6 F 2 T 0 1 7 2
via Ethernet LAN.
Figure 4.6.1 shows an example of a substation automation system using Ethernet-based IEC 61850
communication.
Figure 4.6.1 IEC 61850 Communication Network
4.7 Clock Function
The clock function (Calendar clock) is used for time-tagging for the following purposes:
•
Event records
•
Disturbance records
•
Fault records
The calendar clock can run locally or be synchronised with the external clock such as the binary
time standard input signal, RSM clock, IEC60870-5-103 or SNTP for IEC61850 etc. or Modbus.
This can be selected by setting.
The “clock synchronise” function synchronises the relay internal clock to the binary input signal by
the following method. Since the BI signal is an “ON” or “OFF” signal which cannot express
year-month-day and hour-minute-second etc, synchronising is achieved by setting the number of
milliseconds to zero. This method will give accurate timing if the synchronising BI signal is input
every second.
Synchronisation is triggered by an “OFF” to “ON” (rising edge) transition of the BI signal. When
the trigger is detected, the millisecond value of the internal clock is checked, and if the value is
between 0~500ms then it is rounded down. If it is between 500~999ms then it is rounded up (ie the
number of seconds is incremented).
When the relays are connected with the RSM system as shown in Figure 4.4.1 and "RSM" is
corrected to (n+1) sec
500ms
n sec
(n+1) sec
corrected to n sec
t
or TX
151
Summary of Contents for GRE110
Page 183: ...6 F 2 T 0 1 7 2 Appendix B Signal List 184 ...
Page 191: ...6 F 2 T 0 1 7 2 Appendix C Event Record Items 192 ...
Page 196: ...6 F 2 T 0 1 7 2 Appendix D Binary Output Default Setting List 197 ...
Page 199: ...6 F 2 T 0 1 7 2 Appendix E Relay Menu Tree 200 ...
Page 210: ...6 F 2 T 0 1 7 2 Appendix F Case Outline 211 ...
Page 211: ...6 F 2 T 0 1 7 2 Case Outline for model 400 401 420 421 820 and 821 212 ...
Page 212: ...6 F 2 T 0 1 7 2 Case Outline for model 402 and 422 213 ...
Page 213: ...6 F 2 T 0 1 7 2 Appendix G Typical External Connection 214 ...
Page 245: ...6 F 2 T 0 1 7 2 Appendix J Return Repair Form 246 ...
Page 249: ...6 F 2 T 0 1 7 2 Customer Name Company Name Address Telephone No Facsimile No Signature 250 ...
Page 250: ...6 F 2 T 0 1 7 2 Appendix K Technical Data 251 ...
Page 256: ...6 F 2 T 0 1 7 2 Appendix L Symbols Used in Scheme Logic 257 ...
Page 259: ...6 F 2 T 0 1 7 2 Appendix M Modbus Interoperability 260 ...
Page 289: ...6 F 2 T 0 1 7 2 Appendix N IEC60870 5 103 Interoperability 290 ...
Page 296: ...6 F 2 T 0 1 7 2 Appendix O PLC Default setting 297 ...
Page 298: ...6 F 2 T 0 1 7 2 Appendix P Inverse Time Characteristics 299 ...
Page 304: ...6 F 2 T 0 1 7 2 Appendix Q IEC61850 Interoperability 305 ...