At the beginning of the year, the issue of rising prices of raw materials based on steel led to hot discussions in the industry. Many lighting companies are beginning to worry about the production cost pressure at the beginning of the year. According to the reporter's understanding, the previous increase in steel prices was not caused by the increase in market demand, but the increase in the prices of steel raw materials such as iron ore and scrap iron. With the impact of the Spring Festival holiday, the normal trading day of the steel market in February was significantly reduced, and the resource digestion rate slowed down.
Material price fluctuations are obvious, companies need to be wary of cost pressure
It is also known that, driven by the earthquake in Chile, domestic copper prices have risen sharply since March 1. According to official Chilean statistics, the country's copper output in 2009 reached 5.486 million tons, accounting for about 35% of global copper production. As Chile's copper reserves, production and exports rank first in the world, the earthquake has suspended many copper mines in the country. Market analysts generally expect copper prices and some non-ferrous metals based on copper. Prices will also rise sharply.
Resistance furnace transformer
Electric resistance furnace and salt bath furnace for heating, heat treatment of mechanical parts, powder metallurgy sintering, non-ferrous metal smelting, etc. Because the resistance of the heater is too small, or the resistance of the heater changes too much during the heating process, a resistance furnace transformer needs to be equipped between the furnace and the power grid to reduce and adjust the input voltage of the furnace.
The resistance furnace transformer and salt bath furnace transformer with small capacity and low voltage are mostly dry-type transformers, with a box shell and natural cooling; Resistance furnace transformers with medium capacity (hundreds to thousands of volt amperes) are mostly oil immersed self cooling transformers; Large capacity is forced oil circulating water-cooled transformer.
A special transformer used to supply power to electric arc furnaces for iron and steel smelting. Large capacity, complex structure and high technical requirements. Its secondary side voltage is low, generally from tens of volts to hundreds of volts, and it is required to be adjustable in a large range; The secondary side current often reaches thousands to tens of thousands of amperes. In addition, in iron and steel smelting, large power is required during the melting period, and the transformer is required to have 20% overload capacity within 2 hours. In the process of steelmaking, electrode short circuit is easily caused by the collapse of furnace charge, so the primary side of the electric arc furnace transformer should be connected to the current limiting reactor in series or have a large impedance to limit the short circuit current.
Special transformer for intermediate frequency furnace
The special transformer for medium frequency furnace produced by the company is applicable to medium frequency electric furnace below 30 tons. The rated voltage at the primary side can be divided into 10KV or 35KV. The rated voltage of the secondary side can be divided into: 400V, 600V, 660V, 690V, 700V, 720V, 750V, 800V, 850V, 900V, 950V, 1000V, 1050V, 1100V, 1250V, etc. Rectification mode can be divided into 6 pulse, 12 pulse, 24 pulse or more. The current popular rectifier string, inverter string, rectifier parallel, etc
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