ABB REG316 4 Series Operating Instructions Manual page 199

REG 316*4 1MRB520049-Uen / Rev. F
Phase correction
The scheme can include one to three independent measuring
systems, each of which is connected to a phase-to-phase volt-
age and a phase current. For example, there are three possible
reference voltages for the R phase measuring system, i.e. U
U and U . Since, however, all the measuring systems need
ST TR
the angle of their own phase, i.e. for R phase the angle of the
voltage U , the angle of the voltage signal has to be corrected in
R
any event.
Reference voltage
RS
*)
ST
*)
TR
*) single-phase measurement only
The phase compensation can also be used when the character-
istic needs to be shifted by a given angle or flipped over into the
inductive region, e.g. for test purposes.
If the star-point of the c.t. secondaries on the generator star-
point side is grounded, an angle of -180° must be added.
Vector diagram
R U RS
T S
R
T S
U
ST
U
TR R
T
S
ABB Switzerland Ltd
RS
Phase compensation
"Angle"
+30°
-90°
+150°
HEST 905023 C
3-161
,