Model VLF-90CM
AC Hipot/Burner
0-90 kVac, with 0.1 to 0.02 Hz Output Frequency
Control Layout
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VLF-4022CM
AT LAST: A Powerful VLF AC Testing Solution for medium voltage, 44, 69 and 115 kV
class XLPE, PE, EPR, RL and PILC cables, splices, transition joints and T joints.
The High Voltage, INC. VLF series of AC Hipots finally enables utilities and
industry to economically AC field test cables and electrical apparatus instead
of DC testing (*VLF - Very Low Frequency).
VLF-25CM
What is VLF?
A VLF unit is an AC hipot with a 0.1 Hz or lower output frequency, used for AC
testing high capacitance loads. At 0.1 Hz, it requires 600 times less power to
test a cable, generator, etc., than at 60 Hz and 500 times less power than at 50
Hz. A VLF test is a go/no-go stress test. The load either holds the test voltage
or breaks down. It is the surest and easiest way to expose defects in cables
and generators.
Why VLF Hipot?
“Because DC testing can be harmful to cables and deleteriously cause faults
within the solid dielectric insulation of cables!” VLF testing exposes cable
defects while not harming good insulation.
A VLF test can detect cable defects at a much lower voltage than a DC hipot/
proof test. Also, voltage transients are much smaller with a VLF AC hipot test
during cable failure or flashover than with a DC hipot/proof test. There are no
travelling waves generated during VLF testing.
The VLF AC hipot also burns, breaks-down and conditions a cable fault much
quicker than conventional DC burners. Therefore, fault locating time is reduced
with existing thumpers and radar devices.
HIGH VOLTAGE, INC.
31 Rt. 7A: P.O. Box 408 • Copake, NY 12516 • (518) 329-3275 • Fax: (518) 329-3271
E-Mail: sales@hvinc.com • Web: www.hvinc.com
High Voltage, Inc. designs and manufactures high voltage test equipment for utility and industrial applications. Also available are Very Low
Frequency (VLF) high voltage AC test sets, DC power packs, AC and DC instrumented test sets, cable fault locators and other products.
Specifications, sizes, weights and features may vary slightly in the interest of continuous product improvement.
Model VLF-90CM AC Hipot/Burner
Description
The VLF-90CM is a continuously adjustable 0-90 kilovolt continuous duty
AC hipot with a 0.1/0.05/0.02 Hz sinusoidal output. The waveshape is
independent of capacitive loading and can test cables up to 25,000 feet
in length. The two piece design is suitable for test van or trolley mounting
and operates from a 230 volt electrical service.
Control Layout
Meets NEW IEEE 400.2 Standard
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• Smallest, lightest weight for a 90 kV
peak AC-VLF Hipot available with the
largest test load ratings
• Two-piece portability
• Simple and easy operation
Controls are elementary: Power ON and Raise/Lower switches, HV ON
and OFF, Fault Reset, and Start Timer pushbuttons, single range 100kV
peak kilovoltmeter and 100mA peak charging current meter. In addition,
a capacitance measurement circuit for pre-determining cable/load
capacitance is provided. For waveform viewing, a BNC output jack for
oscilloscope connection is included.
Specifications
Input:
230 V, 50/60 Hz, 20A peak, 15A average
Output:
Sinusoidal, 0-90 kVac peak, 0.1/0.05/0.02 Hz frequency
Continuous duty. 20 ft. shielded x-ray output cable
Load:
.55 �F (approx 5,000 ft of cable) @ 0.1 Hz
1.1 �F (approx 10,000 ft of cable) @ 0.05 Hz
2.75 �F (approx 25,000 ft of cable) @ 0.02 Hz
Metering:
Voltmeter: 0-100 kVac peak
Current Meter: 0 – 100 mA peak
Load capacitance: 0–6 microfarads
Sizes:
Control: 25��w x 13��d x 16��h, 635 mm w x 330 mm d x 406 mm h
HV Tank: 15��w x 21��d x 27��h, 381 mm w x 533 mm d x 686 mm h
Weights:
Control: 75 lbs. (34 kg)
HV Tank: 293 lbs. (133 kg)
• 230Vac, 50/60Hz input line required
• The VLF AC Hipot does NOT generate
harmful voids in the insulation through
treeing
• Harmful space charges are NOT
injected into the dielectric during testing
• A true-sinusoidal output voltage
waveform is used
• No traveling waves are generated
during testing
• Waveshape independent of capacitive
loading between 0.01�f and
maximum load
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• Rotating machinery-IEEE-433
• Shielded power cable-IEEE-400.2
• Capacitors
• Full reel cable
• Bushings & insulators
• Transformers
HIGH VOLTAGE, INC.
31 Rt. 7A: P.O. Box 408 • Copake, NY 12516 • (518) 329-3275 • Fax: (518) 329-3271
E-Mail: sales@hvinc.com • Web: www.hvinc.com
High Voltage, Inc. designs and manufactures high voltage test equipment for utility and industrial applications. Also available are Very Low
Frequency (VLF) high voltage AC test sets, DC power packs, AC and DC instrumented test sets, cable fault locators and other products.
Specifications, sizes, weights and features may vary slightly in the interest of continuous product improvement.
500VLF90/11/04