⎯
73
⎯
6 F 2 S 0 8 4 6
Element Range
Step Default Remarks
SOTF - OC
OFF/ON
ON
Overcurrent tripping
SOTF - Z1
OFF/ON
OFF
Zone 1 tripping
SOTF - Z2
OFF/ON
OFF
Zone 2 tripping
SOTF - Z3
OFF/ON
OFF
Zone 3 tripping
SOTF - F
OFF/ON
OFF
Zone F tripping
SOTF - R1
OFF/ON
OFF
Zone R1 tripping
SOTF - R2
OFF/ON
OFF
Zone R2 tripping
SOTF - ND
OFF/ON
OFF
Zone ND tripping
SOTF-DL CB/UV/BOTH
CB
SOTF
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 OCH element and its setting are common with the stub protection.
2.4.8 Stub
Protection
In the case of a busbar with a one-and-a-half breaker arrangement, the VT is generally installed on
the line side. If the line is separated from the busbar, the distance protection does not cover to the
"stub" area between the two CTs and line isolator. This is because the line VT cannot supply a
correct voltage for a fault in the "stub" area. For a fault in the stub area under such conditions, fast
overcurrent protection is applied.
Scheme logic
The scheme logic for the stub protection is shown in Figure 2.4.8.1. The stub protection performs
three-phase tripping on the condition that the line disconnector is open (DS_N/O_CONT = 0) and
the overcurrent element has operated (OCH = 1). CB condition (STUB_CB) can be added by
using programmable BI function (PLC function). Tripping can be disabled by the scheme switch
[STUB].
OCH
[STUB]
STUB_TRIP
(M-TRIP)
"ON"
&
1
1
182
DS_N/O_CONT
1542
STUB_CB
1649
STUB_BLOCK
1622
55: OCH-A
56: OCH-B
57: OCH-C
Figure 2.4.8.1 Stub Protection Scheme Logic
Setting
The setting elements necessary for the stub protection and their setting ranges are as follows:
Element Range
Step Default Remarks
OCH
2.0 - 10.0 A
0.1 A
6.0 A
Overcurrent setting
(0.4 - 2.0 A
0.1 A
1.2 A) (*)
STUB OFF/ON
OFF Stub
protection
(*) 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 OCH element and its setting are common with the SOTF protection.
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: ......