A transformer is an electrical device made based on the principle of electromagnetic induction. It is widely used in power systems and electronic circuits, and is also an indispensable electrical equipment in measurement systems.
Transformer is a very common electrical equipment. According to their different uses, they can be divided into two categories: power transformers and special transformers.
Dry-type transformer refers to a power transformer in which the core and coils are not immersed in insulating liquid (insulating oil). It is mainly composed of an iron core composed of silicon steel sheets and a coil cast by epoxy resin. An insulating cylinder is placed between the high and low voltage coils to increase electrical insulation, and the coils are supported and restrained by pads.
Transformer is one of the important equipment for transmitting electric energy. The quality and reliability of transformer are directly related to the safe and reliable transmission of electric power. Damage to power generation transformers and key substation transformers will affect power transmission, and repairs and round-trip transportation of these transformers often take several months.
During this period, power transmission will be affected, which will also affect the normal supply of industrial and agricultural production and people's daily electricity, causing great losses to the national economy.
As the requirements for safe and reliable operation of transformers are increasing, transformer detection technology has also developed accordingly in the past 20 years. For example, short-circuit tests at rated voltage of large transformers, partial discharge measurement and positioning technology, transfer functions are used to indicate impact damage to transformers, digital technology is used for loss measurement, sound intensity methods are proposed for noise measurement, and spectrum measurements are used for Deformation diagnosis of transformer windings and chromatographic analysis of transformer oil are increasingly used.
