Tripping Logic - ABB RELION REB500 Operation Manual

Section 5
Busbar protection
IEC18000459 V1 EN-US
Figure 8:
The setting for the differential current alarm is entered as a percentage of the minimum fault
current setting
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.
5.2

Tripping logic

I > I
diff
k=

IEC18000272 V1 EN-US
Figure 9:
40
Settings/Busbar protection - Operating characteristics
IKmin . The alarm should be set lower than the lowest load current. A typical
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 ⱷ
and the two minimum current settings (L1, L2, L3 and L0) for the inclusion of a
feeder in the evaluation.
diff set
I
diff
> k
I
set
restr
set
Busbar protection tripping logic
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Trip
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Distributed busbar protection REB500
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Technical manual
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