Setting Guidelines - ABB RET670 Applications Manual

1MRK504116-UUS C
3.7.11.2
Application manual
Underpower IED
Q
Operate
Line
Margin
P
Operating point
without
turbine torque
IEC06000315 V2 EN
Figure 208: Reverse power protection with underpower IED and overpower IED

Setting guidelines

Operation: With the parameter Operation the function can be set Enabled/Disabled.
IBase: The parameter IBase is set to the generator rated current in A, see equation 383.
S
=
N
IBase
×
3 V
N
EQUATION2037 V2 EN
VBase: The parameter VBase is set to the generator rated voltage (phase-phase) in kV.
Mode: The voltage and current used for the power measurement. The setting
possibilities are shown in table 113.
Table 113: Complex power calculation
Mode
Set value
A,B,C
Arone
PosSeq
Table continues on next page
Overpower IED
Q
Operate
Line
Margin
Operating point
without
turbine torque
IEC06000315-2-en.vsd
Formula used for complex power calculation
=
S V
A
EQUATION2038 V1 EN
=
S V
AB
EQUATION2039 V1 EN
= ×
S 3 V
EQUATION2040 V1 EN
IED application
P
* *
× + × + ×
I V I V I
A B B C
* *
-
× ×
I V I
A C
BC
*
×
I
PosSeq PosSeq
Section 3
(Equation 383)
*
C
(Equation 384)
(Equation 385)
(Equation 386)
487