ABB RED650 Applications Manual page 69

1MRK 505 393-UEN B
Line differential protection RED650 2.2 IEC
Application manual
Where:
1) shows how to connect the secondary side of the open delta VT to one VT input on the
IED.
2) is the TRM where this voltage input is located. It shall be noted that for this voltage input
the following setting values shall be entered:
= ×
VTprim 3 6.6
EQUATION1923 V1 EN-US
110
= ×
VT sec 3
3
EQUATION1924 V1 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 one individual open delta VT.
6.6
×
3 6.6
=
110
110
EQUATION1925 V1 EN-US
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 connect 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 input
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
shall be set accordingly.
+3U0 shall be connected to the IED
=
11.43 kV
=
110 V
3
3
Section 4
Analog inputs
(Equation 4)
(Equation 5)
(Equation 6)
DFTReference
63