13
6
F
2
S
0
7
8
9
phases of 2F element.
Protection by DIF and HOC can perform instantaneous three-phase tripping of up to five
breakers. Any of the five breaker tripping signals DIFT-1 to DIFT-5 are enabled or disabled by
the scheme switch [DIF1] to [DIF5] settings.
Table 2.3.1 Blocking Scheme during Magnetising inrush
Setting
2PAND
3POR
Scheme
Even if 2F or 5F element operates during
manetising inrush, the trip by DIF element is
allowed when any two phases or more of DIF
element operate.
When any one phase of 2F or 5F element
operates during manetising inrush, the trip by
DIF element is blocked.
Sensitivity of 2F and 5F element
I
2f
/I
1f
10 to 50% or I
5f
/I
1f
10 to 50%
Scheme logic
Refer to Figure 2.3.2
Response against magnetizing
inrush
No problem:
When second or fifth hartmonic component
of any two phases is lower than their
sensitivity setting, the DIF may operate.
No problem:
When second or fifth hartmonic component of
any one phase is higher than their sensitivity
setting, the DIF is surely blocked.
Detection at internal fault
No problem
No problem
Application
The “2PAND” is recommended for a
transformer with small or midium capacity
whose second harmonic component in
inrush current is genarally higher than that of
transformer with large capacity.
The “3POR” is recommended for a transformer
with large capacity whose second harmonic
component in inrush current is generally lower.
This block function is stronger than that of the
“2PAND”.
HOC-A
HOC-B
HOC-C
2f-Lock
+
1
DIF-A
DIF-B
DIF-C
2f-A
2f-B
2f-C
5f-A
5f-B
5f-C
&
&
&
&
5f-Lock
+
DIFT
&
&
&
&
&
1
1
1
1
1
1
1
1
1
1
&
1
1
TRIP
DIFT-1
DIF1
+
&
DIFT-2
DIF2
+
&
DIFT-3
DIF3
+
&
&
&
&
&
&
&
&
&
&
&
&
&
DIFTPMD
+
2PAND
3POR
1
&
1
1
DIFT-4
DIF4
+
&
DIFT-5
DIF5
+
&
“ON”
“ON”
“ON”
“ON”
“ON”
“ON”
“ON”
Figure 2.3.2 Scheme Logic of Current Differential Protection
Summary of Contents for GRT100 Series
Page 142: ... 141 6 F 2 S 0 7 8 9 Appendix A Block Diagram ...
Page 144: ... 143 6 F 2 S 0 7 8 9 Appendix B Signal List ...
Page 159: ... 158 6 F 2 S 0 7 8 9 ...
Page 160: ... 159 6 F 2 S 0 7 8 9 Appendix C Variable Timer List ...
Page 162: ... 161 6 F 2 S 0 7 8 9 Appendix D Binary Output Default Setting List ...
Page 165: ... 164 6 F 2 S 0 7 8 9 ...
Page 166: ... 165 6 F 2 S 0 7 8 9 Appendix E Details of Relay Menu and LCD and Button Operation ...
Page 174: ... 173 6 F 2 S 0 7 8 9 Appendix F Case Outline Flush Mount Type Rack Mount Type ...
Page 179: ... 178 6 F 2 S 0 7 8 9 ...
Page 180: ... 179 6 F 2 S 0 7 8 9 Appendix G External Connections ...
Page 185: ... 184 6 F 2 S 0 7 8 9 ...
Page 200: ... 199 6 F 2 S 0 7 8 9 ...
Page 201: ... 200 6 F 2 S 0 7 8 9 Appendix J Return Repair Form ...
Page 205: ... 204 6 F 2 S 0 7 8 9 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Page 206: ... 205 6 F 2 S 0 7 8 9 ...
Page 207: ... 206 6 F 2 S 0 7 8 9 Appendix K Technical Data ...
Page 220: ... 219 6 F 2 S 0 7 8 9 ...
Page 221: ... 220 6 F 2 S 0 7 8 9 Appendix M Symbols Used in Scheme Logic ...
Page 224: ... 223 6 F 2 S 0 7 8 9 ...
Page 225: ... 224 6 F 2 S 0 7 8 9 Appendix N Implementation of Thermal Model to IEC60255 8 ...
Page 228: ... 227 6 F 2 S 0 7 8 9 ...
Page 229: ... 228 6 F 2 S 0 7 8 9 Appendix O IEC60870 5 103 Interoperability and Troubleshooting ...
Page 241: ... 240 6 F 2 S 0 7 8 9 Appendix P Modbus Interoperability ...
Page 255: ... 254 6 F 2 S 0 7 8 9 ...
Page 256: ... 255 6 F 2 S 0 7 8 9 Appendix Q Inverse Time Characteristics ...
Page 259: ... 258 6 F 2 S 0 7 8 9 ...
Page 260: ... 259 6 F 2 S 0 7 8 9 Appendix R Failed Module Tracing and Replacement ...
Page 266: ... 265 6 F 2 S 0 7 8 9 Appendix S Ordering ...
Page 269: ... 268 6 F 2 S 0 7 8 9 3 1 Oct 2 2017 Republished under spin off company ...
Page 270: ......