The main insulating material of baoding oil - immersed transformer is transformer oil. Transformer oil is a high-quality mineral oil extracted from petroleum. More than 95% of its main components are hydrocarbons (hydrocarbons), and the rest are non-hydrocarbon compounds. Hydrocarbons are mainly alkanes, cycloalkanes and aromatic hydrocarbons, while non-hydrocarbon compounds are mainly composed of sulphides, oxides and ammoniates.
The main function of transformer oil is insulation and heat dissipation.
(1) the insulation. The electrical strength of pure transformer oil is very high, many times higher than that of air. Therefore, insulation with transformer oil can increase the insulation strength between various parts of the transformer, so as to maintain good insulation between windings and windings, windings and iron cores, windings and oil tanks, and reduce the volume of the transformer. Better results can be obtained if it is used with solid insulation. For example, the insulation between transformer windings of 110kV and above voltage level is usually divided into several smaller oil gaps between the windings by insulated paper tubes immersed in oil and by support strips or corrugated board, forming an insulating structure composed of thin insulated paper tubes and small oil channels. The higher the voltage level, the more paper tubes are used. When the voltage level is low, such as 35kV and below, the winding can also be used between the oil and plastic paper barrel composed of thick paper simple oil channel insulation structure. Transformer oil is a fluid that is easy to flow. It can fill the gap between various parts of the transformer to eliminate air and prevent the insulation strength of windings and other solid insulation parts from being damped due to contact with air. In addition, transformer oil flow is good, after breakdown, insulation strength can be restored, will not leave a permanent discharge channel, after filtering can continue to use.
(2) heat dissipation. Transformer oil has high specific heat and good fluidity. It can take away heat by convection. Specifically is the transformer running process, iron loss and copper loss will eventually in the form of heat release in the core and winding, the surrounding oil heating, temperature, volume will expand, relative density is less, hot oil will rise, after cooling, then fell to the bottom of the tank, oil was formed by convection. In the process of convection, the oil transfers heat to the cooling device, thereby cooling the windings and the iron core. In order to make the oil circulation more smooth, oil channels are usually left between windings and iron cores, windings and windings as well as inside windings according to needs. Forced oil circulation guided cooling and other methods are also adopted in large-capacity transformers to enhance the cooling effect.
In addition to insulation and heat dissipation, transformer oil can also reduce the oxidation degree of some internal parts of the transformer, thus extending the service life of the transformer. The oil in the on-load tap switch also plays an arc extinguishing role.
Baoding zhongyi electric material manufacturing co., ltd. is a professional transformer manufacturer in baoding transformer factory, with professional production equipment, lifting, tooling and testing equipment, established a perfect quality management system, product performance indicators have reached the standard.
The company's main products: baoding dry transformer, baoding box transformer, baoding oil-immersed transformer, baoding high and low voltage complete sets of equipment. I companies to follow "detail decides success or failure, honesty molded the future" of the enterprise purpose, adhere to "quality measuring market, seek development by innovation, to management for efficiency" business philosophy, to make my company's products are widely used in power plant, chemical, construction, mining, metallurgy, rail transportation and other industries, to meet the needs of various users, my company rely on superior product quality, thoughtful service, won the trust of our customers.
