ABB REG670 - Page 392

Operate
Angle1(2 ) = 180
o
Power1(2)
P
Q
IEC06000557-2-en.vsd
IEC06000557 V2 EN
Figure 200: 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 236.
3
N
S UBase IBase= × ×
EQUATION1708 V1 EN
(Equation 236)
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:
( )
1
Old Calculated
S k S k S= × + - ×
EQUATION1893 V1 EN (Equation 237)
Where
S is a new measured value to be used for the protection function
S
old
is the measured value given from the function in previous execution cycle
S
Calculated
is the new calculated value in the present execution cycle
k is settable parameter
Section 9 1MRK 502 071-UEN -
Current protection
386 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual