DTL C

Oil tan delta and resistivity tester

Insulating oil testing with BAUR DTL C
 
The thorough analysis and diagnostics of insulating oils with BAUR DTL C provides valuable findings for scientific and technical work, research and development. Comprehensive knowledge on the current condition of insulating materials is also becoming increasingly important for practitioners in mains operation.
BAUR DTL C offers the most precise information currently available for efficient oil management in plants in the electricity and industry sectors.
 

  • Fully automatic dissipation factor measurement
  • Preprogrammed standards
  • Maximum precision



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We at BAUR can calibrate this product accredited according to ISO/IEC 17025.

   

Insulating oil testing with BAUR

   

Change insulating oils as required, not based on set intervals

   

Seamless functioning of transformers as well as oil-insulated switches or converters largely relies on the condition of the insulating oil. It is therefore important to avoid obsolescence due to oxidation, heat stress or impurities and to change the oil early enough. At the same time, you can benefit from extending the replacement intervals, particularly for transformers with their large volumes of oil, thereby reducing costs. To do this without endangering people or the material, you first need to check the quality of the oil – using the BAUR DTL-C oil tester, for example. With 3 measurement functions combined in one device, this tester is used in labs around the word.

    

Test insulating oil with BAUR

   

The DTL-C tester quickly and reliably delivers key results on the condition of the insulating oil, which you need to change the oil as required. It is suitable for testing mineral oil-based oils, natural oils as well as synthetic esters. The results can be used to determine whether one insulating oil is compatible with another. Thanks to the measurements, you can therefore unite safe operation and low maintenance costs without jeopardising the function or service life of your equipment. 

   

Advantages to the DTL-C insulation measuring device

   

1 device - 3 measurements

   

The BAUR DTL-C tester combines several key functions for insulating oil testing. Using just one device, you can

  • determine the dissipation factor (tan δ),
  • measure the specific resistance and
  • determine the relative permittivity. 

The results from all three measurements can then be used to detect any vulnerabilities in the insulating oil more reliably than if only one or two of the measurement methods were used. The DTL-C tester is therefore ideal for taking precise measurements of the tan δ from 4.0 to 1 x 10-6, the specific resistance with both polarities up to 100 TΩm and the relative permittivity εr from 1 to 30.

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Quick onboarding

    

In order to make sure experienced staff and new employees alike are able to get to grips with oil testing as quickly as possible, BAUR offers a number of educational options:

    

Training courses (available on request) Training courses (available on request)
User manuals User manuals
Operator videos Operator videos

Quick and easy operation

   

The measurement sequence and evaluation don’t take very long as the DTL-C tester does the work for you. Your team can concentrate on the oil extraction while you receive reliable measured values shortly after.


With predefined measurement sequences for a total of 14 international standards and 10 freely programmable test sequences, standardised testing is easier to conduct than ever. The internal induction heating ensures equal temperature distribution throughout the measurements, thereby minimising potential measurement deviations. The efficiency of the analysis system is further increased by the fully automatic calibration of the empty cell . This enables quick analyses without manual intervention, saving valuable time. In addition, automated cell emptying helps to ensure the measurement results remain unbiased. The convenient evaluation of the collected data is made possible by the BAUR Software ITS Lite .

Individual reporting 

    

The BAUR software ITS Lite is available for the automatic reading of measurement logs from BAUR oil testers, the archiving of measurement logs in PDF format or as a text file on the PC, automatic printing of measurement logs on the PC or the individual design of measurement logs. Use the ITS Lite software to process measurement data from several oil testers from one computer. 

ITS Lite is available to download free of charge on BAUR web.

   

The external USB interface for oil testers BAUR Report Manager is used to automatically export measurement logs from BAUR oil testers to a USB drive. Extensive language support and the integration of individual logos make it possible to generate professional reports.

   

Whether you use the Report Manager or ITS Lite – in both cases you can easily transfer the results and view, analyse, compare or archive them in the office.

About ITS Lite software About ITS Lite software
About Report Manager About Report Manager

Why should you test the insulating oil in the transformer?

    

The condition of the insulating oil may deteriorate due to a number of reasons, some of which may occur simultaneously. 

