ABB Relion 670 Series Applications Manual page 196

Section 8
Current protection
Set value
L1
L2
L3
The function has two stages that can be set independently.
With the parameter
The function gives trip if the power component in the direction defined by the setting
Angle1(2) is smaller than the set pick up power value Power1(2)
IEC06000441 V1 EN-US
Figure 92: Underpower mode
The setting
setting is given in p.u. of the generator rated power, see equation 78.
Minimum recommended setting is 0.2% of S
used.
=
S
N
EQUATION1708 V1 EN-US
190
Mode
OpMode1(2) the function can be set On / Off .
Q
Power1(2)
Operate
Power1(2) gives the power component pick up value in the Angle1(2) direction. The
× ×
3 UBase IBase
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Formula used for complex power calculation
*
= × ×
S 3 U I
L 1 L 1
EQUATION1703 V1 EN-US
*
= × ×
S 3 U I
L 2 L 2
EQUATION1704 V1 EN-US
*
= × ×
S 3 U I
L 3 L 3
EQUATION1705 V1 EN-US
Angle1(2)
en06000441.vsd
when metering class CT inputs into the IED are
N
1MRK 511 401-UEN Rev. K
(Equation 75)
(Equation 76)
(Equation 77)
P
(Equation 78)
Bay control REC670
Application manual