ABB REL670 2.2 IEC - Setting Guidelines

• Overcurrent or overvoltage protection at specific frequency harmonic, sub-
harmonic, inter-harmonic etc.
• Presence of special railway frequencies (e.g. 16.7Hz or 25Hz) in the three-
phase power system
• Sensitive reverse power protection
• Stator or rotor earth fault protection for special injection frequencies (e.g.
25Hz)
• etc.
The filter output can also be connected to the measurement function blocks such as
CVMMXN (Measurements), CMMXU (Phase current measurement), VMMXU
(Phase-phase voltage measurement), etc. in order to report the extracted phasor
values to the supervisory system (e.g. MicroSCADA).
The following figure shoes typical configuration connections required to utilize this
filter in conjunction with multi-purpose function as non-directional overcurrent
protection.
IEC13000179-1-en.vsd
IEC13000179 V1 EN-US
Figure 294: Required ACT configuration
Such overcurrent arrangement can be for example used to achieve the
subsynchronous resonance protection for turbo generators.
13.1.3 Setting guidelines
13.1.3.1 Setting example
GUID-5A3F67BD-7D48-4734-948C-01DAF9470EF8 v2
A relay type used for generator subsynchronous resonance overcurrent protection
shall be replaced. The relay had inverse time operating characteristic as given with
the following formula:
01
op
s
K
t T
I
= +
EQUATION13000029 V1 EN-US
(Equation 523)
Section 13 1MRK 506 369-UEN B
System protection and control
582 Line distance protection REL670 2.2 IEC
Application manual