Thytronic NC020 - Control and Monitoring; Circuit Breaker Monitoring; Oscillography (DFR); Measures

TECHNICAL DATA
19
NC020 - Manual - 05 - 2022
3.8 CONTROL AND MONITORING
— Circuit Breaker monitoring
Circuit breaker diagnostic
Diagnostic (CB check) 52a, 52b, 52a/52b
— Oscillography (DFR)
Format COMTRADE
Number of records
2
Recording mode
circular
Sampling rate
24 samples / power cycle
Set trigger:
• Pre-trigger time
0...63 T
[1] [2]
• Trigger inputs IN1, IN2, IN3
• Trigger outputs K1...K4
• Manual Trigger ThyVisor
• General Trigger from start / trips Start, Trip
• Trigger from start / trips Start I>, I>>, ...Trip I>...
Set analog channels:
Analog 1...Analog 4
• Instantaneous currents value i
L1
, i
L2
, i
L3
, i
N
Set digital channels:
• Inputs IN1, IN2, IN3
• Outputs K1...K4
• General from start / trips Start, Trip
3.9 MEASURES
RMS value of the fundamental component for phase currents (I
L1
, I
L2
, I
L3
)
RMS value for phase currents
[2]
I
L1 RMS
, I
L2 RMS
, I
L3 RMS
RMS value of the fundamental component for neutral current (I
N
)
RMS value of the fundamental component for residual current
[3]
(I
EC
)
Fundamental RMS of compensated neutral current
[4]
I
NC
Displacement angle of neutral current I
N
with respect to I
L1
I
N PHI
Capacitor peak voltages V
1
, V
2
, V
3
Discharge timer T
D
Displacement angle of calibrated neutral current
[5]
I
N PHI calib
Fundamental RMS of calibrated neutral current
[6]
I
NC MOD calib
Note 1 - T = number of power cycles
Example, with setting T=4 the pre-trigger is 80 ms with f = 50 Hz
Note 2 RMS value measurement of three phase currents (the computed RMS value takes into account the contribution of fundamental and harmonic
up to twenty-third order)
Note 3 Computed residual current I
EC
(vectorial sum of the phase currents) is employed
Note 4 I
NC
= |I
N
 I
N PHI
- I
NC MOD calib
 I
N PHI calib
|
Note 5 I
N PHI calib
is a compensation value for neutral current displacement determined by the device as a result of the INC Comp exe command
available inside the Commands\Compensation\Set compensation menu
Note 6 I
N MOD calib
is a compensation value for neutral current determined by the device as a result of the INC Comp exe command
available inside the Commands\Compensation\Set compensation menu