• VLF 8 Page Brochure

 Very Low Frequency AC Hipots
AC testing of cables and electrical
apparatus is now easier than ever.
Since the introduction of the High Voltage, Inc. line of
portable and affordable VLF hipots, there is a practical
method of AC field-testing various loads, particularly
HVI – The World’s VLF Source cables and rotating machinery. High Voltage, Inc. offers a
Nearly 70 countries served since 1998
full line of VLF AC Hipots from 28 kVac to 200 kVac with
• Greatest Model Selection
models that can test up to 50mF of load, cables over 50
• Highest Voltages Available
• Highest Power Ratings Delivered miles in length and the largest of generators/motors. Use
• Only VLF Thumper Produced
VLF for AC stress tests and/or as a voltage source for
• Rugged oil filled non-electronic
design offers extreme reliability and Tan Delta and Partial Discharge cable diagnostic testing.
2 ease of field service if ever necessary
SINCE 1998, HVI has produced the most rugged and reliable
Models Available
VLF products available. Our electro-mechanical control and our
HVI offers more models and higher voltage mod-
els than any other vendor in the world. Models oil filled HV power supply designs are extremely dependable,
range from 28kV – 200kV, offering from 0.4mF to and if necessary, more easily field serviced than the electronic
50mF of load capability.
designs of others. The HVI design has a proven 12 year track
VLF-28CM 0-28 kVac, 0.1 Hz, load rated to 0.4 mF record with over 900 units in service. The HVI VLF design
VLF-4022CM 0-44 kVac, 0.1 Hz - 0.02 Hz, load rated to 5.5 mF offers the best of everything, with manual, easy to use controls
VLF-50CM 0-50 kVac, 0.1 Hz - 0.01 Hz, load rated to 50 mF but also sophisticated data collection. Electric utilities and
VLF-6022CM 0-60 kVac @ 50Hz, 0.1 Hz - 0.02 Hz, industrials have long recognized the benefit of our technology.
load rated to 5.5 mF
0-62 kVac @ 60Hz HVI knows how to build long lasting field test equipment.
VLF-65CMF 0-65 kVac, 0.1 Hz - 0.01 Hz, load rated to 22 mF The HVI VLF design produces a sine wave output that meets
VLF-90CMF 0-90 kVac, 0.1 Hz - 0.02 Hz, load rated to 2.75 mF all requirements of world standards, permitting it to be used
VLF-12011CMF 0-120 kVac, 0.1 Hz - 0.01 Hz, load rated to 5.5 mF as a voltage source for Tan Delta and Partial Discharge cable
diagnostic testing. Non sine wave producing VLF designs are
VLF-200CMF 0-200 kVac, 0.1 Hz - 0.02 Hz, load rated to 3.75 mF
VT33 VLF Thumper, 0 – 33kVac, 1uF @ 0.1Hz
limited in this ability and may reduce the users’ options in the
13kV @ 760 joules discharge, TDR ready future to use the VLF for diagnostic testing. Stick to the HVI sine
wave producing VLF.
The HVI VLF technology is protected
under U.S. Patent # 6,169,406
HIGH VOLTAGE, INC. 31 County Route 7A • Copake, NY 12516 • (518) 329-3275 • Fax: (518) 329-3271 • www.hvinc.com
 SCOPE
Why Buy HVI VLF Products? 60
0
The HVI Design – Portable, Affordable, Rugged, & Reliable
PEAK
KILOVOLTS
What is VLF? or soak test, none of which provide meaningful
information about a cables ability to withstand POS
VLF stands for Very Low Frequency. A VLF hipot
several times normal AC voltage. IEEE 400, IEEE
is an AC output high voltage instrument. HVI VLF
400.2, VDE 0276, CENELEC HD 620/621, and IEC
products provide sinusoidal AC voltage and cur-
60060-3 standards define VLF cable testing.
rent but at 0.1 Hz - 0.01 Hz, compared to the 50/60
VLF is also very useful for testing large rotating NEG
Hz output of conventional AC test sets. It is still an
machinery, since it provides a portable and affordable
AC voltage with sinusoidal polarity reversals every
method of field testing coils and is sanctioned by the
half cycle. The VLF instrument is used to provide a
IEEE 433 standard.
simple go/no-go, or pass/fail, withstand test. Also,
HVI VLF instruments can be used as the voltage Partial Discharge & Tan Delta
source for performing off-line Partial Discharge
and Tan Delta cable diagnostic testing. OUTPUT VLF CableMILLIAMPERES
PEAK Diagnostic Testing
The VLF hipot by itself provides a withstand, or
Why VLF? 0 60
proof test. It can also be used as the voltage source
for CAPACITANCE and tan delta cable
off-line partial discharge
6.0 CABLE
VLF test sets are used to field test high capacitance
0
loads like cables and motors/generators. The lowerMICROFARADS can serve the needs of the
diagnostic testing. HVI
the frequency of an AC source, the lower the cur- industry for cable testing better than any other.
