ABB RELION 650 Series Applications Manual page 178

Section 8
Current protection
The function has two stages that can be set independently.
With the parameter
The function gives trip if the power component in the direction defined by the setting
Angle1(2) is smaller than the set pick up power value Power1(2)
IEC06000441 V1 EN-US
Figure 98: Underpower mode
The setting
setting is given in p.u. of the generator rated power, see equation 128.
Minimum recommended setting is 0.2% of S
used.
=
S
N
EQUATION1708 V1 EN-US
The setting
protection function. The setting is given in degrees. For active power the set angle should be
0° or 180°. 0° should be used for generator low forward active power protection.
172
OpMode1(2) the function can be set On / Off .
Q
Power1(2)
Operate
Power1(2) gives the power component pick up value in the Angle1(2) direction. The
× ×
3 UBase IBase
Angle1(2) gives the characteristic angle giving maximum sensitivity of the power
Angle1(2)
en06000441.vsd
when metering class CT inputs into the IED are
N
1MRK 505 363-UEN A
P
(Equation 128)
Application manual