Transformers play an important role in power industry. And transformers convert power to appropriate levels for other system components to safely use. Transformers need to be maintained to guarantee long life. Moreover, a pure oil is important for the transformer to provide efficient performance.

Due to moisture, gases, impurities produced during the usage of transformer oil. The oil quality decreased, oil functions gets weak, it is time to take action for the oil to be filtered and purified.

Transformer maintenance and services centres maintain high quality equipment for treating oil using in line transformer oil filtration techniques. These techniques help sustain an excellent performance, safety and ease of operation for transformer maintenance staff.

To know more about transformer oil filtration machines, here are the things that you should know.

Transformer oil and its functions

Transformer/dielectric oil is often stable at high temperatures. Other than that, the following are functions of insulating oil:

• As cooler

Transformer oil has good thermal conductivity, which can quickly transfer the heat inside the transformer to the outside, help the transformer dissipate heat, prevent overheating, and ensure the normal operation of the transformer.

• As insulator

Transformer oil has good insulation properties and can effectively isolate the electrical contact between the internal wires and windings of the transformer, prevent electrical short circuits and breakdowns, and ensure the safe operation of the transformer.

• For security

ITransformer oil can protect the internal metal parts of the transformer from corrosion and rust, extending the service life of the transformer. At the same time, transformer oil can also absorb moisture and air inside the transformer to prevent moisture and oxygen from corroding and oxidizing the metal parts inside the transformer.

• Arc-extinguishing effect

ITransformer oil has good arc-extinguishing performance, which can quickly extinguish the arc when an arc occurs inside the transformer, prevent short circuits and open circuits, and ensure the safe operation of the transformer.

• Transmission function

ITransformer oil can be used as a transmission medium to transmit torque and motion, and can reduce friction and wear, improving the efficiency and life of the transformer.

Types of Insulating oil

• Paraffin based – derived from special crudes that contain substantial amount of n-paraffin. This type of insulating oil is less oxidised than naphtha based.
• Naphtha based – derived from special crudes that contain low amount of n-paraffin.

During the usage of insulating oil, it may be exposed to materials which can affect its quality. It fails to function due to factors such as excessive high temperature, oxidation and many more.

Consequently, the oil darkens in colour and the acid in it begins to increase. Oil impurities are one of the major causes of transformers deterioration.

Knowing transformer oil, so you aware your oil should be free from any contamination, dirt and moisture. Thus, transformer oil filtration process is needed.

In this procedure, insulating oil is tested and treated so that transformers will function efficiently.

A premium transformer oil purifier is required

To treat and purify insulating oil, transformer oil filtration process is required. Insulating oil filtration is a process of removing sludge and moisture from the transformer oil.

With a transformer oil purifier

• Insulation properties of the oil is improved
• Longer life span of transformers
• Lessens transformer’s breakdown
• Good returns on investment for having a quality machine

What happend if the tranformer oil unqualified?

• Arcing– formation of an electric arc which causes breakdown of the system
• Overheating – oil overheating
• Corona discharges– electrical discharge caused by the ionisation of fluid
• Insulating strength of the transformer oil will decrease

Transformer oil quality index:

• Dielectric Strength or Breakdown Voltage (BDV)
• Water Content
• Neutralisation Value
• Interfacial Tension
• Colour and appearance
• Test for Oxidation Stability
• Specific Resistance (Resistivity)
• Flash Point
• Pour Point
• Viscosity
• Sludge Test
• Dissolved Gas Analysis (DGA)

To further understand how the transformer oil is tested, below is the process.

Transformer oil working principle:

1. Rising oil temperature

First step is to raise oil temperature up to 65°C for better separating moisture and gases in the vacuum chamber. Heating the oil will make it easier to filter because of the decrease in oil viscosity.

2. Removal of dirt and impurities

Three stage filtration system ensure dirt, impurities and contaminants got rid from the oil.

3. Dehydration and degasification of insulating oil

Under high vacuum and negative pressure, mositure and gases will be removed in the vacuum chamber.

Transformer oil deterioration should be minimised

Research reports that 80% of oil related failures and breakdowns are caused by contaminated oil. Preventive oil maintenance is therefore an important factor to ensure optimum equipment reliability.

A successful insulating oil filtration procedure can be achieved by using a reliable transformer oil purification machine. This will extend the effectiveness and reliability of your transformer.

Where to get a reliable transformer oil purifier

Transformer oil filtration is a great help to any businesses. Thus, a good transformer oil filtration equipment is needed(mobile type with trailer available for outside work). There are many companies that offer different kinds of equipment. However, choose a vendor that manufactures high quality insulation oil purification machine that can ensure high Return on Investment (ROI).

Weineng offers proffessional transformer oil purification solutions. Welcome to contact  us freely with any questions or concerns about your oils.

Conclusion                              

Maintaining your transformer oil is necessary so that your transformers can function effectively. It doesn’t just help prolong your equipment’s life span, but also improve its efficiency.

WEINENG also offer vacuum pumping unit, transformer oil regeneration machine, dry air generator, breakdown oil tester etc. Contact us for more!!!

WEINENG specializes in designing and manufacturing of oil filtration machines for 13 years, could be customized according to clients’ requirements, we have different oil purifiers with multi flow rates, functions, applied to treat different oils. Contact us freely if you want to solve your oil problems, saving your business cost, protecting your machineries.

Ansen Zuo
Email: ansen@oilsolution.cn
           sales@oilsolution.cn

Whatsapp: + 86 136 68080522