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Siemens 7SR21 Manual
Also see for Argus 7SR21: Installation guideManualTechnical manualManualManual
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7SR21 & 7SR22 Argus Applications GuideContentsDocument Release History....................................................................................................................1Software Revision History.....................................................................................................................1Contents ..................................................................................................................................................2Section 1: Common Functions .............................................................................................................41.1 Multiple Settings Groups...........................................................................................................41.2 Binary Inputs .............................................................................................................................51.3 Binary Outputs ..........................................................................................................................81.4 LEDs .........................................................................................................................................8Section 2: Protection Functions .........................................................................................................102.1 Time delayed overcurrent (51/51G/51N) ................................................................................102.1.1 Selection of Overcurrent Characteristics ...................................................................112.1.2 Reset Delay................................................................................................................122.2 Voltage dependent overcurrent (51V).....................................................................................132.3 Cold Load Settings (51c) ........................................................................................................132.4 Instantaneous Overcurrent (50/50G/50N) ..............................................................................142.4.1 Blocked Overcurrent Protection Schemes .................................................................142.5 Sensitive Earth-fault Protection (50SEF) ................................................................................162.6 Directional Protection (67) ......................................................................................................172.7 Directional Earth-Fault (50/51G, 50/51N, 51/51SEF) .............................................................202.8 High Impedance Restricted Earth Fault Protection (64H) ......................................................212.9 Negative Phase Sequence Overcurrent (46NPS) ..................................................................232.10 Undercurrent (37)....................................................................................................................232.11 Thermal Overload (49)............................................................................................................232.12 Under/Over Voltage Protection (27/59) ..................................................................................242.13 Neutral Overvoltage (59N) ......................................................................................................252.13.1 Application with Capacitor Cone Units.......................................................................262.13.2 Derived NVD Voltage .................................................................................................262.14 Negative Phase Sequence Overvoltage (47) .........................................................................262.15 Under/Over Frequency (81) ....................................................................................................27Section 3: CT Requirements ...............................................................................................................283.1 CT Requirements for Overcurrent and Earth Fault Protection ...............................................283.1.1 Overcurrent Protection CTs .......................................................................................283.1.2 Earth Fault Protection CTs.........................................................................................283.2 CT Requirements for High Impedance Restricted Earth Fault Protection ..............................28Section 4: Control Functions ..............................................................................................................294.1 Auto-reclose Applications .......................................................................................................294.1.1 Auto-Reclose Example 1............................................................................................304.1.2 Auto-Reclose Example 2 (Use of Quicklogic with AR) ..............................................314.2 Quick Logic Applications.........................................................................................................324.2.1 Auto-Changeover Scheme Example..........................................................................32Section 5: Supervision Functions ......................................................................................................335.1 Circuit-Breaker Fail (50BF) .....................................................................................................335.1.1 Settings Guidelines ....................................................................................................33©2010 Siemens Protection Devices Limited Chapter 7 Page 2 of 39 |
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