Electroslag furnace thyratron transistor low-frequency heating and smelting apparatus

A low-frequency heating and thyristor technology, applied in the field of frequency conversion devices, can solve the problems of low efficiency, high energy consumption, and reduced power supply quality of the power grid.

Inactive Publication Date: 2006-05-03
朱兴发 +1
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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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  • Electroslag furnace thyratron transistor low-frequency heating and smelting apparatus

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Embodiment Construction

[0006] Referring to the accompanying drawings, its structure is to reversely connect a thyristor Th 1 ~Th6 1 The output end of the composed bridge type fully controlled rectification circuit is then connected to the consumable electrode and crystallizer of the electroslag remelting furnace through a short network.

[0007] The low-frequency power supply is low-voltage and high-current system, when the three-phase power frequency voltage U A , U B , U C When the power is 90V and the power is 3000KW, the output current of the secondary side of the electric furnace transformer is 27200A. It can be seen that the minimum electromagnetic induction design of the conductor and the optimal design of the short network are important ways to improve the electrical efficiency. The low-frequency conversion heating and smelting device of the utility model provides an energy-saving and environment-friendly product with low energy consumption and no grid pollution for the electroslag remelt...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/06H05B6/00
Inventor 朱兴发俞松尧
Owner 朱兴发
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