Device Functions; Capacitive Insulators - Horstmann ComPass B Instructions For Use Manual

Instructions for Use
2.6.

Capacitive insulators

In air-insulated switchgear units capacitive insulators are used for voltage coupling to the
ComPass B.
3.

Device functions

3.1. Fault detection and fault indication
3.1.1. Fault detection
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
I .
E
Based on these values the ComPass B is able to detect faults in medium-voltage networks and also
to determine their characteristics.
6
Figure 8: Example for insulators
Figure 9: Schematic illustration of a MV network
Dipl.-Ing. H. Horstmann GmbH
and earth fault current
NE
ComPass B 4023841-001