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HOPU ZYD-V Series Mobile FR3 Vegetable Transformer Oil Filtration Machine is a portable oil purification system mounted on a trolley, skid, or trailer that is used for on-site maintenance of power transformers. It removes moisture, dissolved gases, and solid contaminants from transformer insulating oil, helping restore dielectric strength and extend transformer service life

Key Features

* Vacuum dehydration to remove free and dissolved water

* Vacuum degassing to eliminate air and gases

* Multi-stage filtration for particulate removal

* Mobile/trailer-mounted design for field operation

* Online and offline transformer oil treatment

* Weatherproof enclosure options for outdoor use

Applications

* Power transformers
* Distribution transformers
* Substations
* Switchgear and circuit breakers
* Electrical utilities and industrial plants

HOPU engineers have developed this mobile transformer oil filtration machine for FR3 transformer oil through multiple data studies.

Key Design Points for FR3 Natural Ester transformer oil purifier
FR3 is a soybean based natural ester oil with a water absorption rate 3-5 times that of mineral transformer oil, higher viscosity, easy hydrolysis and acidification, and high temperature oxidation. It cannot be used with conventional mineral transformer oil filtration machine structures. The core design is customized around six directions: temperature control, vacuum system, overcurrent material, dehydration structure, acid removal, and sealing.

1. Heating system design (FR3 dehydration is the most critical, distinguishing it from low-temperature heating of mineral transformer oil)
2. Setting of working temperature range
Conventional dehydration mineral transformer oil is generally dehydrated at 40℃, and FR3 must be heated to significantly reduce the solubility of water in ester oil, combined with vacuum precipitation of dissolved water.
2. Heater structure
Adopting stainless steel seamless tube bundle/cast aluminum heating, it is forbidden to directly immerse bare wire electric heating tubes in oil to prevent local overheating carbonization and cracking of FR3.
3. Pipeline heat tracing: Insulation heat tracing is applied to the inlet and outlet of the vacuum tank and the filter housing to avoid secondary water dissolution caused by cooling water return.

4. Vacuum flash separator (core dehydration bin)
Expansion chamber: With the same flow rate, the volume is 35% larger than that of mineral transformer oil models. It features a three-dimensional spray and multi-layer corrugated analysis network, resulting in a thin oil film and rapid water release; FR3 has high water content and is prone to foaming. It is equipped with anti foaming and foam breaking nets and anti foaming chambers to prevent oil from being sucked into the vacuum pump and causing oil leakage.
Besides, HOPU engineers team designed a condensation recovery device: FR3 has a large amount of water vapor, and is equipped with a vacuum exhaust condenser. The condensed wastewater is discharged separately to avoid water vapor reflux and oil contamination, and install a circulation pump to return the foam to the vacuum chamber and dehydrate again and again

HOPU Engineers also conduct professional design on the entire pipeline, sealing, and filter material (anti-corrosion, ester hydrolysis resistance) of the ZYD-V Series FR3 vegetable transformer oil purification machine 

1. Body and piping
The overcurrent chamber and pipeline of the whole machine are made of 304/316 stainless steel, and carbon steel is not recommended (FR3 hydrolysis generates organic acids to corrode carbon steel, and metal ions precipitate to catalyze further acidification of the oil).
2. Seals
All use FKM fluororubber, and prohibit nitrile NBR and ordinary rubber (ordinary rubber is swollen and leaked by FR3 natural ester); Flanges, pump bodies, and valves are fully fluorinated and suitable for long-term high-temperature working conditions.
3. Selection of three-stage filter cartridges (ordinary cellulose filter cartridges are prohibited)
• Coarse filtration: Stainless steel sintered mesh (resistant to 120 ℃ and acid), intercepting large particle impurities and sludge;
• Medium precision filtration: Modified fiberglass/polyester PET filter material (temperature resistance of 150 ℃, hydrolysis resistance), wood pulp cellulose is prohibited (due to expansion and damage caused by FR3 moisture, fiber detachment and pollution of oil products);

Filtering accuracy: Terminal NAS level 5-6, meeting the insulation requirements for FR3 operation