Thytronic NG10 User Manual

FUNCTION CHARACTERISTICS
81
NG10 - Manual - 04 - 2022
Frequency tracking
Within the frequency range 45...55 Hz (f
n
= 50 Hz) or 54...63 Hz (f
n
= 60 Hz), a frequency tracking al-
gorithm adjusts the currents sampling frequency, so as to keep the number of samples in any given
period constant.
With 16 samples for periods the sampling rate is adjusted from 720 H with f = 45 Hz to 1.008 kHz with
f= 63 Hz
For a frequency step change the tracking response time is 10 Hz/s.
The frequency measure is based on the largest phase current on side H.
• If the larger phase input current is lower than 25% I
nH
the sampling frequency is fixed to f
n
(50 or 60 Hz).
• If the measured frequency is outside the locking range
,
the sampling frequency is fixed to the lower
or upper value (45 or 55 Hz with f
n
= 50 Hz, 54 or 63 Hz with f
n
= 63 Hz).
All protective elements are always operative; accuracy is guaranteed inside the locked frequency
band.
IF.ai
Frequency tracking
0.25 I
nH
0.25 I
n
40 45 6055
f (Hz)
50 Hz (0 Hz)
Max I
L1H...L3H
40 Hz
45 Hz
60 Hz
55 Hz
40 54 7063
f (Hz)
60 Hz (0 Hz)
Max I
L1H...L3H
40 Hz
54 Hz
70 Hz
63Hz
I
L1H
I
L2H
I
L3H
sampling frequency
Max I
L1H...L3H
> 0.25 I
n
Displayed value
Locked frequency
Locked frequency (Displayed value)
Displayed value
Locked frequency
Locked frequency (Displayed value)
Nominal frequency
f
n
= 50 Hz
Nominal frequency
f
n
= 60 Hz

Thytronic NG10 Specifications

General

Brand	Thytronic
Model	NG10
Category	Protection Device
Language	English