As the coils of resin-insulated dry-type transformer are encapsulated by the epoxy resin, they are nonflammable, fireproof, explosion-proof, maintenance-free, no pollution, small volume, and can be installed in the load canter directly, the scientific and reasonable design and casting technology enable the products to have lower discharge capacity, low noise and strong heat dissipation, they are able to run for a long time under 140% rated load under foraed air cooling condition, besides, the products are equipped with intelligent temperature controllers, have functions of trouble alarm, over-temperature alarm, over-temperature tripping and black box,can be connected with the computer through RS485 series interface to realize centralized monitoring and control. |
STRUCTURAL FEATURES |
Iron core |
The iron core is made of imported cold-rolled silicon steel sheets with inclined joint structure, core limbs are bound by unidirectional wattless tape of class F. Surface of iron core is encapsulated with epoxy resin, which reduces the no-load o=current and core noise. Clamps and fasteners have gone through special surface treatment that further improves the product appearance quality. |
High- voltage Winding |
High-voltage winding applies vacuum casting of stuffing epoxy resin which sharply reduces partial discharge and enhances the electric of coils. The inside and outside of the winding is bulk up with glass fiber grid overlay which strengthens the mechanical robustness of coils and product's short-circuit withstand capability, the coil will not split forever. |
High- voltage Winding |
Low-voltage winding applies foil structure which solves the problem of axial? angle? when? winds and make the ampere-turn of winding distribute evenly. Meanwhile, the coils adopt axial cooling duct to improve the heat dissipation. Between the layers of winding, it applies DMD resin preliminary immersed cloth and makes it whole solidification forming, |
Manufacturing process |
The coils are wound on high precision winding machine.We adopt foil type winding structure for low-voltage winding. Transformers of larger capacity are equipped with ventisting duct, it is vacuum drying, casting and solidification folkwed the winding, all processes are operated accord with the technological requirements under strict monitoring and may be regulated as appropriate. The precise manufacturing of casting ensures no bubble or cavity in coil, and gets high quality operation of transformer finally. |
Temperature control and air cooling systems |
It adopts crossflow top-blow fan which is featured with low noise, high wind pressure and good looking, etc,. it improve the safety and reliability if the operation of transformer. |
Protective shell and outgoing bus |
The shell makes further protection for the transformer. For user's option, the grade of protection has IP20, IP23, ect,. Shell material include cold-rolled steal sheets, stainless steal sheets and so on for option. The low-voltage outgoing adopts standard outgoing bus, side outgoing and top outgoing are available, or design special outgoing modes for users. |
Main technical parameters
Service conditions |
Installation height: altitude shall not exceed 1000m Symmetry of multi-phase source voltage: connected voltage of multi-phase transformer should be symmetrical approximately. Ambient temperature: max temperature +40℃ Max daily mean air temperature: +30℃ Max annual mean air temperature: +20℃ Min air temperature: -30℃ applicable for indoor transformers |
Size Slection