START
rent and power required to apply a voltage to a ca- Contact HVI for additional information on other 3
5
TIMER
pacitive load like a cable. At 0.1Hz, it requires 600 cable testing methods and products available.
times less power to test a cable than at 60Hz. The
Benefits of HVI VLF AC Hipots
30
HVI VLF instruments permit users to field test
long cables and large generators with a portable For more information on VLF testing, download our
and affordable test set. A 100 lb VLF instrument VLF FAQ from our website: www.hvinc.com
can do the job of a multi-ton 60Hz AC test set. • Portable and affordable
Cables should be tested with AC voltage. With the • All models feature a true sinewave output
HVI VLF products, it can be down with a practical, • Waveform is independent of load
economical, and easy to use CAPACITANCE
package. capacitance between 0.01 mF and METER
When and Where Is VLF Used –
SCALE X10 maximum load 60
μF
• Highest load ratings available mA
Cable & Rotating Machinery
PUSH TO READ CAP
• Highest voltage models available
X1
The principal use of VLF is testing medium and ZERO
• Simple and easy operation
high voltage shielded power cables. A long cable • AC testing does not degrade good
may have many microfarads of capacitance. To AC cable insulation
high voltage test this cable requires the use of VLF • Harmful space charges are not injected
technology. An AC voltage test is the best way to
verify the AC integrity of a cable. If a cable can’t
into the cable insulation
• No traveling waves are generated during
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hold 2 – 3 times normal voltage, it is not healthy and testing
an in-service failure is likely. Use the VLF to cause • BNC scope output for waveform viewing
defects to fail during the test. Find the fault, make • Rugged and reliable design less prone
the repair or replacement, and be left with a better to failure from transients
cable. It is especially valuable for verifying a cable • Much easier to service compared to
after installation or repair: far better than using a units with solid state design
DC hipot, 5kV megohmmeter, hot stick adaptor,
 VLF-28CM(F)
Our smallest VLF model, the VLF-28CM approaches the size and cost of a DC hipot and is designed for quick
& easy short-run cable testing. It can test up to 0.4 μF of load, or up to 4000 feet (1200 m) of a typical 15 kV
class cable. Small, light, inexpensive. Now there is no reason not to use VLF.
Input: 120 volts, 60 Hz, 5 A peak, 2.5 A average
or 230 volts, 50/60 Hz, 3A peak, 2A average (F suffix)
Output: 0 – 28 kVac peak, 0.1 Hz, sinusoidal
Duty: Continuous
Load Rating: 0.4μF
Metering: Voltmeter: -30 – 0 – +30kVac
Charging Current meter: 0 – 50 mA peak
HV Cable Output: Shielded EPR output cable - 20 ft. (6 m)
Size & Weight: 15” w x 11.5” d x 22” h, 75 lbs.
381 mm w x 292 mm d x 559 mm h, 34 kg
VLF-4022CM(F)
is model, with its 44 kVac peak output, is suitable for testing cables rated up to 25 kV. Its high load
capacity enables it to test up to approximately 10 miles of cable, depending on type. is model includes
a charging current and load capacitance meter, and a center zero peak kilovolt output meter.
Input: 120 volts, 60 Hz, 10 A peak, 5 A average
or 230 volts, 50/60 Hz, 6 A peak, 2.5 A average (F suffix)
Output: 0 – 44 kVac peak, 0.1/0.05/0.02 Hz sinusoidal
Duty: Continuous
Load Rating: 1.1μF @ 0.1 Hz, 2.2μF @ 0.05 Hz, & 5.5μF @ 0.02 Hz
Metering: Voltmeter: Center Zero -40 – 0 – +40 kVac peak
Charging Current meter: 0 – 100 mA peak
Load capacitance meter: 0 – 6 Microfarads
4
Cable Lengths: Shielded RG/8U output cable - 20 ft. (6 m)
Interconnect cable - 10 ft. (3 m)
Size & Weight: Controls: 22” w x 11.25” d x 15.25” h, 50 lbs.
559 mm w x 286 mm d x 387 mm h, 23 kg
HV Tank: 14.5” w x 10.5” d x 19” h, 72 lbs.
