ABB REG670 - Page 385

Set value Mode Formula used for complex power calculation
L1
*
1 1
3
L L
S U I= × ×
EQUATION1703 V1 EN (Equation 219)
L2
*
2 2
3
L L
S U I= × ×
EQUATION1704 V1 EN (Equation 220)
L3
*
3 3
3
L L
S U I= × ×
EQUATION1705 V1 EN (Equation 221)
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 196: 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 222.
Minimum recommended setting is 0.2% of S
N
when metering class CT inputs into the
IED are used.
1MRK 502 071-UEN - Section 9
Current protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 379
Application manual