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DO YOU HAVE ANY QUESTIONS OR SUGGESTIONS?

PLEASE FILL OUT THE FORM BELOW AND WE WILL CONTACT YOU VERY SOON.

Contact Us!
DO YOU HAVE ANY QUESTIONS OR SUGGESTIONS?

PLEASE FILL OUT THE FORM BELOW AND WE WILL CONTACT YOU VERY SOON.

OR DO YOU PREFER A DIRECT LINE TO OUR LOCATIONS?

 

STANLOW

Electrical Oil Services
Bridges Road, Ellesmere Port
Cheshire, CH65 4EQ,
UK

Phone: +44 0845 602 1003
E-Mail: EOS@h-c-s-group.com


HAMBURG

Electrical Oil Services GmbH
Oehleckerring 6a
22419 Hamburg
Germany

Phone:+49 40 500910850
E-Mail: sales@electricaloilservices.com

 

DUISBURG

Electrical Oil Services GmbH – Werk Duisburg
Krabbenkamp 11
47138 Duisburg
Germany

Phone: +49 203 45 65 482
E-Mail: info-duisburg@electricaloilservices.com

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INSULATING OIL PROCESSING

To improve the quality of your transformer oil

REACH THE OPTIMUM OIL QUALITY WITH
DEGASSING, FILTERING AND DRYING

Does your oil analysis recommend a more economical solution for processing insulating oil rather than full oil regeneration? Or would you like to have your new transformer filled with insulating oil with modern and quality assured equipment? With our Mobile Processing Units (MPU) we can reliably fill your on-site transformers or degas, filter and dry your transformer oil during operation.

Thanks to the EOS® Service Units (MPU) of different sizes, the Electrical Oil Services experts can easily cover individual needs – regardless of whether the transformers are small, large or difficult to access or are used offshore. 

Learn more about our mobile oil treatment units in our blog:
→ EOS® has Europe's largest fleet

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THE INSULATING OIL PROCESS INCLUDES

 

 

DEGASSING The gases dissolved in the transformer oil must be removed. This is because bubbles in the insulating oil can get stuck in the winding and cause small flashovers and damage to the cellulose.   
FILTERING

Dirty insulating oil is cleaned with µm filters and particles as well as solids are removed. This enables consistent performance of your transformers.

 
DRYING

Moisture severely affects the dielectric properties. The EOS® MPUs offer a heating capacity of up to 200 kW to operate in cool temperatures. This allows us to ensure that your insulation medium is dry.

 
INSULATING OIL PROCESSING

SERVICE FOR THE INSTALLATION, REPAIR OR MAINTENANCE
OF OIL-FILLED TRANSFORMERS

EOS® Mobile Processing Unit (MPU)

  • Carries out mobile and stationary insulating oil treatments such as drying, filtering and degassing.
  • Replenishes the insulating oil filling on transformers and tap-changers.
  • Lowers oil levels for repair and maintenance work on transformers.
  • Fills new transformers under vacuum with insulating oil.
  • Monitors the treatment of the transformer oil directly on site using certified laboratory equipment.

 

Our experts carry out the insulating oil processing with our EOS® Mobile Processing Units (MPUs). These are dedicated and specially equipped vehicle.

In addition to technical equipment, each MPU includes extensive analytical equipment for measuring specified parameters for the customer, such as breakdown voltage, interfacial tension and water content. These measurements are taken after each complete cycle of the transformer oil. The results of the measurements are recorded and used to evaluate the progress of the work. At the end, our customers receive a comprehensive final report.

Learn more about our MPUs: → Electrical Oil Services has Europe's largest fleet

Talk to our experts.

Schedule your individual consultation now!

WHEN IS THE MOST APPROPRIATE TIME FOR AN INSULATING OIL PROCESSING?

When a transformer is filled for the first time with new unused insulating oil, the acidity neutralisation figure will be <0.01 mgKOH/g. As the transformer ages, the action of heat and oxygen results in the oil oxidising as the oil’s “natural” inhibitors are depleted. Polar compounds in the transformer oil such as acids and early­stage sludge can be produced. It is these complex compounds which attack the transformer paper insulation, leading to weakening of the insulation and an inability to withstand close­up faults and through faults. Once the paper is damaged it cannot be repaired. 

 

EOS® recommendation:

Ensure that your transformer oil is analysed regularly and conduct a cost-efficient insulating oil processing at the earliest stage possible, when acidity levels rise.

