The role of transformer insulating oil purification

Filtration of insulating oil

Insulating oil is widely used in electrical engineering, mainly for insulation, cooling and arc extinguishing. However, over time, various impurities and moisture may be mixed into the insulating oil, causing its performance to deteriorate. Therefore, it is essential to filter the insulating oil regularly.

1. Removal of impurities and particulate matter: 

During the use and storage of insulating oil, impurities such as metal particles and dust may be mixed into the insulating oil. These impurities not only affect the insulation performance of the oil but may also cause short circuits or failures of electrical equipment. Through filtration, these impurities can be effectively removed to ensure the purity of the insulating oil.

2. Dehydration and degassing: 

The presence of moisture and gas can seriously affect the performance of insulating oil. Moisture can reduce the insulation strength of the oil and even cause breakdown accidents of electrical equipment; while the gas dissolved in the oil may precipitate during the operation of electrical equipment, forming bubbles and affecting the insulation effect of the oil. Filtration can effectively remove this moisture and gases and improve the stability of the insulating oil.

3. Restore and improve performance: 

By treating the insulating oil with professional filtering equipment, harmful substances can be removed and its performance can be restored to a state close to its original state. At the same time, filtration can also increase the breakdown voltage and service life of the oil, ensuring the safe and stable operation of electrical equipment.

Application fields of insulating oil

Due to its excellent electrical properties and thermal stability, insulating oil is widely used in various fields:

1. Transformer oil: 

The transformer is an important equipment in the power system, used to step up or down to meet the voltage requirements of different users. Transformer oil is mainly used for insulation and heat dissipation of the transformer. By using high-quality transformer oil, the operating efficiency and service life of the transformer can be effectively improved.

2. Switch oil: 

In high-voltage switchgear, insulating oil plays the role of insulation and arc extinguishing. When the switchgear cuts off the current, an arc is generated. Insulating oil can quickly extinguish the arc and protect the equipment from damage.

3. Capacitor oil: 

Capacitors are devices used to store electrical energy in power systems. Capacitor oil needs to have good electrical properties and stability to ensure the normal operation of the capacitor.

Characteristics and selection of electrical insulating oil

When selecting and using electrical insulating oil, the following key factors need to be considered:

1. Insulation performance: 

This is the most basic and most important performance indicator of insulating oil. High-quality insulating oil should have high breakdown voltage and low dielectric loss to ensure the safe and stable operation of electrical equipment.

2. Oxidation stability: 

In order to avoid the oil from deteriorating due to oxidation during use, it is necessary to ｓｅｌｅｃｔ insulating oil with good oxidation stability.

3. Low temperature performance: 

For electrical equipment used in cold areas, the low temperature fluidity of insulating oil is an important indicator. High-quality insulating oil should be able to maintain good fluidity at low temperatures.

It can be seen from this that insulating oil filtration is a key link to ensure its excellent performance and service life. By regularly filtering the insulating oil, impurities, moisture and gas can be effectively removed, thereby improving its insulation strength and stability. 

At the same time, when selecting and using insulating oil, it is necessary to consider its insulation performance, oxidation stability and low temperature performance. The correct oil selection and use method is of great significance to ensure the safe and stable operation of electrical equipment.