ABB Relion 670 Series Applications Manual page 210

Section 7
Current protection
IEC06000441 V1 EN-US
Figure 110: Underpower mode
The setting Power1(2) gives the power component pick up value in the Angle1(2) direction. The setting is
given in p.u. of the generator rated power, see equation 56.
Minimum recommended setting is 0.2% of S
=
S
N
EQUATION2047 V1 EN-US
The setting Angle1(2) gives the characteristic angle giving maximum sensitivity of the power 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.
204
Q
Power1(2)
Operate
× ×
3 VBase IBase
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Angle1(2)
en06000441.vsd
when metering class CT inputs into the IED are used.
N
1MRK 505 370-UUS Rev. K
P
Busbar protection REB670
Application manual
(Equation 56)