Instructions for Use
ComPass B 4023841-001
Isolated network operation (sinφ) •
In networks with isolated neutral, the ComPass B determines the direction of the reactive
power of the earth fault current (V
NE
× I
E
× sin φ).
Angle diagramFigure 11:
Voltage ring buffer3.1.3.
If there is a small distance between the location of the fault and the place of installation of the
ComPass B unit, the phase voltages of the affected phases may become too small to be usefull for
the decision of fault direction. For this reason, the Compass B is provided with a ring buffer. The
measured values of all phase voltages are permanently written into this buffer. In case of a fault
these voltages are extrapolated in time in order to obtain information on the phase relation.
Inrush current suppression3.1.4.
The ComPass B uses an inrush current suppression to avoid unintended tripping due to inrush. The
ComPass B can be adjusted such as to detect faults only when the phase voltages were previously
present for a preset time.
G
This function is deactivated in delivery status!
Fault indication3.1.5.
Faults are indicated locally by the multicolour LED and the OLED display, and remotely indicated
via the RS485/MODBUS interface/relays.
Multicolour LED •
The multicolour LED ashes red as long as ComPass B is indicating a fault.
OLED display •
In case of a fault, the OLED display presents a fault message informing on the type and di-
rection of the fault. For indication press any direction on the rocker switch.
V
NE
8
Dipl.-Ing. H. Horstmann GmbH
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