Very Low Frequency AC Technology – VLF

Very Low Frequency AC Technology – VLF
World’s Source for
Cable Testing &
Fault Locating
Technology
ISO 9001 : 2008
Advanced test equipment for high voltage proof and preventive maintenance testing of electrical apparatus +1.518.329.3275 | sales@hvinc.com | www.hvinc.com
SCOPE
Very Low Frequency
AC Technology – VLF
0
Cable & Motor/Generator
High Voltage Withstand
& Diagnostic Testing
60
PEAK
KILOVOLTS
POS
NEG
High Voltage, Inc.
Copake, NY USA
VLF leader since 1997
OUTPUT PEAK MILLIAMPERES
0
6.0 CABLE CAPACITANCE
MICROFARADS
0
60
START
TIMER
30
METER
CAPACITANCE
SCALE X10
PUSH TO READ
X1
μF
CAP
ZERO
mA
60
10
www.hvinc.com
Very Low Frequency AC Testers
AC testing of Cables, Motors &
Generators is now easier than ever.
Since the introduction of the High Voltage, Inc.
line of portable and affordable VLF hipots, there is a
HVI – The World’s VLF Source
Made in the USA
90 countries served since 1998
loads,
particularly
cables
and
rotating
machinery.
High Voltage, Inc. offers a full line of VLF AC Hipots
from 30 kVac to 200 kVac with models that can test up
• Greatest Model Selection
to 50 mF of load, cables over 50 miles in length and
• Highest Voltages Available
the largest of generators or motors. Use VLF for AC
• Highest Power Ratings Delivered
• Only VLF Thumper Produced
2
practical method of AC field testing highly capacitive
• Rugged oil filled non-electronic
design offers extreme reliability and ease of field service if ever necessary
• Latest solid state, computer
controlled wireless designs offered
Withstand stress tests and/or as a voltage source for
Tan Delta and Partial Discharge Diagnostic Testing.
HVI offers both its original, patented long proven oil filled
power supply models with analog controls and its all new
solid state, computer-micro controlled wireless design.
Both have diagnostic accessories available.
SINCE 1998, HVI has produced the most economical, rugged,
HVI offers more models and higher voltage models than any other vendor in the world. Models
range from 30 kVac – 200 kVac peak, offering
from 0.4 mF to 50 mF of load capability. Load ratings shown below are at the lowest frequency.
and reliable VLF products available. Our electro-mechanical
Original Patented Transformer Based Design
well over 2000 units in service worldwide. The HVI VLF design
control and our oil filled HV power supply designs are extremely
dependable, and if necessary, more easily field serviced than the
electronic designs. The HVI design has a proven record with
offers the best of everything, with manual, easy to use controls
VLF-30CM
0-30 kVac, 0.1 Hz, load rated to 0.4 mF
VLF-4022CM
0-44 kVac, 0.1 Hz - 0.02 Hz, load rated to 5.5 mF
but also sophisticated data collection. Electric utilities and
industrials have long recognized the benefit of our technology.
VLF-50CM
0-50 kVac, 0.1 Hz - 0.01 Hz, load rated to 50 mF
VLF-6022CM
0-62 kVac, 0.1 Hz - 0.02 Hz, load rated to 5.5 mF
VLF-65CMF
0-65 kVac, 0.1 Hz - 0.01 Hz, load rated to 22 mF
VLF-90CMF
0-90 kVac, 0.1 Hz - 0.02 Hz, load rated to 2.75 mF
HVI knows how to build long lasting field test equipment. HVI
now also offers the latest in solid state design VLF units that
VLF-12011CMF 0-120 kVac, 0.1 Hz - 0.01 Hz, load rated to 5.5 mF
offer many benefits, like automatic programmable control and
VLF-200CMF
0-200 kVac, 0.1 Hz - 0.02 Hz, load rated to 3.75 mF
wireless communications.
