201
A/D module (ADM)
Chapter 13
Hardware modules
2
A/D module (ADM)
2.1
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.
Summary of Contents for REL 501-C1 2.5
Page 1: ...Technical reference manual Line distance protection terminal REL 501 C1 2 5 ...
Page 2: ......
Page 26: ...14 Introduction to the technical reference manual Chapter 1 Introduction ...
Page 42: ...30 Technical data Chapter 2 General ...
Page 66: ...54 Blocking of signals during test BST Chapter 3 Common functions ...
Page 142: ...130 Time delayed overvoltage protection TOV Chapter 6 Voltage ...
Page 162: ...150 Autorecloser AR Chapter 9 Control ...
Page 174: ...162 Event function EV Chapter 10 Logic ...
Page 210: ...198 Serial communication Chapter 12 Data communication ...
Page 226: ...214 Serial communication modules SCM Chapter 13 Hardware modules ...
Page 230: ...218 Terminal diagrams Chapter 14 Diagrams Figure 87 REL 501 C1 with DC switch ...
Page 234: ...222 Terminal diagrams Chapter 14 Diagrams ...
Page 237: ......