault, CBF will issue a “back-trip” command. Back-
tripping is used as a last resort to remove the fault.
Fault
Adjacent CB(s)
Retrip
Toc
Toc
Tcb
Toc
TCBF-RE
TCBF-TP
Normal trip
Open
Off
CBF Start
Back-trip adjacent CB(s)
Trip signal
Target CB
OCCBF element
Timer#1 (TCBF-RE)
Timer#2 (TCBF-TP)
Operation of Re-trip
CBF trip signal
On
Closed
Off
Closed
Stop
Run
Off
On
Timer#2
Start
Off
On
Fault occurence
Trip signal
Normal trip
Trip signal
Re-trip
Stop
Off
Off
Off
Off
Timer#1
Start
Figure 2.10-1 Timing chart for re-trip and back trip during CBF operation
Figure 2.10-1 is a sequence diagram for the CBF function; the overall sequence illustrated
shows a target CB failing to remove a fault with the consequence that back tripping of the
adjacent CB(s) is required following operation of the CBF protection to finally clear the fault.
The CBF function is initiated via a signal from other protection functions.
If the target CB is tripped normally on receipt of a trip signal so that the fault is removed,
both OCCBF and EFCBF will reset before the time settings of timer #1 and timer #2 have
elapsed.
Following the issue of the first trip signal, if either OCCBF or EFCBF were to continue
to operate and if timer #1 were to time out according to the timer setting value [
TCBF1-RE
], a
“re-trip” command would be issued to the target CB. If the target CB were to open to clear the
Содержание GR 200 Series
Страница 1047: ...6F2S1915 0 46 GRZ200 Soft 031 032 1026 Figure 8 3 4 Screen shot from GR TIEMS ...
Страница 1354: ...6F2S1915 0 46 GRZ200 Soft 031 032 1333 Appendix 1 Signal list for common function ...
Страница 1369: ...6F2S1915 0 46 GRZ200 Soft 031 032 1348 Unit mm Panel cut out for 1 2 case size Figure 2 2 3 Panel cutout figure 1 2 size case ...
Страница 1410: ...6F2S1915 0 46 GRZ200 Soft 031 032 1389 This page is intentionally blank ...
Страница 1480: ...6F2S1915 0 46 GRZ200 Soft 031 032 1459 Appendix 6 Ordering ...
Страница 1497: ...6F2S1915 0 46 GRZ200 Soft 031 032 1476 Appendix 7 Technical data ...
Страница 1518: ...6F2S1915 0 46 GRZ200 Soft 031 032 1497 Appendix 8 Manufacture setting ...
Страница 1520: ...6F2S1915 0 46 GRZ200 Soft 031 032 1499 Appendix 9 Matrix between VCT terminals and relay applications ...
Страница 1523: ...6F2S1915 0 46 GRZ200 Soft 031 032 1502 Appendix 10 CT requirement ...
Страница 1531: ...6F2S1915 0 46 GRZ200 Soft 031 032 1510 Appendix 12 Engineering exercise ...
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