VT33
VLF: 0 - 33 kVac, 1.0 uF @ 0.1 Hz
Thumper: 0 - 13 kVdc @ 760 Joules
All HVI VLF designs produce a sine wave output that meets the
Solid State Computer Controlled Models
VLF-34E
0-34 kVac, 0.1 Hz - 0.01 Hz, load rated to 5.0 mF
VLF-65E
0-65 kVac, 0.1 Hz - 0.01 Hz load rated to 5.0 mF
The HVI VLF technology is protected
under U.S. Patent # 6,169,406
requirements of world standards, permitting it to be used as a
voltage source for Tan Delta and Partial Discharge diagnostic
testing. A sine wave producing VLF is required to perform these
tests. Keep all options open by choosing a sine wave design, like
the HVI VLF.
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?
• HVI Design - Portable, Affordable, Rugged, Reliable, & Long Proven
• HVI Support & Service – Best Customer Support, Ship from Stock, Instant Factory
Help
60
0
Quick Service Turn Around, Repair & Cal. Locations Worldwide, Reps in over 90 countries
What is VLF?
VLF stands for Very Low Frequency. A VLF hipot
is an AC output high voltage instrument. HVI VLF
products provide sinusoidal AC voltage but at 0.1
Hz - 0.01 Hz, compared to the 50/60 Hz output of
conventional AC test sets. It is still an AC voltage
with sinusoidal polarity reversals every half cycle.
The VLF instrument is used to provide a simple
go/no-go, or pass/fail, withstand test. Also, VLF
instruments can be used as the voltage source for
performing off-line Partial Discharge and Tan
Delta cable diagnostic testing, both from HVI.
Why VLF?
PEAK
KILOVOLTS
withstand several times normal AC voltage. IEEE 400,
400.2, & 433, VDE 0276, CENELEC HD 620/621,
SANA 10198, NEN 3620 and IEC 60502-2 standards
all define VLF testing.
VLF is also very useful for testing large rotating
machinery, since it provides a portable and affordable
method of field testing coils and is sanctioned by the
IEEE 433-2009 standard.
POS
NEG
Partial Discharge & Tan Delta
VLF Cable Diagnostic Testing
MILLIAMPERES
PEAK
OUTPUT The
VLF hipot
alone provides a withstand, or proof
test. It can also be used as the voltage source for off60diagnostic
0 capacitance line Partial Discharge and Tan Delta cable
VLF test sets are used to field test high
loads like cables and motors/generators. The lower
CAPACITANCE
testing.
HVI can serve the needs of the industry for
6.0 CABLE
0
the frequency of an AC source, the lower the cur-MICROFARADS
cable and generator testing better than any other.
rent and power required to apply a voltage to a ca- Contact HVI for additional information on other
START
pacitive load like a cable. At 0.1Hz, it requires 600 cable testing methods and products available.
TIMER
times less power to test a cable than at 60 Hz. The
HVI VLF instruments permit users to field test For more information on VLF testing, visit www.hvinc.com
long cables and large generators with a portable
Benefits of HVI VLF AC Hipots
and affordable test set. A 100 lb VLF instrument
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 done with a practical, • Waveform is independent of load capacitance economical, and easy to use package.
between 0.01 F and maximum load
CAPACITANCE
X10
When and Where Is VLF UsedSCALE
–
Cable & Rotating Machinery
The principal use of VLF is testing
and high
TO READ
PUSHmedium
X1
voltage shielded power cables. A long cable may have
many microfarads of capacitance. To AC high voltage
test this cable requires the use of VLF technology. An
AC voltage test is the best way to verify the AC integrity
of a cable. If a cable can’t hold 2 – 3 times normal
voltage, it is not healthy and an in-service failure is
likely. Use the VLF to cause defects to fail during the
test. Find the fault, make the repair or replacement,
and be left with a better cable. It is especially valuable
for verifying a cable after installation or repair: far
better than using a DC hipot, 5kV megohmmeter,
hot stick adaptor, or soak test, none of which provide
meaningful information about a cables ability to
• Highest load ratings available METER
• Highest voltage models available
μF
• Simple
and
easy
operation
CAP
ZEROdoes not degrade good
• AC testing
cable insulation
• Harmful space charges are not injected
into the cable insulation
• No traveling waves are generated
• BNC scope output for waveform viewing
• Rugged and reliable design less prone
to failure from transients
mA
3
5
30
60
10
Two Design Choices
Patented original, electro-mechanical, transformer designs and the
latest solid state computer controlled designs available from HVI.
