Siemens 7SR51 - Protection and Automation Functions

Protection and Automation Functions
5.1 21LB Load Blinder 144
5.2 27 Undervoltage Protection – 3-Phase 150
5.3 27Vx Undervoltage Protection – Vx 157
5.4 32 Power Protection 163
5.5 37 Undercurrent Protection – Phase 173
5.6 37G Undercurrent Earth Fault – Measured 179
5.7 46 Negative-Sequence Overcurrent Protection 182
5.8 46BC Broken Conductor Detection 190
5.9 47 Sequence Overvoltage Protection 195
5.10 49 Thermal Overload Protection 201
5.11 50 Instantaneous Overcurrent – Phase 206
5.12 50AFD Arc Flash Detection 216
5.13 50G Instantaneous Earth Fault – Measured 221
5.14 50GS Instantaneous Sensitive Earth Fault – Measured 228
5.15 50N Instantaneous Earth Fault – Calculated 234
5.16 50SOTF Switch onto Fault 241
5.17 51 Time-Delayed Overcurrent – Phase 250
5.18 51G Time-Delayed Earth Fault – Measured 268
5.19 51GS Time-Delayed Sensitive Earth Fault – Measured 277
5.20 51N Time-Delayed Earth Fault – Calculated 286
5.21 55 Power Factor 295
5.22 59 Overvoltage Protection – 3 Phase 306
5.23 59N Neutral Voltage Displacement 313
5.24 59Vx Overvoltage Protection – Vx 320
5.25 67 Directional Overcurrent/Earth Fault 324
5.26 78VS Voltage Vector Shift 337
5.27 81 Frequency Protection – "f>" or "f<" 342
5.28 81R Frequency Protection – "df/dt" 350
5.29 87GH Restricted Earth-Fault Protection – High-Impedance 355
5
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 143
C53000-G7040-C014-1, Edition 11.2019