Core:
Oil immersed transformer
Oil immersed transformer is used iron core cutting line ,all inclined ladder joints and improving flux trend to eliminate flux saturation phenomenon of iron core in joints . By doing these, it reduces the no-load loss, no-load current and noise of transformers. Adopting pulling-plank structure, in order to strengthen the ability of withstanding short-circuit, we put many nails around pressing planks and bracing plates are used as support between H.V and L.V yoke, make the iron core be a whole. The iron core sheet are coated by glue which are specialized for silicon steel , so that all silicon steels can be bonded together to make the iron core be integral one, this effectively enhances mechanical strength and plays a positive role in the core anti-rust. The low part of the body and the oil tank are supported through bracing plates adopt” high intensity electric laminated” technology, to guarantee the low part of oil-immersed transformer’s body safe and reliable.
Dry type transformer
The core of dry type transformer is manufactured with high quality cold rolled grain-oriented silicon steel and step overlapping structure is also adopted for the core design. Magnetic circuit structure is improved and the magnetic flux density of steps overlapping joints is lowered. Because of first-class equipments, high quality silicon steel and advanced technology , the no-load capacity is greatly improved. Compared with normal cores, no-load loss, no-load current and noise are respectively reduced by 5-6%, 20-30%, 6%.
Coil:
Oil immersed transformer
Oil immersed transformer’s high-voltage(HV) coil adopts an interleaved-continuous structure, The low-voltage(LV) coil adopts an interleaved-continuous or spiral structure, are independently provided with voltage-regulating winding to balance the ampere turn of each winding-up, effectively lower the mechanical force to minimal level. In the transformer winding, there is a zigzag oil guide structure so as to fully cool all areas inside the winding, lower the temperature rise of the winding and the hot points of the winding and prolong the service life of insulation.
Dry type transformer
HV winding of dry type transformer is casted with high quality epoxy resin at vacuum state with pressure; LV winding is manufactured with high quality foil conductor. Advanced technology guarantee the small partial discharging volume, high capacity of short circuit impendence. The regulation range of H.V winding is Un±5% and Un±2x2.5%, on-load regulation range is wider.
Other Parts
Tank ( for oil transformer)
The tank’s structure of oil-immersed transformer is bell jar type or suspended type, have a good looking and high mechanical strength. It adopts” flanged joint” technology in every key point (such as annular tubes, pressure valves, switches,etc.), which effectively avoid leaking oil.
Casing(for dry transformer)
The tank’s structure of oil-immersed transformer is bell jar type or suspended type, have a good looking and high mechanical strength. It adopts” flanged joint” technology in every key point (such as annular tubes, pressure valves, switches,etc.), which effectively avoid leaking oil.
