ABB Relion REG670, Applications Manual

Page: 386 / 780

3
N
S UBase IBase
= × ×
EQUATION1708 V1 EN
(Equation 222)
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.
Operate
Angle1(2) = 0
°
Power1(2)
P
Q
en06000556.vsd
IEC06000556 V1 EN
Figure 197: For low forward power the set angle should be 0° in the underpower
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 223 .
3
N
S UBase IBase
= × ×
EQUATION1708 V1 EN
(Equation 223)
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 502 071-UEN -
Current protection
380 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual