Buying Guide for Transformer Oil Filtration Machine Part I

This article is a buying guide for companies or individuals who need to purchase transformer oil filtration machines. At the same time, it is also an article about transformer oil filtration comprehensively, which can be used as a reference for engineers with experience in transformer oil filtration and transformer maintenance & erection.

Quick Navigation

A.     Benefits of Transformer Oil Filtration

B.     Find A Good Transformer Oil Filtration Machine

1.      Mechanical Filter

2.      Centrifuge

3.      Coalescing Filter & Precipitation

4.      Standalone Regeneration Unit

5.      Vacuum Transformer Oil Purifier

6.      Vacuum Transformer Oil Regeneration Plant

C.     Oil Contamination Condition

D.     Processing time

E.      Transformer Voltage Grade

F.      Project Budget

G.     Working Environment

H.     Customized Design

I.       Online Testing Instruments

J.      Other Equipment for Transformer Maintenance

K.      PURETECH Sales and Technical Support

A. Benefits of Transformer Oil Filtration

---

þ Improve oil insulation properties

þ Extend life span of power transformers

þ Lessens transformer’s breakdown

þ Good returns on investment for having a quality machine

B. Find A Good Transformer Oil Filtration Machine

---

1. Mechanical Filter:

It is a portable oil filter trolley that filters impurities through filter paper or high-precision filter elements. Its advantages are small size and light weight, and it is especially suitable for oil transportation and filtration between tanks. But the disadvantage is that the water contained in the oil cannot be removed.

Item	Plate and Flame Oil Filter Unit- Model PF	Portable Oil Filter Cart- Model OFC
Filter media	Filter paper	Filter cartridges
Filter Fineness	5 ~ 10 micron	1 micron (0.5~5 microns optional)
Targeted Contaminants	þ Impurities and dirt þ Trace moisture	þ Impurities and dirt
Picture	MODEL PF	MODEL OFC
Extra Function	For oil transferring from one tank to another

2. Centrifuge:

The centrifugal force removes the particulate impurities and a large amount of water in the oil. The advantage is that there are almost no consumables and reduce maintenance costs. The disadvantage is that it cannot meet the refined filtration treatment, for example, the moisture in the oil can only be reduced to about 500 ppm at most, which does not meet the requirements of transformer oil for moisture.

Item	Centrifugal Oil Separator- Model CS
Filter media	Centrifuge
Filter Fineness	1 micron (0.5~5 microns optional) With Filter cartridges
Targeted Contaminants	þ Impurities and dirt þ Free water
Picture	MODEL CS

3. Coalescing Filter & Precipitation:

Coalescing oil filter is mainly used to remove the water in the oil, through the water separation filter element to condense the trace water in the oil into water droplets, and then separated from the oil, and equipped with a filter element can remove impurities in the oil. The advantage is the same as that of a centrifuge. It does not use consumables, but it cannot achieve the dehydration effect required by the transformer oil.

Item	Coalescing Oil Purifier- Model COP
Filter media	Coalescing separation
Filter Fineness	1 micron (0.5~5 microns optional) With Filter cartridges
Water Content after Processing	≤ 100 ppm
Targeted Contaminants	þ Impurities and dirt þ Free water
Picture	MODEL COP

4. Standalone Regeneration Unit:

It is an oil regeneration unit which mainly removes acid, oxides and other decaying products from transformer oil. The adsorbents inside oil regeneration unit reacts with contaminants in the transformer oil, forms particulate impurities or sludges that can be intercepted by the filter element. If you already has a vacuum transformer oil filtration machine, and need a regeneration unit for removal of acidics and oxides, as well as improving oil color, then this standalone oil regeneration unit will be your good choice.

Item	Standalone Transformer Oil Regeneration Unit - Model RD
Filter media	Filter cartridges & Adsorbents
Regeneration media	fuller's earth, silica gel, activated alumina, molecular sieves
Filter Fineness	Filter cartridge: 1 micron (0.5~5 microns optional)
Targeted Contaminants	þ Impurities and dirt þ Acids, oxides and decaying products þ Improve oil color
Picture	MODEL RD

5. Vacuum Transformer Oil Purifier:

It is the most widely used oil filtration machine for processing transformer oil. Not only because it is more efficient in treating the water in the transformer oil, but also can remove the trace water in the oil, reducing the water content to 7PPM or 5PPM. It significantly improve the breakdown voltage of transformer oil, reaching above 60KV or even above 75KV, which fully meets the standards for transformer oil filtration.

Item	Vacuum Transformer Oil Purifier- Model DVOP/VOP
Filter media	Filter cartridges
Filter Fineness	1 micron
Water Content After Processing	≤ 5 PPM or ≤ 7 PPM
Targeted Contaminants	þ Impurities and dirt þ Water
Picture	MODEL DVOP	Double-Stage High Vacuum Transformer Oil Purifier Rotary vane vacuum pump + Roots booster vacuum pump
	MODEL VOP	Single-Stage Vacuum Transformer Oil Purifier Rotary vane vacuum pump

6. Vacuum Transformer Oil Regeneration Plant:

· It It is an oil regeneration plant which combines vacuum transformer oil purifier and standalone oil regeneration unit, so it can do all procedures of filtration, degassing and regeneration with one plant. It is especially suitable for the deteriorated transformer oil which contains oxidation by products. It can significantly improve oil color and appearance.

Item	Vacuum Transformer Oil Regeneration Plant- Model DVOP-R
Filter media	Filter cartridges & Adsorbents
Regeneration media	fuller's earth, silica gel, activated alumina, molecular sieves
Filter Fineness	1 micron
Water Content After Processing	≤ 5 PPM
Targeted Contaminants	þ Impurities and dirt þ Water þ Acids, Oxides and decaying products
Picture	MODEL DVOP-R	Double-Stage High Vacuum Transformer Oil Regeneration Plant It can also improve oil color.

C. Oil Contamination Condition

---

The common pollution of transformer oil mainly comes from moisture and gas in the air, impurities, acidic substance and decaying products due to oxidation, etc. which need to be removed through different processing methods. At present, the more commonly used transformer oil filtration methods mainly include the following.

D. Processing time

---

When choosing an vacuum oil purification machine, the first thing to be considered is the amount of oil to be filtrated. The appropriate flow rate of an Vacuum Oil Purifier is to be able to purify transformer oil in a container for two-time or three-time treatment in 8 hours.

For example,

Oil amount in transformer (Liters)	Suitable Oil Treatment Capacity (Liters/Hour)
2,400	600
4,800	1,200
7,200	1,800
12,000	3,000
24,000	6,000
36,000	9,000
48,000	12,000
60,000	15,000
72,000	18,000

Note:

F In some cases, the moisture content of transformer oil is high before vacuum degassing, it is recommended to choose a transformer oil filtration machine with a bigger capacity.

F The flow rate in the above table is only for recommendation and reference, and the specific needs to be determined by the user according to the transformer maintenance requirements.

Please click here to continue reading Part II.