Siemens 7SR12 Argus User Manual

7SR11 & 7SR12 Applications Guide
Page 4 of 48 ©2017 Siemens Protection Devices Limited
List of Figures
Figure 1.5-1 Example Use of Alternative Settings Groups ....................................................................................... 5
Figure 1.2-2 Example of Transformer Alarm and Trip Wiring ................................................................................... 6
Figure 1.2-3 Binary Input Configurations Providing Trip Relay Levels of ENA TS 48-4 ............................................ 9
Figure 1.4-1 LED configuration via the LED Matrix tab ........................................................................................... 10
Figure 1.4-2 LED configuration via the Settings \ OUTPUT CONFIG \ LED CONFIG menu .................................. 10
Figure 2.1-1 IEC NI Curve with Time Multiplier and Follower DTL Applied ............................................................ 11
Figure 2.1-2 IEC NI Curve with Minimum Operate Time Setting Applied ............................................................... 12
Figure 2.1-3 Reset Delay ........................................................................................................................................ 13
Figure 2.4-1 Arc Flash Detection ............................................................................................................................ 15
Figure 2.5-1 General Form of DTL Operate Characteristic ..................................................................................... 16
Figure 2.5-2 Blocking Scheme Using Instantaneous Overcurrent Elements .......................................................... 17
Figure 2.6-1 Sensitive Earth Fault Protection Application ....................................................................................... 18
Figure 2.7-1 Directional Characteristics .................................................................................................................. 19
Figure 2.7-2 Phase Fault Angles ............................................................................................................................ 20
Figure 2.7-3 Application of Directional Overcurrent Protection ............................................................................... 20
Figure 2.7-4 Feeder Fault on Interconnected Network ........................................................................................... 21
Figure 2.8-1 Earth Fault Angles .............................................................................................................................. 22
Figure 2.8-2 Earth fault current distribution in Compensated network .................................................................... 23
Figure 2.8-3 Earth fault current direction in compensated network ......................................................................... 23
Figure 2.8-4 Adjustment of Characteristic Angle .................................................................................................... 23
Figure 2.8-5 Cosine component of current ............................................................................................................. 24
Figure 2.8-6 Earth fault current in isolated network ................................................................................................ 25
Figure 2.9-1 Balanced and Restricted Earth-fault protection of Transformers ....................................................... 26
Figure 2.9-2 Composite Overcurrent and Restricted Earth-fault Protection ........................................................... 27
Figure 2.12-1 Thermal Overload Heating and Cooling Characteristic .................................................................... 28
Figure 2.14-1 NVD Application ............................................................................................................................... 30
Figure 2.14-2 NVD Protection Connections ............................................................................................................ 30
Figure 2.16-1 Load Shedding Scheme Using Under-Frequency Elements ............................................................ 32
Figure 4.1-1 Sequence Co-ordination .................................................................................................................. 36
Figure 4.1-2 Example of Logic Application ........................................................................................................... 39
Figure 4.2-1 Example Use of Quick Logic .............................................................................................................. 40
Figure 5.1-1 Circuit Breaker Fail ............................................................................................................................. 41
Figure 5.1-2 Single Stage Circuit Breaker Fail Timing ............................................................................................ 42
Figure 5.1-3 Two Stage Circuit Breaker Fail Timing ............................................................................................... 42
Figure 5.4-1 Trip Circuit Supervision Scheme 1 (H5) ............................................................................................. 45
Figure 5.4-2 Trip Circuit Supervision Scheme 2 (H6) ............................................................................................. 46
Figure 5.4-3 Trip Circuit Supervision Scheme 3 (H7) ............................................................................................. 46
Figure 5.4-4 Close Circuit Supervision Scheme ..................................................................................................... 47
List of Tables
Table 2-1
Application of IDMTL Characteristics ............................................................................................... 13
Table 5-1 Determination of VT Failure (1 or 2 Phases) .................................................................................... 43
Table 5-2 Determination of VT Failure (1 or 2 Phases) .................................................................................... 44
Table 5-3 Determination of VT Failure (3 Phases) ........................................................................................... 44
Table 5-4 Magnetic Inrush Bias ........................................................................................................................ 47

Siemens 7SR12 Argus Specifications

General

Brand	Siemens
Model	7SR12 Argus
Category	Protection Device
Language	English