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onsitehv technologyag, located in Switzerland, is an
international Company oering innovative test and
diagnostic tools or the electrical energy branch.
onsitehv technology is a reliable partner or utilities,
power suppliers and grid operators as well as producers
o equipment or electrical grids. Our multiunctional
on-site test and diagnostic technology oers solutions
or an appropriate assessment o medium and
high-voltage grid components. Thus, our technology
is capable o supporting grid operators as well as
asset management in operating their components
reliably and sustainably.
In the area of modern energy grid operation,
onsite hv technology is the new brand or valuable
products, intelligent solutions and comortable and
easy-to-apply technology.
Our innovative products and services are state of
the art. This is a clear advantage over our competitors
and gives our customers certainty and trust in our
abilitiesThomas Strehl, CEO onsitehv technology ag
onsitehv solutionsag, orming part o the onsite
hv group, oers services in testing, measuring and
diagnosing grid components or the electrical energy
grid. onsitehv solutionsag operates successully
on an international level, distinguishing itsel rom
competitors by a unique combination o highly
qualied specialists, scientically based know-how
and long-standing experience in the eld as well as
in the laboratory.
Thorough scientific knowledge combined with long-
standing practical experience in grid measurement
and laboratory investigation this is how we have
created the prerequisites for innovative technology
and applications.
Pro.Dr.hab. ir Edward Gulski, President Board o Directors
o onsite hv technology ag and CEO oonsitehv solutions ag
onsitehv technology
the New Brand or the Electrical Energy Industry
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Standards/norms/guide Description
IEC 60060-3 High voltage test techniques Part 3:
Denitions and requirements or
onsite testing.
IEEE 400 Guide for eld-testing and evaluation
o the insulation o shielded power
cable systems rated 5 kV and above.
HD 632 S2 Power cables with extruded insulation
(CENELEC) and their accessories or rated voltages
above 36kV (Um=42kV) up to 150kV
(Um= 170kV).
IEC 60840 Power cables with extruded insulation
and the accessories or rated voltages
above 30kV up to 150kV Test methods
and requirements.
IEC 62067: Power cables with extruded insulation
and the accessories or rated voltages
above 150kV.
IEEE 400.4: Guide for eld-testing of shielded power
cable systems rated 5 kV and above with
Damped Alternating Current voltage
(DAC) (drat under preparation).
IEEE 400.3: Guide for PD testing of shielded power
cable systems in a eld environment.
IEC 60270: Partial discharges measurements.
IEC 60885-3: Test methods for partial discharges
measurements on lengths o extruded
power cable.
IEC 60141: Tests on oil-lled and gas-pressure
cables and their accessories.
IEEE 1425: Guide for the evaluating of the remaining
lie o impregnated paper-insulated
Transmission Cables Systems.
CIGRE Technical High voltage Onsite testing with partial
Brochure 502: discharge measurement, June 2012
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Ater-laying or commissioning testing o newly installed
or repaired (E)HV cable systems is fundamental for
reliable cable system operation. Poor installation or
ailures due to inappropriate laying procedures should
be detected and identied beore applying power.
Our products for cable system operators include:
Ater-laying tests with test voltages refecting
operational conditons and used to turn relevant
dangerous ailures to electrical treeing (PD inception)
and then bring them to breakdown during the test
like DAC does - are key to reliable service ater
installation or repair.
Simple Withstand tests, however, always include
a certain risk o not bringing identied (PD-incepted)
ailures to breakdown during test Time. The optimum
is surely to combine the withstand test with sensitive,
standardized PD measurement. DAC is especially
developed to perorm such a PD measurement
during the withstand test reliable and sensitive.
Service-aged cables on the other hand require a
different assessment: Users want to know if aging
in service has created an unacceptable risk o
breaking down or they simply want to know
which o the old cables they should replace rst.
DAC is capable o assessing cable-aging-status
in comparison with other cables based onpartial discharge diagnosis and dissipation
actor estimation.
