ABB RET670 - Setting Parameters

Where:
1) shows how to connect the secondary side of neutral point VT to one VT input in the IED.
V
0
shall be connected to the IED.
2) is the TRM or AIM where this voltage input is located. For this voltage input the following
setting values shall be entered:
6.6
3.81
3
VTprim kV= =
EQUATION1933 V1 EN (Equation 27)
sec 100VT V=
EQUATION1934 V1 EN (Equation 28)
Inside the IED, only the ratio of these two parameters is used. It shall be noted that the ratio of
the entered values exactly corresponds to ratio of the neutral point VT.
3) shows that in this example the first three input channel of the preprocessing block is not
connected in SMT tool or ACT tool.
4) shows the connection made in Signal Matrix Tool (SMT), Application configuration tool (ACT),
which connects this voltage input to the fourth input channel of the preprocessing function block
5).
5) is a preprocessing block that has the task to digitally filter the connected analog inputs and
calculate:
• fundamental frequency phasors for all four input channels
• harmonic content for all four input channels
• positive, negative and zero sequence quantities by using the fundamental frequency
phasors for the first three 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.
If frequency tracking and compensation is required (this feature is typically required only for
IEDs installed in the generating stations) then the setting parameters
DFTReference shall be
set accordingly.
3.2.3 Setting parameters
The available setting parameters related to analog inputs are depending
on the actual hardware (TRM) and the logic configuration made in
PCM600.
Section 3 1MRK504116-UUS C
IED application
62
Application manual