ABB RELION 670 SERIES Applications Manual page 558

Section 9
Current protection
552
Operate
IEC06000441 V1 EN
Figure 283: 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 494.
Minimum recommended setting is 0.2% of S
are used.
= × ×
S 3 VBase IBase
N
EQUATION2047 V1 EN
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.
Q
Power1(2)
Angle1(2)
when metering class CT inputs into the IED
N
1MRK 506 369-UUS -
P
en06000441.vsd
(Equation 494)
Line distance protection REL670 2.2 ANSI
Application manual