Protection Zone Measurements; Overview - ABB RELION REB500 Operation Manual

Section 4
HMI500
IEC18000490 V1 EN-US
Figure 9:
4.5.2

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).
4.5.2.1

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 Refresh to update the list.
A protection zone to which no measurement has been assigned, that is no bay unit current is
processed by the busbar protection algorithm, is shown as invalid.
Protection zones that have been connected, for example, via a pair of feeder isolators or a
longitudinal isolator, are also presented.
20
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