 

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TRANSFORMER OIL PROCESSING IS REQUIRED

TOUCH

After repair and maintenance: Insulating oil processing is effective and reliable against physical contamination

After repair and maintenance: Insulating oil processing is effective and reliable against physical contamination

Vacuum pumps carry out the drying process at a pressure level of less than 1 mbar and evacuate dissolved gases and water vapour so that the transformer oil regains its original quality. The process includes degassing, filtering and drying.

TOUCH

Before commissioning a new transformer: Insulating oil processing allows a flawless and safe start from the beginning

Before commissioning a new transformer: Insulating oil processing allows a flawless and safe start from the beginning

During the manufacturing process of a transformer, oil and paper absorb moisture from the environment. This must be removed in several stages and under vacuum before the transformer is put into operation. The procedure corresponds to the treatment used for  repairs or maintenance.

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HOW WE WORK

Insulating oil processing after repair and maintenance - effective and reliable against physical contamination

Vacuum pumps carry out the drying process at a pressure level of less than 1 mbar and evacuate dissolved gases and water vapour so that the transformer oil regains its original quality.

Filling new transformers - flawless and safe from the start

During the manufacturing process of a transformer, oil and paper absorb moisture from the environment. This must be removed in several stages and under vacuum before the transformer is put into operation. The procedure corresponds to the treatment used for  repairs or maintenance.

EOS® BEST PRACTICE

Find out more about our work on these pages:

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Steel production
Almost like NEW - investing in 20 neglected transformers
Objective: Ensure reliable production by extending transformer lifetime
Solution: EOS® insulating oil regeneration 
Step-by-step deep cleaning for twenty 66 kV transformers

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Combined heat and power (CHP) plant
Remove potentially corrosive sulphur from 230,000 litres of transformer oil
Objective: To remove the additive from the 1990s called DBDS
Solution: EOS® insulating oil regeneration 
A total of 50 days of thorough deep cleaning to reduce the DBDS content from 100 ppm to <5ppm

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Energy supplier
Extend the service life of transformers by 15 years without high investments
Objective: To deep-clean the insulating oil systems and to remove acids and sludge
Solution: EOS® develops refurbishment strategy for insulating oil regeneration during operation
Start of an era: Making sustainable asset management for transformers possible

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Grid operator
Filling a 132 kV transformer after maintenance work
Objective: Remove contamination and achieve maximum dryness of the insulating oil
Solution: EOS® insulating oil processing
Restore safety with the Mobile Processing Unit (MPU) after warning message

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Distribution system operator
Finding a solution when the newly ordered transformer is delivered late
Objective: Put the decommissioned transformer back into operation
Solution: EOS® insulating oil treatment
Drying the oil in the old transformer with extensive vacuum/heat treatment

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Transformer OEM
Although stored in a dry atmosphere for a long time, the new transformer need to be installed in gas and steam turbine (CCGT) power plants
Objective: To generate a vacuum of less than 1 mbar at low cost and then fill the transformer with insulating oil
Solution: EOS® Mobile Vacuum Unit (MVU) and Mobile Processing Unit (MPU)
Enable cost-effective transformer installation

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Steel production
Which transformer first? Prepare a professional transformer management system
Objective: Organise monitoring for each individual transformer at the production site to avoid failures
Solution: EOS® develops customised test procedure for regular sampling
Classify transformers according to importance for scheduled transformer oil analyses

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Large power plant
Replace a 275 kV generator transformer and store the insulating oil temporarily
Objective: To store the company's own transformer oil for later re-filling into the new transformer
Solution: EOS® combines Mobile Processing Unit (MPU) and laboratory services with tanker lorries and storage tanks
Oil transport and storage off-site including consistent oil quality monitoring

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Aluminium company
Sustainably remove 150,000 litres of insulating oil from decommissioned factory
Objective: Remove the insulating oil from the transformers and save the oil
Solution: EOS® organises and monitors the draining of the insulating oil in order to recycle it
Recycling of transformer oil: Collecting the used oil, improve the quality and return the oil to the market as recycled insulating oil

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Distribution grid operator
25,000 litres of insulating oil from the main tank of a 132 kV transformer temporarily stored on site
Objective: To repair tap changers in an ecologically sensitive area and put them back into operation quickly after filling
Solution: EOS® insulating oil processing after interim storage of the transformer oil in an oil-rinsed, certified tanker truck
Insulating oil storage and 2-fold circulation directly and promptly on site