On-site DAC voltage test in combination with non
destructive PD and dissipation actor measurements
is exactly the method or reliable testing o newly
installed, repaired or service-aged cable systems.
Application o damped AC to test and diagnosis
For onsite testing the DAC voltage is generated by
energizing the capacitive test object (cable) to the
preselected test voltage by an HV source within a
couple o seconds. When the test voltage is reached,
an HV switch closes providing an LC resonance
circuit o the cable capacitance and the system
inductance. This provides a damped sinusoidal AC
voltage with low damping. Depending on the capa-
citance o the test object the AC requency varies in
the range from 20 to a few hundreds of Hz.
During the DAC voltage test at the selected test
voltage level, a designated number o DAC excitations
is applied to the test object, and simultaneous partial
discharges and the dissipation actor are measured.
Since the DAC requency o the test voltage is close
to nominal AC service conditions, all AC voltage
stresses and measured PD activities can be eectively
evaluated and are comparable with the service
conditions under power requency. In case o harm-
ul insulation deects, a breakdown may occur in
the test object. In addition the PD inception voltage
(PDIV) and PD extinction voltage (PDEV) are measured.
The dissipation actor can be easily determined due
to the decaying amplitude o the test voltage.
Operating at test voltage levels (in accordance withrelevant IEC, IEEE and CIGRE standards and guidelines),
DAC can determine whether the entire cable system
insulation is sound (deect-ree and non-aged) and
whether it can withstand a higher voltage stress
level. DAC will not harm healthy (deect-ree) cable
insulations during the test.
On-site Testing and Diagnostic Measurement of MV and HV Power Cables
using Damped AC (DAC)-Testing Technology
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Cable monitoring: PD and tan dAnother unique advantage o DAC is the built-in
combination with Partial Discharge (PD) measurement
and Loss Factor estimation (tan d).
The PD measurement gives users the certainty to see
nearly all PD inceptions during test voltage application.
As a result, it allows to turn o the test i PD appears
and avoid a breakdown during the test i not appropriate
(cable under specic surveillance will be exchanged
or repaired soon). Additionally, localization and
identication o PD patterns (e.g. joints) is possible. All
PD measurements are according to IEC standard(s) and
have been proven by experience over the last 13 years.
The Dissipation Factor (tan d) estimation is based on
the determination o the damping actor o the DAC
voltage itsel. This measurement ater extensive labo-
ratory and eld experiences gives a reliable indication
o the integral deterioration o the cable insulation.
Especially oil lled gas pressure cables (e.g. 220 kV)
aged for more than 40 years can be differentiated into
groups o highly and acceptably aged ones. In case
o investments or exchange programs this method
supports the decision which cable has to be exchanged
frst on the best available bases OWTS HV technology
for all types of (E)HV cables with lengths of up to 40 km!
How to apply DAC on (E) HV cable systems:This method provides system operators with a light-
weight, small and easy to apply technology. All parts
o the test equipment can easily be covered with
ght cases and t into a small van (e.g. for 220 kV).
The application takes approx 6 to 8 hours:
1. OWTS HV system assembly on site (1 hour)
2. Connection o all parts and checking o system
(0,5 hours)
3. Testing and measurement o all three phases
of a system (3 hours)
4. Analysis o the measuring results - disconnection
and packing of test system into boxes (1 hour)
Main advantages:
Low energy consumption on site small ootprint
or test equipment
Only two engineers are needed to provide a ull
measurement.
Cable system shut-down time will be minimized
to 4 to 5 hours.
Results o non-destructive and sensitive PD testing
and tan delta are available on the same day.
This approved testing methodology is in accordance
with relevant international standards and
recommendations (IEEE, IEC, CIGRE).
On-site Testing and Diagnosis of (E)HV Power Cables Using OWTS HV Technology
Specifcations OWTS HV systems
*1)Higher values available on request *2) Other voltages on request All specications subject to change without notice.
