⎯
115
⎯
6 F 2 S 0 8 4 6
2.5.8 Negative Sequence Directional Elements DOCNF and DOCNR
There are two types of negative sequence directional element, the forward looking element
(DOCNF) and reverse looking element (DOCNR). They are used to detect faults during a power
swing. Their characteristics are shown in Figure 2.5.8.1.
Both the DOCNF and DOCNR use negative sequence current and voltage and determine a fault
direction based on the phase relationship between the current and voltage.
The operation decision is made using the following equation.
DOCNF
Z
k
I
2
2
−
V
2
I
2
sin
φ
≥
V
2k
|
I
2
|
I
2
≥
I
2k
DOCNR
Z
k
I
2
2
+ V
2
I
2
sin
φ
≥
V
2k
|
I
2
|
I
2
≥
I
2k
where,
I
2
= negative sequence current
V
2
= negative sequence voltage
φ
= lagging angle of I
2
to V
2
I
2k
= 0.267
×
rated current (fixed)
V
2k
= 6 V (fixed)
Z
k
= 2.5 ohm (1A rating, fixed) / 0.5 ohm (5A rating, fixed)
Figure 2.5.8.1 Negative Sequence Directional Element
I2
φ
DOCN-F
0
DOCN-R
V
2k
−
ZkI
2
−
(V
2k
−
ZkI
2
)
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: ......