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NVA100X-D - Manual - 02 - 2016
Phase overcurrent - 50/51 side H .............................................................................................................................................................. 23
Phase overcurrent - 50/51 side L ................................................................................................................................................................24
Locked rotor - 51LR(48)/14 ...........................................................................................................................................................................25
Voltage-controlled / restraint overcurrent - 51V ......................................................................................................................................26
Residual overcurrent - 50N.1/51N .1 or High impedance restricted earth fault - 87NHIZ.1 - side 1 ...............................................26
Residual overcurrent - 50N.2/51N .2 or High impedance restricted earth fault - 87NHIZ.2 - side 2 .............................................. 28
Calculated residual overcurrent - 50N(Comp)/51N(Comp) .................................................................................................................... 29
Minimum power factor - 55 ........................................................................................................................................................................ 30
Overvoltage - 59 ............................................................................................................................................................................................ 30
Residual overvoltage - 59N ..........................................................................................................................................................................31
Negative sequence overvoltage - 59V2 .....................................................................................................................................................31
High impedance restricted earth fault - 64REF ........................................................................................................................................32
Maximum number of startings (Restart inhibition) - 66...........................................................................................................................32
Directional earth fault overcurrent- 67N ...................................................................................................................................................32
Directional earth fault overcurrent with calculated residual current- 67N(Comp)............................................................................34
Overfrequency - 81O .....................................................................................................................................................................................36
Underfrequency - 81U ..................................................................................................................................................................................37
Differential - 87G-87M-87T ...........................................................................................................................................................................37
Breaker failure - BF .......................................................................................................................................................................................37
Selective block - BLOCK2 ........................................................................................................................................................................... 38
Internal selective block - BLOCK4 ............................................................................................................................................................. 38
Circuit Breaker supervision ........................................................................................................................................................................ 38
VT supervision - 74VT .................................................................................................................................................................................. 38
CT supervision - 74CT side H ...................................................................................................................................................................... 38
CT supervision - 74CT side L ....................................................................................................................................................................... 39
Pilot wire diagnostic .................................................................................................................................................................................... 39
Demand measures ....................................................................................................................................................................................... 39
Oscillography (DFR) ..................................................................................................................................................................................... 39
Power supply board ......................................................................................................................................................................................42
CPU module ....................................................................................................................................................................................................42
Input board .................................................................................................................................................................................................... 43
MMI (keyboard, LED and display) ............................................................................................................................................................. 43
Metering inputs .............................................................................................................................................................................................46
Signal processing ..........................................................................................................................................................................................46
Conventions ....................................................................................................................................................................................................52
Polarity reversing ......................................................................................................................................................................................... 53
Use of measured signals ..............................................................................................................................................................................56
Binary inputs ..................................................................................................................................................................................................57
Output relays ..................................................................................................................................................................................................64
LED indicators ................................................................................................................................................................................................67
Communication interfaces .......................................................................................................................................................................... 70
Undervoltage - 27 ..........................................................................................................................................................................................85
Positive sequence undervoltage - 27V1 ................................................................................................................................................... 89
Directional active overpower - 32P ............................................................................................................................................................91
Undercurrent - 37 ..........................................................................................................................................................................................94
Directional active underpower - 37P .........................................................................................................................................................96
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