Two-piece easy portability 368 mm w x 267 mm d x 483 mm h, 33 kg
VLF-6022CM(F)
is model, with its 60 kVac peak output, is suitable for testing cables rated up to 35 kV. Its high load
capacity enables it to test up to approximately 10 miles of cable, depending on type. is model includes
an enhanced features package: a charging current and load capacitance meter, test dwell timer, and
polarity indicating lights.
Input: 120 volts, 60 Hz, 15 A peak, 7.5 A average
or 230 volts, 50/60 Hz, 8 A peak, 4 A average (F suffix)
Output: 0-60 kVac peak @ 50Hz, 0.1 Hz - 0.02 Hz,
load rated to 5.5 μF
0-62 kVac peak @ 60Hz
Duty: Continuous
Load Rating: 1.1 μF @ 0.1 Hz, 2.2 μF @ 0.05 Hz, & 5.5 μF @ 0.02 Hz
Metering: Voltmeter: 0–60 kVac peak
Charging Current meter: 0 – 100 mA peak
Load capacitance meter: 0 – 6 Microfarads
Settable test duration timer
Cable Lengths: Shielded EPR output cable - 20 ft. (6 m)
Interconnect cable - 10 ft. (3 m)
Size & Weight: Controls: 26” w x 13” d x 16” h, 75 lbs.
660 mm w x 330 mm d x 406 mm h, 34 kg
Two-piece easy portability HV Tank: 15” w x 10.25” d x 21.5” h, 120 lbs.
381 mm w x 260 mm d x 546 mm h, 54 kg
HIGH VOLTAGE, INC. 31 County Route 7A • Copake, NY 12516 • (518) 329-3275 • Fax: (518) 329-3271 • www.hvinc.com
VLF-65CMF
The VLF-65CMF is a higher power model designed to test very long cables
SCOPE
rated up to 35kV. It offers the complete controls package including Cable
Burn mode. Its cable reels provide 100’ (30m) of HV and ground cable.
Input: 230 V, 50/60 Hz, 30A peak, 25A average
60
0-65 kVac peak, 0.1/0.05/0.02/0.01 Hz sinusoidal
0
Output:
Duty: Continuous
Load Rating: 2.2 mF @ 0.1 Hz, 4.4mF @ 0.05 Hz
Metering:
11 mF @ 0.02 Hz & 22 mF @ 0.01 Hz
Voltmeter: 0-75 kVac peak PEAK
Charging Current Meter: 0 – 200 mA peak KILOVOLTS
Load capacitance meter: 0 – 6 microfarads
User programmable test duration timer POS
Cable Lengths: Shielded EPR output cable - 100 ft. (30m)
Ground cable 100 ft. (30m)
Sizes & Weight: Controls: 17” w x 11” d x 9.5” h, 20 lbs.
432mm w x 280mm d x 241mm h, 9 kg
Regulator: 20” w x 14” d x 27” h, 160 lbs.
508mm w x 356mm d x 686mm h, 73 kg NEG
HV Tank: 15” w x 18” d x 22” h, 215 lbs.
381mm w x 457mm d x 559mm h, 98 kg
Overall: 30” w x 60” d x 51” h, 704 lbs.
762mm w x 1524mm d x 1295mm h, 320 kg
VLF-90CMF
The VLF-90CMF offers 90kVac peak output voltage, suitable for testing
cables rated 45 – 50kV. It is load rated for 0.55mF @ 0.1Hz, capable of test-
OUTPUT PEAK
ing up to 2 miles of cable, five times that at 0.02Hz. Pictured with optional MILLIAMPERES
hand truck.
Input:
Output:
0
230 V, 50/60 Hz, 20A peak, 15A average
0-90 kVac peak, 0.1/0.05/0.02 Hz sinusoidal
60
Duty: Continuous
.55 mF @ 0.1 Hz 6.0
CABLE CAPACITANCE
0
Load:
1.1 mF @ 0.05 Hz MICROFARADS
2.75 mF @ 0.02 Hz
Metering: Voltmeter: 0-100 kVac peak
Current Meter: 0 – 100 mA peak 5
Load capacitance: 0 – 6 microfarads
User programmable test duration timer
Cable Lengths: Shielded EPR output cable – 20 ft. (6m)
30
Interconnect cable - 10 ft. (3m)
Sizes & Weights: Control: 26” w x 13” d x 16” h, 75 lbs.
660 mm w x 330 mm d x 406 mm h, 34 kg
HV Tank: 15” w x 21” d x 29” h, 293 lbs.
