Secondary low-voltage compensation apparatus for improving submerged arc resistance furnace power factor

Abstract

The invention discloses a secondary low-voltage compensating device used for improving the power factor of a submerged-arc resistance furnace. The device 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 a 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 line. 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 industrial electric furnace, in particular to a secondary low-voltage compensation device for a submerged arc resistance furnace. Background technique [0002] The load characteristics of the submerged arc resistance furnace are between resistive and inductive, and the reactive power is mainly generated by the arc between the three-phase electrodes. The low power factor will cause low electrical efficiency, high energy consumption, low production efficiency, and high production costs. , which is very detrimental 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 the primary-side reactance of the transformer. Although this method can ach...

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Problems solved by technology

[0004] 2. The three-phase unbalance coefficient is large

Due to the limitation of objective conditions, the three-phase short network layout of the submerged arc resistance furnace is generally unbalanced in the spatial structure, and there are strong and weak phases during smelting;

[0005] 3. Low electrical efficiency

Due to the low power factor, the utilization rate of electric energy decreases, and the electrothermal conversion efficiency is low, which directly leads to low output, high power consumption, and low production efficiency;

[0006] 4. High power consumption

The submerged arc resistance furnace is a facility that consumes a lot of power, and the low power factor directly leads to a large increase in power consumption;

[0007] 5. The implementation of reactive power compensation on the high-voltage side or medium-voltage side of the electric furnace transformer has limitations

[0009] 7. Transformer copper loss is serious

The power before compensation is generally only 0.84, the reactive current is large, and the heat is serious, so the line loss is large

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