Siemens 7SR23 DAD Manual page 8

6.8 Real Time Clock.................................................................................................................34
6.8.1 Time Synchronisation - Data Comms ....................................................................34
6.8.2 Time Synchronisation - Binary Input ......................................................................34
6.8.3 Time Synchronisation - IRIG-B (Optional)..............................................................34
6.9 Settings Groups .................................................................................................................34
6.10 Password Feature ..............................................................................................................35
List of Figures
Figure 1-1 Connection Diagram: 7SR23 DAD Relay.........................................................................8
Figure 2-1 7SR23 DAD with 3 + 8 LEDs in E6 Case .......................................................................10
Figure 2-2 Binary Input Logic..........................................................................................................13
Figure 2-3 Binary Output Logic.......................................................................................................15
Figure 3-1 Protection Functions......................................................................................................16
Figure 3-2 Logic Diagram: Differential Protection............................................................................17
Figure 3-3 Logic Diagram: Measured Earth Fault Element..............................................................18
Figure 3-4 Logic Diagram: Restricted Earth Fault Protection...........................................................19
Figure 3-5 Logic Diagram: '3 Pole Diff + REF' Protection................................................................20
Figure 3-6 Logic Diagram: '3 Pole Diff + EF' Protection ..................................................................21
Figure 3-7 Logic Diagram: 'REF1 + REF2' Protection .....................................................................22
Figure 4-1 Logic Diagram: Protection In/Out Switching ...................................................................23
Figure 4-2 Sequence Diagram showing PU/DO Timers in Quick Logic (Counter Reset
Mode Off)......................................................................................................................25
Figure 5-1 Logic Diagram: CT Supervision .....................................................................................26
Figure 5-2 Logic Diagram: 87/50SFM and 87/50BF ........................................................................27
Figure 5-3 Logic Diagram: CB Position Monitoring..........................................................................28
Figure 5-4 Logic Diagram: Ext 87CBF ...........................................................................................28
Figure 5-5 Logic Diagram: Trip Circuit Supervision Feature (74TCS) ..............................................29
List of Tables
Table 1-1 7SR23 DAD Ordering Options.........................................................................................7
Table 2-1 Summary of 7SR23 DAD Relay Configurations................................................................9
Table 6-1 Operating Mode ............................................................................................................33
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Chapter 1) 7SR23 DAD Description Of Operation
Chapter 1 Page 4 of 36