Siemens Argus 7SR21 Technical Manual page 598

7SR210 & 7SR220 Applications Guide
5.5 Inrush Detector (81HBL2) ................................................................................................... 42
5.6 Broken Conductor / Load Imbalance (46BC) ....................................................................... 42
5.7 Circuit-Breaker Maintenance .............................................................................................. 42
5.8 Overfluxing Detector (81HBL5) ........................................................................................... 42
5.9 Load Blinder (21)................................................................................................................ 43
5.10 Load Blinder Design ........................................................................................................... 44
5.10.1 Application view ..................................................................................................... 44
5.10.2 Design View........................................................................................................... 45
5.10.3 Setting Example – 3 Pole Load Blinder .................................................................. 47
5.10.4 Calculating the Impedance ..................................................................................... 48
List of Figures
Figure 1.1-1 Example Use of Alternative Settings Groups.................................................................... 5
Figure 1.2-1 Example of Transformer Alarm and Trip Wiring................................................................ 6
Figure 1.2-2 Binary Input Configurations Providing Compliance with EATS 48-4 Classes
ESI 1 and ESI 2 ............................................................................................................... 8
Figure 1.4-1 LED configuration via the LED Matrix tab ........................................................................ 9
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 ....................................................................................................... 19
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 2.9-1 Balanced and Restricted Earth-fault protection of Transformers ..................................... 23
Figure 2.9-2 Composite Overcurrent and Restricted Earth-fault Protection ........................................ 24
Figure 2.12-1 Thermal Overload Heating and Cooling Characteristic........................................... 25
Figure 2.14-1 NVD Application .................................................................................................... 27
Figure 2.14-2 NVD Protection Connections ................................................................................. 27
Figure 2.16-1 Load Shedding Scheme Using Under-Frequency Elements................................... 29
Figure 4.1-1 Sequence Co-ordination ................................................................................................ 32
Figure 4.1-2 Example of Logic Application ......................................................................................... 34
Figure 4.2-1 Example Use of Quick Logic .......................................................................................... 35
Figure 5.1-1 Circuit Breaker Fail ........................................................................................................ 36
Figure 5.1-2 Single Stage Circuit Breaker Fail Timing ........................................................................ 37
Figure 5.1-3 Two Stage Circuit Breaker Fail Timing ........................................................................... 37
Figure 5.4-1 Trip Circuit Supervision Scheme 1 (H5) ......................................................................... 40
Figure 5.4-2 Trip Circuit Supervision Scheme 2 (H6) ......................................................................... 41
Figure 5.4-3 Trip Circuit Supervision Scheme 3 (H7) ......................................................................... 41
Figure 5.9-1 Paralleled Transformers and Feeders ............................................................................ 43
Figure 5.10.1-1 Impedance Setting and Angle Setting .................................................................... 44
Figure 5.10.2.1-1 Logic Diagram 3 Phase ....................................................................................... 45
Figure 5.10.2.2-1 Logic Diagram 1 Phase ....................................................................................... 46
Figure 5.10.3-1 Scheme and Impedance Illustration ....................................................................... 47
List of Tables
Table 2-1 Application of IDMTL Characteristics
Table 5-2 Determination of CT Failure (1 or 2 Phases)
Table 5-3 Determination of VT Failure (1 or 2 Phases)
Table 5-4 Determination of VT Failure (3 Phases)
Table 5-5 Magnetic Inrush Bias
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