EOS® Mobile Processing Units: EOS operates Europe's largest fleet

Electrical Oil Services operates a significant fleet of special units both for transformer oil regeneration (deep-cleaning) and for mobile oil processing. In this article, we present in particular the mobile units that process transformer oil, such as filtering, degassing and drying. 

Do you need to treat your transformer oil routinely? Does the insulating oil need to be processed after maintenance? Or is a new power transformer to be filled under vacuum?

With more than 60 years of experience, Electrical Oil Services (EOS^®) is one of the leading providers of mobile insulating oil services. These are carried out in-situ at the customer or transformer site. EOS^® own a significant fleet of units, both for mobile oil processing (MPU, Mobile Processing Unit) and for mobile regeneration (MRU, Mobile Regeneration Unit), meeting the most stringent requirements.

If insulating oil processing is the first choice

Insulating oil processing or reconditioning works by passing the transformer oil through strainers and filters to remove particles before it is heated and passed through a vacuum chamber.  This process improves the physical performance of the electrical insulation oil in transformers, tap-changers and switchgear. The dielectric strength of the oil is improved along with a lowering of the moisture and gas content within the oil.

EOS^® MPUs are self-contained vehicles specifically designed for the filling and treatment of transformer oils.

EOS^® Mobile Processing Units (MPUs) - Tasks and Services

The EOS^® mobile processing units (MPUs) perform the following tasks:

• Replacing the insulating oil on transformers and on-load tap-changers 
• Reduce insulating oil volume to enable repair and maintenance work on transformers 
• Drying, filtration and degassing
• Filling of new transformers under vacuum 
• Analysing results at site using certified laboratory equipment.
  
  

These features for the performance of the EOS^® MPUs are worth highlighting:

• Heating capacity up to 200 kW:
  Even in adverse weather conditions or cold ambient temperatures, the additional heating capacity allows us to achieve sufficient temperatures to effectively treat the oil within the transformer.
• Vacuum pump performance below 1 millibar:
  Using the latest dual stage vacuum pumps we are able to quickly reduce the pressure inside the transformer to less than 1 millibar and hold the for the required period of time.  The second bank of dual stage pumps is then used to act upon the vacuum chamber as part of the filling or reconditioning process.
• Flow rates of up to 5,000 litres per hour: 
  However, the maximum flow rate will be tailored to suit each individual transformer and insulating fluid requirement.

For every need, the EOS^® fleet offers the right solution

The fleet of EOS^® oil processing units can serve different applications and cover individual needs for:

• Small transformers or transformers that are difficult to access
• Transformers located offshore, such as in offshore wind farms
• Very large transformers with a rated power of up to 800 MVA  

The EOS^® fleet ranges from smaller, lightweight MPUs to MPUs with an unladen weight of 28 tonnes. It is important to match the capability of the units with the requirements of the transformer or switchgear.

In addition to processing equipment, each MPU includes test equipment for measuring breakdown voltage, moisture content and dissolved gases. These measurements are taken after transformer oil processing and the results of the measurements are recorded. In this way, progress can be accurately documented and used for a meaningful final report.

Continual monitoring: EOS^® recommends that the treated transformer oil is analysed for important parameters such as moisture and dielectric strength. This insulating oil management ensures that the transformer oil meets the required quality and that your transformer is protected in the long term.

Read more about transformer oil management:

• EOS^® Database: Sound decisions in transformer management.

Conclusion

Electrical Oil Services is your European expert in recycled and new insulating oils and related services for transformers, operating Europe's largest fleet of service units, including our Mobile Processing Units (MPU) and Mobile Regeneration Units (MRU).

Our quality-assured EOS mobile processing units are state-of-the-art, self-contained service vehicles. They have been specifically designed to meet the most demanding transformer oil filling and processing standards. Their outstanding performance speaks for itself.

Get a quick overview on Electrical Oil Services:
Electrical Oil Services (EOS^®) is your pan-European expert in recycled & new insulating oils and comprehensive transformer services

Find out more about our services and products in these articles:

• For transformers: The recycled EOS^® Premium insulating oil proves its worth
• Insulating oils & services: Electrical Oil Services at a glance

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