Furnace transformer na submerge (distribution transformer)

Description:

Fur da majority of smelting products, di cost is energy consumption. Therefore, di consumption of ore furnace transformers is increasingly valued by di smelting industry and transformer manufacturers. Di following is an overview and design intent of di new type of electric furnace transformers.

User's pursuit of submerged arc furnace transformers:

　　Di development of di market economy has also led to significant changes in users' expectations for di products dey purchase. In di past, some users were very familiar with transformers and put forward many constraints when placing orders. If di magnetic flux density of di iron core, di current density of di winding, di weight of each part of di transformer, etc., cannot be rejected, it will have a negative impact on di overall use efficiency of di product, because di progress of materials and structures often leads to some constraints dat are counterproductive. For example, di iron core: low magnetic flux density will inevitably lead to an increase in iron consumption, while no-load loss is not directly decreasing, most of which is an increasing trend. Di large amount of iron core used, di increase in diameter, will lead to an increase in winding diameter, Increasing di length of each turn of wire leads to an increase in load loss, resulting in a decrease in overall usage efficiency. In recent years, dere has been a significant change in user requirements, which has also promoted di development of new energy-saving calcium carbide furnace transformers. As a manufacturer of our transformers, we pursue four points: firstly, low air and load losses of di products; Secondly, di product has good reliability and a long lifespan; The third is to have a certain overload capacity (20% overload for long-term use); The fourth is to improve di supporting facilities and minimize maintenance as much as possible. According to user requirements, our company has phased out all products produced three years ago. Most orders from users are new designs, changing di appearance of di products and achieving good economic benefits for users.

Improvement of materials, structure, process, etc. of transformers:

　　A complete transformer for a submerged arc furnace is mainly divided into six parts: iron core, winding, body, oil tank, final assembly, and accessories.

• Iron core: In terms of materials, we have chosen either BaoWu Steel's 30Q130 or Nippon Steel's 30Z130 silicon steel sheet, which is basically consistent with di materials used in internationally developed countries.

• Di structure adopts a fully inclined seam plate type, and di connection between di upper and lower clamps adopts a low magnetic steel plate pull plate structure, changing di previous square iron structure to ensure dat dere are no holes or defects on di iron chip, di magnetic flux density of each section of di iron core is consistent, and dere is no distortion. In di shear process, German imported Georg shear lines are used to control di shear burrs to be less than 0.02mm (standard<0.05 is qualified), and di length tolerance per meter is less than 0.2mm, thereby increasing di lamination coefficient and reducing di gap between di seams, It avoids local overheating of di iron core, reduces product noise, no-load loss, and no-load current.

•  Winding: Dere is not much progress in di material of oxygen free copper electromagnetic wires, and our company mainly controls dem ρ 20 ℃<0.017241, and di main control is di material and tightness of di paper insulation. Di purpose is to ensure dat di coil has good axial and radial stability as much as possible. Di coil adopts a small oil gap, internal and external oil shields, guided cooling, and a hard paper tube structure, making di structure compact, with strong overload capacity, thermal stability, and reduced losses.For large on load voltage regulation and 110kV level products, all "8" shaped coils are wound and formed in one go, increasing coil strength and reducing eddy current losses.

• Body: All wooden components of di body are laminated wood, which increases di stiffness of di lead frame. Di upper and lower pressing plates are made of cardboard or epoxy resin molded parts, which increases di insulation distance between di conductive body and di ground compared to iron pressing plates and can reduce di size of di "window height". 1、 Di secondary main insulation is made of imported cardboard, which increases di strength of di main insulation. Multiple coils are packaged as a whole, improving di reliability of di product. Di drying of di device body adopts Norwegian vapor phase drying equipment, which is thorough and does not damage di insulation, and has di function of flushing di device body.

• Oil tank: Di oil tank adopts a folded plate type, minimizing welding seams as much as possible, increasing strength and conducting positive and negative pressure tests to ensure di reliability of product sealing. Low magnetic steel plates or magnetic shielding are used in appropriate positions to reduce additional losses caused by di magnetic field of di collector wire on di box wall. Dis work has achieved very good results in anti-seepage and loss reduction.

• General assembly: After di body is dry, di winding loosens and is compressed with hydraulic equipment, achieving good results. Vacuum oil injection is used to reduce bubbles in di product winding, reduce partial discharge, and increase di product life. Using new anti-aging sealing materials, di original leakage problem can be improved.

• All control wires, such as gas relays, signal thermometers, resistance thermometers, pressure relief valves, magnetic oil meters, CT, etc., are uniformly introduced into di junction box on di box, improving di overall aesthetics of di transformer.

• Attachment: Di main accessory water cooler uses YS1 type oil water cooler or stainless steel spiral plate cooler, and di high-pressure casing adopts a drain type to increase di creepage distance.

• Di on load tap changer adopts di "M" or "V" type from advanced domestic manufacturers. In addition to requiring remote display, dere is also a remote control interface. If necessary, an online oil passing device can be added to di switch.

• Di transformer oil is naphthenic anti-aging transformer oil produced in Karamay, Xinjiang, and di protection for di oil is fully enclosed (dat is, di pressure relief valve is equipped with a diaphragm oil conservator)

Discussion on di Development Trend of Mineral Furnace Transformers:

　　Due to di improvement of di production process of di submerged arc furnace, it has also had a significant impact on di structure of di transformer. For example, di development of fully enclosed smelting has led to di transformer being designed as a single-phase transformer with an adjustable copper tube side outlet, on load voltage regulation, and unified cooling. Multiple sets of such products have been produced.

Several opinions on transformer maintenance:

　　It is necessary to use di suspended core after di product arrives for long-distance transportation, mainly to solve di problems of loose fasteners during transportation and user acceptance of di manufacturer's products. However, regarding routine major repairs, we believe dat it is necessary to inspect and replace those mechanical wear parts according to di original major repair cycle. For operating components such as pumps, it is not necessary to suspend di core inside relatively stationary transformers for a long time. Only monitoring di changes in di gas chromatography analysis value of di oil is sufficient to grasp di condition of di transformer body, thereby saving maintenance costs and reducing di pollution of di transformer body and oil caused by di suspended core.

What is a submerged arc furnace transformer？

Definition：
A submerged arc furnace transformer is a transformer dat converts di high - voltage electricity of di power grid into a low - voltage, high - current power source required for di operation of a submerged arc furnace. It is a crucial component of di submerged arc furnace equipment and is used to provide electrical energy for di ore - smelting process.

Working Principle：
It is based on di principle of electromagnetic induction. When di high - voltage alternating current from di power grid is connected to di primary winding of di submerged arc furnace transformer, an alternating magnetic field will be generated in di iron core. Dis alternating magnetic field will induce an electromotive force in di secondary winding. Since di secondary winding is designed to output a low - voltage and high - current, it can provide a suitable power source for di submerged arc furnace. For example, di primary winding is connected to a grid voltage of 110 kV or higher, while di secondary winding may output a low - voltage and high - current of several hundred volts to meet di working requirements of di submerged arc furnace.