Description
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. In addition, DC "proof" or hipot testing
has been found to be ineffective in detecting serious defects
in cables. Since this is the main objective of any hipot test,
and due to the negative side effects of DC, VLF AC waveform
testing is now recommended by almost all cable testing
standards.
Acceptance or
maintenance hipot/proof testing using VLF high voltage
sinusoidal AC allows the operator to efficiently detect
serious cable insulation defects, before they result in an
in-service failure, without affecting those healthy sections
of the cable that still have remaining service life.
Features
The smallest, lightest, most
advanced universal high voltage test instrument of its type
available.
VLF (0.1Hz), DC (±),
Cable Fault Conditioning (Burning), and Sheath/Jacket
testing modes all included.
VLF: the proven and
accepted replacement for the traditional DC Hipot or "proof"
test for solid dielectric cables such as XLPE and EPR.
Fully Automatic or
manual cable test sequences complying with International
Standards/Guides such as IEEE 400.2, VDE 0276, CENELEC,
HD620 S1, NEN 3620, SANS 10198 and IEC 60060-3 (draft).
Meets all your
cable testing requirements.
True Symmetrical
Sinusoidal, load independent, output waveform across the
full load range.
Real-time Display
of actual output waveform.
Easy-to-use,
ergonomic, menu-guided, large backlit user interface.
Large output load
capability (up to 10µF).
Automatic and
integrated load capacitance measurement with optimum
frequency selection.
Storage of test
results for later retrieval or download to a PC/Laptop.
No oil or arcing
contacts that require routine maintenance.
Short circuit
protected with active arc management regulation that avoids
the tripping of conventional HV test equipment when a
dielectric failure occurs.
Applications The HVA90 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 IEEE-433), insulators and
bushings.
Product design
The HVA90 is the most advanced HV test system available, its
also the lightest, most compact instrument of its type on the
market. The HV90 has the highest power to weight ratio of any
comparable unit available. There is no need to carry two
pieces of equipment around and then interconnect them!
Apart from the variable frequency VLF
output, the operator can also select dual polarity DC cable
jacket or sheath testing output modes.
The applied test voltage, current,
capacitance, resistance and time are displayed and recorded.
The instrument is easily programmable allowing the operator to
setup or select test sequences in either automatic or manual
mode.
The HVA90 is capable of testing 1µF
(Approx 3300m / 11,000 ft of cable) at 0.1Hz and 64kV rms. The
frequency of the output can be reduced allowing even larger
capacitance loads to be tested. At 0.01Hz approx 33,000m /
100,000ft of cable can be tested. To assist the operator, the
instrument will automatically calculate the optimum frequency
to be selected for larger loads.
Should a breakdown
occur during testing, the actual voltage at which it occurred
is displayed and recorded. If cable burning (fault
conditioning) mode is activated, the fault resistance can be
conditioned to allow easier and less stressful fault location
techniques to be applied.
