Metal casting hot working technology covers a variety of materials, iron, aluminum, lead, tin, copper and other metals and various alloys, metal casting hot working technology from the original extensive production mode, upgraded to precision production control line, product quality greatly improved, the production process is also more environmentally friendly.
However, due to the use of resistance furnaces, heat treatment furnaces, electric arc furnaces, intermediate frequency furnaces and other electric furnaces in metal heat treatment heating and insulation, cooling and assembly lines use inverter pumps, motors, etc. as nonlinear load equipment, which inevitably brings harmonics and causes many adverse production effects. For example, it causes capacitor oscillation, so that the capacitor compensator (capacity 1.1MVar) is closed and jumps and cannot be put into use; Affecting the heating process, the heating performance of the heat treatment device cannot achieve the expected effect, and the heating speed is extended exponentially; Causing multiple unexplained damage to sensitive measurement and control equipment; It affects the safe operation of the transformer and causes hidden dangers in power supply safety.
The main loads of the steel industry include:
1. All kinds of alternating and alternating frequency rolling mills
2. All kinds of roll loads
3. Lifting systems of intermediate frequency furnaces, electric arc furnaces, converters, oxygen guns, electric welding machines, pressure welding machines
4. Molten steel delivery vehicles
Harmonic currents are generally dominated by 5th, 7th, 11th and 13th degrees, and if the system has a large number of single-phase harmonic sources, the harmonic current also includes 3rd harmonics.
The main loads of the metallurgical industry (especially the non-ferrous metallurgy industry) include:
Various rectifiers and electrolysis equipment
The harmonic currents are mainly 5th, 7th, 11th and 13th.
High-power DC speed regulation equipment and other loads generate a large amount of harmonic current, which affects the normal operation of various electrical equipment, causes additional losses in power supply lines, and even resonates with capacitors in the power grid; Moreover, the power factor of the speed regulating load such as the DC rolling mill is very low, the reactive power fluctuation is serious, and the traditional reactive power compensation device (capacitor cabinet) cannot be put into operation normally because it cannot resist and eliminate the interference of harmonics, and the waste of electric energy is serious. Even if the capacitor cabinet can be put into operation, it will burn the insurance and burst the capacitor in a short period of time, which is very dangerous.
Intermediate frequency furnaces, rolling mills, electric arc furnaces and other equipment commonly used in the steel industry will have a significant impact on the power quality of the power grid, so that the overload protection action of the capacitor compensation cabinet is frequent, the transformer and power supply line are seriously heated, the fuse is fused frequently, etc., and even causes voltage drop, flicker.
The existence of power quality problems has brought serious harm to the iron and steel metallurgy industry, for this reason, Bowo provides a complete set of solutions, as follows:
| No. | Power Quality Problem | Solution |
| 1 | Low power factor, high reactive power demand | BW-SVG BW-LC BW-TSVG BW-UPQC BW-TSF BW-HFC |
| 2 | Harmonic | BW-APF BW-TAPF BW-LC BW-UPQC |
1. BW-SVG is used in a high-line rolling production line project
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