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DMC3S - Manual - 08 - 2021
3.8 CONTROL FUNCTIONS 26
Synchrocheck relay - 25 ...............................................................................................................................................................................26
VT monitoring - 74TV ..................................................................................................................................................................................... 26
CT Monitoring - 74CT ....................................................................................................................................................................................26
Breaker failure - BF ....................................................................................................................................................................................... 26
Breaker coils control monitoring ................................................................................................................................................................26
Opening command breaker diagnostics....................................................................................................................................................26
Closing command breaker diagnostics .....................................................................................................................................................26
Automatic reclosing - 79 ..............................................................................................................................................................................27
3.9 MEASUREMENTS 27
Precision (type tests) ....................................................................................................................................................................................27
Measurements ............................................................................................................................................................................................... 27
4 FUNCTIONAL CHARACTERISTICS 30
4.1 CONFIGURABILITY 30
4.2 ADDITIONAL EXTERNAL MODULES 31
4.3 DESCRIPTION OF OPERATION 32
Measurement conventions .......................................................................................................................................................................... 32
Logical inputs .................................................................................................................................................................................................33
Output relays ..................................................................................................................................................................................................34
Reset timers ....................................................................................................................................................................................................37
Shrink time ...................................................................................................................................................................................................... 37
Back-up Time .................................................................................................................................................................................................38
Direct undervoltage - 27CC .......................................................................................................................................................................... 39
Maximum directional active power - 32P ..................................................................................................................................................40
Negative sequence overcurrent - 46 .........................................................................................................................................................42
Overcurrent - 50/51 ........................................................................................................................................................................................44
Residual overcurrent - 50N/51N ..................................................................................................................................................................46
Neutral overcurrent - 51(E) ..........................................................................................................................................................................48
Residual emergency overcurrent - 51(Eme) .............................................................................................................................................50
Neutral current unbalance - 51(SQL) .........................................................................................................................................................52
Overvoltage - 59 ............................................................................................................................................................................................. 54
Residual overvoltage - 59N .......................................................................................................................................................................... 56
Residual emergency overvoltage - 59N(Eme) ..........................................................................................................................................58
Maximum directional current - 67 ..............................................................................................................................................................60
Ground directional overcurrent - 67N ........................................................................................................................................................ 65
Ground directional overcurrent - 67N (Intermittent faults) ....................................................................................................................69
Ground directional overcurrent - 67N (Evolving faults) ..........................................................................................................................70
Logical block - Block1 ...................................................................................................................................................................................74
EAC (Equilibratore Automatico di Carico) [ALB frequency (Automatic Load Balancer)] protection ..............................................75
Second harmonic restraint - 2ndh-REST ................................................................................................................................................... 77
Breaker monitoring .......................................................................................................................................................................................78
Average measures ........................................................................................................................................................................................81
Oscillographyy ...............................................................................................................................................................................................81
CT Monitoring - 74CT ....................................................................................................................................................................................82
VT monitoring - 74VT ..................................................................................................................................................................................... 83
Breaker coils control monitoring ...............................................................................................................................................................85
Synchrocheck relay (Synchro check) - 25 ................................................................................................................................................86
Auto-reclose (79) ...........................................................................................................................................................................................91
Breaker failure - BF ....................................................................................................................................................................................... 94
5 AUTOMATION FUNCTIONS 95
Logical selectivity block - FSL .....................................................................................................................................................................95
6 CYBER SECURITY 96
Configuration management .........................................................................................................................................................................96
Hardware systems and networking equipment .......................................................................................................................................96
Initial system configuration .........................................................................................................................................................................96
Threat and vulnerability management .......................................................................................................................................................96
Access control ............................................................................................................................................................................................... 96
Authentication and authorization management ...................................................................................................................................... 96
Auditing ...........................................................................................................................................................................................................96
Network communication security .............................................................................................................................................................97
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