ABB Relion 670 Series Applications Manual page 142

Section 8
Current protection
Common base IED values for the primary current (
SBase ) are set in global base values for settings function GBASVAL.
power (
GlobalBaseSel : Selects the global base value group used by the function to define IBase , VBase and
SBase . Note that this function will only use IBase value.
8.3.4.1 Settings for each step
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 16:
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
User Programmable
ASEA RI
RXIDG (logarithmic)
The different characteristics are described in the Technical Reference Manual (TRM).
136
When inverse time overcurrent characteristic is selected, the trip 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 important to set the definite time delay
for that stage to zero.
x means step 1, 2, 3 and 4.
Inverse time characteristics
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IBase ), primary voltage ( VBase ) and primary
Phasor measurement unit RES670
1MRK 511 407-UUS Rev. J
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
GUID-CFB327EF-C5C4-44B5-AB4B-9C2916355FC5 v5
Application manual