6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 256 -
Table 2.14-2 Constant value at each setting of IDMT curve
Set item
k
a
C
IDMT
1
1
0
User-programmable
(Original)
0.00000 – 500.00000
by 0.00001 step
0.00000 – 10.00000
by 0.00001 step
0.00000 – 10.00000
by 0.00001 step
Reset feature
The user should set the time for resetting. Figure 2.14-3 shows that examples of the pick-up
and the drop-off relevant to both the fault occurrences and the operation time. The value of the
time counter furnished in the OVG1 element is incremented if faults occur.
As for an intermittent fault (the former in the figure), the time counter will not reach the
trip level. In the other words, the operation of the OVG1 element is paralyzed in the reset time
set by [
TOVG1R
].
If a series of fault occurs repeatedly (the latter in the figure), and if the value of the time
counter reaches at trip level, the OVG1 element will issue a trip command after a certain delay.
After issuing the trip command, if a series of fault completely disappears after issuing the trip
command, the value of the time counter will be expired after the reset time [
TOVG1R
].
When the user requires resetting the operation of the OVG1 element immediately, setting
zero for the settings [
TOVG1R
] is needed. Consequently, when a voltage falls below the reset
threshold (drop-off), the operation of the OVG1 element is reset promptly.
Figure 2.14-3 Faults occurrences and reset operation when IDMT being applied
Condition fault occurrence
Fault observation by the relay
Issue of trip command
Trip level
Incrimination of time counter
corresponding to the fault
duration.
T
1
T
1
: Resetting time set by the user
T
2
: Actual resetting time in the relay operation
T
3
: Time gap between fault occurrence and relay start time
Tripping
T
1
T
1
T
1
T
2
T
2
T
3
Intermittent fault
Series faults
Relay operation reset
Reset of time counter
Increment process in time
counter
Value maintenance of time counter
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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