Transformer Oil Dehydration Machine

  1. The transformer oil dehydration machine is designed for both new and old transformer oil.
  2. It can handle moisture, gas, particles, impurities, and acidic substances.
  3. The double-stage transformer oil dehydration plant enhances insulation oil properties.
  4. It quickly removes acidity, excess moisture, water traces, dissolved gases, and particulate matter.
  5. This process is effective in improving insulation oil quality.

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Technical Data of Transformer Oil Dehydration Machine

Item Parameter Model / Unit ZJA1.8 ZJA3 ZJA6 ZJA9 ZJA12 ZJA18
Technical Parameter Flow rate L/H 1800 3000 6000 9000 12000 18000
Working vacuity Pa ≤80
Working pressure Mpa ≤0.35
Temperature range 45-65
Power supply 50Hz 380V
(or as requested)
Total power KW 16 36 70 100 150 200
Inlet/outlet diameter DN 20/20 25/25 32/32 40/40 50/50 65/65
Size Length CM 160 180 220 250 280 345
Width CM 125 145 160 195 215 260
Height CM 200 220 245 270 300 300
Weight Kg 650 900 1200 1600 2200 3000

The machine size, the weight will change slightly due to different configurations.

Oil Treatment Index of Transformer Oil Dehydration Machine

Item Unit Oil Treatment Index
Breakdown voltage KV ≥70 (Spherical electrodes)
Water content ppm ≤5
Gas content % ≤0.3
Filtering accuracy micron 1

Performance of Transformer Oil Dehydration Plant

Performance Specification ( after 3 pass ) Initial Oil index
Moisture 4±2 ppm  50 ppm
Breakdown Voltage ≥75 kV  30kV   
Gas Content ≤ 0.10 %v/v 12%
Particle filter efficiency 99.5% of over 1um /

Customized Design of Transformer Oil Dehydration Machine

No. Components Options for your selection Economy design Advanced design Luxury design
1 Machine type A.Mobile  B. Skid  C. Trailer mounted  D. Others, please specify______ As you like As you like As you like
Your choice:  _____
(door and roof)
A. Open style   B. Metal  C. Stainless steel   D. Other please specify__ As you like As you like As you like
Your choice: _____
3 Vacuum pump A.Chinese brand  B. European brand (LEYBOLD, BUSCH,ATLAS) C.Other please specify_____ A B B
Your choice: _____
4 Roots pump A. Chinese brand  B. European brand (LEYBOLD, BUSCH,ATLAS) A A B
C.Other please specify_____
Your choice: _____
5 Oil inlet pump A. Gear pump -Chinese brand  B. Gear pump-European brand A D B or  C
C. Centrifugal pump- European brand  D. None
Your choice:  _____
6 Oil outlet pump A. Gear pump -Chinese brand  B. Gear pump-European brand A A B or C
C. Centrifugal pump- European brand
Your choice: _____
7 Electric elements A. CHINT  B. Schneider or ABB  C. Other please specify _____ A B B
Your choice: _____
8 Instruments
A. Digital vacuum meter + temperature controller ( Chinese brand )
B. SIMENS PLC + Digital vacuum meter and temperature controller (Chinese brand)
C. SIMENS PLC and touch screen + INFOCON vacuum sensor and JUMO  temperature sensor (International brand)
A A or B C
Your choice: _____
9 Other optional components A. Flow meter  B. Inline Water sensor (European brand)  C. Inline gas analyzer  (European brand)  D. Inline particle counter (European brand) N/A As you like As you like
Your choice: _____
  • All Chinese components are qualified from famous brands which we already used for many years.
  • YUNENG can add more functions or components according to the specific requirements of customers, and carry out product customization services.

The Danger of Moisture in Transformer Oil

Moisture in transformer oil leads to a number of undesirable consequences:

  • Intensive aging of insulating paper.
  • Decreases dielectric strength and partial discharge stability.
  • Accelerates the oxidation of transformer oil.
  • Increased carbon formation by electric arcing.
  • Increased corrosion of transformer metal parts.
  • The fluidity of the oil is reduced at higher temperatures.

The above problems can be solved by the transformer oil dehydration machine.

The Form of Moisture in Transformer Oil

Transformer oil dehydration Machine

In transformer oil, water mainly exists in three forms: dissolved water, suspended water, and sedimentary water.

Oil temperature has a great influence on the existence of moisture in transformer oil. When the oil temperature is high, the water in the oil is mainly dissolved water. If the water reaches the saturated solubility in the oil, it will become supersaturated due to the drop in the oil temperature and form extremely tiny water droplets suspended in the oil and become suspended water. When there is too much-suspended water, it will aggregate into large water droplets that separate from the oil, and deposit on the bottom of the oil to form sedimentary water.

Where does the Moisture in the Transformer Oil Come from?

  • Petroleum products themselves have a certain degree of water absorption and can absorb and dissolve a part of the water from the atmosphere.
  • During the process of packaging, transportation, and storage, transformer oil may enter moisture if it is not kept properly.

What are the Adverse Effects of Moisture on the Electrical Properties of Insulating Oil?

  • Moisture harms the electrical, physical, and chemical properties of the insulating medium.
  • Moisture reduces the breakdown voltage of transformer oil.
  • When the water content in the oil is 0.01%, the breakdown voltage is about 15KV.
  • When the water content is increased to 0.03%, the breakdown voltage drops to about 6KV.
  • Moisture also has a significant effect on the dielectric loss factor.
  • When the water content in the oil is 0.03%, the dielectric loss factor is 1*10-2.
  • When the water content increases by 15 times, that is, 0.10%, the dielectric loss factor increases to 2.1*10-2.
  • Moisture will promote the corrosive effect of organic acids on metals such as copper and iron.
  • The resulting saponification will deteriorate the oil’s dielectric loss factor, increase the oil’s moisture absorption, and accelerate the oxidation of the oil.

Machine Control of Transformer Oil Dehydration Plant

Transformer oil dehydration Machine
  1. This machine has temperature control, the temperature can be adjusted at request.
  2. This machine uses a photoelectric control device to automatically eliminate foam.
  3. This machine has a high oil level, and a middle oi level to automatically control the oil level.
  4. This machine adopts an over-pressure alarm device, it alarms when oil discharge pressure ≥0.5MPa
  5. This machine has a protection device for overheating, and the heater is not damaged when the oil supply is reduced or interrupted.
  6. Heaters can be divided into multiple groups
  7. This machine has a frequency converter, the flow rate can be adjusted by a frequency converter or oil return valve

In addition, YUNENG also manufactures and sells dry air generators, lubricating oil purifiers, transformer vacuuming systems, and more.


Rich Experience

Leading manufacturer in industrial oil and gas treatment with more than 25 years experiences.

Tailored Design

Specializes in making your systems suit your needs & requirements. Every system is custom engineered & custom designed. 

Professional Technical Team

Professional pre-sales, in-sale and after-sales service team to meat customer’s requirement

Reliable Quality, Durable System

Top-quality components and workmanship ensure high performance