9.9.23 67 Directional Overcurrent – Phase............................................................................ 491
9.9.24 67G/67GS/67N Directional Earth Fault........................................................................493
9.9.25 78VS Voltage Vector Shift.......................................................................................... 494
9.9.26 81 Frequency Protection – "f>" or "f<"........................................................................ 494
9.9.27 81R Frequency Protection – "df/dt".............................................................................495
9.9.28 87GH Restricted Earth Fault Protection – High-Impedance..........................................496
9.10 Supervision Functions .................................................................................................... 497
9.10.1 50BF Circuit-Breaker Failure Protection – 3 Pole......................................................... 497
9.10.2 60CTS CT Supervision................................................................................................ 497
9.10.3 60VTS VT Supervision................................................................................................ 498
9.10.4 74CC/74TC Close/Trip Circuit Supervision................................................................... 499
9.10.5 81HB2 Inrush Current Detection................................................................................ 499
9.11 Control and Logic Functions............................................................................................ 500
9.11.1 79 Automatic Reclosing............................................................................................. 500
9.11.2 Quick Logic................................................................................................................500
10 Technical Data.......................................................................................................................................... 501
10.1 General Device Data........................................................................................................503
10.1.1 Instrumentation........................................................................................................ 503
10.2 21LB Load Blinder .......................................................................................................... 504
10.2.1 3 Phase Load Blinder (21LB‑3P)..................................................................................504
10.2.2 Single Phase Load Blinder (21LB‑1P)...........................................................................504
10.3 27 Undervoltage Protection – 3-Phase ............................................................................ 506
10.3.1 Common Settings......................................................................................................506
10.3.2 Undervoltage Protection............................................................................................ 506
10.4 27Vx Undervoltage Protection – Vx ................................................................................ 507
10.4.1 Common Settings......................................................................................................507
10.4.2 Undervoltage Protection............................................................................................ 507
10.5 32 Power Protection .......................................................................................................508
10.6 37 Undercurrent Protection – Phase ............................................................................... 509
10.6.1 Common Settings......................................................................................................509
10.6.2 Undercurrent Protection............................................................................................ 509
10.7 37G Undercurrent Earth Fault – Measured.......................................................................510
10.8 46 Negative-Sequence Overcurrent Protection.................................................................511
10.8.1 Definite Time Element (46DT)....................................................................................511
10.8.2 Inverse Time Element (46IT)...................................................................................... 511
10.9 46BC Broken Conductor Detection...................................................................................513
10.9.1 Common Settings......................................................................................................513
10.9.2 Broken Conductor Detection...................................................................................... 513
10.10 47 Sequence Overvoltage Protection............................................................................... 514
10.10.1 Common Settings......................................................................................................514
10.10.2 Overvoltage Protection.............................................................................................. 514
10.11 49 Thermal Overload Protection...................................................................................... 516
10.12 50 Instantaneous Overcurrent – Phase............................................................................ 519
10.13 50AFD Arc Flash Detection.............................................................................................. 520
10.13.1 50GAFD Earth Arc Flash Detection............................................................................. 520
Table of Contents
18 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
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