Current measuring device and electrolytic aluminum production system

Abstract

The utility model provides a current measuring device and an electrolytic aluminum production system, and relates to the technical field of electrolytic aluminum production, the current measuring device comprises an optical fiber current sensor, a data processing box, a first heat preservation shell and an air conditioner, the optical fiber current sensor is connected with the data processing box, and the first heat preservation shell is wrapped outside the optical fiber current sensor; and an indoor unit of the air conditioner is arranged in the data processing box. On one hand, the optical fiber current sensor is wrapped with the first heat preservation shell, heat preservation and heat insulation are carried out on the optical fiber current sensor, and temperature drift of the optical fiber current sensor is avoided; on the other hand, the indoor unit of the air conditioner is arranged in the data processing box, heat generated when the data processing box works and external high temperature are eliminated through the air conditioner, and temperature drift of electronic elements in the data processing box is avoided; therefore, the current detection accuracy of the electrolytic bath busbar is ensured, and the upper computer can accurately control the production operation of the electrolytic bath.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic aluminum production, and in particular to a current measuring device and an electrolytic aluminum production system. Background Art

[0002] Existing high-current DC measurement devices are divided into two types: traditional Hall sensors and new fiber optic sensors. The detection method of fiber optic sensors is affected by temperature changes and has temperature drift, which limits the accuracy of high-current DC measurement and has a greater impact on production operations in certain fields that require relatively high DC measurement accuracy.

[0003] For example, in the electrolytic aluminum production process, optical fiber sensors are generally used to sense the DC current of the busbar. The optical fiber sensor senses the corresponding optical signal based on the measured DC current of the electrolytic cell busbar, and then transmits the optical signal to the data processing box. The data processing box analyzes the measured current size and uploads it to the host computer. The host computer then controls the production operation process parameters of the electrolytic cell according to the corresponding control signal.

[0004] Since existing fiber optic sensors are generally installed directly outdoors, the temperature on the surface of the fiber optic sensors changes greatly in hot weather and strong sunlight, and the current detection accuracy is poor. Although the data processing box is installed indoors, the electronic components inside it generate more heat when processing signals. In addition, the ambient temperature of the workshop is high when the electrolytic cell is working in the electrolysis workshop, and the electronic components are prone to temperature drift, affecting the accuracy of data transmission and calculation. As a result, the errors in detection accuracy and data transmission calculation result in a large difference between the process requirements to be controlled by the control signal received by the host computer and the actual situation, affecting the production operation of the electrolytic cell. Utility Model Content

[0005] The utility model aims to solve the technical problem that the current measurement accuracy of the existing direct current measuring device using an optical fiber sensor is limited due to the great influence of temperature change.

[0006] On the one hand, the utility model provides a current measuring device, including a fiber optic current sensor, a data processing box, a first insulation shell and an air conditioner, wherein the fiber optic current sensor is used to be wound around a current-carrying conductor, the fiber optic current sensor is connected to the data processing box, the first insulation shell is wrapped around the outside of the fiber optic current sensor, and the indoor unit of the air conditioner is arranged in the data processing box.

[0007] Optionally, the current measuring device further comprises a second heat-insulating shell, wherein the second heat-insulating shell is wrapped around the outside of the data processing box.

[0008] Optionally, the first thermal insulation shell and / or the second thermal insulation shell comprises thermal insulation cotton and a sunshade and heat insulation film, and the outer side of the thermal insulation cotton is wrapped with the sunshade and heat insulation film.

[0009] Optionally, the data processing box includes a box body and a data processing module, the data processing module is disposed in the box body, and the data processing module is connected to the optical fiber current sensor via an optical fiber.

[0010] Optionally, the data processing box also includes a temperature sensor and a control module, the temperature sensor and the indoor unit are both arranged in the box, the control module is electrically connected to the temperature sensor and the indoor unit respectively, and the control module is configured to adjust the temperature of the indoor unit according to the measurement information of the temperature sensor.

[0011] Optionally, the data processing box further comprises a display screen, which is disposed on an outer surface of the box body and is electrically connected to the temperature sensor and the control module.

[0012] Optionally, the fiber optic current sensor is a fiber optic sensitive ring, and the current measuring device further comprises a fixed bracket, the fixed bracket is a ring structure, the fixed bracket is sleeved outside the current-carrying conductor, and the fiber optic sensitive ring is sleeved outside the fixed bracket.

[0013] Optionally, the fixed bracket includes a crossbeam and a connecting rod, the two crossbeams are arranged opposite to each other, the connecting rods are detachably connected between the two ends of the two crossbeams, and the two crossbeams and the two connecting rods are combined to form a frame structure.

[0014] Optionally, the cross-section of the current-carrying conductor is square, and the fixed bracket also includes a pad block, four of which are respectively arranged at the four inner corners of the frame structure, and the pad block includes a first pad portion and a second pad portion which are arranged at angles to each other, and the first pad portion and the second pad portion are respectively used to fit with two adjacent surfaces of the current-carrying conductor.

