High and low pressure combined reactive compensation control system for submerged arc furnace

Abstract

The invention relates to a submerged arc furnace control system, in particular to a high and low pressure combined reactive compensation control system for a submerged arc furnace, which comprises a primary side voltage mutual inductor, a primary side current mutual inductor, a secondary side voltage mutual inductor and a secondary side current mutual inductor which are used for acquiring data from a primary high pressure side and a secondary low pressure side of an submerged arc furnace transformer. The primary side voltage mutual inductor and a primary side current mutual inductor are respectively connected with an input port of an electric converter P1, and the secondary side voltage mutual inductor and the secondary side current mutual inductor are respectively connected with an inputport of an electric converter P2; and a main control computer controls a programmable logic controller (PLC) to switch a compensating device, receive and send an alarm signal and receive and execute a temperature guard signal. The high and low pressure combined reactive compensation control system for the submerged arc furnace has the advantages of increasing the yield, improving the degree of automation and improving the human-computer interactive capacity.

Description

technical field [0001] The invention relates to a submerged arc furnace control system, in particular to a submerged arc furnace high and low pressure combined reactive power compensation control system. It can realize the combined operation of high and low voltage reactive power compensation devices of submerged arc furnaces, cycle switching of three-phase unequal compensation capacity and monitoring and alarm of submerged arc furnace operation status, especially suitable for reactive power compensation of submerged arc furnaces with a capacity of 16500kVA and above device. Background technique [0002] The electrical system of submerged arc furnace is mainly composed of high-voltage power supply network, electric furnace transformer, compensator, short network, water cooling system, electrode system, furnace and control system. Its load characteristics are between resistive and inductive, and low voltage and high current The structure and working characteristics of the sh...

AI Technical Summary

Problems solved by technology

However, as the capacity of submerged arc furnaces increases, there are more and more submerged arc furnaces above 30,000kVA. If only a single low-voltage compensation is used, the secondary voltage will inevitably increase too much, the electrode current will decrease, and the arc will elongate. The electrode is lifted up, which makes it difficult to insert the electrode down; in addition, after the effective input power into the furnace increases, the width of the melting reduction zone increases, and when it is close to the furnace wall, the heat loss increases, the furnace condition deteriorates, the high temperature erosion damages the furnace lining, and the furnace life is reduced.

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