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Wolong Electric Yinchuan Transformer Co., Ltd. was established in 1968 and is located in the Xingqing Science and Technology Park in Yinchuan City, Ningxia Hui Autonomous Region. It is a key backbone enterprise in Ningxia and a member unit of the Transformer Industry Association. It covers an area of 200 acres and has a modern factory of 80,000 square meters with an annual production capacity of 18 million kVA. The company specializes in the research and development of various transformers with voltage levels below 500KV and capacities below 500MVA, including power main transformers, traction transformers, electric furnace transformers, rectifier transformers, mine transformers, distribution transformers, European-style box substations, American-style box substations, Chinese-style box substations, and container substations, etc. There are hundreds of varieties and specifications. Products are widely used in high-speed railways, electrified railways, national grids, the top five and sixth power generation groups, new energy power stations, energy storage charging, petrochemicals, coal, steel smelting, water conservancy and hydropower, public utilities and other industries. The company is the mainstream supplier of the national railway group, a qualified supplier of the national grid, and a qualified supplier of the top five and sixth power generation groups. It has now developed into a comprehensive service solution provider integrating transformer manufacturing, power equipment integration, EPC general contracting, and power system operation and maintenance. Products and engineering performance are distributed in more than 30 provinces, municipalities, and autonomous regions in China and are exported to more than 50 countries and regions in Asia, Africa, and Latin America.

Product introduction: Transformer A device that uses the principle of electromagnetic induction to change the alternating voltage, consisting of a primary coil and a coil. When alternating current flows through the primary coil, it will produce an alternating magnetic field in the iron core, and then induce an electromotive force in the secondary coil. changing the turns ratio of the coil, the voltage can be increased or decreased. Strong overload capability: Able to cope with over-load transient large current operation conditions;Strong short-circuit resistance: In the event of a short-circuit fault, it can protect the transformer from damage; Low temperature rise: In the event of-load, it has good heat dissipation, ensuring the life and safety of the equipment; Low loss: The energy loss during the energy conversion process is small, improving the energy; Low noise: The noise generated during operation is low, which is conducive to environmental protection. 

Structural features

(1) Transformer iron

The core is made of high-performance electrical steel, cut by a shear line imported from Switzerland, with a burr of less than 0.0 mm at the cut, and adopts a non-laminated yoke process and a plate-type clamping structure, which effectively reduces the transformer's no-load loss and the mechanical strength of the core. The core can adopt single-phase double-column, single-phase three-column, three-phase three-column, three-phase fivecolumn and other structural forms.

(2) Transformer winding

The high voltage winding is wound by high density paper insulated compound conductor, and the low voltage winding is wound by self-adhesive interleaving conductor The winding span is designed with “0” margin, and the densification treatment of the pad block is adopted to enhance the mechanical strength and short-circuit resistance of the winding The oil flow guide structure is arranged inside the winding to improve the oil flow path and velocity, reduce the temperature rise at the hottest point of the winding, slow down the insulation aging, and extend the service life of the transformer.

(3) Transformer core body

The transformer body uses an overall suit process, with all windings dried separately, adjusted in height and shaped before secondary drying, ensuring that the coil height is uniform and consistent, and improving the ability to resist short circuits. After assembly, a vapor phase drying process is performed, which has a higher drying efficiency and cleanliness.