Name: Siemens 7SR11
Brand: Siemens
Rating: 4 (1 reviews)

Table of Contents2

Section 1: Introduction7

Section 2: Hardware Description15

Section 3: Protection Functions26

Current Protection: Phase Overcurrent (67, 51, 50)26
- Directional Control of Overcurrent Protection (67) - 7SR1226
- Instantaneous Overcurrent Protection (50)27
- Figure 1-24 Logic Diagram: Directional Overcurrent Element (67)27
- Time Delayed Overcurrent Protection (51)28
- Figure 1-25 Logic Diagram: Instantaneous Over-Current Element28
- Figure 1-26 Logic Diagram: Time Delayed Overcurrent Element29
- Current Protection: Voltage Controlled Overcurrent (51V) - 7SR1230
- Figure 1-27 Logic Diagram: Voltage Controlled Overcurrent Protection30
Current Protection: Derived Earth Fault (67N, 51N, 50N)31
- Directional Control of Derived Earth Fault Protection (67N) - 7SR1231
- Figure 1-28 Logic Diagram: Derived Directional Earth Fault Element31
- Instantaneous Derived Earth Fault Protection (50N)32
- Time Delayed Derived Earth Fault Protection (51N)32
- Figure 1-29 Logic Diagram: Derived Instantaneous Earth Fault Element32
- Figure 1-30 Logic Diagram: Derived Time Delayed Earth Fault Protection33
Current Protection: Measured Earth Fault (67G, 51G, 50G)34
- Directional Control of Measured Earth Fault Protection (67G) - 7SR1234
- Figure 1-31 Logic Diagram: Measured Directional Earth Fault Protection34
- Instantaneous Measured Earth Fault Protection (50G)35
- Figure 1-32 Logic Diagram: Measured Instantaneous Earth-Fault Element35
- Time Delayed Measured Earth Fault Protection (51G)36
- Figure 1-33 Logic Diagram: Measured Time Delayed Earth Fault Element (51G)36
Current Protection: Sensitive Earth Fault (67SEF, 51SEF, 50SEF)37
- Directional Control of Sensitive Earth Fault Protection (67SEF) - 7SR1237
- Instantaneous Sensitive Earth Fault Protection (50SEF)38
- Figure 1-34 Logic Diagram: SEF Directional Element (67SEF)38
- Figure 1-35 Logic Diagram: 7SR11 SEF Instantaneous Element38
- Figure 1-36 Logic Diagram: 7SR12 SEF Instantaneous Element39
- Time Delayed Sensitive Earth Fault Protection (51SEF)40
- Figure 1-37 Logic Diagram: 7SR11 SEF Time Delayed Element (51SEF)40
- Figure 1-38 Logic Diagram: 7SR12 SEF Time Delayed Element (51SEF)41
Current Protection: High Impedance Restricted Earth Fault - (64H)42
Current Protection: Cold Load (51C)42
Figure 1-39 Logic Diagram: High Impedance REF (64H)42
Current Protection: Negative Phase Sequence Overcurrent - (46NPS)43
Figure 1-40 Logic Diagram: Cold Load Settings (51C)43
Current Protection: Under-Current (37)44
Figure 1-41 Logic Diagram: Negative Phase Sequence Overcurrent (46NPS)44
Figure 1-42 Logic Diagram: Phase Current Inputs Undercurrent Detector (37)44
Current Protection: Thermal Overload (49)45
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
Current Protection: Line Check 50LC, 50G LC and 50SEF LC - Only Software Option 'C46
Figure 1-45 Logic Diagram: Thermal Overload Protection (49)46
Figure 1-46 Logic Diagram: 50G Line Check Elements (50G LC)46
Voltage Protection: Phase Under/Over Voltage (27/59) - 7SR1247
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
Voltage Protection: Negative Phase Sequence Overvoltage (47) - 7SR1249
3.13 Voltage Protection: Neutral Overvoltage (59N) - 7SR1249
Figure 1-50 Logic Diagram: NPS Overvoltage Protection (47)49
3.14 Voltage Protection: Under/Over Frequency (81) - 7SR1250
Figure 1-51 Logic Diagram: Neutral Overvoltage Element (59N)50
Figure 1-52 Logic Diagram: Under/Over Frequency Detector (81)51

Section 4: Control & Logic Functions52

Section 5: Supervision Functions64

Section 6: Other Features71

Brand	Siemens
Model	7SR11
Category	Relays
Language	English

Siemens 7SR11 User Manual

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