Siemens 7SR51 - Page 19

10.14 50BF Circuit-Breaker Failure Protection – 3 Pole............................................................... 522
10.14.1 50BF Circuit‑Breaker Failure Protection – 3 Pole......................................................... 522
10.14.2 50BF‑I4 Circuit‑Breaker Failure Protection – 3 Pole......................................................523
10.15 50G Instantaneous Earth Fault – Measured......................................................................525
10.16 50GS Instantaneous Sensitive Earth Fault – Measured..................................................... 526
10.17 50N Instantaneous Earth Fault – Calculated.....................................................................527
10.18 51 Time-Delayed Overcurrent – Phase............................................................................. 528
10.19 51G Time-Delayed Earth Fault – Measured...................................................................... 530
10.20 51GS Time-Delayed Sensitive Earth Fault – Measured...................................................... 532
10.21 51N Time-Delayed Earth Fault – Calculated..................................................................... 534
10.22 55 Power Factor..............................................................................................................536
10.22.1 Common Settings......................................................................................................536
10.22.2 Power Factor............................................................................................................. 536
10.23 59 Overvoltage Protection – 3 Phase............................................................................... 537
10.24 59N Neutral Voltage Displacement.................................................................................. 538
10.24.1 Common Settings......................................................................................................538
10.24.2 Definite Time Element (59NDT)................................................................................. 538
10.24.3 Inverse Time Element (59NIT)....................................................................................538
10.25 59Vx Overvoltage Protection – Vx................................................................................... 540
10.26 60CTS‑I CT Supervision – Current Reference.................................................................... 541
10.27 60CTS‑V CT Supervision – Voltage Reference................................................................... 542
10.28 60VTS VT Supervision......................................................................................................543
10.29 67 Directional Overcurrent – Phase................................................................................. 544
10.30 67G Directional Earth Fault – Measured...........................................................................545
10.31 67GS Directional Sensitive Earth Fault – Measured.......................................................... 546
10.32 67N Directional Earth Fault – Calculated..........................................................................547
10.33 78VS Voltage Vector Shift................................................................................................548
10.34 81 Frequency Protection – "f>" or "f<"..............................................................................549
10.35 81HB2 Inrush Current Detection......................................................................................550
10.36 81R Frequency Protection – "df/dt".................................................................................. 551
10.37 87GH Restricted Earth-Fault Protection – High-Impedance............................................... 552
A Appendix.................................................................................................................................................. 553
A.1 Ordering Information...................................................................................................... 554
A.2 Current Transformer Connections....................................................................................555
A.3 Voltage Transformer Connections....................................................................................556
Table of Contents
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 19
C53000-G7040-C014-1, Edition 11.2019