Siemens 7SR157 Argus, Manual

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Chapter 1 - 7SR157 Description of Operation
© 2022 Siemens Protection Devices Limited Chapter 1 - Page 3 of 38
List of Figures
Figure 1-1 Protection Functions .......................................................................................................................... 7
Figure 1-2 Connections Diagram for 7SR157 Relay ............................................................................................ 8
Figure 2-1 Relay shown withdrawn ..................................................................................................................... 9
Figure 2-2 Rear view of Relay (E6 Case with optional IEC61850 module) .......................................................... 10
Figure 2-3 Relay with standard transparent cover ............................................................................................. 10
Figure 2-4 Relay with transparent cover and push buttons ................................................................................ 11
Figure 2-5 Relay with Transparent cover removed ............................................................................................ 12
Figure 2-6 Close up of Relay Label ................................................................................................................... 12
Figure 2-7 Close up of Relay Identifier .............................................................................................................. 13
Figure 2-8 LED Indication Label (partial) ........................................................................................................... 15
Figure 2-9 Binary Input Logic............................................................................................................................ 16
Figure 2-10 Binary Output Logic ....................................................................................................................... 17
Figure 2-11 Unexpected Restarts Lockout Text ................................................................................................. 18
Figure 2-12 Start-up Events ............................................................................................................................. 19
Figure 3-1 VT Level Mode: 2 State ................................................................................................................... 20
Figure 3-2 VT Level Mode: 3 State Live Output ................................................................................................. 21
Figure 3-3 VT Level Mode: 3 State Dead Output ............................................................................................... 21
Figure 4-1 Voltage Check Function logic ........................................................................................................... 23
Figure 4-2 Check Sync Function logic ............................................................................................................... 24
Figure 4-3 System Sync Function logic ............................................................................................................. 27
Figure 4-4 Close On Zero Function logic ........................................................................................................... 28
Figure 4-5 Sequence Diagram: Quick Logic PU/DO Timers (Counter Reset Mode Off) ....................................... 31
Figure 4-6 Logic Diagram: Close Circuit Supervision Feature (74CCS) .............................................................. 32
List of Tables
Table 1-1 7SR157 Ordering Options ............................................................................................................. 6
Table 2-1 Summary of 7SR157 Relay Configurations .................................................................................... 9
Table 4-1 Operating Mode ......................................................................................................................... 36