Hitachi Relion 670 Series Applications Manual page 73

1MRK511407-UUS Rev. N
Where:
1)
2)
3)
4)
5)
Phasor measurement unit RES670
Application manual
shows how to connect the secondary side of neutral point VT to one VT input in the IED.
V shall be connected to the IED.
0
is the TRM or AIM where this voltage input is located. For this voltage input the following setting values shall be
entered:
6.6
= =
VTprim 3.81 kV
3
EQUATION1933 V1 EN-US

VT sec 100 V
EQUATION1934 V2 EN-US
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.
shows that in this example the first three input channel of the preprocessing block is not connected in SMT tool
or ACT tool.
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).
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.
© 2017 - 2023 Hitachi Energy. All rights reserved
Section 4
Analog inputs
(Equation 12)
(Equation 13)
67