7SR11 & 7SR12 Description Of Operation
©2017 Siemens Protection Devices Limited Chapter 1 Page 5 of 88
List of Figures
Figure 1-1 Functional Diagram of 7SR1101-1_A12-_CA0 Relay ........................................................................... 11
Figure 1-2 Functional Diagram of 7SR1101-3_A12-_CA0 Relay ........................................................................... 11
Figure 1-3 Functional Diagram of 7SR1103-1_A_ _-_DA0 Relay .......................................................................... 11
Figure 1-4 Functional Diagram of 7SR1103-3_A_ _-_DA0 Relay .......................................................................... 12
Figure 1-5 Connections Diagram for 7SR11 Relay ................................................................................................ 13
Figure 1-6 Functional Diagram of 7SR1204-2_A12-_CA0 Relay ........................................................................... 15
Figure 1-7 Functional Diagram of 7SR1204-4_A12-_CA0 Relay ........................................................................... 15
Figure 1-8 Functional Diagram of 7SR1205-2_A_ _-_DA0 Relay .......................................................................... 15
Figure 1-9 Functional Diagram of 7SR1205-4_A_ _-_DA0 Relay .......................................................................... 16
Figure 1-10 Connections Diagram for 7SR12 Relay .............................................................................................. 17
Figure 2-1 E4 relay shown withdrawn .................................................................................................................... 19
Figure 2-2 Rear view of Relay (E6 Case with optional IEC61850 module) ............................................................ 20
Figure 2-3 Earth connection Symbol ...................................................................................................................... 20
Figure 2-4 Relay with standard transparent cover (E6 Case with optional IEC61850 module) .............................. 20
Figure 2-5 Relay with transparent cover and push buttons .................................................................................... 21
Figure 2-6 Relay with Transparent cover removed (E6 Case with optional IEC61850 module) ............................. 22
Figure 2-7 Close up of Relay Label ........................................................................................................................ 22
Figure 2-8 Close up of Relay Identifier ................................................................................................................... 23
Figure 2-9 LED Indication Label............................................................................................................................. 25
Figure 2-10 Binary Input Logic ............................................................................................................................... 26
Figure 2-11 Binary Output Logic ............................................................................................................................ 27
Figure 2-12 Start-up Counter Meter ....................................................................................................................... 28
Figure 2-13 Unexpected Restarts Lockout Text ..................................................................................................... 28
Figure 2-14 Start-up Events ................................................................................................................................... 29
Figure 3-1 Logic Diagram: Directional Overcurrent Element (67) .......................................................................... 32
Figure 3-2 Logic Diagram: Instantaneous Over-current Element ........................................................................... 33
Figure 3-3 Logic Diagram: Time Delayed Overcurrent Element ............................................................................ 34
Figure 3-4 Logic Diagram: Voltage Controlled Overcurrent Protection .................................................................. 35
Figure 3-5 Logic Diagram: Derived Directional Earth Fault Element ...................................................................... 36
Figure 3-6 Logic Diagram: Derived Instantaneous Earth Fault Element ................................................................ 37
Figure 3-7 Logic Diagram: Derived Time Delayed Earth Fault Protection .............................................................. 38
Figure 3-8 Logic Diagram: Measured Directional Earth Fault Protection ............................................................... 39
Figure 3-9 Logic Diagram: Measured Instantaneous Earth-fault Element .............................................................. 40
Figure 3-10 Logic Diagram: Measured Time Delayed Earth Fault Element (51G) ................................................. 41
Figure 3-11 Logic Diagram: SEF Directional Element (67SEF) ............................................................................. 43
Figure 3-12 Logic Diagram: 7SR11 SEF Instantaneous Element .......................................................................... 43
Figure 3-13 Logic Diagram: 7SR12 SEF Instantaneous Element .......................................................................... 44
Figure 3-14 Logic Diagram: 7SR11 SEF Time Delayed Element (51SEF) ............................................................ 45
Figure 3-15 Logic Diagram: 7SR12 SEF Time Delayed Element (51SEF) ............................................................ 46
Figure 3-16 Logic Diagram: High Impedance REF (64H) ...................................................................................... 47
Figure 3-17 Logic Diagram: Cold Load Settings (51c) ........................................................................................... 48
Figure 3-18 Logic Diagram: Negative Phase Sequence Overcurrent (46NPS) ...................................................... 49
Figure 3-19 Logic Diagram: Phase Current Inputs Undercurrent Detector (37) ..................................................... 50
Figure 3-20 Logic Diagram: Earth Current Inputs Undercurrent Detector (37G) .................................................... 50
Figure 3-21 Logic Diagram: Sensitive Earth Current Inputs Undercurrent Detector (37SEF) ................................ 50
Figure 3-22 Logic Diagram: Thermal Overload Protection (49) ............................................................................. 51
Figure 3-23 Logic Diagram: 50G Line Check Elements (50G LC) ......................................................................... 52
Figure 3-24 Logic Diagram: 50SEF Line Check Elements (50SEF LC) ................................................................. 52
Figure 3-25 Logic Diagram: 50 Line Check Elements (50LC) ................................................................................ 52
Figure 3-26 Logic Diagram: Arc Flash Detector (50 AFD) ..................................................................................... 53
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