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| HVA
30/5 - VLF and DC Hipot Instrument |
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The
HVA30/5 provides the testing and
commissioning engineer with a
versatile high voltage power
source suitable for testing
electrical plant including cables:
XLPE, PE, EPR, PILC etc,
capacitors, switchgear,
transformers, rotating machines,
insulators and bushings. The HVA30/5
provides increased power for the
longer cable runs.
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It
is well known that DC testing of
aged extruded cable such as XLPE
and EPR is potentially damaging to
the cable insulation causing
premature failure of the cable
under service conditions. Any
form of DC testing has been found
to be ineffective in detecting
even serious faults in such
cables. It is because of these
limitations that International and
National bodies such as CENELEC,
VDE, SABS and the IEEE now
recommend testing utilising low
frequency AC test systems. VLF
testing enables the cable test
engineer to detect insulation
defects before the cable fails in
service.
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HVA30/5 has a very
advantageous power / weight ratio.
At 50kgs the HVA30/5 is one
the lightest VLF test systems of
its rating available today. Apart
from the VLF output the HVA30/5
can also produce either polarity
DC together with a cable sheath
/jacket testing modes. The output
test sequences, which are easily
set by the operator, can be either
set manual or fully automatic operation.
In the VLF mode the HVA30/5 will
output 23kV RMS into a 0.5µF at
0.1Hz. However, as the VLF
frequency can be adjusted, loads
of up to 2.5µF can be tested with
an output frequency of 0.02Hz.
The output VLF waveform is load
independent and symmetrical thus
avoiding destructive space
charge effects caused by DC
polarisation. To further assist
the operator the HVA30/5 will
automatically calculate the
optimum output frequency for
larger loads. All test results are
stored on a on-volatile memory for
downloading to a PC for review and
analysis. |
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Lightweight
portable unit |
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Solid
state air insulated design
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True
sine wave low frequency
output |
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Suitable
for VLF, DC and Jacket/
sheath testing |
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Fault
conditioning capability |
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Test
result storage capability |
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Full
short circuit protection
with arc management
regulation |
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Compliance
with CENELEC, IEEE 400.2,
VDE 0296 and other
international standards |
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Manual
or fully automatic test sequence
selection |
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See
the Datasheet
for
more Technical Information
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