Setting Of Voltage Channels - ABB REL650 Applications Manual

Section 4
Analog inputs
4.2.4
4.2.4.1
4.2.4.2
100

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 42 defines the marking of voltage transformer terminals commonly used around
the world.
+ +
V V
Pri Sec
a)
ANSI11000175 V1 EN
Figure 42: 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-ground
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
a
A
A
(X1)
(H1)
(H1)
N n N
(H2) (X2) (H2)
b)
1MRK 506 334-UUS A
da
A
(X1)
(H1)
dn
B
(X2) (H2)
c) d)
ANSI11000175_1_en.vsd
Application manual
(Equation 33)
a
(X1)
b
(X2)