Example How To Connect Single-Phase Ct To The Ied - ABB RER670 Applications Manual

1MRK 506 375-UEN A
4.2.2.6
Railway application RER670 2.2 IEC
Application manual
4) Are two connections made in the Signal Matrix tool (SMT) and Application configuration
tool (ACT) which connects these two phase current inputs to the first two input channels
on the preprocessing function block 6).
5) Is a connection made in the Signal Matrix tool (SMT) and Application configuration tool
(ACT), which connects the residual/neutral current input to the fourth input channel of the
preprocessing function block 6). Note that this connection in SMT shall not be done if the
residual/neutral current is not connected to the IED.
6) Is a Preprocessing block that has the task to digitally filter the connected analog inputs and
calculate:
• fundamental frequency phasors for all input channels
• harmonic content for all input channels
• positive and zero sequence quantities by using the fundamental frequency phasors
of the first two input channels (channel one taken as reference for sequence
quantities)
These calculated values are then available for all built-in protection and control functions
within the IED, which are connected to this preprocessing function block in the
configuration tool. For this application, most of the preprocessing settings can be left to the
default values.

Example how to connect single-phase CT to the IED

Figure 15 gives an example how to connect the single-phase CT to the IED. It
gives an overview of the required actions by the user in order to make this
measurement available to the built-in protection and control functions within the
IED as well.
For correct terminal designations, see the connection diagrams
valid for the delivered IED.
Section 4
Analog inputs
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