Protection and Automation Functions
5.1 21LB Load Blinder 144
5.2 24 Overexcitation Protection 150
5.3 27 Undervoltage Protection – 3-Phase 158
5.4 27Vx Undervoltage Protection – Vx 165
5.5 37 Undercurrent Protection – Phase 171
5.6 37G Undercurrent Earth Fault – Measured 177
5.7 46 Negative-Sequence Overcurrent Protection 180
5.8 46BC Broken Conductor Detection 188
5.9 47 Sequence Overvoltage Protection 193
5.10 49 Thermal Overload Protection 199
5.11 50 Instantaneous Overcurrent – Phase 204
5.12 50G Instantaneous Earth Fault – Measured 214
5.13 50N Instantaneous Earth Fault – Calculated 221
5.14 51 Time-Delayed Overcurrent – Phase 228
5.15 51G Time-Delayed Earth Fault – Measured 246
5.16 51N Time-Delayed Earth Fault – Calculated 255
5.17 59N Neutral Voltage Displacement 264
5.18 59Vx Overvoltage Protection – Vx 271
5.19 67 Directional Overcurrent/Earth Fault 275
5.20 81 Frequency Protection – "f>" or "f<" 288
5.21 87GH Restricted Earth-Fault Protection – High-Impedance 296
5.22 87T Transformer Differential Protection 307
5
Reyrolle 7SR5, Transformer Protection Device, Device Manual 143
C53000-G7040-C015-1, Edition 11.2019
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