Siemens 7SR11 Manual page 5

Figure 1-51 Logic Diagram: Neutral Overvoltage Element (59N)........................................................................... 50
Figure 1-52 Logic Diagram: Under/Over Frequency Detector (81) ..................................................................... 51
Figure 4-1 Typical AR Sequence with 3 Inst and 1 Delayed trip ............................................................................ 54
Figure 4-2 Basic Auto-Reclose Sequence Diagram............................................................................................... 58
Figure 4-3 Logic Diagram: Circuit Breaker Status.................................................................................................. 60
Figure 4-4 Sequence Diagram: Quick Logic PU/DO Timers (Counter Reset Mode Off) ........................................ 63
Figure 4-5 Logic Diagram: Circuit Breaker Fail Protection (50BF) ......................................................................... 64
Figure 4-6 Logic Diagram: VT Supervision Function (60VTS) ............................................................................... 66
Figure 4-7 Logic Diagram: CT Supervision Function (60CTS) - 7SR11 ................................................................ 67
Figure 4-9 Logic Diagram: CT Supervision Function (60CTS) - 7SR12 ................................................................ 68
Figure 4-10 Logic Diagram: Broken Conductor Function (46BC)........................................................................... 68
Figure 4-11 Logic Diagram: Trip Circuit Supervision Feature (74TCS).................................................................. 69
Figure 4-12 Logic Diagram: Close Circuit Supervision Feature (74CCS) .............................................................. 69
Figure 4-13 Functional Diagram for Harmonic Block Feature (81HBL2)................................................................ 70
Figure 4-14 Energy Direction Convention .............................................................................................................. 73
List of Tables
Table 1-1 7SR11 Ordering Options ................................................................................................................... 8
Table 1-2 7SR12 Ordering Options ................................................................................................................. 11
Table 1-3 Summary of 7SR1 Relay Configurations ......................................................................................... 15
Table 4-1 Operating Mode............................................................................................................................... 75
Symbols and Nomenclature
The following notational and formatting conventions are used within the remainder of this document:
•
Setting Menu Location
•
Setting:
•
Setting value:
•
Alternatives:
©2012 Siemens Protection Devices Limited
7SR11 & 7SR12 Description Of Operation
MAIN MENU>SUB-MENU
Elem name -Setting
value
[1st] [2nd] [3rd]
Chapter 1 Page 5 of 76