Siemens Reyrolle 7SR54 - Page 16

9.4 Direction Test of the Phase Quantities (Current and Voltage Connection) ........................ 409
9.5 Direction Test of the Earth Quantities for Directional Earth-Fault Functions...................... 410
9.6 Circuit‑Breaker Test......................................................................................................... 413
9.7 Primary and Secondary Tests of the Circuit‑Breaker Failure Protection.............................. 414
9.8 Configuration Tests for Transformer Differential Protection..............................................415
9.9 Restricted Earth Fault Protection......................................................................................420
9.10 Protection Functional Tests............................................................................................. 421
9.10.1 21LB Load Blinder......................................................................................................421
9.10.2 24 Overexcitation Protection..................................................................................... 422
9.10.3 27 Undervoltage Protection – 3 Phase........................................................................423
9.10.4 27Vx Undervoltage Protection – Vx............................................................................424
9.10.5 37 Undercurrent Protection – Phase...........................................................................425
9.10.6 37G Undercurrent Earth Fault – Measured................................................................. 426
9.10.7 46 Negative Sequence Overcurrent Protection........................................................... 426
9.10.8 46BC Broken Conductor Detection............................................................................. 428
9.10.9 47 Sequence Overvoltage Protection......................................................................... 429
9.10.10 49 Thermal Overload Protection.................................................................................430
9.10.11 50/51 Phase Overcurrent........................................................................................... 430
9.10.12 50G/51G Measured Earth Fault.................................................................................. 433
9.10.13 50N/51N Calculated Earth Fault................................................................................. 435
9.10.14 51CL Cold Load Overcurrent – Phase..........................................................................438
9.10.15 51V Voltage Dependent Overcurrent – Phase............................................................. 440
9.10.16 59 Overvoltage Protection – 3 Phase..........................................................................441
9.10.17 59N Neutral Voltage Displacement............................................................................ 441
9.10.18 59Vx Overvoltage Protection – Vx..............................................................................442
9.10.19 67 Directional Overcurrent – Phase............................................................................ 443
9.10.20 67G/67GS/67N Directional Earth Fault........................................................................445
9.10.21 81 Frequency Protection – "f>" or "f<"........................................................................ 446
9.10.22 87GH Restricted Earth Fault Protection – High-Impedance..........................................446
9.10.23 87T Transformer Differential Protection – Biased........................................................447
9.11 Supervision Functions .................................................................................................... 451
9.11.1 50BF Circuit-Breaker Failure Protection – 3 Pole......................................................... 451
9.11.2 60CTS CT Supervision................................................................................................ 451
9.11.3 60VTS VT Supervision................................................................................................ 452
9.11.4 74CC/74TC Close/Trip Circuit Supervision................................................................... 453
9.11.5 81HB2 Inrush Current Detection................................................................................ 453
9.12 Control and Logic Functions............................................................................................ 454
9.12.1 Quick Logic................................................................................................................454
10 Technical Data.......................................................................................................................................... 455
10.1 General Device Data........................................................................................................456
10.1.1 Instrumentation........................................................................................................ 456
10.2 21LB Load Blinder .......................................................................................................... 457
10.2.1 3 Phase Load Blinder (21LB‑3P)..................................................................................457
10.2.2 Single Phase Load Blinder (21LB‑1P)...........................................................................457
Table of Contents
16 Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019