OWTS HV20
190 kV peak / 134 kV rms
approx. 5.5 Happrox. 75 Ohm
20 Hz / 350 Hz
0,035 F 8 F
20 mA *1)
approx. 600 kg
approx. 950 kg
-5 C ... 50 C non condensing
3 phase 350-450V 48-63Hz 4500VA *2)
1 pC 100 nC
acc. to IEC 60270
150 kHz 20 MHz , wide rangeautomatic bandwidth adaptation
or short and long cables
Integrated0.1 % ... 5.0%
Max. output voltage
Coil inductance Coil resistance Frequency range damped ac Test object capacitance range HV charging current
Weight without transport case Weight with transport case Operating temperature
Power supply PD measuring range PD measurement bandwidth PD location bandwidth
TDR joint location in calibration mode Dielectric losses range
OWTS HV30
270 kV peak / 191 kV rms
approx. 5.5 Happrox. 75 Ohm
20 Hz / 350 Hz
0,035 F 8 F
12 mA *1)
approx. 650 kg
approx. 1050 kg
-5 C ... 50 C non condensing
3 phase 350-450V 48-63Hz 4500VA *2)
1 pC 100 nC
acc. to IEC 60270
150 kHz 20 MHz , wide rangeautomatic bandwidth adaptation
or short and long cables
Integrated0.1 % ... 5.0%
OWTS HV40 (on project base)
400 kV peak / 283 kV rms
approx. 7.6 Happrox. 85 Ohm
20 Hz / 350 Hz
0,025 F 8 F
7 mA *1)
approx. 1300 kg
approx. 1700 kg
-5 C ... 50 C non condensing
3 phase 350-450V 48-63Hz 4500VA *2)
1 pC 100 nC
acc. to IEC 60270
150 kHz 20 MHz , wide rangeautomatic bandwidth adaptation
or short and long cables
Integrated0.1 % ... 5.0%
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On-site Testing and Diagnostic Measurement or
MV Power Cables using Damped AC (DAC)-Testing Technology
On-site testing and diagnosis o medium-voltage pow-
er cables with DAC technology is principally based
on the same advantages as (E) HV cable systems.
Ater-laying testing o newly installed, repaired or
service-aged MV cable systems with reliable results
and an appropriate assessment o the condition o
the cable insulation as well as o the accessories is key
to successul operation o the distribution networks.
DAC voltage test and diagnostic measurements (PD
and tan d) provide or reliable detection o poor ins-
tallation, ailures due to inappropriate laying, ailu-
res in accessories or deterioration in cable insulation
due to aging. It allows much more than a simple go
or no-go decision. DAC testing is an advanced main-
tenance tool which supports asset management and
grid operation as well.
Sound withstand test method with test voltages
representing operational stresses.
Sensitive PD measurement and location in complete
cable systems (insulation and accessories).
Assesment o cable aging status in comparison with
other cables based on dissipation actor (tan d)
estimation.
On-site DAC voltage test in combination with non
destructive PD and Loss Factor measurement is unique
and undamental or reliable service o newly installed,
repaired or service-aged cable systems.
How does DAC or MV cable system work?
Essentially, it is based on the same procedure as the
testing o high-voltage cables however, the test
system itsel is even smaller and lighter and an
all-in-one device. This results in a aster and easier
test procedure or MV cable systems with the same
degree o assessment o the tested cables.
Specifcations OWTS MV systems
All specications subject to change without notice.
