Location; Parts Of The Icmflex Under High Voltage Potential; Connecting The Icmflex - Megger Power Diagnostix ICMflex User Manual

ICMflex
Partial discharge and loss factor measurement system
3.3

Location

As mentioned above in the general procedure prior to installation, please search for a safe location close the
specimen to install the equipment. Ask for a scaffold, delineation, or covered area, if required, as shown in
Figure 4, and prevent environmental conditions with high relative humidity and extreme temperatures.
3.4

Parts of the ICMflex under high voltage potential

The ICMflex is designed via a unique concept. The entire acquisition unit is directly placed on high voltage po-
tential right at the position where the necessary signals are. This offers the advantage that no additional signal
cables are needed. The filter units are constructed via the same principle. The parts that are on high voltage
potential are marked with warning signs to prevent confusion during set-up (see Figure 5 in section 3.5).
The complete head box, including the corona cage surrounding the top of the reference capacitor and both
MC connectors on the in- and output, is under high voltage potential. The bottom plate of the ICMflex and
corresponding filter unit are at ground potential.
3.5

Connecting the ICMflex

Please read the application notes for testing of medium and high voltage cables and rotating machines for
their specific set-up overview. In general, the main connections are explained below.
The appropriate connection of the HV source (HV transformer, resonance test set, VLF high potential) to the
filter and/or ICMflex is mentioned on the top covers of both filtering unit and ICMflex. Please follow the con-
nection indicators accordingly.
The HV cable of the power supply has to be connected to the female input connector of the filter (at the
left-hand side of Figure 5) or, if a filter is not needed, directly to the input of the ICMflex. A bridge needs to
be established from the male output connector of the filter (at the right-hand side of Figure 5) to the female
connector of the ICMflex. Finally, the male connector of the ICMflex needs to be connected to the specimen.
This can be a motor terminal or the conductor of a shielded high voltage cable or a stator bar. Of course, the
interconnection between filter and ICMflex is not necessary if no filter is used.
14 User guide for ICMflex
Figure 4: MV cable testing on-site
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