MEASURES, LOGIC STATES AND COUNTERS
51
NC020 - Manual - 05 - 2022
5 MEASURES, LOGIC STATES AND COUNTERS
— Measures
• RMS value of fundamental component of phase currents (I
L1
, I
L2
, I
L3
)
• RMS value for phase currents (I
L1 RMS
, I
L2 RMS
, I
L3 RMS
)
• RMS value neutral current (I
N
)
• Displacement angle of neutral current (I
N PHI
)
• Displacement angle of calibrated neutral current (I
N PHI calib
)
• Fundamental component of calibrated neutral current (I
N MOD calib
)
• Capacitor calculated peak voltages (V
1
, V
2
, V
3
)
• RMS value of fundamental component of calculated residual current (I
EC
)
• Discharge timer T
D
— Circuit breaker
The CB and Trip Circuit Supervision states are provided
• Position Open - Closed - Unknown
and the binary inputs state:
• IN1-52b On/O
• IN2-52a On/O
— Counters
For every protective element and control function several counters are available; the partial coun-
ters can be cleared by the user.
Every partial counter is reset to zero when ten thousand count is passed.
All partial counters can be cleared by means a single command; for this purpose the Reset coun-
ters command must be issued available inside the Reset menu.
• Start I> element On/O
• Start I>> element On/O
• Start I>>> element On/O
• Start IE> element On/O
• Start IE>> element On/O
• Start IN>AL element On/O
• Start IN> element On/O
• Start IN>> element On/O
• Start U> element On/O
• Start U>> element On/O
• Start U>>> element On/O
• Start I<< element On/O
• Trip > element On/O
• Trip I>> element On/O
• Trip I>>> element On/O
• Trip IE> element On/O
• Trip IE>> element On/O
• Trip IN>AL element On/O
• Trip IN> element On/O
• Trip IN>> element On/O
• Trip U> element On/O
• Trip U>> element On/O
• Trip U>>> element On/O
• Trip I<< element On/O
— Fault recording - SFR
Recording
[1]
is triggered by:
• Relay activation (OFF-ON)
• Element start or trip
Twenty faults are recorded into a circular FIFO (First In, First Out) buffer.
[2]
Following information are stored in every record (Read \ Faults \ Info menu):
• Fault counter (Faults stored)
[3]
F-number
• Fault cause F-cause
• Date and time (S-Millisecond
• Phase currents (fundamental) F-IL1 RMS, F-IL2 RMS, F-IL3 RMS
• Phase currents (RMS) F-IL1, F-IL2, F-IL3
• Calculated residual current F-IEC
• Compensated neutral current F-INC
• Voltages F-V1, F-V2, F-V3
• Date and time F-Year
• Date and time F-Month
• ...
The fault log may be erased by means of the command inside the Read \ Faults \ Reset menu.
Note 1 Data concerning the twenty events are stored into non volatile memory; they are held in spite of power down
Note 2 Fault 0 is the newest event, while the Fault 19 is the oldest event
Note 3 Counter is updated at any new record; it may be cleared by means ThyVisor
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