7.4.4.2 Four step non-directional residual overcurrent protection..............................................52
7.4.4.3 Completing the test..................................................................................................................52
7.4.5 Thermal overload protection, two time constants TRPTTR (49).......................................... 52
7.4.5.1 Checking operate and reset values........................................................................................53
7.4.5.2 Completing the test..................................................................................................................53
7.4.6 Breaker failure protection, phase segregated activation and output CCRBRF (50BF)....54
7.4.6.1 Checking the phase current operate value,
Pickup_PH
.....................................................54
7.4.6.2 Checking the residual (ground fault) current operate value
Pickup_N
set below
Pickup_PH
................................................................................................................................... 54
7.4.6.3 Checking the re-trip and back-up times...............................................................................55
7.4.6.4 Verifying the re-trip mode.......................................................................................................55
7.4.6.5 Verifying the back-up trip mode............................................................................................ 56
7.4.6.6 Verifying the case
RetripMode
=
Contact
............................................................................ 56
7.4.6.7 Verifying the function mode
Current&Contact
................................................................... 57
7.4.6.8 Completing the test..................................................................................................................57
7.4.7 Pole discrepancy protection CCRPLD (52PD)............................................................................58
7.4.7.1 Verifying the settings...............................................................................................................58
7.4.7.2 Completing the test..................................................................................................................58
7.4.8 Directional underpower protection GUPPDUP (37)................................................................. 58
7.4.8.1 Verifying the settings...............................................................................................................58
7.4.8.2 Completing the test................................................................................................................. 60
7.4.9 Directional overpower protection GOPPDOP (32)................................................................... 60
7.4.9.1 Verifying the settings...............................................................................................................60
7.4.9.2 Completing the test.................................................................................................................. 61
7.5 Testing voltage protection functions........................................................................................... 61
7.5.1 Two step undervoltage protection UV2PTUV (27)....................................................................61
7.5.1.1 Verifying the setting................................................................................................................. 61
7.5.1.2 Completing the test..................................................................................................................63
7.5.2 Two step overvoltage protection OV2PTOV (59)..................................................................... 63
7.5.2.1 Verification of single-phase voltage and time delay to operate for Step 1...................63
7.5.2.2 Completing the test................................................................................................................. 64
7.5.3 Two step residual overvoltage protection ROV2PTOV (59N)................................................ 64
7.5.3.1 Verifying the settings...............................................................................................................64
7.5.3.2 Completing the test..................................................................................................................65
7.5.4 Overexcitation protection OEXPVPH (24)..................................................................................65
7.5.4.1 Verifying the settings...............................................................................................................65
7.5.4.2 Completing the test................................................................................................................. 66
7.6 Testing frequency protection functions...................................................................................... 66
7.6.1 Underfrequency protection SAPTUF (81)...................................................................................66
7.6.1.1 Verifying the settings...............................................................................................................66
7.6.1.2 Completing the test................................................................................................................. 68
7.6.2 Overfrequency protection SAPTOF (81).....................................................................................68
7.6.2.1 Verifying the settings...............................................................................................................68
Table of contents
Transformer protection RET650 3
Commissioning manual
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