VLF-30CM(F)
Best for testing 5 kV - 15 kV cables
Our smallest VLF model, the VLF-30CM 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, about 4000 feet (1200 m) of a typical 15 kV class
cable. Small, light, inexpensive, and easy to use. Now there's no reason not to use VLF.
Input:
Output:
Duty:
Load Rating:
Metering:
Quick & Simple
15 kV cable testing
Low Cost
Easy to Use
Small & Light
120 volts, 60 Hz, 5 A peak, 2.5 A average
or 230 volts, 50/60 Hz, 3 A peak, 2A average (F suffix)
0 – 30 kVac peak, 0.1 Hz, sinusoidal
Continuous
0.4 μF
Voltmeter: -30 kVac – 0 – +30 kVac
Charging Current meter: 0 – 50 mA peak
HV Cable Output: Shielded EPR output cable - 20 ft. (6 m)
15” w x 11.5” d x 22” h, 82 lbs. (88 lbs. - F version)
Size & Weight:
381 mm w x 292 mm d x 559 mm h, 39 kg
(42 kg - F version)
Two piece portability for field testing 25 kV & 35 kV cables
VLF-4022CM(F)
This model, with its 44 kVac peak output, is suitable for all testing of 25 kV cable and Maintenance
testing on 35 kV cable. Its high load capacity enables it to test up to approximately 10 miles of cable (at
.02 Hz), depending on type. This model includes a charging current and load capacitance meter, and a
center zero peak kilovolt output meter.
4
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, 2.2 μF @ 0.05 Hz, & 5.5 μF @ 0.02 Hz
Metering:
Voltmeter: Center Zero -45 – 0 – +45 kVac peak
Charging Current meter: 0 – 100 mA peak
Load capacitance meter: 0 – 6 Microfarads
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
Two-piece easy portability
HV Tank: 14.5” w x 10.5” d x 19” h, 72 lbs.
368 mm w x 267 mm d x 483 mm h, 33 kg
(see page 7)
VLF-6022CM(F)
Two piece portability for testing up to 35 kV cable systems - Wind Farms
This model, with its 62 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 (at .02 Hz), depending on type. This
model includes an enhanced features package: a charging current and load capacitance meter, test dwell
timer, and polarity indicating lights.
Network Systems &
Wind Farm Model
Two-piece easy portability
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:
0-62 kVac peak, 0.1 Hz - 0.02 Hz
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 – 65 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
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
All HVI VLF models are labeled and metered for peak voltage, not rms. When testing, use the peak voltage values given in your specification.
HIGH VOLTAGE, INC. 31 County Route 7A • Copake, NY 12516 • (518) 329-3275 • Fax: (518) 329-3271 • www.hvinc.com
VLF-50CMF
SCOPE
Highest mF rating available: 5 mF - 50 mF @ 0.1 Hz - 0.01 Hz
The VLF-50CMF is the highest power VLF unit we offer. It is rated for 5 mF at 0.1 Hz and can increase its output to 50 mF at 0.01
Hz, capable of testing up to 50 miles of 15 kV and 25 kV cable. It is ideal for very long cable runs, like long feeders, wind farm
applications, submarine cables, and others. It comes as pictured, including cable reels with 100’ of high voltage and ground cable.
60
0
Remove the wheels for van mounting.
Input: 230V +/-10%, 50/60 Hz, single phase, 30 A peak, 25 A avg.
Output: Sinusoidal 0 – 50 kVac peak, 0.1, .05, .02 and .01 Hz frequency
Simple installation – ready to go.
Duty:Continuous
PEAK
Test Capacitance: 5.0 mF @ .1 Hz, 10.0 mF @ .05 Hz, 25.0 mF @ .02 Hz, 50.0 mF @.01 Hz
KILOVOLTS
VLF-50CMF
Kilovoltmeter:
3.5 in., 0 – 60 kVac peak 2% FS Accuracy
Current Load:
3.5 in., 0 – 200 mAac peak 5% FS Accuracy
Capacitance Meter: 0 – 6 mF with x1 & x10 ranges
Sizes:
Controls: 17” w x 11” d x 9.5” h, 20 lbs.
432 mm w x 280 mm d x 241 mm h, 9 kg
Power Section: 20” w x 14” d x 27” h, 160 lbs.
