Electric Arc Furnace Short Network | Heavy Current Line
EAF Short Network (heavy current line) is the general name of the connection application part of the secondary circuit in the main circuit of an electric arc furnace, also known as a high current line.
Short network refers to the high current carrying fluid from the low-voltage side outlet end of the electric furnace transformer to the electrode end, mainly including the compensator connected with the low-voltage side outlet end of the transformer, rectangular copper bar or conductive copper pipe, flexible cable, conductive copper pipe on the conductive cross arm or ordinary electrode arm, graphite electrode and the connecting parts between the above sections, such as fixed connecting base, movable connecting base, electrode holder and other parts.
Short network is an important part of electric arc furnace, and with the increase of electric arc furnace capacity and ultra-high power, the importance of short network is becoming more and more prominent The biggest characteristics of the short network are the short length and high current.
Generally, the development length of the short network of steel smelting electric arc furnace is about 20 ~ 30m, but the current flowing through it is very large, generally tens of thousands of amps. For large submerged arc furnaces, calcium carbide furnace, and other arc furnaces, the current value will be greater.
Due to such a huge current flowing through the short network conductor, the resistance of the short network conductor is bound to consume a considerable amount of active electric energy.
At the same time, the current establishes a strong alternating magnetic field around the conductor, and the alternating magnetic flux will inevitably produce self-induced electromotive force and mutual inductance electromotive force in the short network conductor.
On the one hand, the induced electromotive force offsets part of the power supply voltage and reduces the arc power; On the other hand, due to the inevitable asymmetry of short network conductors, the current is unevenly distributed along each conductor, and power transfer occurs between conductors and between phases, resulting in unequal three-phase arc power, resulting in uneven melting of furnace charge and uneven burning loss of furnace lining, reduction of furnace productivity, etc., which seriously affects the operation index of the whole electric arc furnace.
Due to the large current, there is a large electric force between the short network conductors proportional to the square of the current. Especially in the melting period, the current fluctuates greatly, and the impact force of mutual attraction and repulsion between the short network conductors is large, resulting in the shaking of the short network conductors, the easy loosening of the contact, the heating of the contact resistance, the oxidation and damage of the contact, and the cable swing and mutual friction damage the cable insulation.
Due to the high ambient temperature and dust of the short net, the insulation between the short net conductor and the furnace body is easy to be damaged. Once the short network fails, it will inevitably lead to the hot shutdown of the electric arc furnace, increasing the heat loss and reducing productivity.
Therefore, whether designers or users should pay enough attention to the short networks, pay full attention to the two aspects of the short net's electrical parameters and reasonable short net structure, we should pay attention to the design and selection of reasonable electrical parameters of short nets, so as to improve the technical and economic indexes of the equipment, ensure the advanced technology, and fully pay attention to the mechanical structure of the short net conductors, develop and select new reliable short net components, and adopt a reasonable short net structure. To ensure the reliable operation of the equipment.
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