ABB Relion 650 Series Applications Manual page 50

Section 4
Analog inputs
In the example in
example
current inputs on the TRM (item 2 in the figure):
CTprim =600A
•
CTsec =5A
•
CTWyePoint =FromObject
•
Inside the IED only the ratio of the first two parameters is used. The third parameter as set in this
example will negate the measured currents in order to ensure that the currents are measured
towards the protected object within the IED.
4.2.4 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
phase value can be used even if each channel is connected to a phase-to-ground voltage from the
VT.
4.2.4.1 Example
Consider a VT with the following data:
132kV
3
EQUATION1937 V1 EN-US
The following setting should be used:
4.2.4.2 Examples how to connect, configure and set VT inputs for most commonly
used VT connections
Figure 14
+
V
Pri
ANSI11000175 V1 EN-US
Figure 14: Commonly used markings of VT terminals
44
figure 13 case everything is done in a similar way as in the above described
(figure 12). The only difference is the setting of the parameter
120V
3
defines the marking of voltage transformer terminals commonly used around the world.
+
A
(H1)
V
Sec
N
(H2)
a) b)
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VTsec and VTprim for each voltage channel. The phase-to-
VTprim=132 (value in kV) VTsec=120 (value in V)
a A da
(X1) (X1)
(H1)
dn
n N
(X2) (H2) (X2)
c)
1MRK 505 287-UUS B
CTStarPoint of the used
(Equation 2)
SEMOD55055-60 v4
a
A
(X1)
(H1)
B b
(H2) (X2)
d)
ANSI11000175_1_en.vsd
Busbar protection REB650
Application manual
SEMOD55055-44 v3
SEMOD55055-47 v2