508 mm w x 356 mm d x 686 mm h, 73 kg
HV Tank size: 13.5” w x 19” d x 23” h, 310 lbs.
343 mm w x 483 mm d x 584 mm h, 141 kg
Complete Trolley:28” w x 60” d x 51” h, 775lbs
711 mm w x 1524 mm d x 1295 mm h, 352 kg
Output cable
length: Shielded X-Ray/Ground on reels - 100 ft. (30 m)
VLF-65CMF
NEG
Ideal for long 35 kV cable runs at Wind Farms
OUTPUT PEAK MILLIAMPERES
The VLF-65CMF, 65 kV peak output, is a higher power model designed to
test very long cables rated up to 35kV. It offers the complete controls package
including Cable Burn mode. Its cable reels provide 100’ (30m) of HV and ground
0
VLF-65CMF
Wind Farm
CABLE CAPACITANCE
Input: 230 V, 50/60 Hz, 30A peak, 25A average
Output: 0 – 65 kVac peak, 0.1/0.05/0.02/0.01 Hz MICROFARADS
sinusoidal
Model
Duty:Continuous
Load Rating: 2.2 mF @ 0.1 Hz, 4.4mF @ 0.05 Hz
11 mF @ 0.02 Hz & 22 mF @ 0.01 Hz
Metering:
Voltmeter: 0-75 kVac peak
Charging Current Meter: 0 – 200 mA peak
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.
432 mm w x 280 mm d x 241 mm h, 9 kg
Regulator: 20” w x 14” d x 27” h, 160 lbs.
508 mm w x 356 mm d x 686 mm h, 73 kg
HV Tank: 15” w x 18” d x 22” h, 215 lbs.
381 mm w x 457 mm d x 559 mm h, 98 kg
Overall: 30” wCAPACITANCE
x 60” d x 51” h, 704 lbs.
on Skid. 762 mm w x 1524 mm d x 1295 mm h, 320 kg
6.0
SCALE X10
VLF-90CMF
POS
μF
90 kVac voltage output yet still portable
CAP
READ
PUSH
The VLF-90CMF offers 90kVac peak
outputTO
voltage,
suitable for testing
ZERO
m
F
@
0.1
Hz,
capable
of
testcables rated 45 – 50kV. It is load rated for 0.55
X1
ing up to 2 miles of cable, five times that at 0.02 Hz. Pictured with optional
hand truck.
Input: 230 V, 50/60 Hz, 20A peak, 15A average
Output: 0 - 90 kVac peak, 0.1/0.05/0.02 Hz sinusoidal
Duty:Continuous
Load: .55 mF @ 0.1 Hz, 1.1 mF @ 0.05 Hz, 2.75 uF @ 0.02 Hz
Metering:
Voltmeter: 0 – 100 kVac peak
Current Meter: 0 – 100 mA peak
Load capacitance: 0 – 6 microfarads
User programmable test duration timer
Cable Lengths:
Shielded EPR output cable – 20 ft. (6m)
Interconnect cable - 10 ft. (3m)
Sizes & Weights: Controls: 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.
381 mm w x 533 mm d x 737 mm h, 133 kg
0
60 Remove
wheels
for van
mounting
5
30
VLF-90CMF
METER
mA
60
VLF-90CMF
Only portable
unit at 90 kV
Hand cart
is optional.
10
VLF-12011CMF 69 kV Cable Withstand & 115 kV Cable Diagnostics
The VLF-12011CMF provides a 120kVac peak output voltage, suitable for VLF
hipot testing 69 kV cable and as a voltage source for partial discharge and tan
delta testing of 115 kV cable. In addition to the standard controls described, this
model also contains a Cable Burn mode. Cable reels provide 100’ (30m) of HV
and ground cable.
One piece with casters,
truck mounting blocks, skid,
or separate components.
Input: 230 volts, 50/60 Hz, 30 A peak, 25 A average
Output: 0 – 120 kVac peak, 0.1/0.05/0.02/0.01 Hz sinusoidal
Duty:
Continuous
Load Rating: .55 mF @ 0.1 Hz, 1.1 mF @ 0.05 Hz
2.75 mF @ 0.02 Hz, 5.5 mF @ 0.01 Hz
Metering:
Voltmeter: 0 – 120 kVac peak
Charging Current Meter: 0 – 100 mA peak
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.