[0015] On the other hand, the utility model proposes an electrolytic aluminum production system, including an electrolytic cell busbar and the above-mentioned current measuring device, wherein the optical fiber current sensor of the current measuring device is used to be wound around the electrolytic cell busbar.

[0016] The current measuring device of the utility model can measure the current-carrying conductor of the electrolytic cell busbar, and the optical fiber current sensor is wound on the electrolytic cell busbar, and a corresponding optical signal is sensed according to the current size in the electrolytic cell busbar, and then the optical signal is transmitted to the data processing box, and the data processing box analyzes the optical signal to obtain the measured current size and transmits it to the upper computer to adjust the working parameters of the electrolytic cell. On the one hand, the optical fiber current sensor basically does not generate heat when working. By wrapping the first insulation shell outside the optical fiber current sensor, the optical fiber current sensor is insulated by the first insulation shell to keep it basically at room temperature, so as to avoid the temperature drift of the optical fiber current sensor caused by the change of the external environment temperature, and ensure the accuracy of the optical signal sensed; on the other hand, by setting the indoor unit of the air conditioner in the data processing box, the heat generated by the data processing box when working and the external high temperature are eliminated by the air conditioner, so as to avoid the temperature drift of each electronic component in the data processing box, and ensure the accuracy of the current finally analyzed; the utility model can significantly improve the accuracy of the DC current size detection from the two aspects of improving the accuracy of the current sensing process and the accuracy of the signal transmission processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a current measuring device according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0019] Figure 3 It is a schematic diagram of the partial exploded structure of the current measuring device according to an embodiment of the utility model.

[0020] Description of reference numerals:

[0021] 1. Fiber optic current sensor; 2. Data processing box; 21. Box body; 22. Data processing module; 3. First insulation shell; 4. Air conditioner; 41. Indoor unit; 42. Outdoor unit; 5. Second insulation shell; 6. Fixed bracket; 61. Crossbeam; 62. Connecting rod; 63. Cushion block; 631. First cushion part; 632. Second cushion part; 7. Electrolyzer busbar. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "matched" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, it should be noted that in the description of the present invention, it should be noted that the terminology nouns in the various embodiments, such as "upper", "lower", "front", "back" and other words indicating directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the components and devices referred to must be operated in accordance with the specific directions and specified operations and methods and structures in the specification. Such directional nouns do not constitute a limitation on the present invention.

[0025] In this article, an XYZ coordinate system is established, in which the positive direction of the X axis represents the front, the reverse direction of the X axis represents the back, the positive direction of the Y axis represents the left, the reverse direction of the Y axis represents the right, the positive direction of the Z axis represents the top, and the reverse direction of the Z axis represents the bottom. It should also be noted that the aforementioned X axis, Y axis, and Z axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0026] Common high-current DC measurement devices include fiber optic sensors and Hall sensors, with a measurement range of 0-700kA. The highest DC current in electrolytic aluminum production reaches 600kA. At the same time, fiber optic sensors have gradually replaced Hall sensors in the electrolytic aluminum industry because of their high measurement accuracy, easy installation and small size compared to traditional Hall sensors. Fiber optic sensors are usually exposed to the outside, and their outer shells are made of aluminum alloy. Temperature drift occurs with the temperature in the morning and evening or in different seasons. Temperature drift is temperature drift, which generally refers to the change of transistor parameters when the ambient temperature changes, which will cause instability of the static operating point, instability of the circuit dynamic parameters, and even make the circuit unable to work normally.

[0027] The data processing box is equipped with electronic components such as voltage isolators and current isolators. Each electronic component generates heat during operation. Under the influence of changes in external ambient temperature and internal working heat, the related devices in the data processing box are also prone to temperature drift.

[0028] like Figure 1 , 3As shown, a current measuring device of an embodiment of the utility model includes a fiber optic current sensor 1, a data processing box 2, a first insulation shell 3 and an air conditioner 4, wherein the fiber optic current sensor 1 is used to be wound around a current-carrying conductor, the fiber optic current sensor 1 is connected to the data processing box 2, the first insulation shell 3 is wrapped around the outside of the fiber optic current sensor 1, and the indoor unit 41 of the air conditioner 4 is arranged in the data processing box 2.

[0029] Specifically, the principle of measuring current of the optical fiber current sensor 1 is the prior art. Specifically, the optical fiber current sensor includes an optical fiber sensing element. When current flows through the current-carrying conductor, a magnetic field is generated around it. This magnetic field causes the phase, intensity or frequency of the optical signal in the optical fiber sensing element to change, that is, the corresponding optical signal is induced. The change of this optical signal is converted into an electrical signal, and the current size of the measured current-carrying conductor can be obtained. The first insulation shell 3 is made of insulation material, and the first insulation shell 3 is wrapped outside the optical fiber current sensor 1. Its specific shape is designed according to the shape of the optical fiber current sensor 1. The optical fiber current sensor 1 is connected to the data processing box 2 through optical fiber. The data processing box 2 can be a square structure, and the volume of the data processing box 2 is relatively large. The air conditioner 4 includes an indoor unit 41 and an outdoor unit 42. The indoor unit 41 is arranged in the data processing box 2, and the outdoor unit 42 is arranged outside the data processing box 2.