   

 Reason for ageing  Potential impact
 Oxidation  Contamination due to particles
 Moisture  Reduction in dielectric strength
 Overheating

 Loss of viscosity and resulting

  • limited movement
  • limited temperature recording
  • higher equipment temperature
  • Overheating
  • Malfunction
 Sparks and flashovers  Gas formation
 Partial discharge  Silt development
 Chemical impurity  Higher dielectric losses


Taking oil samples made easy:

   

In order to obtain meaningful results from insulating oil testing, oil samples must be properly taken by instructed personnel. Here are a few tips to help you take samples without any issues:

Use a special sample container: for example, a clean aluminium bottle with a capacity of approx. 1 litre.

Store the sealing ring: When opening the sampling nozzle, the sealing ring may get lost when the safety cap is unscrewed. It must remain on the nozzle.

Avoid air bubbles: Removal should be take place using a device that features an inspection window. This ensures any air bubbles are detected. Air bubbles falsify the oil sample. This device is first screwed onto the nozzle.

Pay attention to your surroundings: When taking samples outdoors or in a dirty environment, make sure that no foreign bodies or drops are able to enter the bottle.

Close: After filling the bottle, make sure it is sealed airtight using the screw cap. The bottle needs to be filled to the brim with oil so that no air remains in the bottle neck. After sealing, the bottle can be cleaned, packed and the excess oil can be disposed of.

Flushing: A hose is attached and the oil is removed until no more air bubbles appear. Flushing the hose with one to two litres of oil is usually sufficient.

Flushing the sample bottle: The sample bottle (already cleaned and dried) is then filled with oil, then placed on its side and swivelled or rotated so that the oil dampens the entirety of the wall surface and absorbs any remaining dirt particles. The oil used for flushing the bottle must then be poured out and disposed of properly at a later point.

Taking samples: For the actual sampling, the hose connected to the sampling nozzle should reach to the bottom of the sample container. The bottle is slowly filled to avoid bubbles until it overflows. Up to 50 % of the bottle's contents may overflow. This produces a homogeneous sample without gas pockets. The overflowing oil needs to be collected, e.g. in a bucket, and disposed of properly.

How often should insulating oils be tested? How often should insulating oils be tested?

Application video

Video tutorial: sampling liquids | BAUR GmbH

Video tutorial on sampling insulating liquids (EN)

This video tutorial demonstrates how to take a sample of insulating liquid according to IEC 60475.

Explanatory video

Explanatory video: Insulating oil testing - part 1 (subtitles in EN)

Transformers are designed to be in operation for 40 years or even longer. For the responsible body, their positive economic balance is heavily dependent on avoiding repair times and possible downtimes. The insulating oil testers from BAUR enable you to ensure the reliable operation of your transformers.

Explanatory video: Insulating oil testing - part 2 (subtitles in EN)

The insulating oil is a decisive criterion for reliable operation. Its ageing condition, which is affected by oxidation, thermal stress, and contact with other materials, essentially determines the service life of the transformer. The insulating oil testers from BAUR enable you to ensure the reliable operation of your transformers.

Explanatory video: Insulating oil testing milestones

Even after decades of use, BAUR devices deliver precise measurement results in terms of insulating oil testing and diagnostics because they are designed for hundreds of thousands of oil sample measurements.

Application video

Video tutorial: sampling liquids | BAUR GmbH

Video tutorial on sampling insulating liquids (EN)

This video tutorial demonstrates how to take a sample of insulating liquid according to IEC 60475.

Infographics

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Insulating oil testing at a glance

The most important functions of the Iso devices as well as their area of application and potential are summarised in clear graphics.

Product information

Data sheet (choose language)
Data sheet (english) Data sheet (english)
Data sheet (czech) Data sheet (czech)
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Data sheet (dutch) Data sheet (dutch)
Data sheet (polish) Data sheet (polish)
Data sheet (rumanian) Data sheet (rumanian)
Data sheet (turkish) Data sheet (turkish)
User Manual User Manual

Literature

Brochure: Insulating oil testing Brochure: Insulating oil testing

BAUR References

Insulating oil testing

Referenzstory: akkreditierte Isolierölprüfung | BAUR GmbH

Transequipos, Colombia

Accredited oil testing with the BAUR DTL C oil tester

For laboratories and network operators around the globe, the outstanding feature of oil testers from  enowned company BAUR is their reliability. An excellent example of this is provided by the highly regarded Colombian testing laboratory Transequipos, which specialises in carrying out dielectric oil analyses. Their accreditation by ONAC and IDEAM means that the precision and quality of the results are of vital importance.

 

Customer:
Transequipos, Colombian testing laboratory

BAUR solution:

Dielectric oil analysis with the BAUR DTL C

Read BAUR Reference Read BAUR Reference
DTL C DTL C
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