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6.5.1.3 Thermal overload element THM-A and THM-T
The testing circuit is same as the circuit shown in Figure 6.5.1.6.
The output signal of testing element is assigned to the monitoring jack A.
The output signal numbers of the elements are as follows:
Element Signal
No.
THM-A 189
THM-T
188
To test easily the thermal overload element, the scheme switch [THMRST] in the "Switch" screen
on the "Test" menu is used.
•
Set the scheme switch [THMRST] to "ON".
•
Enter the signal number to observe the operation at the monitoring jack A as shown in
Section 6.5.1.
•
Apply a test current and measure the operating time. The magnitude of the test current
should be between 1.2
×
Is to 10
×
Is, where Is is the current setting.
CAUTION
After the setting of a test current, apply the test current after checking that the THM% has
become 0 on the "Metering" screen.
•
Calculate the theoretical operating time using the characteristic equations shown in Section
2.7. Check that the measured operating time is within 5%.
6.5.1.5 Broken
conductor detection element BCD
The testing circuit is shown in Figure 6.5.7.
Three-phase
Current
source
TB1
-2
-1
-3
-4
-6
-5
Ia
Ib
GRL150
-A9
-B9
E
TB2
DC
power
supply
+
−
A
Ic
A
A
DC
voltmeter
+
0V
Monitoring
jack
A
0V
Figure 6.5.7 Testing BCD element
The output signal of testing element is assigned to the monitoring jack A.
The output signal numbers of the elements are as follows:
Содержание GRL150-100 Series
Страница 149: ... 148 6 F 2 S 0 8 2 8 ...
Страница 150: ... 149 6 F 2 S 0 8 2 8 Appendix A Programmable Reset Characteristics and Implementation of Thermal Model to IEC60255 8 ...
Страница 154: ... 153 6 F 2 S 0 8 2 8 Appendix B Signal List ...
Страница 180: ... 179 6 F 2 S 0 8 2 8 Appendix C Binary Output Default Setting List ...
Страница 182: ... 181 6 F 2 S 0 8 2 8 Appendix D Details of Relay Menu ...
Страница 195: ... 194 6 F 2 S 0 8 2 8 ...
Страница 196: ... 195 6 F 2 S 0 8 2 8 Appendix E Case Outline ...
Страница 199: ... 198 6 F 2 S 0 8 2 8 ...
Страница 200: ... 199 6 F 2 S 0 8 2 8 Appendix F Typical External Connections ...
Страница 223: ... 222 6 F 2 S 0 8 2 8 ...
Страница 228: ... 227 6 F 2 S 0 8 2 8 Appendix I Return Repair Form ...
Страница 232: ... 231 6 F 2 S 0 8 2 8 Appendix J Technical Data ...
Страница 238: ... 237 6 F 2 S 0 8 2 8 Appendix K Symbols Used in Scheme Logic ...
Страница 241: ... 240 6 F 2 S 0 8 2 8 ...
Страница 242: ... 241 6 F 2 S 0 8 2 8 Appendix L Inverse Time Characteristics ...
Страница 248: ... 247 6 F 2 S 0 8 2 8 Appendix M IEC60870 5 103 Interoperability ...
Страница 260: ... 259 6 F 2 S 0 8 2 8 Appendix N Resistor Box Option ...
Страница 263: ... 262 6 F 2 S 0 8 2 8 ...
Страница 264: ... 263 6 F 2 S 0 8 2 8 Appendix O Ordering ...
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