Flexible coil current detector for low-voltage reactive compensation of submerged arc furnace

Abstract

The utility model relates to a low-voltage reactive compensation flexible coil current detector for a submerged arc furnace. The low-voltage reactive compensation flexible coil current detector comprises a U-shaped outer shell, a flexible coil, an electrode plate, a sealing shell, an expansion interface and the like. Modularized assembly is achieved through an innovative mechanical connection system, and the problems that an existing flexible coil current detector is inconvenient in structural connection, cannot be rapidly disassembled and cannot be connected with various conductors for detection are effectively solved, and the defect that the connection stability of a coil and the conductors is insufficient is overcome. The detector adopts a U-shaped outer shell as a core supporting structure, a flexible coil assembly matched with the shell in shape is arranged in the outer shell, a special cavity for containing a flexible coil is formed in the outer shell, and a double-positioning structure composed of limiting rods and vertical blocking rods is symmetrically distributed on the side edges of the outer shell and matched with a sliding groove system designed in a sealing shell. The sealing shell can accurately slide to a preset position along the limiting rod, and physical limiting is achieved through distance matching between the blocking rod and the opening of the outer shell.

Description

Technical Field

[0001] This utility model provides a flexible coil current detector, belonging to the field of low-voltage reactive power compensation technology for electric arc furnaces, and specifically relates to a flexible coil current detector for low-voltage reactive power compensation in electric arc furnaces. Background Technology

[0002] In the low-voltage reactive power compensation system of an electric arc furnace (EAF), a flexible coil current detector is used to measure the current on the low-voltage side of the furnace transformer and the current of the compensation capacitor. Through vector calculation, the short-circuit current after the compensation connection point and the electrode current can be obtained. These measurement data are of great significance for achieving precise control and optimized operation of reactive power compensation in the EAF, improving the system's power factor, reducing power loss, and improving power quality.

[0003] Existing flexible coil current detectors have some problems and shortcomings in practical applications. For example, their structural design makes connection inconvenient, hindering quick disassembly and connection to various conductors for detection. Specifically, the coil of the flexible coil current detector is usually tightly wound on a flexible frame and connected to the sampling resistor module through a plug-in interface. This connection method is not flexible and efficient enough in situations requiring frequent disassembly and installation. Furthermore, the connection stability between the coil and the conductor needs improvement to ensure measurement accuracy and reliability. In low-voltage reactive power compensation systems for submerged arc furnaces, the complexity of conductor shape and installation environment may present more difficulties and challenges during the installation and disassembly of existing flexible coil current detectors. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this application provides a flexible coil current detector for low-voltage reactive power compensation in electric arc furnaces. This solves the problems of inconvenient connection, inability to quickly disassemble, and inability to connect with various conductors for detection in existing flexible coil current detectors, as well as the lack of stability in the connection between the coil and the conductor.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a flexible coil current detector for low-voltage reactive power compensation of a submerged arc furnace, comprising a U-shaped outer shell, wherein a flexible coil corresponding to itself is provided inside the outer shell, and two ends of the flexible coil are respectively connected to mechanically connected electrode plates, and the opening of the outer shell is provided with a cover corresponding to itself, the flexible coil, and the electrode plates, and the side of the cover away from the outer shell is provided with an expansion interface for connecting external devices.

[0006] Preferably, the outer shell has a cavity inside that corresponds to the flexible coil, and a pair of symmetrically distributed limiting rods are provided on one side of the outer shell. The two sides of the limiting rods are integrally connected with blocking rods that are perpendicular to themselves.

[0007] Preferably, the enclosure has a groove corresponding to the limiting rod, and the width of the enclosure corresponds to the distance from the blocking rod to the opening of the outer shell.

[0008] Preferably, the electrode sheet and the expansion interface are movably connected, and the electrode sheet and the expansion interface are electrically connected. The casing is provided with a mounting base corresponding to the electrode sheet.

[0009] Preferably, the electrode sheet has a T-shaped card plate on the side opposite to the expansion interface that abuts against itself and penetrates the casing.

