ABB RELION RET670 - Page 596

Operate
Angle1(2 ) = 180
o
Power1(2)
P
Q
IEC06000557-2-en.vsd
IEC06000557 V2 EN-US
Figure 289: For reverse power the set angle should be 180° in the overpower
function
TripDelay1(2) is set in seconds to give the time delay for trip of the stage after pick up.
Hysteresis1(2) is given in p.u. of generator rated power according to equation
476.
N
S 3 VBase IBase= × ×
EQUATION2047 V1 EN-US (Equation 476)
The drop out power will be Power1(2) - Hysteresis1(2).
The possibility to have low pass filtering of the measured power can be made as shown
in the formula:
Section 9 1MRK 504 163-UUS A
Current protection
590 Transformer protection RET670 2.2 ANSI
Application manual