ABB Relion 670 Series Applications Manual page 208

Section 8
Current protection
Operate
IEC06000557 V2 EN-US
Figure 95: 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 92.
=
S 3 VBase IBase
N
EQUATION2047 V1 EN-US
The drop out power will be
The possibility to have low pass filtering of the measured power can be made as shown in the
formula:
S TD S
=
EQUATION1893-ANSI V1 EN-US
Where
S
S
old
S
Calculated
TD
202
Power 1(2)
× ×
Power1(2) - Hysteresis1(2) .
( )
TD S
1
⋅ + − ⋅
Old Calculated
is a new measured value to be used for the protection function
is the measured value given from the function in previous execution cycle
is the new calculated value in the present execution cycle
is settable parameter
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Q
o
Angle1(2 ) = 180
IEC06000557-2-en.vsd
1MRK 511 401-UUS F
P
(Equation 92)
(Equation 93)
Bay control REC670
Application manual