[0010] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0011] This device uses a U-shaped outer shell as its core support structure. Inside, a flexible coil conforms to the shape of the shell, with mechanically connectable electrode plates at both ends. The outer shell opening has a corresponding enclosure for itself, the flexible coil, and the electrode plates. An expansion interface for connecting external devices is located on the side of the enclosure furthest from the outer shell. This structural design effectively solves the problems of inconvenient connection, inability to quickly disassemble, and difficulty in connecting to various conductors in existing flexible coil current detectors, as well as the insufficient stability of the coil-conductor connection. Specifically, the U-shaped outer shell provides stable support and protection for the flexible coil, allowing it to fit tightly to conductors of different shapes, enhancing adaptability. The mechanically connectable nature of the electrode plates makes the detector easier to install and disassemble, quickly adapting to various conductors and improving detection efficiency and flexibility. The enclosure design not only protects the internal components but also provides physical restraint through its tight fit with the outer shell, ensuring the mechanical stability of the detector under complex operating conditions. The expansion interface facilitates connection to external devices, establishing a complete current signal detection and transmission link, further improving the detector's engineering applicability and maintenance convenience. Overall, through the optimized combination of its components, this detector not only improves mechanical performance and adaptability but also significantly reduces maintenance costs, providing a strong guarantee for the accurate detection and efficient operation of the low-pressure reactive power compensation system of the electric arc furnace.

[0012] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the installation of a flexible coil current detector for low-voltage reactive power compensation in a submerged arc furnace according to the present invention.

[0014] Figure 2This is an exploded view of a flexible coil current detector for low-voltage reactive power compensation in a submerged arc furnace according to the present invention.

[0015] Figure 3 This is a cross-sectional view of the outer casing of a flexible coil current detector for low-voltage reactive power compensation in a submerged arc furnace according to the present invention.

[0016] Figure 4 This is a cross-sectional view of the flexible coil current detector for low-voltage reactive power compensation in a submerged arc furnace, as per the present invention, in its installed state.

[0017] As shown in the figure:

[0018] 1. Outer shell; 2. Flexible coil; 3. Electrode sheet; 4. Sealing shell; 5. Expansion interface; 6. Limiting rod; 7. Blocking rod; 8. Slide groove; 9. Mounting base; 10. T-shaped clamping plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] like Figure 1 and Figure 2As shown, a flexible coil current detector for low-voltage reactive power compensation in a submerged arc furnace uses a U-shaped shell as its core support structure. Inside, a flexible coil assembly adapted to the shell shape is housed, and modular assembly is achieved through an innovative mechanical connection system. A dedicated cavity within the shell accommodates the flexible coil, and a dual positioning structure consisting of limit rods and vertical blocking rods is symmetrically distributed on the sides. Combined with a sliding groove system designed inside the shell, the shell can precisely slide to a predetermined position along the limit rods, and physical limiting is achieved by matching the distance between the blocking rods and the opening of the shell. This structural design effectively solves the mechanical stability problem of the detector under complex operating conditions.

[0023] In this embodiment, the electrode plates are connected to both ends of the flexible coil and fixed by mounting bases within the casing. Simultaneously, the electrode plates are movably connected to the expansion interface to achieve electrical conductivity. This design makes the detector easier to install and remove, allowing for rapid adaptation to conductors of different shapes and sizes, thus improving detection efficiency and flexibility. Furthermore, the T-shaped clamping plate penetrates the casing and abuts against the electrode plates, further enhancing connection reliability and ensuring stable operation even in harsh environments such as high temperatures and vibrations. Overall, through the optimized combination of its components, this detector not only improves mechanical performance and adaptability but also significantly reduces maintenance costs, providing strong support for the accurate detection and efficient operation of the low-pressure reactive power compensation system in submerged arc furnaces.

[0024] Specifically, by placing a flexible coil around the conductor being measured, the current signal is converted into a differential voltage signal, which is then integrated to obtain the actual current value. This detector can directly measure the low-voltage side current of the furnace transformer and the current of the compensation capacitor in the low-voltage reactive power compensation system of an electric arc furnace, and then calculate the electrode current.

[0025] The flexible coil current detection system mainly consists of a flexible Rogowski coil, a signal processing circuit, and an integrator. The flexible Rogowski coil possesses excellent flexibility and malleability, allowing it to be easily placed inside a housing. The signal processing circuit amplifies and filters the differential voltage signal output from the Rogowski coil to improve signal quality and stability. The integrator converts the differential voltage signal into an actual current signal. All of these components are electrically connected to the expansion interface.

[0026] like Figure 3 and Figure 4As shown, the system achieves its electrical functions through a dynamic connection between detachable electrode plates and an expansion interface. The electrode plates employ a bidirectional connection design, maintaining fixed conductivity with the flexible coil while also forming a pluggable electrical connection with the expansion interface on the housing via a movable connection method. A specially designed T-shaped clamp penetrates the housing and forms elastic contact with the electrode plates, ensuring reliable electrical contact while enabling quick assembly and disassembly. The integrated design of the mounting base allows for precise positioning of the electrode plates, and combined with the external device connection capabilities of the expansion interface, a complete current signal detection and transmission link is constructed, significantly improving the detector's engineering applicability and ease of maintenance.

