Vacuum Oil-Purifiers AEHV

Vacuum Oil-Purifiers AEHV

The most important applications of high vacuum degasifiers are in the field of extra high voltage transmission and in the manufacture of electrical apparatus for it. In addition, the high vacuum process is used in the degasification of cable oils including polybutenes. Outside of the electrical industry, this process is used for dehydration and degasification of oils for radar and electronic equipment, vacuum pump sealing oils, brake fluids, refrigeration oils—including phosphate esters and silicones. Amperis offers the AEHV Vacuum Oil-Purifier series designed for maximum efficiency in your operations…performance tested by experts, requiring minimum maintenance, and providing long, trouble-free service. Backed by the full resources of Amperis’ technical specialists, plus “know-how” and thorough research, your Vacuum Oil-Purifier is unique. Designed for unattended operation and suitable for operation on energized equipment—complete monitoring equipment is also available.

Description of Process:

  • Oil is introduced into the vacuum chamber, where water, dissolved air and gases, and other low-boiling-range volatile contaminants are removed. Special chemically-inert accelerator cartridges in the vacuum chamber are employed to serve the following functions:
    1. First, their in-depth design structure allows free water to be rapidly separated from oil by coalescence even before it reaches the evaporation stage.
    2. Second, millions of glass fibers 3-10 micrometer diameter provide a large total surface area for exposure of the thin oil film to the vacuum.
    3. Third, sharp points of the glass fibers promote fast release of gases and vapors from oil.
    4. Fourth, the elements act as a fine filter removing solid contaminants. The cartridges are easily replaced and disposable.
  • This method is more efficient than previously used spray nozzles and baffles which required several passes to obtain the same degree of degasification.


  • The typical performance achieved with the AEHV series is:
    1. Dehydration—at minimum oil temperatures of 27°C the water removal is from 50 ppm to less than 5 ppm.
    2. Degasification—reduce soluble air content from full saturation of approximately 12% to less than 0.25%.
    3. Particulate matter—standard after-filter provides filtration down to 0.5 micron
  • Other contaminants such as products of oil oxidation, thermal degradation, dissolved varnishes, paints and acids can be removed by the addition of optional Fullers Earth filters to the system.

Standard and Special Options for AEHV



Standard Configuration:

Special Options:


Unattended operation


Extra heater capacity for faster temperature rise


TOLMS (Transformer Oil Level Monitoring System)


Oil level controller


Outlet heater to assist in maintaining transformer temperature


Reverse flow changeover valves


Foam controller



Mini-dehydrator for vacuum pump oil conditioning


TEFC motors


Diesel or gas boiler to minimise power consumption


Hose storage reels


Mechanical seal oil pumps


Onboard power generator


Power cable storage reel


Low watt density heaters


Onboard Fullers Earth system (E575A series)


Multi-voltage power input


IP52 central control panel


Inline dielectric strength tester


Interstage condenser


Welded steel piping


Inline RGA


Refrigerated cold trap


Exclusive processing chamber


Fully air-conditioned operators cabin


Full aluminium trailer, from tagalong up to 16m semi-trailer


PLC control


Remote monitoring


Soft-side tarpaulin tagalong trailer


0.5 micron after-filter


Wireless emergency dialout


EEx or NEMA 7 explosion-proof




Touchscreen MMI


Full stainless steel option







Vacuum Oil-Purifiers AEHV transportVacuum Oil-Purifiers AEHV in transportModel Nomenclature Chart for AEHV

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