7SR11 & 7SR12 Description Of Operation
©2012 Siemens Protection Devices Limited Chapter 1 Page 4 of 76
List of Figures
Figure 1-1 Functional Diagram of 7SR1101-1_A12-_CA0 Relay
............................................................................. 9
Figure 1-2 Functional Diagram of 7SR1101-3_A12-_CA0 Relay............................................................................. 9
Figure 1-3 Functional Diagram of 7SR1103-1_A12-_DA0 Relay............................................................................. 9
Figure 1-4 Functional Diagram of 7SR1103-3_A12-_DA0 Relay............................................................................. 9
Figure 1-5 Connections Diagram for 7SR11 Relay ................................................................................................ 10
Figure 1-6 Functional Diagram of 7SR1204-2_A12-_CA0 Relay........................................................................... 12
Figure 1-7 Functional Diagram of 7SR1204-4_A12-_CA0 Relay........................................................................... 12
Figure 1-8 Functional Diagram of 7SR1205-2_A12-_DA0 Relay........................................................................... 13
Figure 1-9 Functional Diagram of 7SR1205-4_A12-_DA0 Relay........................................................................... 13
Figure 1-10 Connections Diagram for 7SR12 Relay .............................................................................................. 14
Figure 1-11 Relay shown withdrawn...................................................................................................................... 16
Figure 1-12 7SR11 Rear view of 7SR11 Relay...................................................................................................... 16
Figure 1-13 Earth connection Symbol.................................................................................................................... 16
Figure 1-14 Relay with standard transparent cover ............................................................................................... 17
Figure 1-15 Relay with transparent cover and push buttons.................................................................................. 17
Figure 1-16 Relay with Transparent cover removed .............................................................................................. 18
Figure 1-17 Close up of Relay Label...................................................................................................................... 18
Figure 1-18 Close up of Relay Identifier................................................................................................................. 19
Figure 1-19 LED Indication Label........................................................................................................................... 21
Figure 1-20 Binary Input Logic ............................................................................................................................... 22
Figure 1-21 Binary Output Logic ............................................................................................................................ 23
Figure 1-22 Start-up Counter Meter ....................................................................................................................... 24
Figure 1-23 Start-up Events ................................................................................................................................... 25
Figure 1-24 Logic Diagram: Directional Overcurrent Element (67) ........................................................................ 27
Figure 1-25 Logic Diagram: Instantaneous Over-current Element ......................................................................... 28
Figure 1-26 Logic Diagram: Time Delayed Overcurrent Element .......................................................................... 29
Figure 1-27 Logic Diagram: Voltage Controlled Overcurrent Protection ................................................................ 30
Figure 1-28 Logic Diagram: Derived Directional Earth Fault Element.................................................................... 31
Figure 1-29 Logic Diagram: Derived Instantaneous Earth Fault Element .............................................................. 32
Figure 1-30 Logic Diagram: Derived Time Delayed Earth Fault Protection............................................................ 33
Figure 1-31 Logic Diagram: Measured Directional Earth Fault Protection ............................................................. 34
Figure 1-32 Logic Diagram: Measured Instantaneous Earth-fault Element............................................................ 35
Figure 1-33 Logic Diagram: Measured Time Delayed Earth Fault Element (51G)................................................. 36
Figure 1-34 Logic Diagram: SEF Directional Element (67SEF) ............................................................................. 38
Figure 1-35 Logic Diagram: 7SR11 SEF Instantaneous Element .......................................................................... 38
Figure 1-36 Logic Diagram: 7SR12 SEF Instantaneous Element .......................................................................... 39
Figure 1-37 Logic Diagram: 7SR11 SEF Time Delayed Element (51SEF) ............................................................ 40
Figure 1-38 Logic Diagram: 7SR12 SEF Time Delayed Element (51SEF) ............................................................ 41
Figure 1-39 Logic Diagram: High Impedance REF (64H) ...................................................................................... 42
Figure 1-40 Logic Diagram: Cold Load Settings (51c) ........................................................................................... 43
Figure 1-41 Logic Diagram: Negative Phase Sequence Overcurrent (46NPS)...................................................... 44
Figure 1-42 Logic Diagram: Phase Current Inputs Undercurrent Detector (37) ..................................................... 44
Figure 1-43 Logic Diagram: Earth Current Inputs Undercurrent Detector (37G).................................................... 45
Figure 1-44 Logic Diagram: Sensitive Earth Current Inputs Undercurrent Detector (37SEF) ................................ 45
Figure 1-45 Logic Diagram: Thermal Overload Protection (49) ............................................................................. 46
Figure 1-46 Logic Diagram: 50G Line Check Elements (50G LC) ......................................................................... 46
Figure 1-47 Logic Diagram: 50SEF Line Check Elements (50SEF LC) ................................................................. 47
Figure 1-48 Logic Diagram: 50 Line Check Elements (50LC)................................................................................ 47
Figure 1-49 Logic Diagram: Under/Over Voltage Elements (27/59)....................................................................... 48
Figure 1-50 Logic Diagram: NPS Overvoltage Protection (47) .............................................................................. 49
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