A dry-type transformer is a transformer that is cooled by natural air without relying on other cooling media. Simply put, a dry-type transformer refers to a transformer whose iron core and windings are not immersed in insulating oil.
The structure of a dry-type transformer
A dry-type transformer is mainly composed of an iron core made of silicon steel sheets and coils cast with epoxy resin. An insulating cylinder is placed between the high-voltage and low-voltage coils to increase electrical insulation. The coils are supported and restrained by spacers, and the fasteners for the overlapping parts of its components all have anti-loosening properties.
The cooling methods of a dry-type transformer
The cooling methods of a dry-type transformer are divided into natural air cooling (AN) and forced air cooling (AF). When using natural air cooling, the transformer can operate continuously for a long time at its rated capacity. When using forced air cooling, the output capacity of the transformer can be increased by 50%.
The overload capacity of a dry-type transformer
The overload capacity of a dry-type transformer is related to the ambient temperature, the load condition before overload (initial load), the insulation and heat dissipation condition of the transformer, and the heating time constant, etc.
The functions of a dry-type transformer
It is safe, fireproof and pollution-free, and can be directly operated in the load center.
It has low loss and low noise, with obvious energy-saving effects.
It has strong short-circuit resistance, small partial discharge, good thermal stability, high reliability and a long service life.
A dry-type transformer can be equipped with a complete temperature detection and protection system. Using an intelligent signal temperature control system, it can automatically detect and circularly display the working temperatures of the three-phase windings respectively, automatically start and stop the fans, and has function settings such as alarms and trips.
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