40
6
F
2
S
0
7
8
9
L.)
I
d
= |1kct1
I
1o
+ 1kct2
I
2o
+ 1kct3
I
3o
+ I
N
|
I
r
= max.( |1kct1
I
1a
|, |1kct1
I
1b
|, |I1kct1
I
1c
|, |1kct2
I
2a
|, |1kct2
I
2b
|, |1kct2
I
2c
|, |1kct3
I
3a
|,
|1kct3
I
3b
|, |kct3
I
3c
|, |I
N
|)
where,
I
1o
, I
2o
, I
3o
: residual current of primary, secondary and tertiary winding
I
1a
, I
1b
, I
1c
, I
2a
, I
2b
, I
2c
, I
3a
, I
3b
, I
3c
: phase current of primary, secondary and tertiary winding
I
N
: residual current of neutral circuit
1kct1, 1kct2, 1kct3: CT ratio matching of primary, secondary and tertiary line CT to neutral
CT
Characteristic DF2 is expressed by the following equation:
I
d
p2
(I
r
kp)
where
p2: slope of DF2
kp: break point of DF1 characteristic
2.11.4 Inverse Time Overcurrent Element OCI and EFI
The OCI and EFI elements have one long time inverse characteristic and three inverse time
characteristics in conformity with IEC 60255-3 as shown in Figure 2.11.3. One of these
characteristics can be selected.
These characteristics are expressed by the following equations.
Long Time Inverse
t = T
120
(I/Is)
1
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
Содержание GRT100 Series
Страница 55: ... 54 6 F 2 S 0 7 8 9 TRANSFORMER PROTECTION GRT100 Operation keys 101B 21 11 Figure 3 1 9 Front Panel ...
Страница 142: ... 141 6 F 2 S 0 7 8 9 Appendix A Block Diagram ...
Страница 144: ... 143 6 F 2 S 0 7 8 9 Appendix B Signal List ...
Страница 159: ... 158 6 F 2 S 0 7 8 9 ...
Страница 160: ... 159 6 F 2 S 0 7 8 9 Appendix C Variable Timer List ...
Страница 162: ... 161 6 F 2 S 0 7 8 9 Appendix D Binary Output Default Setting List ...
Страница 165: ... 164 6 F 2 S 0 7 8 9 ...
Страница 166: ... 165 6 F 2 S 0 7 8 9 Appendix E Details of Relay Menu and LCD and Button Operation ...
Страница 174: ... 173 6 F 2 S 0 7 8 9 Appendix F Case Outline Flush Mount Type Rack Mount Type ...
Страница 179: ... 178 6 F 2 S 0 7 8 9 ...
Страница 180: ... 179 6 F 2 S 0 7 8 9 Appendix G External Connections ...
Страница 185: ... 184 6 F 2 S 0 7 8 9 ...
Страница 200: ... 199 6 F 2 S 0 7 8 9 ...
Страница 201: ... 200 6 F 2 S 0 7 8 9 Appendix J Return Repair Form ...
Страница 205: ... 204 6 F 2 S 0 7 8 9 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Страница 206: ... 205 6 F 2 S 0 7 8 9 ...
Страница 207: ... 206 6 F 2 S 0 7 8 9 Appendix K Technical Data ...
Страница 220: ... 219 6 F 2 S 0 7 8 9 ...
Страница 221: ... 220 6 F 2 S 0 7 8 9 Appendix M Symbols Used in Scheme Logic ...
Страница 224: ... 223 6 F 2 S 0 7 8 9 ...
Страница 225: ... 224 6 F 2 S 0 7 8 9 Appendix N Implementation of Thermal Model to IEC60255 8 ...
Страница 228: ... 227 6 F 2 S 0 7 8 9 ...
Страница 229: ... 228 6 F 2 S 0 7 8 9 Appendix O IEC60870 5 103 Interoperability and Troubleshooting ...
Страница 241: ... 240 6 F 2 S 0 7 8 9 Appendix P Modbus Interoperability ...
Страница 255: ... 254 6 F 2 S 0 7 8 9 ...
Страница 256: ... 255 6 F 2 S 0 7 8 9 Appendix Q Inverse Time Characteristics ...
Страница 259: ... 258 6 F 2 S 0 7 8 9 ...
Страница 260: ... 259 6 F 2 S 0 7 8 9 Appendix R Failed Module Tracing and Replacement ...
Страница 266: ... 265 6 F 2 S 0 7 8 9 Appendix S Ordering ...
Страница 269: ... 268 6 F 2 S 0 7 8 9 3 1 Oct 2 2017 Republished under spin off company ...
Страница 270: ......