ABB RET670 Applications Manual page 449

1MRK504116-UUS C
Application manual
VBase: Base voltage level in kV. This voltage is given as a phase-to-phase voltage and
this is the reference for voltage related settings of the function. This voltage is
internally divided by √3.
When inverse time overcurrent characteristic is selected, the operate
time of the stage will be the sum of the inverse time delay and the set
definite time delay. Thus, if only the inverse time delay is required, it is
of utmost importance to set the definite time delay for that stage to zero.
Settings for each step
x means step 1, 2, 3 and 4.
DirModeSelx: The directional mode of step x. Possible settings are off/nondirectional/
forward/reverse.
Characteristx: Selection of time characteristic for step x. Definite time delay and
different types of inverse time characteristics are available.
Table 97: Inverse time characteristics
Curve name
ANSI Extremely Inverse
ANSI Very Inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI/IEEE Definite time
ANSI Long Time Extremely Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
IEC Normal Inverse
IEC Very Inverse
IEC Inverse
IEC Extremely Inverse
IEC Short Time Inverse
IEC Long Time Inverse
IEC Definite Time
Table continues on next page
Section 3
IED application
443