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-US
Figure 293: 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
.
Minimum recommended setting is 0.2% of S
N
when metering class CT inputs into the IED are
used.
3
N
S
UBase IBase
=
×
×
EQUATION1708 V1 EN-US
(Equation 517)
The setting
Angle1(2) gives the characteristic angle giving maximum sensitivity of the power
protection function. The setting is given in degrees. For active power the set angle should be
0° or 180°. 0° should be used for generator low forward active power protection.
1MRK 505 343-UEN B
Section 8
Current protection
453
Application manual
Содержание Relion 670 series
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