ABB Relion 670 Series Applications Manual page 181

1MRK 505 370-UUS Rev. K
Common base IED values for the primary current (IBase), primary voltage (VBase) and primary power
(SBase) are set in global base values for settings function GBASVAL.
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.
7.4.4.1 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 31:
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).
Pickupx: Operation negative sequence current level for step x given in % of IBase.
Busbar protection REB670
Application manual
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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Section 7
Current protection
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
GUID-CFB327EF-C5C4-44B5-AB4B-9C2916355FC5 v5
175