ABB RET670 - Setting Guidelines

Underpower protection
Overpower protection
Q Q
P P
Operating point
without
turbine torque
Margin Margin
Operate
Line
Operate
Line
Operating point
without
turbine torque
IEC09000019-2-en.vsd
IEC09000019 V2 EN
Figure 205: Reverse power protection with underpower or overpower protection
3.7.10.2 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 370.
3
N
N
S
IBase
V
=
×
EQUATION2037 V2 EN (Equation 370)
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
109.
Table 109: Complex power calculation
Set value
Mode Formula used for complex power calculation
A, B, C
* * *
A A B B C C
S V I V I V I= × + × + ×
EQUATION2055-ANSI V1 EN (Equation 371)
Arone
* *
AB A BC C
S V I V I= × - ×
EQUATION2056-ANSI V1 EN (Equation 372)
PosSeq
*
3
PosSeq PosSeq
S V I= × ×
EQUATION2057-ANSI V1 EN (Equation 373)
Table continues on next page
1MRK504116-UUS C Section 3
IED application
479
Application manual