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6 F 2 S 0 8 2 8
Current change detection element OCD
The OCD operates if the vectorial difference between currents IM and IN observed one cycle apart
is larger than the fixed setting. Therefore, the operating sensitivity of this element is not affected
by the quiescent load current and can detect a fault current with high sensitivity.
The operation decision is made according to the following equation:
⏐
IM - IN
⏐
>
Is
where,
IM = present current
IN = current one cycle before
Is = fixed setting (8% of rated current)
Is
IM
IN
Figure 2.2.3.2 Current Change Detection
2.2.4 Open Terminal (Out-of-Service) Detection
Erroneous current data may be transmitted from the remote terminal when the remote relay is
out-of-service for testing or other purposes. To prevent false operation in this case, the relay sets
the receiving current data to zero in the differential current calculation upon detecting that the
remote terminal is out-of-service.
Figure 2.2.4.1 shows the remote terminal out-of-service detection logic. The local terminal can
detect that the remote terminal is out-of-service if it receives no interlink signal I.LINK-R1 from
the remote terminal. The interlink signal is configured from the circuit breaker CB and
disconnector DS status signal shown in Figure 2.2.4.2. Each terminal detects the out-of-service
condition and transmits its signal I.LINK to the other. Thus, out-of-service is detected when either
the circuit breaker or disconnector are open in all three phases.
The local terminal detects that the remote terminal is out-of-service by receiving a signal
L.TEST-R1 which is transmitted when the scheme switch [L. TEST] is set to "ON" at the terminal
under test.
REM1_IN_SRV: Remote terminal in-service
REM1_OFF_SRV: Remote terminal out-of-service
REM1_OFF_SRV
1104 SUB.COM1-R1
[OTD]
"
ON
"
(+)
&
1
REM1_IN_SRV
432
433
≥
1
R.DATA_ZERO
1587
1092 COM5-R1
1
≥
1
LOCAL_TEST
≥
1
L.TEST-R1
1650
I.LINK-R1
1651
By PLC
By PLC
2056 SUB.COM1-S1
By PLC
Figure 2.2.4.1 Out-of-Service Detection Logic
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 ...
Страница 267: ......