⎯
67
⎯
6 F 2 S 0 8 4 6
•
standard inverse IEC 60255-3
•
very inverse
IEC 60255-3
•
extremely inverse IEC 60255-3
The IDMT element has a reset feature with definite time reset.
If the reset time is set to instantaneous, then no intentional delay is added. As soon as the
energising current falls below the reset threshold, the element returns to its reset condition.
If the reset time is set to some value in seconds, then an intentional delay is added to the reset
period. If the energising current exceeds the setting for a transient period without causing tripping,
then resetting is delayed for a user-definable period. When the energising current falls below the
reset threshold, the integral state (the point towards operation that it has travelled) of the timing
function (IDMT) is held for that period.
This does not apply following a trip operation, in which case resetting is always instantaneous.
Setting
The following table shows the setting elements necessary for the inverse time overcurrent backup
protection and their setting ranges.
Element Range
Step Default Remarks
OCI
0.5 - 25.0 A
0.1 A
10.0 A
( 0.10 - 5.00 A
0.01 A
2.00 A) (*)
TOCI
0.05 - 1.00
0.01
0.50
OCI time setting
TOCIR
0.0 – 10.0 s
0.1 s
0.0 s
OCI definite time reset delay
[MOCI]
Long/Std/Very/Ext
Std
OCI inverse characteristic selection
[OCIBT]
ON/OFF
ON
OCI backup protection
EFI
0.5 - 5.0 A
0.1 A
5.0 A
Earth fault EFI setting
( 0.10 - 1.00 A
0.01 A
1.00 A) (*)
TEFI
0.05 - 1.00
0.01
0.50
EFI time setting
TEFIR
0.0 – 10.0 s
0.1 s
0.0 s
EFI definite time reset delay
[MEFI]
Long/Std/Very/Ext
Std
EFI inverse characteristic selection
[DEFI]
OFF/NOD/F/R
OFF
EFI directional control
(*) Current values shown in the parentheses are in the case of 1 A rating. Other current values are in
the case of 5 A rating.
The scheme switches [MOCI] and [MEFI] are used to select one of the four inverse time
characteristics. The DEFI is the scheme switch for directional control selection and if NOD is
selected, the inverse time overcurrent protection executes non-directional operation. If F or R is
selected, it executes forward operation or reverse operation in combination with the DEFF or
DEFR. If OFF is selected, the inverse time overcurrent protection is blocked.
Current setting
In Figure 2.4.5.2, the current setting at terminal A is set lower than the minimum fault current in
the event of a fault at remote end F1. Furthermore, when considering also backup protection of a
fault on an adjacent line, it is set lower than the minimum fault current in the event of a fault at
remote end F3. For grading of the current settings, the terminal furthest from the power source is
set to the lowest value and the terminals closer to the power source are set to a higher value.
The minimum setting is restricted so as not to operate on false zero-sequence currents caused by an
unbalance in the load current, errors in the current transformer circuits or zero-sequence mutual
coupling of parallel lines.
Содержание GRZ100 B Series
Страница 264: ... 263 6 F 2 S 0 8 4 6 Appendix A Block Diagram ...
Страница 271: ... 270 6 F 2 S 0 8 4 6 ...
Страница 272: ... 271 6 F 2 S 0 8 4 6 Appendix B Signal List ...
Страница 307: ... 306 6 F 2 S 0 8 4 6 ...
Страница 308: ... 307 6 F 2 S 0 8 4 6 Appendix C Variable Timer List ...
Страница 310: ... 309 6 F 2 S 0 8 4 6 Appendix D Binary Input Output Default Setting List ...
Страница 321: ... 320 6 F 2 S 0 8 4 6 ...
Страница 322: ... 321 6 F 2 S 0 8 4 6 Appendix E Details of Relay Menu and LCD Button Operation ...
Страница 331: ... 330 6 F 2 S 0 8 4 6 ...
Страница 340: ... 339 6 F 2 S 0 8 4 6 Appendix G Typical External Connections ...
Страница 377: ... 376 6 F 2 S 0 8 4 6 ...
Страница 384: ... 383 6 F 2 S 0 8 4 6 Appendix J Return Repair Form ...
Страница 388: ... 387 6 F 2 S 0 8 4 6 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Страница 389: ... 388 6 F 2 S 0 8 4 6 ...
Страница 390: ... 389 6 F 2 S 0 8 4 6 Appendix K Technical Data ...
Страница 401: ... 400 6 F 2 S 0 8 4 6 ...
Страница 402: ... 401 6 F 2 S 0 8 4 6 Appendix L Symbols Used in Scheme Logic ...
Страница 405: ... 404 6 F 2 S 0 8 4 6 ...
Страница 406: ... 405 6 F 2 S 0 8 4 6 Appendix M Example of Setting Calculation ...
Страница 417: ... 416 6 F 2 S 0 8 4 6 ...
Страница 418: ... 417 6 F 2 S 0 8 4 6 Appendix N IEC60870 5 103 Interoperability and Troubleshooting ...
Страница 430: ... 429 6 F 2 S 0 8 4 6 Appendix O Programmable Reset Characteristics and Implementation of Thermal Model to IEC60255 8 ...
Страница 434: ... 433 6 F 2 S 0 8 4 6 Appendix P Inverse Time Characteristics ...
Страница 437: ... 436 6 F 2 S 0 8 4 6 ...
Страница 438: ... 437 6 F 2 S 0 8 4 6 Appendix Q Failed Module Tracing and Replacement ...
Страница 444: ... 443 6 F 2 S 0 8 4 6 Appendix R Ordering ...
Страница 447: ......