Electroslag furnace thyratron transistor low-frequency heating and smelting apparatus

Abstract

This invention relates to a low frequency heating smelt device for a thyristor electroslag refining furnace, in which, an output end of a bridge full control commutating circuit composed of thyristors of Th1í»-Th6í»is parallel inversely on an output of a bridge full control commutating circuit composed of thyristors of Th1-Th6 to be parallel on a self-cost electrode and a crystallizer of a electroslag heavy melting furnace via a short net, which is advantaged that since the electroslag furnace uses the single phase load, if an electromagnetic transformer is used to change the three- phase to single or a single phase is used directly, the three phase voltages at the net side will be seriously unbalance to break the supply quality and the operation of low frequency supplier does not influence the three-phase voltage of the net side.

Description

technical field [0001] The invention relates to an electroslag furnace thyristor low-heating smelting device used for heating and smelting in an electroslag remelting furnace, and belongs to the technical field of frequency conversion devices. Background technique [0002] In the past, the single-phase 50Hz power supply was used, or the three-phase electric energy was converted into single-phase electric energy through the special connection of the secondary winding of the electric furnace transformer, all of which caused a serious unbalance of the three-phase voltage on the grid side, resulting in a large zero-sequence current, causing the grid The power supply quality is degraded, and the power supply department is generally not allowed to use it; moreover, the loss is large, the efficiency is low, and it will also cause the steel components around the short network magnetic field to heat up, and the energy consumption is very large. Contents of the invention [0003] Th...

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Problems solved by technology

[0002] In the past, the single-phase 50Hz power supply was used, or the three-phase electric energy was converted into single-phase electric energy through the special connection of the secondary winding of the electric furnace transformer, all of which caused a serious unbalance of the three-phase voltage on the grid side, resulting in a large zero-sequence current, causing the grid The power supply quality is degraded, and the power supply department is generally not allowed to use it; moreover, the loss is large, the efficiency is low, and it will also cause the steel components around the short network magnetic field to heat up, and the energy consumption is very large

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