NA10 - Manual - 04 - 2022
3.9 METERING..........................................................................................................................................................................................................25
Accuracy (type tests)....................................................................................................................................................................................25
Measures ........................................................................................................................................................................................................25
4 FUNCTION CHARACTERISTICS 26
4.1 HARDWARE DESCRIPTION .............................................................................................................................................................................26
Power supply board ......................................................................................................................................................................................27
CPU board ....................................................................................................................................................................................................... 27
Input board .....................................................................................................................................................................................................27
MMI (keyboard, LED and display) ..............................................................................................................................................................27
4.2 SOFTWARE DESCRIPTION ............................................................................................................................................................................. 28
Base software ............................................................................................................................................................................................... 28
Real-time operating system ........................................................................................................................................................................ 28
Task ................................................................................................................................................................................................................. 28
Drivers ............................................................................................................................................................................................................ 29
Application Software ................................................................................................................................................................................... 29
Data Base ...................................................................................................................................................................................................... 29
Self test (Application) .................................................................................................................................................................................. 29
Development tools (Builder) ....................................................................................................................................................................... 29
4.3 I/O DESCRIPTION ............................................................................................................................................................................................. 30
Metering inputs ............................................................................................................................................................................................ 30
Signal processing ......................................................................................................................................................................................... 30
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 ........................................................................................................................47
Thermal image - 49 ....................................................................................................................................................................................... 49
Phase overcurrent - 50/51 ........................................................................................................................................................................... 60
Residual overcurrent - 50N/51N ................................................................................................................................................................ 70
Residual overvoltage - 59N ......................................................................................................................................................................... 80
Ground directional overcurrent - 67N ........................................................................................................................................................84
Breaker failure - BF ..................................................................................................................................................................................... 107
4.5 CONTROL AND MONITORING ..................................................................................................................................................................... 109
Logical block - BLOCK1 ............................................................................................................................................................................. 109
Selective block - BLOCK2 ..........................................................................................................................................................................111
Internal selective block -BLOCK4 .............................................................................................................................................................116
Remote tripping ...........................................................................................................................................................................................117
Frequency tracking .................................................................................................................................................................................... 118
Second Harmonic Restraint - 2ndh-REST .............................................................................................................................................. 119
Cold Load Pickup - CLP ............................................................................................................................................................................. 120
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
6 INSTALLATION 135
6.1 PACKAGING .....................................................................................................................................................................................................135
6.2 MOUNTING ......................................................................................................................................................................................................135
6.3 ELECTRICAL CONNECTIONS ....................................................................................................................................................................... 139
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