An electronic voltage regulating electric furnace transformer

A technology of electric furnace transformer and electronic voltage regulation, which is applied in the direction of conversion equipment for intermediate conversion to DC, conversion equipment for conversion to DC without intermediate conversion, etc., which can solve the problem of difficult control of output voltage quality and large number of taps, etc. problems, to achieve the effect of improving realizability, improving production quality and reducing loop current

Active Publication Date: 2018-02-23
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides an electronic voltage-regulating electric furnace transformer, the purpose of which is to solve the technical problems in the prior art that the electric furnace transformer has a large number of taps and the quality of the output voltage is difficult to control

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  • An electronic voltage regulating electric furnace transformer
  • An electronic voltage regulating electric furnace transformer
  • An electronic voltage regulating electric furnace transformer

Examples

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Embodiment 1

[0071] The system connection relationship of embodiment 1 is as Figure 8 As shown, the scheme of using a three-winding transformer to increase the coarse voltage regulation function; in this embodiment, the electronic voltage-regulating electric furnace transformer (1) is a three-phase structure, consisting of three three-winding voltage-regulating transformers (6), and three converters (4 ) and 1 AC-DC converter (3); 3 three-winding voltage-regulating transformers belonging to the ABC three-phase, the primary side is connected to the phase power supply, and the control winding is connected to the DC side of the phase converter through the AC-DC converter. The working winding supplies power to the electric furnace through the AC side of the phase converter.

[0072] In Example 1, the three-winding transformer adopts flux-changing voltage regulation, and a voltage-regulating winding is separately provided on the primary side; specifically, the primary side of the three-winding...

Embodiment 2

[0077] The system connection relation of embodiment 2 is as Figure 9 As shown, the scheme of "increasing parallel converters" is adopted; in this embodiment, the electronic voltage regulating electric furnace transformer (1) is a three-phase structure, consisting of three three-winding transformers (2), one AC-DC converter (3), It is composed of 3 series converters (4) and 3 parallel converters (5); it belongs to ABC three-phase three-winding transformer, its high-voltage winding is connected to the power supply of this phase, and its control winding is connected in series with this phase through the AC-DC converter The converter is connected to the DC side of the parallel converter, and its working winding supplies power to the electric furnace through the AC side of the series converter and the AC side of the parallel converter.

[0078] Its three-winding transformer is composed of high-voltage winding, working winding, control winding and other body structures of the three...

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Abstract

The invention discloses an electronic voltage-regulating electric furnace transformer, which is a three-phase structure, including three three-winding transformers, three converters and an AC-DC converter; the three three-winding transformers and the three converters belong to the ABC three-phase ; Each three-winding transformer includes a high-voltage winding, a working winding and a control winding, and the number of turns of the working winding is much smaller than the number of turns of the control winding; each converter is composed of a single-phase converter and a transformer, and the number of turns of the primary winding of the transformer is much larger The number of turns of the secondary winding; the high-voltage windings of the three three-winding transformers are respectively connected to the three phases of the power supply; the three-phase input terminals of the AC-DC converter are respectively connected to the control windings of the three three-winding transformers; for each converter In other words, the DC side of the single-phase converter is the input terminal of the converter, respectively connected to the three-phase output terminals of the AC-DC converter, the AC side of the single-phase converter is connected in parallel with the primary winding of the transformer, and the secondary winding of the transformer is connected in series with each On the output line of the working winding of the winding transformer; the invention adopts the electronic stepless continuous voltage regulation method to realize the large-scale, rapid and continuous adjustment of the output voltage of the electric furnace transformer.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to an electronic voltage-regulating electric furnace transformer. Background technique [0002] In large-scale industrial enterprises, such as metallurgical industry, chemical industry, machinery industry, etc., the electric furnace is an important process equipment, and the importance of the electric furnace transformer as the power supply of the electric furnace is self-evident. [0003] The electric furnace transformer has the characteristics of heavy load on the auxiliary side, low voltage and high current, etc., and its load characteristics change with the smelting stage; Frequent adjustment actions and more precise adjustment accuracy, and due to its harsh working conditions, the electric furnace transformer needs to have a high overload capacity and a high insulation level; on the other hand, the frequent ignition and extinguishment of the arc d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/42H02M5/10
Inventor 毛承雄王丹梁宇萧珺王元超张高言陆继明
Owner HUAZHONG UNIV OF SCI & TECH
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