Horstmann ComPass B - Device Functions; Fault Detection and Indication

Instructions for Use
ComPass B 4023841-001
Capacitive insulators2.6.
In air-insulated switchgear units capacitive insulators are used for voltage coupling to the
ComPass B.
Example for insulatorsFigure 8:
Device functions3.
Fault detection and fault indication3.1.
Fault detection3.1.1.
Figure 9 below represents a schematic illustration of a medium-voltage network. The ComPass B
is or can be installed in any switchgear unit.
The instrument measures permanently the phase voltages and currents taking these values as a
basis for real time calculations of the neutral point displacement voltage V
NE
and earth fault current
I
E
.
Based on these values the ComPass B is able to detect faults in medium-voltage networks and also
to determine their characteristics.
Schematic illustration of a MV networkFigure 9:
6
Dipl.-Ing. H. Horstmann GmbH