ABB RET670 Applications Manual

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

ABB RET670 Specifications

General

Rated Frequency	50/60 Hz
Inputs	Analog and binary inputs
Application	Protection of power systems
Communication Protocols	IEC 61850, DNP3, Modbus
Operating Temperature Range	-25°C to +55°C
Mounting	Rack mounted
Number of Binary Inputs	Up to 48
Number of Binary Outputs	32
Protection Functions	Overcurrent Protection
Outputs	Binary outputs
Enclosure	IP 54
Type	Line Differential Protection
Number of Analog Inputs	24