ABB RET670 - Setting Guidelines

Underpower IED
Overpower IED
Q Q
P P
Operating point
without
turbine torque
Margin Margin
Operate
Line
Operate
Line
Operating point
without
turbine torque
IEC06000315-2-en.vsd
IEC06000315 V2 EN
Figure 208: Reverse power protection with underpower IED and overpower IED
3.7.11.2 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.
3
N
N
S
IBase
V
=
×
EQUATION2037 V2 EN (Equation 383)
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
Set value
Mode Formula used for complex power calculation
A,B,C
* * *
A B C
A B C
S V I V I V I= × + × + ×
EQUATION2038 V1 EN (Equation 384)
Arone
* *
A C
AB BC
S V I V I= × ×-
EQUATION2039 V1 EN (Equation 385)
PosSeq
*
PosSeq
PosSeq
S 3 V I= × ×
EQUATION2040 V1 EN (Equation 386)
Table continues on next page
1MRK504116-UUS C Section 3
IED application
487
Application manual