Siemens 7SR210 User Manual

7SR210 & 7SR220 Applications Guide
Page 4 of 40 ©2011 Siemens Protection Devices Limited
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 General Form of DTL Operate Characteristic....................................................................15
Figure 2.4-2 Blocking Scheme Using Instantaneous Overcurrent Elements .........................................16
Figure 2.5-1 Sensitive Earth Fault Protection Application......................................................................17
Figure 2.6-1 Directional Characteristics ................................................................................................18
Figure 2.6-2 Phase Fault Angles............................................................................................................18
Figure 2.6-3 Application of Directional Overcurrent Protection..............................................................19
Figure 2.6-4 Feeder Fault on Interconnected Network ..........................................................................20
Figure 2.7-1 Earth Fault Angles .............................................................................................................21
Figure 2.8-1 Balanced and Restricted Earth-fault protection of Transformers.....................................22
Figure 2.8-2 Composite Overcurrent and Restricted Earth-fault Protection .........................................23
Figure 2.11-1 Thermal Overload Heating and Cooling Characteristic..............................................24
Figure 2.13-1 NVD Application...............................................................................................................26
Figure 2.13-2 NVD Protection Connections ...........................................................................................26
Figure 2.15-1 Load Shedding Scheme Using Under-Frequency Elements ...........................................28
Figure 4.1-1 Sequence Co-ordination ....................................................................................................30
Figure 4.1-2 Example of Logic Application.............................................................................................32
Figure 4.2-1 Example Use of Quick Logic..............................................................................................33
Figure 5.1-1 - Circuit Breaker Fail ..........................................................................................................34
Figure 5.1-2 - Single Stage Circuit Breaker Fail Timing.........................................................................35
Figure 5.1-3 - Two Stage Circuit Breaker Fail Timing ............................................................................35
Figure 5.4-1:Trip Circuit Supervision Scheme 1 (H5) ............................................................................38
Figure 5.4-2:Trip Circuit Supervision Scheme 2 (H6) ............................................................................39
Figure 5.4-3:Trip Circuit Supervision Scheme 3 (H7) ............................................................................39
List of Tables
Table 2-1 Application of IDMTL Characteristics 13
Table 5-2 Determination of CT Failure (1 or 2 Phases) 36
Table 5-3 Determination of VT Failure (1 or 2 Phases) 37
Table 5-4 Determination of VT Failure (3 Phases) 37
Table 5-5 Magnetic Inrush Bias 40

Siemens 7SR210 Specifications

General

Brand	Siemens
Model	7SR210
Category	Relays
Language	English