What are the compositions of transformer oil, what is the role of transformer oil?

Transformer oil is a kind of mineral oil obtained by distillation and refining in natural petroleum, and is a mixture of liquid natural hydrocarbons with pure and stable, low viscosity, good insulation and good cooling by acid and alkali refining of the lubricating oil fraction in petroleum. Commonly known as square shed oil, light yellow transparent liquid, relative density. Freezing point <-45, specific heat capacity of about Kak*degree) is mainly composed of three hydrocarbons, the main components are naphthenic hydrocarbons (about 80%), and the others are aromatic hydrocarbons and alkanes.

In China, transformer oil includes paraffin-based oil and naphthenic oil. Paraffin-based oil is produced in Daqing, and naphthenic oil is produced in Karamay, Xinjiang.

A good transformer oil should be a clean and transparent liquid, free of sediment, mechanical impurities, suspended solids and batting. If it is contaminated and oxidized, and produces resins and sediments, the transformer oil will deteriorate and its color will gradually change to light red until it becomes a dark brown liquid. When the transformer is faulty, it will also change the color of the oil, and under normal circumstances, the transformer oil is light brown when it is not suitable for use.

In addition, transformer oil can appear cloudy and emulsion-like, black and dark in color. The transformer oil is cloudy and emulsion-like, indicating that the oil contains water. The oil color is dark, indicating that the transformer oil insulation is aging.

The oil is blackened and even smells burnt, indicating that there is a fault inside the transformer.

Why DL T572-95 "Transformer Operation Regulations" stipulates that the oil temperature of the upper layer of the oil-immersed transformer shall not exceed 95:

Generally, the insulation of oil-immersed transformers is mostly made of Class A insulating materials, and its oil resistance temperature is 105. In the national standard, the maximum temperature of the transformer is 40, so the temperature rise limit of the winding is 105-40 = 65 ( ) non-strong oil circulation cooling, the top oil temperature and the winding oil temperature difference is about 10, so the top oil temperature rise is 65-10 = 55 ( ) the top oil temperature is 55 + 40 = 95 ( ) the temperature rise of the top oil in the strong oil cycle is generally not more than 40.

Transformer oil: a mineral oil obtained by distillation and refining in natural petroleum.

The role of transformer oil 1, insulation, transformer oil is a fluid, it can fill any space between the components in the transformer, to avoid the reduction of insulation caused by moisture in contact with the air. Because the transformer oil has higher insulation strength than air, it can maintain good insulation between the windings, between the windings and the core, and between the windings and the oil tank shell, which increases the insulation strength of the transformer.

2. In operation, the heat generated by the loss in the core and winding increases the temperature of the transformer oil, expands the volume, and rises because of its specific gravity. The oil circulation cools the windings and core, improving operating conditions.

3. Arc extinguishing effect, in addition to the role described above, transformer oil can also play a role in accelerating the arc extinguishing in the transformer shell in a special operating state.

The oil in the transformer mainly plays the role of heat dissipation and cooling during operation; It plays the role of insulation and insulation maintenance for windings (maintaining good insulation status); The oil acts as arc suppression at the high-voltage leads and tap changer contacts, preventing corona and arc discharge.

The role of transformer oil, 1Enhance the dielectric strength of transformers. 2.The temperature inside the transformer is lowered by means of a radiator.

Transformer oil mainly plays the role of cooling medium, but also has an insulating role.

Insulating effect. Transformer oil has a much higher dielectric strength than air.

Heat dissipation. Transformer oil has a high specific heat and is often used as a coolant.

Arc suppression. On on-load regulator switches in oil circuit breakers and transformers, arcing occurs when the contacts are switched.

Hello dear. Other uses of transformer oil are as follows: 1. Insulation, which plays the role of insulation and insulation maintenance for windings.

2. It can be used as a coolant. 3. Arc suppression, transformer oil plays an arc suppression role at the high-voltage lead and the contact point of the minute ruler guess base Zhaodong switch to prevent corona and arc discharge; 4. Transformer oil is widely used as a liquid seal in the hydraulic safety valve. If my answer is helpful to you, please give a thumbs up (comment on the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the driving force for my progress.

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Transformer oil is petroleum oil, and transformer oil is a fractionated product of petroleum. The main components are compounds such as alkanes, naphthenic saturated hydrocarbons, aromatic unsaturated and hydrocarbons. Commonly known as square shed oil, light yellow transparent liquid, relative density. Freezing point<-45.

The main functions of transformer oil: (1) Insulation: transformer oil has much higher dielectric strength than air. The insulating material is immersed in oil, which not only improves the dielectric strength, but also protects it from moisture.

2) Heat dissipation: The specific heat of transformer oil is large, and it is often used as a coolant. The heat generated during the operation of the transformer makes the oil close to the core and winding expand and rise by heating, and through the convection of the oil up and down, the heat is dissipated through the radiator to ensure the normal operation of the transformer.

3) Amusement and compass effect: On the on-load voltage regulating switch of oil circuit breaker and transformer, arc will be generated when the contact is switched. Due to the good thermal conductivity of transformer oil, and under the action of high temperature of the arc, a large amount of gas can be contacted, resulting in a large pressure, which improves the arc extinguishing performance of the medium and makes the arc extinguish quickly.

The transformer body is installed in the oil tank, which is filled with transformer oil. Transformer oil is a mineral oil with good insulation properties, which plays two roles: one is to insulate between the transformer winding and the winding, the iron core and the oil tank; Second, the transformer oil generates convection after heating, which plays a role in heat dissipating the lead core and windings of the transformer.

There are a lot of cooling oil pipes in the oil tank to increase the cooling area. In order to speed up heat dissipation, some large transformers use internal oil pumps to force oil circulation, external transformer fans to blow air or tap water to spray transformer oil tanks, etc. These are the cooling methods of the transformer.

1) Insulation capacity: the higher the better.

2) Viscosity: the smaller, the better.

3) Freezing Point: The lower the better.

4) Flash Point: The higher the better.

5) Specific gravity: the smaller, the better.

6) Ash, acid, salt and other impurities: the ash content shall not exceed 1/10,000 of the leakage, and other impurities shall not exist.

7) Acid value: the lower the better.

8) Stability: The higher the better.