ABB REQ650 User Manual

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 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-earth voltage from the VT.
4.2.4.1 Example
Consider a VT with the following data:
132 110
3 3
kV V
EQUATION2016 V1 EN (Equation 1)
The following setting should be used: VTprim=132 (value in kV) VTsec=110 (value
in V)
4.2.4.2 Examples how to connect, configure and set VT inputs for most
commonly used VT connections
Figure
29 defines the marking of voltage transformer terminals commonly used
around the world.
A
(H1)
B
(H2)
b
(X2)
a
(X1)
A
(H1)
N
(H2)
n
(X2)
a
(X1)
b) c)
A
(H1)
N
(H2)
dn
(X2)
da
(X1)
d)
U
Pri
+
+
U
Sec
a)
en06000591.vsd
IEC06000591 V1 EN
Figure 29: Commonly used markings of VT terminals
Where:
a) is the symbol and terminal marking used in this document. Terminals marked with a dot
indicate the primary and secondary winding terminals with the same (positive) polarity
b) is the equivalent symbol and terminal marking used by IEC (ANSI) standard for phase-to-
earth connected VTs
c) is the equivalent symbol and terminal marking used by IEC (ANSI) standard for open delta
connected VTs
d) is the equivalent symbol and terminal marking used by IEC (ANSI) standard for phase-to-
phase connected VTs
1MRK 505 291-UEN A Section 4
Analog inputs
71
Application manual

ABB REQ650 Specifications

General

Brand	ABB
Model	REQ650
Category	Protection Device
Language	English