Section 4 1MRK 505 350-UEN
Busbar protection
34 Technical Manual
Distributed busbar protection REB500
Figure 6 Busbar protection - Operating characteristics
The setting for the differential current alarm is entered as a percentage of the
minimum fault current setting
. The alarm should be set lower than the
lowest load current. A typical setting is 5%.
Should the differential current alarm pick up, alarm is not actually given until the
set time delay has expired. A typical setting is 5s.
Nothing has to be configured in HMI500 for the phase comparison
algorithm. The settings for this function are determined when
engineering the scheme for a particular application. The parameters
involved are the operating angle
j
and the two minimum
current settings (L1, L2, L3 and L0) for the inclusion of a feeder in
the evaluation.
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