CN217820590U - Dynamic on-line detection device for large current line impedance of electric arc furnace - Google Patents

Abstract

The utility model relates to a dynamic on-line measuring device of electric arc furnace heavy current circuit impedance belongs to the metallurgical industry field. The device comprises an outlet side three-phase voltage transformer, a Roots coil of three-phase current, a three-phase electrode voltage transformer, an integrator, a voltage converter and a computer or a PLC, wherein the outlet side three-phase voltage transformer is arranged at the outlet end of the low-voltage side of the electric arc furnace transformer, the working voltage is fed out by the detection transformer, the Roots coil of the three-phase current is sleeved outside a flexible compensator or a conductive copper pipe, the working current is fed out by the detection transformer, the working voltage of a graphite electrode is detected by the three-phase electrode voltage transformer through a stainless steel water cooling pipeline, and current and voltage signals are respectively read by the integrator and the voltage converter and then are transmitted to the computer or the PLC to calculate the impedance of a large-current line. The utility model discloses an impedance of real-time dynamic detection heavy current circuit, adjustable graphite electrode operating current and operating voltage guarantee the work electric energy stable balance of each phase circuit.

Description

Dynamic On-Line Detection Device for Large Current Line Impedance of Electric Arc Furnace

technical field

The utility model belongs to the field of metallurgical industry, relates to an electric arc furnace and a refining furnace, in particular to a dynamic on-line detection device for large current line impedance of an electric arc furnace.

Background technique

The impedance of the existing electric arc furnace high-current line is composed of a flexible compensator, a conductive copper tube, a high-current water-cooled cable, and a copper-steel composite conductive cross arm. Since during smelting and production, the up and down movement of the graphite electrode will cause the position change of the copper-steel composite conductive cross arm, and the swing of the high-current water-cooled cable is estimated manually by static calculation. The converted reactance , will change with the movement of the electrode lifting position and the swing of the water-cooled cable; it cannot accurately reflect the actual change of the impedance of the high-current line, and it is only used as a reference for smelting. Due to the difference in the three-phase voltage at the output end of the electric arc furnace transformer, the voltage at the graphite electrode end of the electric arc furnace is also different.

Compared with the impedance of the high-current line of the electric arc furnace calculated dynamically, the impedance of the high-current line of the electric arc furnace calculated only by static calculation has a larger error, and the work imbalance of the high-current line of the electric arc furnace is larger; the loss of the three-phase high-current line It is also estimated by experience that the response of the electrode adjustment movement lags a lot, resulting in an imbalance in the power input into the furnace by the electrode, resulting in uneven erosion of the refractory material on the furnace wall, and affecting the stable smelting production of the electric arc furnace.

Utility model content

In view of this, the purpose of this utility model is to provide a dynamic on-line detection device for electric arc furnace high current line impedance. In order to achieve the above purpose, this utility model provides the following technical solutions:

A dynamic on-line detection device for large current line impedance of an electric arc furnace, including a Roots coil 10 for three-phase current, a three-phase voltage transformer 11 on the outlet side and a three-phase electrode voltage transformer 8;

The Roots coil 10 of the three-phase current is set on the outside of the flexible compensator 9 or the conductive copper tube 2, and is used to detect the feed-out working current of the electric arc furnace transformer 1 power supply circuit;

The outlet-side three-phase voltage transformer 11 is arranged at the outlet end of the low-voltage side of the electric arc furnace transformer 1, and is used to detect the feed-out working voltage of the electric arc furnace transformer 1 power supply circuit;

The three-phase electrode voltage transformer 8 is connected to the conductive chuck end of the graphite electrode 5 through the stainless steel water cooling pipe 7, and is used for detecting the working voltage of the graphite electrode.

Preferably, a terminal is provided at the outlet end of the low-voltage side of the electric arc furnace transformer 1, and is connected to the three-phase voltage transformer 11 on the outlet side through the terminal.

Preferably, the stainless steel water-cooling pipeline 7 is built into the copper-steel composite conductive cross arm 4 .

Preferably, the device also includes an integrator, a voltage converter one and a voltage converter two; the Roots coil 10 of the three-phase current is connected to the integrator; the three-phase voltage transformer 11 on the outlet side is connected to the voltage converter one connection; the three-phase electrode voltage transformer 8 is connected to the second voltage converter.

Preferably, the device further includes a computer; the computer is respectively connected to the integrator, the first voltage converter and the second voltage converter.

The beneficial effect of the utility model is that the utility model can dynamically calculate the change of the impedance of the large current line of the electric arc furnace in real time, judge the unbalance degree of the three-phase circuit, adjust the working current and working voltage of the graphite electrode, and improve the heating power in the electric arc furnace It has important guiding significance to improve the balance of electric arc furnace smelting power factor, reduce the erosion of furnace refractory materials, and shorten the electric arc furnace smelting cycle.

