Insulating oil testing: Oil breakdown voltage tester DPA 75 C I BAU...

Insulating oil testing with the BAUR DPA 75 C

The BAUR DPA 75 C oil tester developed especially for mobile use in the field is one of its kind in the market due to its functionality and excellent user benefits in comparison to the costs. The BAUR DPA 75 C delivers clear and reliable measurement results.

Compact and robust device for portable use onsite
Test voltages from 0 to 75 kVrms
Repeatable breakdown measurements in mineral, silicone and plant oils
Reliable measurement results due to its short switch-off time (< 10 μs)

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

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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.