[0027] In this implementation plan, the selection and parameter design of each component are all based on the specific requirements of the low-pressure reactive power compensation system for the electric arc furnace. The U-shaped outer shell is made of high-strength insulating materials, such as glass fiber reinforced plastic, and its internal cavity dimensions are customized according to the specifications of the flexible coil to ensure a tight fit between the coil and sufficient space to accommodate the limiting rod and the blocking rod. The flexible coil is usually wound with multi-strand stranded wire, and the number of turns is determined according to the measurement range and accuracy requirements, generally between several hundred and several thousand turns. The wire diameter is calculated based on the maximum current density it can withstand, and is usually 0.1-0.5mm. 2 The electrode plates are made of high-conductivity copper, approximately 1-3mm thick, with a tin-plated surface to enhance oxidation resistance and contact reliability. Their connection to the flexible coil is achieved through cold-press welding, ensuring a long-term stable electrical connection. The casing is made of a matching plastic material, with the internal sliding groove and limit rod achieving a precision of 0.1mm to ensure smooth sliding and accurate positioning. The expansion interfaces are selected based on the electrical characteristics of the connected equipment; for example, the BNC interface is suitable for high-frequency signal transmission, while the banana plug interface facilitates high-current testing connections. The overall structural design, while meeting electrical performance requirements, also fully considers mechanical strength and heat dissipation performance, ensuring stable operation of the detector in the harsh working environment of a submerged arc furnace.

[0028] When using the flexible coil current detector for low-voltage reactive power compensation in this submerged arc furnace, the U-shaped outer shell is first placed around the conductor being measured. The flexible coil inside converts the current signal into a differential voltage signal, which is then amplified and filtered by the signal processing circuit. Finally, an integrator converts this signal into the actual current value, enabling direct measurement of the low-voltage side current of the furnace transformer and the current of the compensation capacitor, and calculating the electrode current. During installation, a dual positioning structure consisting of a limiting rod on the side of the outer shell and a vertical blocking rod, combined with a sliding groove system inside the shell, allows the shell to slide precisely to the predetermined position along the limiting rod. Physical limiting is achieved by matching the distance between the blocking rod and the opening of the outer shell, ensuring the mechanical stability of the detector under complex operating conditions. The electrode plates are connected to both ends of the flexible coil and fixed by the mounting base inside the shell. They are also movably connected to the expansion interface to achieve electrical conduction. This design makes the detector easier to install and remove, allowing it to quickly adapt to conductors of different shapes and sizes, improving detection efficiency and flexibility. Simultaneously, a T-shaped clamping plate penetrates the shell and abuts against the electrode plates, further enhancing the reliability of the connection and ensuring stable operation even in harsh environments such as high temperatures and vibrations. Overall, through the optimized combination of its components, this detector not only improves mechanical performance and adaptability but also significantly reduces maintenance costs, providing a strong guarantee for the accurate detection and efficient operation of the low-pressure reactive power compensation system of the electric arc furnace.

[0029] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A flexible coil current detector for low-voltage reactive power compensation in a submerged arc furnace, comprising a U-shaped outer shell (1), characterized in that: The outer shell (1) has a flexible coil (2) corresponding to itself inside. The two ends of the flexible coil (2) are connected to mechanically connected electrode plates (3). The opening of the outer shell (1) is provided with a cover (4) corresponding to itself, the flexible coil (2), and the electrode plates (3). The side of the cover (4) away from the outer shell (1) is provided with an expansion interface (5) for connecting external devices.

2. A flexible coil current detector for low voltage reactive power compensation of an arc furnace according to claim 1, characterized in that The outer shell (1) has a cavity inside that corresponds to the flexible coil (2). A pair of symmetrically distributed limiting rods (6) are provided on one side of the outer shell (1). The two sides of the limiting rods (6) are integrally connected with blocking rods (7) that are perpendicular to themselves.

3. A flexible coil current detector for low voltage reactive power compensation of an arc furnace according to claim 2, characterized in that: The enclosure (4) is provided with a groove (8) corresponding to the limiting rod (6), and the width of the enclosure (4) corresponds to the distance from the blocking rod (7) to the opening of the outer shell (1).

4. A flexible coil current detector for low voltage reactive power compensation of an arc furnace according to claim 1, characterized in that: The electrode sheet (3) and the expansion interface (5) are movably connected, and the electrode sheet (3) and the expansion interface (5) are electrically connected. The housing (4) is provided with a mounting base (9) corresponding to the electrode sheet (3).

5. A flexible coil current detector for low voltage reactive power compensation of an arc furnace according to claim 1, characterized in that: The electrode sheet (3) has a T-shaped card plate (10) on the side opposite to the expansion interface (5) that abuts against itself and penetrates the casing (4).

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