Set value
Mode
Formula used for complex power calculation
L1
EQUATION1703 V1 EN (Equation 62)
L2
EQUATION1704 V1 EN (Equation 63)
L3
EQUATION1705 V1 EN (Equation 64)
The function has two stages that can be set independently.
With the parameter OpMode1(2) the function can be set On/Off.
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)
Operate
Angle1(2)
Power1(2)
P
Q
en06000441.vsd
IEC06000441 V1 EN
Figure 72: Underpower mode
The setting Power1(2) gives the power component pick up value in the Angle1(2)
direction. The setting is given in p.u. of the generator rated power, see equation 65.
Minimum recommended setting is 1.0% of S
N
. At the same time the minimum IED
pickup current shall be at least 9 mA secondary.
Section 6 1MRK 505 291-UEN A
Current protection
150
Application manual
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