Vacuum Filling of Transformers

The ESI VAcuum Dryer/Degasser units are designed as versatile Transformer Oil Filter units for field or factory use.

These units are used by ESI to do Vacuum filling of transformers. ESI has a dedicated plant to do this work processing new transformer oil. The unit has an inline Vaisala moisture meter to constantly monitor all moisture content. There is also a Megger dielectric breakdown tester with the rig at all times.

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Supply of New and Regenerated Oil

ESI has a range of high quality new and regenerated oils:

We stock in NZ and distribute new transformer oil from US-based Ergon International, the world largest producer of naphthenic transformer oil and with a global presence and a strong supply chain backed up by a network of depots in the US, EU, Asia and Australia.

We recover used mineral transformer oil and regenerate (reclaim) it to high standards for re-use in transformers and in other applications, one of our commitments to the Environment .
All our products come in 200L drums, 1000L IBC and bulk.

Contact us so we can discuss your specific requirements and the best solution for you.

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Transformer Oil Collection, Delivery and Storage

ESI is equipped to treat oil in tank farm stock, de-energised transformers as well as energised transformers. All work is done in accordance with company procedures, which are updated on an on-going basis to ensure compliance with the latest technology and legal requirements.

  • Recycling of used Tank-stock of Drummed Transformer Oil to as-new
  • Recycling of Bulk or Drummed Transformer Oil to as-new condition
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Portable Filter Hire

We have portable filter units available for hire. These filter units are simple to use, plug into a standard domestic power supply, yet, will remove free, emulsified and dissolved moisture in oil from 50ppm down to <10ppm in a single pass. Particles are also removed to <0.4 micron ensuring the electrical properties of insulating oil always meet specification. An in-line moisture meter comes standard with the filter unit so maintenance crews can re-energise field equipment with confidence. Versions of this unit are also available for Lubrication and Hydraulic oils.

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Oil Sampling & Testing

Condition monitoring is of paramount importance in the maintenance of your transformers. Oil sampling is conducted by experienced personnel of ESI, thereby ensuring the consistency of the sampling process and the reliability of the laboratory test data.

Oil analysis and subsequent recommendations are made by qualified and experienced ESI Staff, supported by certified laboratories such as TJH2b and Powerlink and transformer experts. ESI's trained technicians have a long history in the electrical industry and can assist in your diagnostic testing.

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Vacuum Drying/Degassing of Transformers Off- & On-Line

The ESI VAcuum Dryer/Degasser units are designed as versatile Transformer Oil Filter units for field or factory use. The units use high capacity multi-stage electric oil heaters, large capavity vacuum pumps with external connections and 3 stage particulate filtration. Flow rates up to 6000 litres/hr are available.

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Transformer Oil Regeneration On-Line & Off-Line

Off-Line and On-Line transformer Oil Regeneration not only restores the oil to a new condition, but it also removes sludge and other contaminants from the transformer windings and cooling system. lowering operating temperatures and preventing re-contamination of the oil.

Maintaining the chemical properties of insulating oil through regeneration ensures maximum Transformer life and reliability.

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