CN217820590U

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

Info

Publication number: CN217820590U
Application number: CN202221575671.7U
Authority: CN
Inventors: 韩星; 石秋强; 李芳�
Original assignee: CISDI Engineering Co Ltd
Current assignee: CISDI Engineering Co Ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2022-11-15
Anticipated expiration: 2032-06-22

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 metallurgical industry field relates to electric arc furnace, refining furnace, especially relates to a dynamic on-line measuring device of electric arc furnace heavy current circuit impedance.

Background

The impedance of the large current circuit of the existing electric arc furnace is composed of a flexible compensator, a conductive copper pipe, a large current water-cooled cable and a copper-steel composite conductive cross arm. During smelting production, the up-and-down movement of the graphite electrode can cause the position change of the copper-steel composite conductive cross arm and the swing of the large-current water-cooled cable, and during manual estimation, the estimation is carried out by a static calculation method, and the converted reactance size can change along with the movement of the lifting position of the electrode and the swing of the water-cooled cable; the actual change of the impedance of the high-current line cannot be accurately reflected and is only used as a smelting reference. The voltage of the graphite electrode terminal of the electric arc furnace is different due to the difference of the three-phase voltage of the electric arc furnace transformer at the output terminal.

Compared with the impedance of the arc furnace heavy current circuit which is calculated dynamically, the impedance of the arc furnace heavy current circuit which is calculated only statically originally has larger error and larger working unbalance; the loss of the three-phase heavy current line is also estimated by experience, and the response lag of the electrode adjusting movement is large, so that the power input into the furnace by the electrode is unbalanced, the erosion of refractory materials of the furnace wall is uneven, and the stable smelting production of the electric arc furnace is influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims to provide an electric arc furnace heavy current line impedance's developments on-line measuring device is for reaching above-mentioned purpose, the utility model provides a following technical scheme:

the dynamic online detection device for the impedance of the large-current line of the electric arc furnace 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 outside 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 outlet side three-phase voltage transformer 11 is arranged at the outlet end of the low voltage side of the arc furnace transformer 1 and is used for detecting the output working voltage of the power supply circuit of the arc furnace transformer 1;

and the three-phase electrode voltage transformer 8 is connected with the conductive clamp 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.

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

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

Preferably, the device further comprises an integrator, a first voltage converter and a second voltage converter; the three-phase current Roots coil 10 is connected with an integrator; the outlet 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.

Preferably, the apparatus further comprises a computer; and the computer is respectively connected with the integrator, the first voltage converter and the second voltage converter.

The beneficial effects of the utility model reside in that: the utility model discloses the change of calculation electric arc furnace heavy current circuit impedance that can be real-time dynamic judges three-phase circuit unbalance degree, adjustment graphite electrode operating current and operating voltage, to improving electric arc furnace in heating power's balance, the smelting power factor that improves electric arc furnace, reduce furnace body refractory material's erosion, shorten electric arc furnace smelting cycle, have important guiding meaning.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an electric arc furnace embodying the present invention;

fig. 2 is a schematic connection diagram of the present invention.

Reference numerals are as follows: 1-electric arc furnace transformer; 2-a conductive copper tube; 3-high current water-cooled cable; 4-copper steel composite conductive cross arm; 5-a graphite electrode; 6-electrode front terminal; 7-stainless steel water-cooling pipeline; 8-three-phase electrode voltage transformer; 9-a flexible compensator; 10-roots coil of three-phase current; and 11-a three-phase voltage transformer at the outgoing line side.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can be implemented or applied by other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples can be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

As shown in fig. 1, the schematic diagram of the arc furnace implementing the present invention is that a terminal is arranged at the outlet end of the low voltage side of the arc furnace transformer 1, and the outlet side three-phase voltage transformer 11 is connected through the terminal to detect the fed working voltages of the three power supply circuits of the three-phase transformer respectively; a three-phase current Roots coil 10 is arranged between the flexible compensator 9 and the conductive copper tube 2 of the high-current circuit, wherein the Roots coil can be sleeved on the outer side of the flexible compensator 9 or the conductive copper tube 2, and the three phases are installed in the same direction; the conductive copper tube 2 is connected to the copper-steel composite conductive cross arm 4 through a large-current water-cooled cable 3, is connected to the conductive clamp end through an electrode front end terminal post 6 of the copper-steel composite conductive cross arm 4, adopts a mode of a built-in stainless steel water-cooled pipeline 7, leads out three-phase working voltage of the graphite electrode 5, and then is provided with a three-phase electrode voltage transformer 8 to respectively detect the working voltage of the three graphite electrodes 5.

The three-phase voltage transformer 8 is connected with the second voltage converter, the three-phase voltage transformer 11 on the outgoing line side is connected with the first voltage converter, voltage signals of the two voltage transformers are converted into 0V-10V voltage signals which can be read by a computer, the Roots coil of the three-phase current is externally connected with the integrator to read current signals of the Roots coil, then electric signals of the integrator and the voltage transformers are transmitted to the computer or the PLC to calculate the impedance of a large-current line, as shown in figure 2, and a curve is generated in the computer to display the real-time change of the impedance.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

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.