432 mm w x 280 mm d x 241 mm h, 9 kg
Regulator: 20” w x 14” d x 27” h, 160 lbs.
508 mm w x 356 mm d x 686 mm h, 73 kg
HV Tank: 26” w x 20” d x 22” h, 390 lbs.
660 mm w x 508 mm d x 559 mm h, 177 kg
Overall:
30” w x 60” d x 51” h, 853 lbs.
762 mm w x 1524 mm d x 1295 mm h, 388 kg
VLF-200CMF
200 kVac
Highest voltage rating available
The VLF-200CMF provides a 200 kVac peak output voltage, suitable for performing VLF hipot tests on 138 kV cable and as a voltage source for tan delta and
partial discharge testing on 230 kV cable. The controls offer all the features of
our other VLF models along with VLF Cable Burning. Trailer mount optional.
Input:
230 V Single phase, 80 A peak, 50/60Hz
Output:
0 – 200 kVac peak, 100 mA. Bushing output – no cable provided
Load: .75 mF @ 0.1 Hz, 1.5 mF @ 0.05 Hz, 3.75 mF @ 0.02 Hz
Duty:Continuous
Metering:
Voltage: 0 – 200 kVac peak 3.5” analog display
Current: 0 – 200 mAac 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, 650 lbs.
610 mm h x 648 mm w x 1803 mm h, 295 kg
HV Tank: 59” w x 37” d x 87” h, 3700 lbs
1499 cm w x 2362 mm d x 2210 mm h, 1678 kg
6
The Testing
Service &
Electrical
Contractor
Model
VLF Thumper
VLF: 33 kV @ 0.1 Hz @ 1 mF
Thumper: 13 kV @ 760 joules
Burner: Alt. polarity discharge
TDR/Radar: Ready to go.
VT33(F)
VLF & Fault Locator Combo
2 tools in 1 box
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 33 kVac peak VLF output, VLF Cable Burn
mode, and a 760 joule discharge output. It is fully TDR/radar ready.
Input:
VT33: 120 V, 60 Hz, 10 A
VT33F: 230 V, 50/60 Hz, 5 A
VLF Hipot Output: 0 – 33 kVac peak @ 0.1 Hz
Load Capability:1 µF – more than 1 mile (1.6 km) of 15 kV & 25 kV cable
Discharge Output: 0 – 13 kVdc @ 760 joules
Discharge Rate: Every 8 seconds
VLF Burner:
Arcs cable every few seconds using cable energy to burn.
TDR Interface:
Arc Reflection & Current Impulse
Size & Weight:
28” w x 26”d x 44” h, 245 lbs.
711 mm w x 660 mm d x 1118 mm h, 111 kg
Cable Outputs:
50’ (15 m) shielded HV cable & ground
HIGH VOLTAGE, INC. 31 County Route 7A • Copake, NY 12516 • (518) 329-3275 • Fax: (518) 329-3271 • www.hvinc.com
The “E” Series VLF Models SCOPE
Solid State Design - Fully Automated w/PC App - Wireless
The “E” Series of VLF products offer the latest in electronic design, with fully automated and programmable operation, data collection and reporting, and Tan Delta ready, all wirelessly controlled via custom software. There is no
better VLF available. The two models shown below each have an optional HVI designed Tan Delta measurement
accessory and Partial Discharge detection0options are available from HVI and from others.
60
VLF-34E
“E” Series Front Panel
PEAK
KILOVOLTS
VLF-65E
POS
NEG
0 – 34 kVac peak, Sinusoidal
0.5 mF – 5.0 mF, 0.1 Hz – 0.01 Hz
0 – 65 kVac peak, Sinusoidal
1.0 uF – 10.0 uF, 0.1 Hz – 0.01 Hz
Refer to the separate VLF-34E & VLF-65E brochures for details
Typical Front Panel Controls HVI Founder & Inventor
Electro-Mechanical
Designed
Models
MILLIAMPERES
OUTPUT PEAK
0
Stanley G. Peschel (1930 – 2002)
Data Logger Option
6.0 CABLE CAPACITANCE
MICROFARADS
0
60
7
Plug into VLF panel
Wireless to laptop
30
With reporting software
Holding the first portable & affordable
VLF – 1998. A 40 kVac model.