OWTS MV10
30 kV peak / 21.2 kV rms
approx. 1.0 H
approx. 20 Ohm
50 Hz / 550 Hz
0.08 F 4 F
12 mA
LTT
approx. 75 kg
-5 C ... 50 C non condensing
1 phase 94-250V 48-63Hz 500VA
Celeron M, XPE, 2 GB Flash-Disc
1024 MB
Integrated 100MHz DAQ, 8 bits
Automatic / Manual
1 pC 100 nC
acc. to IEC 60270
150 kHz 20 MHz, wide range automatic band-width adaptation or short and long cables
Integrated
0.1 % ... 5.0%
WLAN 802.11g
Remote client (Notebook)
OWTS Diagnostic Suite: comprehensive viewing, proces-sing, analysis and reporting o OWTS measurement data
Max. output voltage
Coil inductance
Coil resistance
Frequency range damped ac
Test object capacitance range
HV charging current
HV Switch
Weight without transport case
Operating temperature
Power Supply
Calibration mode
PD measuring range
PD measurement bandwidth
PD location bandwidth
TDR joint location in calibration mode
Dielectric losses range
Operation control
User interface
OWTS MV20
60 kV peak / 42.4 kV rms
approx. 2.5 H
approx. 32 Ohm
50 Hz / 550 Hz
0.035 F 4 F
6 mA
LTT
approx. 90 kg
-5 C ... 50 C non condensing
1 phase 94-250V 48-63Hz 500VA
Celeron M, XPE, 2 GB Flash-Disc
1024 MB
Integrated 100MHz DAQ, 8 bits
Automatic / Manual
1 pC 100 nC
acc. to IEC 60270
150 kHz 20 MHz, wide range automaticwidth adaptation or short and long cables
Integrated
0.1 % ... 5.0%
WLAN 802.11g
Remote client (Notebook)
OWTS Diagnostic Suite: comprehensive viewing, proces-sing, analysis and reporting o OWTS measurement data
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A diagnostic tool or on-site diagnosis o power
transormers with on-load tap changer
The Transormer Diagnostic System is developed or
testing power transormers with an on-load tap
changer. The transormer diagnostic system is suitable
or pre-ailure detection o major degradation
mechanisms and deects o dierent types o on-load
tap changers. Winding deects can also be ound with
this diagnostic system.
The TDS146 is used or:
Monitoring the contact condition: Condition-based
maintenance requires diagnostic measurements to
determine when and what kind o maintenance is
necessary.
Diagnoses o the power transormer windings and
OLTC in case protective devices have switched
o the transormer.
Measurements ater tap changer maintenance
or repair:
Pre-ailure detection o maintenance errors
Finding deects that remained undiscovered
during inspection (or example contact
misalignment).
Measuring OLTC contact degradation and
winding deects inside the transormer
tank which are not visible during inspection.
Detection o deects:
The TDS146 checks the main functionality of the tap
changer and is able to nd such as:
Contact deterioration o
(for example due to coking or overheating):
Selector switch contacts
Diverter switch contacts
Tap-selector contacts
Change-over selector contacts
Reversing switch contacts
Coarse change-over selector contacts
Fixed-connection contacts
Interrupted or damaged transition resistors
Mechanical riction in motor drive and transmission
Broken or weakened springs
Winding damage
Maintenance errors
Saety contactor or switching time protection
Weak or damaged drive axis
Synchronization problems between phases
On-site Diagnosis of Power Transformers with On-Load Tap Changer Using
Transformer Diagnostic System TDS 146
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Main unctionality o the TDS146:
Tap changer:
Dynamic resistance measurement (DRM)
Check contactor or switching time control
(i equipped)
Position measurement on the OLTC drive axis (or
rotor-type OLTCs with accessible drive axis)
Motor power measurement on the OLTC drive
mechanism
Transormer windings:
Transormer turn ratio measurement
DC winding resistance measurement
Relevant standards and recommendations:
ANSI/IEEE C57.12.90-1987: American national
standard / IEEE Standard TestCode for Liquid-
Immersed Distribution, Power and Regulating
Transormers.
IEEE Std 62-1995: IEEE Guide for Diagnostic Field
Testing of Electric Power Apparatus. Part 1: Oil
Filled Power Transormers, Regulators and Reactors.
IEEE Std C57.12.37-2006: IEEE Standard for the
Electronic Reporting o Distribution Transormer
Test Data.
IEEE Std C57.140-2006: IEEE Guide for the Evalua-
tion and Reconditioning o Liquid Immersed Power
Transormers.
IEC 60214: Tap-changers - Performance require-
ments, test methods and application guide.
