ABB RES670 Applications Manual page 176

Section 8
Current protection
170
Operate
IEC06000557 V2 EN-US
Figure 70: 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 79.
= × ×
S 3 UBase IBase
N
EQUATION1708 V1 EN-US
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:
( )
= × + - ×
S k S 1 k S
Old Calculated
EQUATION1893 V1 EN-US
Where
S is a new measured value to be used for the protection function
S is the measured value given from the function in previous execution cycle
old
S is the new calculated value in the present execution cycle
Calculated
k is settable parameter
Q
Angle1(2 ) = 180
Power 1(2)
IEC06000557-2-en.vsd
Phasor measurement unit RES670 2.2 IEC
1MRK 511 407-UEN C
o
P
(Equation 79)
(Equation 80)
Application manual