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Low-voltage reactive compensator capable of saving energy of electric arc furnace

A compensation device and electric arc furnace technology, which is applied in reactive power compensation, reactive power adjustment/elimination/compensation, lighting and heating equipment, etc., can solve the unsatisfactory comprehensive parameters of submerged arc resistance furnaces and unresolved reactive power consumption cases. Improve the problems such as large three-phase unbalance coefficient, etc., to achieve the effect of ensuring service life, improving power factor, and compact equipment layout

Inactive Publication Date: 2008-12-24
西安瑞驰电力设备有限公司
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Problems solved by technology

Although this method can achieve the purpose of compensating the power factor of the grid and improve the power factor displayed by the meter at the metering point, the large amount of reactive power consumption on the secondary side has not been improved, resulting in unsatisfactory comprehensive parameters of the submerged arc resistance furnace.
There are disadvantages such as large reactive power loss, large three-phase unbalance coefficient, low electrical efficiency, large power consumption, serious transformer copper loss, serious line loss, and large smelting arc dead zone.

Method used

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  • Low-voltage reactive compensator capable of saving energy of electric arc furnace
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  • Low-voltage reactive compensator capable of saving energy of electric arc furnace

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Embodiment Construction

[0024] According to the specific structure of the electric arc furnace circuit, the present invention arranges the compensation capacitor in parallel near the copper tile, makes the reactive power compensation as close as possible to the electric arc, and compensates the secondary reactance, leakage reactance and short-circuit impedance of the transformer. Automatic control technology is used to detect the reactive power of each phase, and according to the size of the reactive power and the control model that the three-phase power is equal, a corresponding size of reactive capacitor is set to convert the reactive power into active power. This system can not only improve the power factor, but also balance the three-phase power, make the power center, thermal center, and furnace cavity center of the electric arc furnace coincide, and increase the smelting power on the electrode under the condition that the primary side power of the transformer remains unchanged. To achieve the pu...

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Abstract

The invention discloses a low-voltage reactive power compensating device used for saving the energy of an electric arc furnace. The device comprises a three-phase compensating circuit which is respectively connected with the secondary side of a furnace transformer through the short network of a compensating system, the short network of the compensating system is connected with a fast acting fuse and a reactance in series, each phase of the three-phase compensating circuit comprises a capacitor, and a static compensator is composed by connecting the capacitor with the short network of the compensating system through a connecting wire. The device can greatly improve the power factor, and have high production efficiency and low production cost.

Description

technical field [0001] The invention relates to an energy-saving device for an electric arc furnace. Background technique [0002] Electric arc furnaces are mainly used to recycle and utilize social scrap steel to smelt high-grade steel such as stainless steel and heat-resistant steel. The output of electric arc furnace steelmaking in the world accounts for more than 30% of the total steel output. The electric arc furnace for steelmaking is mainly generated by the arc between the three-phase electrodes. A low power factor will result in low electrical efficiency, high energy consumption, low production efficiency, and high production costs, which are unfavorable to the power grid and manufacturers. Usually, power supply departments and manufacturers choose high-voltage capacitor compensation. This compensation method is to connect the capacitor reactive power compensation device in parallel to the three-phase bus on the high-voltage primary side, which can only compensate th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18F27B3/28
CPCY02E40/30
Inventor 白玉龙
Owner 西安瑞驰电力设备有限公司
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