
Section 10 Testing functionality by secondary injection...............................................69
10.1 Testing disturbance report........................................................................................................... 69
10.1.1 Disturbance recorder (DR).........................................................................................................69
10.1.2 Event recorder (ER) and Event list (EL)................................................................................... 69
10.2 Differential protection....................................................................................................................70
10.2.1 Busbar differential protection..................................................................................................70
10.2.1.1 General....................................................................................................................................... 70
10.2.1.2 Operation of the differential protection from CTx input................................................ 70
10.2.1.3 Stability of the busbar differential protection................................................................... 72
10.2.1.4 Operation of fast open CT detection algorithm................................................................ 73
10.2.1.5 Operation of slow open CT detection algorithm...............................................................74
10.2.1.6 Completing the test.................................................................................................................75
10.2.1.7 Check of trip circuits and circuit breakers ......................................................................... 75
10.3 Current protection...........................................................................................................................75
10.3.1 Four step phase overcurrent protection 3-phase output OC4PTOC................................ 75
10.3.1.1 Verifying the settings.............................................................................................................. 75
10.3.1.2 Completing the test.................................................................................................................76
10.3.2 Four step single phase overcurrent protection PH4SPTOC............................................... 76
10.3.2.1 Verifying the settings.............................................................................................................. 76
10.3.2.2 Completing the test.................................................................................................................77
10.3.3 Four step residual overcurrent protection, (Zero sequence or negative sequence
directionality) EF4PTOC ............................................................................................................ 77
10.3.3.1 Four step directional earth fault protection.......................................................................77
10.3.3.2 Four step non-directional earth fault protection.............................................................. 78
10.3.3.3 Completing the test.................................................................................................................78
10.3.4 Four step negative sequence overcurrent protection NS4PTOC ..................................... 78
10.3.4.1 Completing the test.................................................................................................................79
10.3.5 Thermal overload protection, two time constants TRPTTR ...............................................79
10.3.5.1 Checking operate and reset values...................................................................................... 79
10.3.5.2 Completing the test................................................................................................................ 80
10.3.6 Breaker failure protection, phase segregated activation and output CCRBRF..............80
10.3.6.1 Checking the phase current operate value,
IP>
................................................................. 80
10.3.6.2 Checking the residual (earth fault) current operate value
IN>
set below
IP>
..............80
10.3.6.3 Checking the re-trip and back-up times.............................................................................. 81
10.3.6.4 Verifying the re-trip mode...................................................................................................... 81
10.3.6.5 Verifying the back-up trip mode........................................................................................... 81
10.3.6.6 Verifying instantaneous back-up trip at CB faulty condition..........................................82
10.3.6.7 Verifying the case
RetripMode
=
Contact
........................................................................... 82
10.3.6.8 Verifying the function mode
Current&Contact
..................................................................83
10.3.6.9 Completing the test.................................................................................................................83
10.3.7 Breaker failure protection, single phase version CCSRBRF ............................................... 83
10.3.7.1
Checking the phase current operate value IP>
.................................................................. 84
10.3.7.2 Checking the re-trip and back-up times..............................................................................84
10.3.7.3 Verifying the re-trip mode......................................................................................................84
10.3.7.4 Verifying the back-up trip mode........................................................................................... 85
Table of contents
3
Commissioning manual