onsite hv technology 2012

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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



20 Hz / 350 Hz

0,035 F 8 F

12 mA *1)

approx. 650 kg

approx. 1050 kg


3 phase 350-450V 48-63Hz 4500VA *2)

1 pC 100 nC

acc. to IEC 60270




OWTS HV40 (on project base)



20 Hz / 350 Hz

0,025 F 8 F

7 mA *1)

approx. 1300 kg

approx. 1700 kg


3 phase 350-450V 48-63Hz 4500VA *2)

1 pC 100 nC

acc. to IEC 60270





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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


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


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

[email protected]

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

[email protected]

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

[email protected]

www.onsitehv.com

onsite hv technology 2012

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