Source and treatment of moisture in transformer insulating oil
2020/1/19??????view:
Source and treatment of moisture in transformer insulating oil
1、 What is transformer insulating oil?
Insulating oil is mainly used to insulate the transformer from arc extinction. The main properties of insulating oil are low temperature performance, oxidation stability and medium loss. Low temperature performance refers to the fluidity necessary for the oil to automatically convection in electrical equipment, derive heat and cut off the arc current instantaneously under low temperature conditions.
Generally, it is required that the viscosity of insulating oil is small at low pour point and low temperature. In electrical equipment, oil is oxidized by heat and oxygen under the action of electric field for a long time. The oxidation stability of the oil with antioxidant and metal passivator is better. Dielectric loss reflects the degree of dielectric loss of oil products under AC electric field, which is generally expressed by tangent value (Tan δ) of dielectric loss angle (δ).
2、 Source of moisture in transformer insulating oil.
In the process of packaging, transportation and storage management, if the transformer insulating oil is not properly kept, it may enter into the water. In addition, the petroleum products have a certain degree of water absorption, which can absorb and dissolve a part of water from the atmosphere or in contact with water. The water absorption capacity of the insulating oil is related to its composition and temperature environment. Generally speaking, the water dissolving capacity of insulating oil is about 40 × 10 "at 20 ℃. The water content of transformer oil can be reduced to about 10 × 100 through industrial dehydration device. In addition, the moisture absorption of oil increases linearly with the air phase humidity and oil temperature. For example, when the relative humidity of the oil sample is 40%, the water content in the oil is 80 × 10 ~, when the relative humidity is 80%, the water content in the oil is 200 × 10 ~. The water absorption of oil products with different chemical composition can reach the difference of dozens of 10 ". The more aromatic hydrocarbon components in oil, the higher the moisture absorption of oil products. The presence of some polar molecules in oil can also increase the moisture absorption of oil products.
Water exists in insulating oil in three ways:
1 floats. Water is suspended in oil in the form of water droplets.
② Floating. It refers to the extremely small water drop of water evenly distributed in the oil.
③ Dissolved. Water is dissolved in oil.
The water content (absorption) of insulating oil is related to several factors:
(1) It is related to the chemical composition, temperature, exposure time and aging degree of oil;
(2) The water content of oil increases with the increase of oil temperature and decreases with the decrease of oil temperature;
(3) With the increase of aromatics content in oil products, the water absorption capacity of oil also increases.
3、 Treatment of moisture in transformer insulating oil.
A new type of oil purification equipment is developed by using high efficiency transformer insulating oil filtration and purification equipment, vacuum separation and drying principle, separation engineering and precision filtration technology. It is an ideal equipment for filtration and purification of seriously deteriorated insulating oil.
High efficiency transformer insulating oil filtration and purification equipment is suitable for power plant, power station, power company, power transformation industry, metallurgy, petrochemical, machinery and other industries. It is mainly applicable to the purification of various insulating oil, such as high-voltage transformer, current transformer, capacitor, circuit breaker, oil switch, etc. The equipment can clean the deteriorated transformer, transformer, oil switch and other transformer oil on-line live operation without power failure. It can not only Degas, dehydrate and remove impurities, but also remove impurities, acid value and dielectric loss in insulating oil, and restore the service performance of oil. All of them can be filtered and purified to remove the trace moisture and ensure the safe operation of the transformer.
For more information, please refer to the product catalog and cases on the company's official website. If you need product information and videos, please open the contact information - call or add a telephone wechat.
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