IEC 60076-1: Power Transformers - Part 1: General
Technical details TDS146
Resistance tests Voltage: 0-15VDC
(winding resistance Current: max 10ADC
and dynamic OLTC) Range: 100m-100
Accuracy: 1m static
5m dynamic
Measurement of the Test voltage: 20VAC
transformer turn ratio Range: 1:1 to 1:100
Accuracy: Ratio 0.1%,
current 1mA, phase angle 0.5
Magnetizing current:
Range: 0-300mA, 50/60Hz
Accuracy:1mA
Phase angle: 0.5
Transormer connection Auto-conguration by
relays-matrix
Operating temperature
range 0C to 50C
Communication with Wireless IEEE 802.11g
control notebook
Supply voltage 100-250VAC, 50/60Hz
Weight Approximately 12 kg
(without cabling)
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Generator Transormer Cable GIS
Central Control System and User Terminal
PDU-H
PDMS 100
PDU-V
PDMS 100
PDU-V
PDMS 100
PDU-V
PDMS 100
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Application o on-line PD monitoring
Partial discharges are symptoms o insulation deects
in all types o medium-voltage and high-voltage
components. Depending on the type o a particular
deect as well as the PD inception conditions, the
occurrence o discharging deects during network
operation may enhance the risk o a component
failure. The PDMS 100 detects and monitors partial
discharge signals during network operation o power
transormers, generators, GIS and power cables.
The PDMS 100 system provides:
Non-destructive partial discharge detection during
network operation
Registration o relevant PD quantities
Remote assessment of up to 250 PDMS 100 units
Periodic data registration and data storage
Automatic PD pattern classication
Possibility o alarm setting coniguration or each
measuring channel
The PDMS 100 is an economical solution for mo-
nitoring power transormers and cable networks. It
utilizes state of the art UHF partial discharge (PD)
detection technology. The system can easily be
installed on new transormers or retrotted on
transormers in service with a short outage time.The PD Simply Detector has six available PD mea-
surement channels with an available requency
bandwidth of 50MHz-800MHz. The recommended
PDMS UHF sensors for this application have a band-
width of 30MHZ to 1300MHz.
PD input
On-Line Partial Discharge Monitoring System PDMS 100
Metalic BNC 3
Multiplexing NA
Simultaneous PD
measurement 3
Input coupling AC
DC blocking capacitor
voltage rating 100V
Input impedance 500hm
Max input voltage 10V rms
3dB input frequency
High 900MHz
Low 100kHz
30MHz LPF 300MHzHPF 150MHz HPF
Filters 50MHz HPF
ADC resolution 12bit
ADC speed 105MSps
Max gain for ADC 60dB
Gain step 5dB
Down converter Yes
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Switzerland
Brnigstrasse 25
6055 Alpnach
Switzerland
Phone: +41 41 500 0550
Fax: +41 41 500 0551
China
Sheng Li Industrial Park North o
Chao Tian Industrial Zone Shi Lian Lu
Shi Lou Town
Panyu District
Guangzhou P.R.China
post code: 511447
Phone: +86 20 3485 2688
Fax: +86 20 3485 2066
Taiwan
No. 5, Alley 2, Lane 261
Yen-Ping Road, Sec 1
Hsinchu City 300
Taiwan
Phone: +886 3 5218 218
Fax: +886 3 5250 655
Canada
23 Cardico Drive
Unit 2 Gormley,
Ontario, L0H 1G0
Canada
Phone: +01 (905) 888-7770
Fax: + 01 (905) 888-7772
Germany
Zum Brook 19-21
D 49661 Cloppenburg
Germany
Phone: +49 4471 94940
Fax: +49 447184895
The Netherlands
Van der Kunstraat 10
4251 LN Werkendam
The Netherlands
Phone: +31 183 304 831
Fax: +31 183 302 008
www.onsitehv.com
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copyright by onsite hv technology ag, Switzerland
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onsitehv technology ag
Brnigstrasse 25
6055 Alpnach
Switzerland
Phone: +41 41 500 5120
Fax: +41 41 500 0551
www.onsitehv.com