Other advantages, objectives and features of the present utility model will be set forth in the following description to some extent, and to some extent, based on the investigation and research below, it will be obvious to those skilled in the art, or can be Get teaching from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description.

Description of drawings

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the schematic diagram of implementing the electric arc furnace of the present utility model;

Figure 2 is a schematic diagram of the connection of the utility model.

Reference signs: 1-electric arc furnace transformer; 2-conductive copper tube; 3-high-current water-cooled cable; 4-copper-steel composite conductive cross arm; 5-graphite electrode; 6-electrode front-end terminal; 7-stainless steel water-cooled pipe; 8-Three-phase electrode voltage transformer; 9-flexible compensator; 10-Roots coil for three-phase current; 11-three-phase voltage transformer on the outlet side.

Detailed ways

The implementation of the present utility model is described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The utility model can also be implemented or applied through other different specific implementation modes, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the illustrations provided in the following embodiments are only schematically illustrating the basic idea of the present utility model, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

Wherein, accompanying drawing is only for exemplary illustration, and what represent is only schematic diagram, rather than physical figure, can not be interpreted as the restriction to the utility model; In order to better illustrate the embodiment of the utility model, some parts of accompanying drawing will The omission, enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

As shown in Fig. 1, it is the electric arc furnace schematic diagram implementing the utility model, the low-voltage side outlet end of the electric arc furnace transformer 1 is provided with a terminal, and the three-phase voltage transformer 11 on the outlet side is connected through the terminal to detect the three phases of the three-phase transformer respectively. The feed-out operating voltage of a power supply circuit; between the flexible compensator 9 and the conductive copper tube 2 of the large current line, the Roots coil 10 of the three-phase current is set, wherein the Roots coil can be enclosed within the flexible compensator 9 or the conductive copper tube. The outer side of the tube 2, and the three-phase installation must be in the same direction; the conductive copper tube 2 is connected to the copper-steel composite conductive cross-arm 4 through the electrode front-end terminal 6 of the copper-steel composite conductive cross-arm 4 through the high-current water-cooled cable 3, and connected to the At the end of the conductive chuck, the three-phase working voltage of the graphite electrode 5 is drawn out by means of a built-in stainless steel water-cooling pipe 7, and then a three-phase electrode voltage transformer 8 is installed to detect the working voltage of the three graphite electrodes 5 respectively.

Among them, the three-phase electrode voltage transformer 8 is connected to the second voltage converter, and the three-phase voltage transformer 11 on the outlet side is connected to the first voltage converter, and the voltage signals of the two voltage transformers are converted into 0V-10V readable by the computer. The voltage signal, the roots coil of the three-phase current is externally connected to the integrator to read the current signal of the roots coil, and then the electrical signal of the integrator and the voltage transformer is transmitted to the computer or PLC to calculate the impedance of the large current line, as shown in Figure 2. And generate a curve in the computer to display the real-time change of impedance.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the spirit and scope of the technical solutions shall be covered by the claims of the present utility model.

Claims (5)

1. The utility model provides a dynamic on-line measuring device of electric arc furnace heavy current circuit impedance which characterized in that: the three-phase current transformer comprises a three-phase current Roots coil (10), an outlet side three-phase voltage transformer (11) and a three-phase electrode voltage transformer (8);

the three-phase current Roots coil (10) is sleeved on the outer side of the flexible compensator (9) or the conductive copper pipe (2) and used for detecting the fed working current of the power supply circuit of the electric arc furnace transformer (1);

the outgoing line side three-phase voltage transformer (11) is arranged at the outgoing line end of the low-voltage side of the electric arc furnace transformer (1) and used for detecting the fed-out working voltage of a power supply circuit of the electric arc furnace transformer (1);

and the three-phase electrode voltage transformer (8) is connected with the conductive clamping head end of the graphite electrode (5) through a stainless steel water cooling pipeline (7) and is used for detecting the working voltage of the graphite electrode.

2. The dynamic on-line detection device of the arc furnace high current line impedance of claim 1, wherein: a wiring terminal is arranged at the low-voltage side wire outlet end of the electric arc furnace transformer (1) and is connected with a wire outlet side three-phase voltage transformer (11) through the wiring terminal.

3. The dynamic on-line detection device of the arc furnace high current line impedance of claim 1, wherein: the stainless steel water-cooling pipeline (7) is arranged in the copper-steel composite conductive cross arm (4) in a built-in mode.

4. The dynamic on-line detection device of the arc furnace high current line impedance of claim 1, wherein: the device also comprises an integrator, a first voltage converter and a second voltage converter;

the three-phase current Roots coil (10) is connected with the integrator; the outgoing line side three-phase voltage transformer (11) is connected with the first voltage converter; and the three-phase voltage transformer (8) is connected with a second voltage converter.

5. The dynamic on-line detection device for the impedance of a large current line of an electric arc furnace as claimed in claim 1 or 4, wherein: the apparatus also includes a computer;

and the computer is respectively connected with the integrator, the first voltage converter and the second voltage converter.

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