1MRK 500 124-UEN Section 3
HMI500
Operation Manual 19
Distributed busbar protection REB500
provide facility for changing the default colors for open, closed or invalid objects
to suit your needs.
Figure 9 Updated single-line diagram
3.5.2 Protection zone measurements
This dialog displays the actual values of measured variables for each protection
zone (restrained differential current of the bus bar protection function). The
protection zones are determined by the positions of the isolators and the bus-tie
breakers (bus bar image).
3.5.2.1 Overview
The currently active protection zones are listed in order showing the associated
sections of busbar and the differential current per phase or in the neutral. The
overview is not updated automatically. Click on “Refresh” to update the list.
A protection zone to which no measurement has been assigned, i.e. no bay unit
current is processed by the busbar protection algorithm, is shown as invalid.
Protection zones that have been connected, e.g. via a pair of feeder isolators or a
longitudinal isolator, are also presented.
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