VLF-12011CMF
The VLF-12011CMF provides a 120kVac peak output voltage, suitable for
VLF hipot testing 69kV cable and as a voltage source for partial discharge and
CAPACITANCE
tan delta testing of 115kV cable. In addition to the standard controls described, METER
SCALE X10
this model also contains a Cable Burn mode. Cable reels provide 100’ (30m)
of HV and ground cable.
60
μF mA
230 volts, 50/60 Hz, 30A peak, 25A average
Input:
Output: 0-120 kVac peak,PUSH TO READ sinusoidal
0.1/0.05/0.02/0.01 Hz CAP
Duty: Continuous X1 ZERO
Load Rating: .55 mF @ 0.1 Hz, 1.1mF @ 0.05 Hz
2.75 mF @ 0.02 Hz, 5.5mF @ 0.01 Hz
Metering: Voltmeter: 0-120 kVac peak
Charging Current Meter: 0 – 100 mA peak
10
Load capacitance meter: 0 – 6 microfarads
User programmable test duration timer
Cable Lengths: Shielded EPR output cable 100 ft. (30m)
Ground cable 100 ft. (30m)
Sizes & Weight: Controls: 17” w x 11” d x 9.5” h, 20 lbs.
432mm w x 280mm d x 241mm h, 9 kg
Regulator: 20” w x 14” d x 27” h, 160 lbs.
508mm w x 356mm d x 686mm h, 73 kg
HV Tank: 26” w x 20” d x 22” h, 390 lbs.
660mm w x 508mm d x 559mm h, 177 kg
Overall: 30” w x 60” d x 51” h, 853 lbs.
762mm w x 1524mm d x 1295mm h, 388 kg
 VLF-200CMF
The VLF-200CMF provides a 200kVac peak output voltage, suitable for
performing VLF hipot tests on 138kV cable and as a voltage source for
tan delta and partial discharge testing on 230kV cable. The controls
offer all the features of our other VLF models along with VLF Cable
Burning. Trailer mount optional.
Input: 230V Single phase, 80A peak, 50/60Hz
Output: 0 – 200kVac peak, 100mA. Bushing output with no cable provided
Load: .75mF @ 0.1Hz, 1.5mF @ 0.05Hz, 3.75mF @ 0.02Hz
Duty: Continuous
Metering: Voltage: 0 – 200kVac peak 3.5” analog display
Current: 0 – 200mAac 3.5” analog display
Controls: HV On/Off, Motorized Voltage Control, Zero Start Interlock,
External Interlock, Digital Dwell Timer, Capacitance Measuring
Circuit, Cable Burn Mode, Fixed 120% Overload,
Automatic Data Logger
Size/Weight: Controls: 24”w x 25.5”d x 71”h, 650lbs.
61cm h x 65cm w x 180cm h, 295kg
HV Tank: 59”w x 37”d x 87”h, 3700lbs
155cm w x 93cm d x 220cm h, 1678kg
Contact HVI about trailer
6 mounting options
VLF Fault Locator Combination
VT33(F)
The VT33 is the worlds only combination VLF hipot and cable fault locator,
or thumper. It is the complete tool for AC testing and fault locating cables
rated up to 25kV. It offers a 33kVac peak VLF output, VLF Cable Burn
mode, and a 760 joule discharge output. It is fully TDR/radar ready.
Input: VT33: 120V, 60 Hz, 10A
VT33F: 230V, 50/60 Hz, 5A
VLF Hipot Output: 0 – 33 kVac peak @ 0.1 Hz
Load Capability: 1mF or more than 1 mile (1.6 km) of 15kV & 25 kV cable
Discharge Output: 0 – 13 kVdc @ 760 joules
Discharge Rate: Every 8 seconds
VLF Burner: Arcs cable every few seconds
TDR Interface: Arc Reflection & Current Impulse
Size & Weight: 28”w x 26”d x 44”h, 245 lbs.
711mm w x 660mm d x 1118mm h, 111kg
Cable Outputs: 50’ (15m) shielded HV cable & ground
HIGH VOLTAGE, INC. 31 County Route 7A • Copake, NY 12516 • (518) 329-3275 • Fax: (518) 329-3271 • www.hvinc.com
 SCOPE
0 60
Simple to use, PEAK
KILOVOLTS
POS
manual controls.
No programming
NEG
necessary.
OUTPUT PEAK MILLIAMPERES
VLF-6022CM 0 60
6.0 CABLE CAPACITANCE 0
Front Panel
MICROFARADS
Selecting a VLF Model
There are three main considerations when selecting the appropriate model : voltage, uF rating, uF rating at 0.1Hz.
