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NC2 0 - Manual - 01 - 2015
Oscillography (DFR) .................................................................................................................................................................................... 23
PLC (Programmable Logic Controller) ......................................................................................................................................................24
3.9 METERING..........................................................................................................................................................................................................24
Accuracy (type tests)....................................................................................................................................................................................24
Measures ........................................................................................................................................................................................................24
4 FUNCTION CHARACTERISTICS 25
4.1 HARDWARE DESCRIPTION .............................................................................................................................................................................25
Power supply board ......................................................................................................................................................................................26
CPU board .......................................................................................................................................................................................................26
Input board .....................................................................................................................................................................................................26
MMI (keyboard, LED and display) ..............................................................................................................................................................26
4.2 SOFTWARE DESCRIPTION ..............................................................................................................................................................................27
Base software ................................................................................................................................................................................................27
Real-time operating system .........................................................................................................................................................................27
Task ..................................................................................................................................................................................................................27
Drivers ............................................................................................................................................................................................................ 28
Application Software ................................................................................................................................................................................... 28
Data Base ...................................................................................................................................................................................................... 28
Self test (Application) .................................................................................................................................................................................. 28
Development tools (Builder) ....................................................................................................................................................................... 28
4.3 I/O DESCRIPTION ............................................................................................................................................................................................. 29
Metering inputs ............................................................................................................................................................................................ 29
Signal processing ......................................................................................................................................................................................... 29
Conventions ................................................................................................................................................................................................... 33
Use of measured values ...............................................................................................................................................................................34
Binary inputs ..................................................................................................................................................................................................35
Output relays ................................................................................................................................................................................................. 40
LED indicators ................................................................................................................................................................................................42
Communication interfaces ...........................................................................................................................................................................44
4.4 PROTECTIVE ELEMENTS .................................................................................................................................................................................45
Rated values ...................................................................................................................................................................................................45
Thermal protection with RTD thermometric probes - 26 ....................................................................................................................... 48
Undervoltage - 27 ......................................................................................................................................................................................... 50
Undercurrent - 37 ..........................................................................................................................................................................................54
TD Discharge time .........................................................................................................................................................................................56
Phase unbalance current - 46 .....................................................................................................................................................................57
Neutral unbalance current - 46N ............................................................................................................................................................... 63
Thermal image - 49 ........................................................................................................................................................................................71
Phase overcurrent - 50/51 RMS ..................................................................................................................................................................82
Phase overcurrent - 50/51 Fundamental .................................................................................................................................................. 89
Residual overcurrent - 50N/51N .................................................................................................................................................................96
Overvoltage - 59 ...........................................................................................................................................................................................106
Breaker failure - BF .................................................................................................................................................................................... 110
4.5 CONTROL AND MONITORING ......................................................................................................................................................................112
Logical block - BLOCK1 ..............................................................................................................................................................................112
Selective block -BLOCK2 ...........................................................................................................................................................................114
Remote tripping .......................................................................................................................................................................................... 119
Frequency tracking .................................................................................................................................................................................... 120
Cold Load Pickup - CLP ..............................................................................................................................................................................121
CT supervision - 74CT .................................................................................................................................................................................122
Trip circuit supervision - 74TCS................................................................................................................................................................ 123
Circuit breaker supervision .......................................................................................................................................................................126
Demand measures ..................................................................................................................................................................................... 129
Oscillography ............................................................................................................................................................................................. 129
5 MEASURES, LOGIC STATES AND COUNTERS 130
Measures ..................................................................................................................................................................................................... 130
Protection .................................................................................................................................................................................................... 130
Delayed inputs ............................................................................................................................................................................................ 130
Internal states ............................................................................................................................................................................................. 130
Relays ............................................................................................................................................................................................................131
Counters ........................................................................................................................................................................................................131
Self test .........................................................................................................................................................................................................131
Pilot wire diagnostic ...................................................................................................................................................................................132
Selective Block - BLOCK2 ..........................................................................................................................................................................132
Fault recording - SFR ..................................................................................................................................................................................132
Event recording - SER ................................................................................................................................................................................ 133
Oscillography - DFR ................................................................................................................................................................................... 133
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