Siemens Reyrolle 7SR45 Argus Device Manual page 10

Table of Contents
4.4
4.5
4.6
4.7
4.8
4.9
4.10
5 Applications................................................................................................................................................ 89
5.1
5.2
5.2.1
5.3
5.4
5.4.1
5.4.2
5.5
5.6
5.7
5.8
6 Functional Tests........................................................................................................................................103
6.1
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.3
A Appendix.................................................................................................................................................. 109
A.1
A.2
A.3
A.4
A.5
Index.........................................................................................................................................................117
10
Instantaneous Derived Earth Fault Protection (50N)...........................................................82
Time-Delayed Derived Earth Fault Protection (51N)............................................................83
Instantaneous Measured Earth Fault Protection (50G)....................................................... 84
Time-Delayed Measured Earth Fault Protection (51G)........................................................ 85
Switch On To Fault Protection (50LC/SOTF)........................................................................86
Thermal Overload Protection (49)......................................................................................87
2nd Harmonic Block/Inrush Restraint (81HBL2).................................................................. 88
Overview ......................................................................................................................... 90
Current-Transformer Requirements and Sample Calculations............................................. 91
Current-Transformer Requirements ............................................................................. 91
Time-Delayed Overcurrent (51/51G/51N) ..........................................................................95
Overcurrent Characteristics............................................................................................... 97
Selection of Overcurrent Characteristics ...................................................................... 97
Reset Delay .................................................................................................................97
Instantaneous Overcurrent (50/50G/50N) ......................................................................... 98
Thermal Overload (49)...................................................................................................... 99
Inrush Response ............................................................................................................. 101
Inrush Detector (81HBL2) ............................................................................................... 102
Commissioning Notes..................................................................................................... 104
Before Testing.................................................................................................................105
Safety........................................................................................................................105
Sequence of Tests .....................................................................................................105
Test Equipment ........................................................................................................ 106
Use of Laptop Computer to Facilitate Testing .............................................................106
Applying Settings............................................................................................................ 107
Connection Examples for RMU Application...................................................................... 110
Connection Examples for Distribution Transformer Application........................................ 112
Connection Examples for Phase and CBCT Measurement..................................................114
Connection Examples for Earth-Fault Application.............................................................115
Revision History.............................................................................................................. 116
Reyrolle, 7SR45, Device Manual
C53000-G7040-C101-2, Edition 09.2020