ABB Relion 670 Series Applications Manual page 188

Section 7
Current protection
IEC06000441 V1 EN-US
Figure 84: Underpower mode
The setting
setting is given in p.u. of the generator rated power, see equation 74.
Minimum recommended setting is 0.2% of S
=
S
N
EQUATION2047 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.
182
Q
Power1(2)
Operate
Power1(2) gives the power component pick up value in the Angle1(2) direction. The
× ×
3 VBase 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 used.
N
1MRK 511 358-UUS A
P
Application manual
(Equation 74)