Setting Of Voltage Channels; Example; Examples How To Connect, Configure And Set Vt Inputs For Most Commonly Used Vt Connections - ABB REB670 Applications Manual

Section 4
Analog inputs
4.2.3
4.2.3.1
4.2.3.2
78
Where:
1) shows how to connect single-phase CT input in the IED.
2) is TRM where these current inputs are located. It shall be noted that for all these current inputs
the following setting values shall be entered.
For connection (a) shown in figure 26:
CT prim = 1000 A
CT sec = 1A
CTWyePoint = ToObject
For connection (b) shown in figure 26:
CT prim = 1000 A
CT sec = 1A
CTWyePoint = FromObject
3) shows the connection made in SMT tool, which connect this CT input to the fourth input channel
of the preprocessing function block 4).
4) is a Preprocessing block that has the task to digitally filter the connected analog inputs and
calculate values. The calculated values are then available for all built-in protection and control
functions within the IED, which are connected to this preprocessing function block.
If frequency tracking and compensation is required (this feature is typically required only for
IEDs installed in the power plants) then the setting parameters
accordingly.

Setting of voltage channels

As the IED uses primary system quantities the main VT ratios must be known to the IED.
This is done by setting the two parameters VTsec and VTprim for each voltage channel.
The phase-to-phase value can be used even if each channel is connected to a phase-to-
ground voltage from the VT.

Example

Consider a VT with the following data:
132kV 120V
3 3
EQUATION1937 V1 EN
The following setting should be used: VTprim=132 (value in kV) VTsec=120 (value in V)
Examples how to connect, configure and set VT inputs for most commonly
used VT connections
Figure 27 defines the marking of voltage transformer terminals commonly used around
the world.
1MRK 505 337-UUS -
DFTReference shall be set
(Equation 1)
Application manual