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Possible equipment damage or data loss
This safety concept was type tested and ensures the operators safety in the worst case, namely when
the cable is accidentally energized during the measurement.
• The voltages on the housing of COMPANO 100 will be limited to a safe level.
• The voltages in COMPANO 100 may damage the equipment irreversible, if the is accidentally
energized or the cable length or open-loop voltage is far too high.
To protect the equipment, it’s essential to follow all instructions in the following chapters.
Death or severe injury caused by high voltage or current.
Only enter the high-voltage area when a safe state of the test setup can be
assured.
Before entering the high-voltage area, make sure that no hazardous voltage
is present and all voltage carrying parts have visible, appropriate and safe
connection to ground potential.
Death or severe injury caused by mechanical impact.
Currents flowing from the CP GB1 into the ground can result in considerable
mechanical movement of the CP GB1.
Place the CP GB1 at least 10 m away from COMPANO 100.
If possible, securely mount the CP GB1 to reduce the possibility of
movement.
2.2 Handling of the CP GB1 Grounding Box
The handling and maintenance of the CP GB1 Grounding Box is described in Section 2.4 of the CP CU1
user manual [2].
It describes how to install the suitable ground studs and connect the CP GB1 to the cable.
Carefully read this section in the CP CU1 user manual before continuing.
2.3 Measurement Method
COMPANO 100 uses the so-called frequency selective method to measure the cable impedance.
A test current with a frequency of 30 Hz and 70 Hz at 50 Hz systems or 40 Hz and 80 Hz at 60 Hz systems
is injected.
Then, the voltage drop caused by this test current is measured frequency selective to the output frequency.
Therefore, distortions at mains frequency or harmonics will have virtually no impact on the accuracy of the
measurement result.
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