ABB RELION 670 SERIES REG670 - Page 317

DirSuperv: The directional restrain characteristic allows impedance setting with
positive X value without the risk of unwanted operation of the under-excitation
function. T
o enable the directional restrain option the parameter DirSuperv shall be set
Enabled.
XoffsetDirLine, DirAngle: The settings XoffsetDirLine and DirAngle are shown in
figure
153. XoffsetDirLine is set in % of the base impedance according to
equation 164.
XoffsetDirLine is given a positive value if X > 0. DirAngle is set in degrees with
negative value in the 4
th
quadrant. Typical value is -13°.
R
X
Underexcitation Protection
Restrain area
DirAngle
- XoffsetDirLine
en06000461-2.vsd
IEC06000461 V2 EN-US
Figure 153: The settings XoffsetDirLine and DirAngle
1MRK 502 071-UUS A Section 8
Impedance protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 311
Application manual