ABB REB500 - BP Licenses; CT Grounding

Section 4 1MRK 505 353-UEN
System functions
34 Application Manual
Bay protection functions REB500
4.2 BP Licenses
The menu “Configuration / BP Licences” provides an overview of licensed and
configured protection function groups for each bay unit is shown.
Figure 21 licensed BP function groups
4.3 CT grounding
The location at which the CT neutrals are grounded (line or busbar side) is of con-
sequence to directional protection functions (Distance protection DIST, Directional
overcurrent definite time protection DIROCDT and Directional overcurrent inverse
time protection DIROCINV).
The following table lists the functions with provision for configuring the location
of the CT neutral ground:
Table 43 CT grounding setting
Protection function Provision for configuring the CT ground?
Distance protection
yes
Directional overcurrent definite time protection
no
Directional overcurrent inverse time protection
no
The default setting for the last two functions is busbar side, but if a Distance pro-
tection function has been configured, its setting (line or busbar side) applies for the
directional overcurrent functions as well.