Star connection method of ore furnace secondary low-voltage compensation device system

Abstract

The invention relates to a start connection method for a secondary low-voltage compensating device and a system of a submerged arc furnace. The submerged arc furnace is an important smelting device in the metallurgical industry, the power consumption is high, an electrical system for the prior submerged arc furnace to conduct smelting mainly comprises a high-voltage power supply network, a transformer of a transformer station, a primary side power supply network of an electric furnace, a high-power electric furnace transformer, a low-voltage and heavy-current short network system, a water cooling cable, an electrode system, a heart and the like, smelting current of the electric furnace causes the phenomena of voltage flicker and current impulse and causes distortion of voltage and current waveform of the smelting system, so that the line loss and the loss of the electric furnace device are increased, and the quality of electric energy is reduced. The invention further comprises a compensating capacitor connected in parallel at two ends of a secondary side short network of an electric furnace, the compensating capacitor is added on a node, the exchange for a capacitor has idle work, the idle work generated by the electric arc does not flow through the short network, the electric furnace transformer and the primary side, the pathway is simple and short, the loss is reduced, and the local compensation is realized. Therefore, the operating reliability of the device can be effectively improved.

Description

technical field [0001] The invention relates to energy-saving equipment applied to the submerged arc furnace smelting system in the metallurgical industry, and is particularly suitable for the connection method of the secondary low pressure compensation device of the submerged arc furnace. Background technique [0002] The submerged arc furnace is an important smelting equipment in the metallurgical industry. It consumes a lot of electric energy, which can reach up to 70% of the production cost of the enterprise's products. Reducing the energy consumption of electric furnaces and improving the comprehensive energy efficiency of electric furnaces is of great significance to metallurgical enterprises. Such as figure 1 As shown, the electrical system of submerged arc furnace smelting is mainly composed of high-voltage power supply network, substation transformer, electric furnace primary side power supply network, high-power electric furnace transformer, low-voltage and high-c...

AI Technical Summary

Problems solved by technology

The smelting current of the electric furnace contains fast, irregular and instantaneously changing reactive power and high-order harmonics, which cause voltage flicker and current impulse phenomenon, cause voltage and current waveform distortion of the smelting system, and increase line loss and loss of electric furnace equipment , which reduces the power quality and its main defects have the following deficiencies:

Due to the impact of surge and impulse current, the temperature of the transformer rises, and the temperature of the electric furnace transformer increases by 1 degree, and the energy consumption increases by about 4%.

For the electric furnace smelting system, due to the long-term impact of the impulse current, the contact parts will form an oxide layer, which increases the contact resistance, and every increase of 1 ohm contact resistance will result in a loss of 13% of the efficiency of electric energy.

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