A breakthrough in VLF technology.
Cable Diagnostic Testing Accessories
for all HVI VLF Models
CAPACITANCE
METER
60
X10 VLF Tan Delta and VLF Partial Discharge diagnostic testing
SCALE
HVI offers the accessories used for
performing
μF
mAsome are
for cables and rotating machinery. Some of the models offered are designed and produced by HVI and
CAP Other vendors also offer these accessories
READ
TOwith
from other vendors, designed toPUSH
function
the HVI VLF products.
ZERO
X1 Models are available
that may be used with the HVI VLF designs.
up to 200 kV peak. Consult HVI for more
details and refer to separate literature for each item.
Tangent Delta (δ) or Loss Angle Measurement
Partial Discharge Detection and Location
& Tan Delta Measurement
TDB-60
60 kVac peak
(since 1999)
TD-34E
34 kVac peak
TD-65E
65 kVac peak
Shown is PDIX-70, 70 kV peak
models to 200 kV available
10
Wind Farm 35kV Cables are SCOPE
Ideal for VLF Withstand Testing
Application Help and Field Test Scenes
Selecting a VLF Model
Considerations when selecting the right model: voltage, mF rating, mF rating at 0.1Hz, & control features.
Voltage: What is the cable voltage rating and what tests will be performed? Table from IEEE 400.2-2013.
0
Cable Rating
Installation
Acceptance
Maintenance
phase to phase
phase to ground
phase to ground
phase to ground
kVrms
VLF Acceptance Test
per IEEE 400.2-2013
All 3 phases
@ 62 kVac
for 60 minutes
60
PEAK
KILOVOLTS
kVrms (kVpk)
kVrms (kVpk)
kVrms (kVpk)
5
9 (13)
10 (14)
7 (10)
8
11 (16)
13 (18)
10 (14)
15
19 (27)
21 (30)
16 (22)
25
29 (41)
32 (45)
24 (34)
35
39 (55)
44 (62)
33 (47)
46
51 (72)
57 (81)
43 (61)
69
75 (106)
84 (119)
63 (89)
POS
Cable system is newly installed needing a VLF Withstand
to find defects and faulty workmanship. Find the bad spots.
NEG
μF Rating: VLF hipots are rated by the capacitance of the loads they
can test. To select the right model, either the load capacitance must be
known or the cable length if the mF/km, mF/ft, etc. is known.
μF Rating at 0.1 Hz: If the VLF is to be used as a voltage source for
performing Tan Delta and Partial Discharge testing, the load rating at
0.1 Hz is important, as this is the frequency most used for these tests.
In some cases, 0.05 Hz frequency can be used. If the VLF is to be used
for hipoting, then any frequency can be used.
Control Features: Are the
automated, laptop controlled, etc. features of the “E” Series necessary
or are the basic manual controls of our original design adequate, saving money and gaining other benefits?
Comment: A fifth consideration could
be the vendor? Where it is made and serviced, how available is it, how quick is
the service turnaround, and what is the
START
vendors reputation. All HVI products are
MadeTIMER
in the USA and most are in stock.
OUTPUT PEAK MILLIAMPERES
0
60
200 kV VLF van in service, high voltage out thru top.
6.0 CABLE CAPACITANCE VLF0Options Available
MICROFARADS
Hand Truck
Option
for some
models
Other Cable Test & Fault Locating Products
VLF Cable Testing & Fault Locating
Van Ready Custom Packages
Instant & easy test van: HVI can mix and
match products to deliver a custom made
module to handle all your test and fault locating needs. Just drop it in your truck.
Can Include
Ω-CHECK® Concentric Neutral
Resistance Tester & Substation
Ground Cable Integrity Check
PUSH TO READ
X1
Cable
Reels
How good are
your neutrals?
METER
CAPACITANCE
SCALE X10
• VLF Hipot
• Tan Delta
• Data Logger
• Thumper
• TDR/Radar
• UG Fault Finder
• Cable Reels
• DC Hipot
• and more
30
μF
CAP
ZERO
mA
60
HV output cable attachments
10
fault location
TDR/Radar display
All HVI Products are
Made in the USA
ISO 9001: 2008
VLF 8-PAGE / DEC 2014
www.hvinc.com
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