ABB RELION RET670 Applications Manual page 589

1MRK 504 163-UUS A
Transformer protection RET670 2.2 ANSI
Application manual
Operate
IEC06000441 V1 EN-US
Figure 285: 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 462.
Minimum recommended setting is 0.2% of S
IED are used.
= × ×
S 3 VBase IBase
N
EQUATION2047 V1 EN-US
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.
Q
Power1(2)
Angle1(2)
when metering class CT inputs into the
N
Section 9
Current protection
P
en06000441.vsd
(Equation 462)
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