7
Voltage: What is the voltage rating of the cables to be tested? Below is a summary of the IEEE test voltages
recommended. While IEEE400.2 does not include HV cable, field experience shows the test voltage used is ~ 2 times
normal line-to-ground. 30
kVrms kVrms (kVpk) kVrms (kVpk) kVrms (kVpk)
25 27 (38) 31 (44) 23 (33)
CAPACITANCE METER
SCALE X10
load, hence the need for lower frequencies to perform an AC field test. To select the appropriate VLF model, either
60
μF Rating: VLF hipots are rated by the capacitance of the loads they can test. A cable or generator is a high capacitance
the load capacitance must be known or the cable length if the mF/ft or mF/m is known.
μF mA
PUSH TO READ CAP
ZERO
The length of solid dielectric cable that X1 be tested depends on the voltage rating and size, with higher voltage
can
ratings and smaller cable diameters lower in capacitance. The below numbers are for when using the 0.1Hz output
frequency. At 0.05 Hz, twice the length shown can be tested. At 0.02Hz, five times the length shown can be tested.
Model Cable Rating Cable Test Length @ 0.1 Hz
VLF-28CM
VLF-4022CM
15kV
15kV
.4 – 1 mile or .64 – 1.6 km
1 – 2 miles or 1.6 – 3.2 km 10
25kV 1.5 – 3 miles or 2.4 – 4.8 km
VLF-6022CM 35kV 2 – 4.2 miles or 3.2 – 6.8 km
VLF-12011CMF 69kV 1.5 – 2 miles or 2.4 – 3.2 km
VLF-200CMF 138kV 2 – 3.5 miles or 3.2 – 5.6 km
μF Rating at 0.1Hz: If the VLF is to be used as a voltage source for performing Tan Delta and Partial Discharge test-
ing, then the load rating at 0.1Hz is important, as this is the frequency that these tests are performed. If the VLF is to
be used for hipoting, then any frequency from 0.1Hz - 0.01Hz can be used.
 SCOPE
VLF Cable Burning
The VLF-50CMF, VLF-65CMF, VLF-12011CMF, & the VLF-200CMF models are equipped with a Cable Burn mode. A VLF
burner is one of the most effective methods of reducing a cable fault’s impedance, or arc-over voltage, in order to permit the use
of lower voltage and energy rated fault locators – thumpers. For instance, the VLF-12011CM can be used to burn down faults on
0 60
138kV cable to lower the arc-over voltage to where the HVI CDS-3632U thumper can easily fault locate, with its 9/18/36 kV @
3200 joules discharge rating.
PEAK
The VLF hipot applies its voltage to the faulted cable. The voltage output raises to the arc-over level and the cable arcs. The
KILOVOLTS
current of the VLF and the stored energy in the cable discharges into the fault. This process continues, but now in the opposite
polarity, as the sine wave output of the VLF continues. This arcing of the cable fault repeatedly in opposite polarities rapidly
POS
reduces the fault voltage.
Accessories Hand Truck for
The ADL-1 data logger is designed to monitor, record, and wirelessly NEG
VLF-4022CM(F),
download all test data from an HVI Very Low Frequency tester to a VLF-6022CM(F),
computer. Users of HVI VLF & VLF-90CMF
products now have the best
of both worlds: economical
and simple to operate VLF
testers along with full test data
collection. Use a laptop on-site OUTPUT PEAK MILLIAMPERES
to watch and record the test or
store all results in the ADL-1 0 60
for later downloading. Win-
dows compatible only. 6.0 CABLE CAPACITANCE 0
Current HVI VLF units MICROFARADS
can be modified to use the
START
ADL-1. One interface cable
TIMER
connects the data logger to
the VLF. The ADL-1 comes
equipped with 802.11g wireless
30
communications, which is backwards compatible with 802.11a & b, Cable Reels
and an Ethernet connection. Internal memory can record approxi- 100’ HV &
mately 40 hours of testing. Ground Cables
Fault Locators - Surge Generators - Thumpers
HVI offers several of the top Thumpers available, all with three variable output voltages, three full energy discharge voltages,
CAPACITANCE METER
the highest burn currents, and full TDR/radar compatibility. HVI offers the complete package – don’t buy less.
SCALE X10 60
FEATURES CDS-2010U CDS-3616U
μFCDS-3632UmA
PUSH TO READ CAP
X1 ZERO
10
www.hvinc.com
05/2009