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Completing the test................................................................ 76
Breaker failure protection, phase segregated activation and
output CCRBRF...........................................................................76
Checking the phase current operate value,
IP>
..................... 77
Checking the residual (earth fault) current operate value
IN>
set below
IP>
................................................................... 77
Checking the re-trip and back-up times..................................77
Verifying the re-trip mode....................................................... 78
Verifying the back-up trip mode..............................................78
Verifying instantaneous back-up trip at CB faulty condition... 79
Verifying the case
RetripMode
=
Contact
...............................80
Verifying the function mode
Current&Contact
........................ 80
Completing the test................................................................ 81
Multipurpose protection.................................................................... 81
General current and voltage protection CVGAPC....................... 81
Built-in overcurrent feature (non-directional).......................... 81
Overcurrent feature with current restraint...............................82
Overcurrent feature with voltage restraint.............................. 82
Overcurrent feature with directionality....................................83
Over/Undervoltage feature..................................................... 83
Completing the test................................................................ 84
Secondary system supervision.........................................................84
Fuse failure supervision FUFSPVC.............................................84
Checking that the binary inputs and outputs operate as
expected ................................................................................84
Measuring the operate value for the negative sequence
function ..................................................................................85
Measuring the operate value for the zero-sequence
function ..................................................................................86
Measuring the operate value for the dead line detection
function...................................................................................87
Checking the operation of the du/dt and di/dt based function 87
Completing the test................................................................ 88
Control.............................................................................................. 88
Apparatus control APC................................................................ 88
Single command, 16 signals SINGLECMD................................. 88
Logic................................................................................................. 89
Tripping logic, common 3-phase output SMPPTRC ...................89
Three-phase operating mode................................................. 89
1ph/3ph operating mode........................................................ 89
1ph/2ph/3ph operating mode................................................. 90
Circuit breaker lockout............................................................91
Completing the test................................................................ 92
Monitoring.........................................................................................92
Table of contents
4 Transformer protection RET650 2.1 IEC
Commissioning manual