
⎯
239
⎯
6 F 2 S 0 8 4 6
6.5.1.6 Inverse Definite Minimum Time Overcurrent Element (IDMT) OCI, EFI
The testing circuit is shown in Figure 6.5.1.4.
Single-phase
current
source
A
TB1
-2
-1
-7
-8
Ia
3Io
GRZ100
Monitoring
jack
A
0V
Time
counter
TB4 -A16
-A17
E
DC
power
supply
+
−
Start
Stop
OV
Figure 6.5.1.4 Testing IDMT
One of the four inverse time characteristics can be set, and the output signal numbers of the IDMT
are as follows:
Element Signal
number
OCI-A 97
OCI-B 98
OCI-C 99
EFI 61
Fix the time characteristic to test by setting the scheme switch MEFI or MOCI on the "Scheme
switche" screen.
"Setting (change)" sub-menu
→
"Protection" screen
→
"Trip" screen
→
"Scheme switch" screen
The test procedure is as follows:
•
Press 5 (= Logic circuit) on the "Test" screen to display the "Logic circuit" screen.
•
Enter a signal number to observe the OCI or EFI output at monitoring jack A and press the
ENTER key.
•
Apply a test current and measure the operating time. The magnitude of the test current should
be between 1.2
×
Is to 20
×
Is, where Is is the current setting.
•
Calculate the theoretical operating time using the characteristic equations shown in Section
2.5.4. Check that the measured operating time is within IEC 60255-3 class 5 for standard, very
and long-time inverse or IEC 60255-3 class 7.5 for extremely inverse.
6.5.1.7 Thermal overload element THM-A and THM-T
The testing circuit is same as the circuit shown in Figure 6.5.1.4.
The output signal of testing element is assigned to the monitoring jack A.
Summary of Contents for GRZ100 B Series
Page 264: ... 263 6 F 2 S 0 8 4 6 Appendix A Block Diagram ...
Page 271: ... 270 6 F 2 S 0 8 4 6 ...
Page 272: ... 271 6 F 2 S 0 8 4 6 Appendix B Signal List ...
Page 307: ... 306 6 F 2 S 0 8 4 6 ...
Page 308: ... 307 6 F 2 S 0 8 4 6 Appendix C Variable Timer List ...
Page 310: ... 309 6 F 2 S 0 8 4 6 Appendix D Binary Input Output Default Setting List ...
Page 321: ... 320 6 F 2 S 0 8 4 6 ...
Page 322: ... 321 6 F 2 S 0 8 4 6 Appendix E Details of Relay Menu and LCD Button Operation ...
Page 331: ... 330 6 F 2 S 0 8 4 6 ...
Page 340: ... 339 6 F 2 S 0 8 4 6 Appendix G Typical External Connections ...
Page 377: ... 376 6 F 2 S 0 8 4 6 ...
Page 384: ... 383 6 F 2 S 0 8 4 6 Appendix J Return Repair Form ...
Page 388: ... 387 6 F 2 S 0 8 4 6 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Page 389: ... 388 6 F 2 S 0 8 4 6 ...
Page 390: ... 389 6 F 2 S 0 8 4 6 Appendix K Technical Data ...
Page 401: ... 400 6 F 2 S 0 8 4 6 ...
Page 402: ... 401 6 F 2 S 0 8 4 6 Appendix L Symbols Used in Scheme Logic ...
Page 405: ... 404 6 F 2 S 0 8 4 6 ...
Page 406: ... 405 6 F 2 S 0 8 4 6 Appendix M Example of Setting Calculation ...
Page 417: ... 416 6 F 2 S 0 8 4 6 ...
Page 418: ... 417 6 F 2 S 0 8 4 6 Appendix N IEC60870 5 103 Interoperability and Troubleshooting ...
Page 434: ... 433 6 F 2 S 0 8 4 6 Appendix P Inverse Time Characteristics ...
Page 437: ... 436 6 F 2 S 0 8 4 6 ...
Page 438: ... 437 6 F 2 S 0 8 4 6 Appendix Q Failed Module Tracing and Replacement ...
Page 444: ... 443 6 F 2 S 0 8 4 6 Appendix R Ordering ...
Page 447: ......