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Insulating Materials for Power Transformers
Various types of insulating materials are used for a wide variety of applications. Aside from electrical insulation, these materials also serve other purposes, including thermal management and moisture protection. Choosing the best insulating materials for your power transformer will not only provide better insulation properties but also increase efficiency and longevity. This will also help you save money on the total cost of ownership.
The insulation of power transformers is monitored by a variety of methods, including acoustic, chemical, and optical spectroscopy. These methods are used to determine the level of arcing activity and depolymerization. The International Electrotechnical Commission (IEC) standardizes these measurements. The American Society for Testing and Materials (ASTM) standards are also used to monitor the performance of power transformer insulation.
The power transformer insulation system can be divided into two categories: the insulating paper and the insulation oil. The paper is made from vegetable fibers felted together. It is then placed in the insulating oil under a vacuum. This process gives the insulating paper a high electric strength.
The oil is obtained by fractional distillation of crude petroleum. The oil must provide sufficient dielectric strength as well as sufficient cooling for the core and coil assembly. It must also minimize the contact between cellulose and oxygen. This is important because cellulose is the main constituent of power transformer insulation paper. If oxygen comes into contact with cellulose, the paper decomposes and methanol is produced. This is also known as a byproduct of the oxidation of the insulation oil.
The use of vegetable oil as an alternative to transformer insulation oil has been studied. This has been shown to have many benefits over mineral oil. However, there are also some limitations. For example, vegetable oil does not dissolve sludge as efficiently as paraffinic oil. It also has a shorter lifespan than paraffinic oil. It is important to conduct a comprehensive analysis of vegetable oil and its compatibility with other components in a transformer. This will also help determine whether vegetable oil can be used as a feasible alternative to transformer insulation oil.
Some other important considerations include the type of oil used in the transformer, the quality of the oil, and the moisture content of the insulating oil. Moisture content can increase the dielectric loss factor tg8, deteriorate insulating properties, and reduce spark discharge voltage. The best insulating oil for use in low-voltage transformers should be free from trace moisture. Trace moisture in insulating oil can cause a decrease in spark discharge voltage and promote the aging of the insulating oil.
The insulating oil in power transformers can also be divided into two categories, paraffinic and naphthenic oil. Paraffinic oil contains a higher percentage of naphthene hydrocarbons. Naphthenic oil, on the other hand, contains a smaller percentage of paraffinic hydrocarbons. Naphthenic oils can also dissolve sludge more effectively than paraffinic oil.
The use of vegetable oil in power transformers has been studied, but further research will be required to determine whether vegetable oil can be a viable replacement for transformer insulation oil. It will also be necessary to study the interactions between vegetable oil and copper components.
Customized 115v 220v 230v PCB Mount Current Transformer
Customized 115v 220v 230v PCB Mount Current Transformer
· Core Type EE20/10.5
· Power - 0.60VA
· Input voltage - 230V or 115V, 50/60Hz
· Insulation class - Class B (130°C)
· Ambient temperature (ta)- 70°C
· Dielectric strength - 4, 500Vrms
·Inherently short-circuit-proof
· Self-extinguishing material
· Potted under vacuum
· Weight: 35g
Medical Motor / Electronic test equipment / National defense and military industry