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2
2.1
A/D module (ADM)
A/D module (ADM)
Design
The inputs of the A/D-conversion module (ADM) are fed with voltage and current signals from
the transformer module. The current signals are adapted to the electronic voltage level with
shunts. To gain dynamic range for the current inputs, two shunts with separate A/D channels are
used for each input current. By that a 16-bit dynamic range is obtained with a 12 bits A/D con-
verter.
The input signals passes an anti aliasing filter with a cut-off frequency of 500 Hz.
Each input signal (5 voltages and 5 currents) is sampled with a sampling frequency of 2 kHz.
The A/D-converted signals are low-pass filtered with a cut-off frequency of 250 Hz and
down-sampled to 1 kHz in a digital signal processor (DSP) before transmitted to the main pro-
cessing module.
Chapter 13
Hardware modules
201
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