⎯
84
⎯
6
F
2
S
0
8
3
5
Standard Inverse
t = T
×
0.14
(I/Is)
0.02
−
1
Very Inverse
t = T
×
13.5
(I/Is)
−
1
Extremely Inverse
t = T
×
80
(I/Is)
2
−
1
where,
t = operating time
I = fault current
Is = current setting
T = time multiplier setting
2.11.4 Thermal Overload Element
Thermal overload element operates according to the characteristics defined in IEC60255-8.
(Refer to Figure 2.6.1 and Appendix P.)
2.11.5 Out-of-Step Element OST
The OST element detects the out-of-step by checking that the voltage phasor VB of the remote
terminal transits from the second quadrant (
α
-zone) to the third quadrant (
β
-zone) or vice versa
when the voltage phasor VA of the local terminal is taken as a reference.
Figure 2.11.5.1 Out-of-Step Element
VB is further required to stay at each quadrant for a set time (1.5 cycles) to avoid the influence of
any VT transient.
Positive phase voltages are used and valid for VA and VB when their amplitudes are larger than
1V.
α
-zone
VB
β
-zone
1V
VA
Summary of Contents for GRL100-101A
Page 223: ... 222 6 F 2 S 0 8 3 5 ...
Page 228: ... 227 6 F 2 S 0 8 3 5 Appendix B Signal List ...
Page 256: ... 255 6 F 2 S 0 8 3 5 Appendix C Variable Timer List ...
Page 258: ... 257 6 F 2 S 0 8 3 5 Appendix D Binary Output Default Setting List ...
Page 269: ... 268 6 F 2 S 0 8 3 5 ...
Page 270: ... 269 6 F 2 S 0 8 3 5 Appendix E Details of Relay Menu ...
Page 279: ... 278 6 F 2 S 0 8 3 5 ...
Page 288: ... 287 6 F 2 S 0 8 3 5 Appendix G Typical External Connection ...
Page 326: ... 325 6 F 2 S 0 8 3 5 Appendix J Return Repair Form ...
Page 330: ... 329 6 F 2 S 0 8 3 5 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Page 331: ... 330 6 F 2 S 0 8 3 5 ...
Page 332: ... 331 6 F 2 S 0 8 3 5 Appendix K Technical Data ...
Page 343: ... 342 6 F 2 S 0 8 3 5 ...
Page 344: ... 343 6 F 2 S 0 8 3 5 Appendix L Symbols Used in Scheme Logic ...
Page 347: ... 346 6 F 2 S 0 8 3 5 ...
Page 348: ... 347 6 F 2 S 0 8 3 5 Appendix M Multi phase Autoreclose ...
Page 351: ... 350 6 F 2 S 0 8 3 5 ...
Page 352: ... 351 6 F 2 S 0 8 3 5 Appendix N Data Transmission Format ...
Page 358: ... 357 6 F 2 S 0 8 3 5 Appendix O Example of DIF and DIFG Setting ...
Page 364: ... 363 6 F 2 S 0 8 3 5 Appendix Q IEC60870 5 103 Interoperability ...
Page 377: ... 376 6 F 2 S 0 8 3 5 ...
Page 378: ... 377 6 F 2 S 0 8 3 5 Appendix R Failed Module Tracing and Replacement ...
Page 384: ... 383 6 F 2 S 0 8 3 5 Appendix S PLC Setting Sample ...
Page 386: ... 385 6 F 2 S 0 8 3 5 Appendix T Ordering ...
Page 392: ......