[0030] In this embodiment, the optical fiber current sensor 1 senses a corresponding optical signal according to the current in the current-carrying conductor, and then transmits the optical signal to the data processing box 2, which processes the optical signal and analyzes it to obtain the measured current. On the one hand, the optical fiber current sensor 1 basically does not generate heat when working. By wrapping the first insulation shell 3 outside the optical fiber current sensor 1, the optical fiber current sensor 1 is insulated by the first insulation shell 3, so that it is basically kept at a normal temperature state, avoiding the optical fiber current sensor 1 from temperature drift caused by changes in the external environment temperature, and ensuring the accuracy of the optical signal sensed; on the other hand, by setting the indoor unit 41 of the air conditioner 4 in the data processing box 2, the air conditioner 4 is used to eliminate the heat generated by the data processing box 2 when working and the external high temperature, keeping the temperature in the data processing box 2 constant, avoiding temperature drift of each electronic component in the data processing box 2, and ensuring the accuracy of the current finally analyzed; the utility model can significantly improve the accuracy of DC current detection from two aspects of improving the accuracy of the current sensing process and the accuracy of the signal transmission processing process. The current measurement device solution using an optical fiber sensor provided in this embodiment can improve the accuracy of the current measurement value in the full temperature range from ±0.1% to ±0.02%, an improvement of more than 80%.

[0031] like Figure 1As shown, optionally, the current measuring device further includes a second heat-insulating shell 5 , and the second heat-insulating shell 5 is wrapped around the outside of the data processing box 2 .

[0032] Specifically, the second insulation shell 5 and the first insulation shell 3 can be made of the same or different insulation materials. The second insulation shell 5 is wrapped around the outside of the data processing box 2, and its specific shape is designed according to the appearance of the data processing box 2.

[0033] In this embodiment, while the temperature inside the data processing box 2 is adjusted by the air conditioner 4, a second insulation shell 5 is wrapped around the outside of the data processing box 2. The second insulation shell 5 can be used to insulate the data processing box 2, prevent the heat inside the box from being dissipated, and save the power consumption of the air conditioner 4.

[0034] Optionally, the first thermal insulation shell 3 and / or the second thermal insulation shell 5 comprises thermal insulation cotton and a sunshade and heat-insulating film, and the outer side of the thermal insulation cotton is wrapped with the sunshade and heat-insulating film.

[0035] Specifically, the method of wrapping the first insulation shell 3 outside the optical fiber current sensor 1 is the same as the method of including the second insulation shell 5 outside the data processing box 2. The method of wrapping the first insulation shell 3 outside the optical fiber current sensor 1 is now taken as an example for explanation: first, a layer of 50 mm thick insulation cotton is wrapped around the optical fiber current sensor 1, and then a layer of 0.2 mm thick sunshade and heat insulation film is wrapped around it, which can save material costs while ensuring the insulation effect.

[0036] In some other embodiments, the first insulation shell 3 and the second insulation shell 5 can also be made of materials such as self-adhesive rubber-plastic insulation cotton, high-temperature resistant insulation cotton, aluminum silicate insulation material and silica aerogel.

[0037] like Figure 1 As shown, optionally, the data processing box 2 includes a box body 21 and a data processing module 22, the data processing module 22 is arranged in the box body 21, and the data processing module 22 is connected to the optical fiber current sensor 1 through an optical fiber.

[0038] Specifically, the box body 21 can be a rectangular structure, and the data processing module 22 is arranged inside the box body 21. The box body 21 is used to protect the data processing module 22. An opening is provided on one side of the box body 21, and a box door can be opened and closed at the opening. By opening the box door, various components in the box can be easily installed, disassembled and repaired.

[0039] Optionally, the data processing box 2 also includes a temperature sensor and a control module. The temperature sensor and the indoor unit 41 are both arranged in the box body 21. The control module is electrically connected to the temperature sensor and the indoor unit 41 respectively. The control module is configured to adjust the temperature of the indoor unit 41 according to the measurement information of the temperature sensor.

[0040] Specifically, the temperature sensor and the control module are arranged in the box 21. The temperature sensor, the control module and the data processing module 22 can be integrated into one. The temperature sensor can detect the temperature in the box 21 in real time, that is, obtain the working temperature of the data processing module 22.

[0041] In this embodiment, the temperature sensor, the control module and the indoor unit 41 of the air conditioner 4 constitute a closed-loop control, and the temperature in the box 21 can be maintained at about 25°C all year round. For example, the adjustment temperature of the air conditioner 4 is preset to 25°C. According to the temperature in the box 21 detected by the temperature sensor, if the measured temperature is too high or too low, the control module can turn on the air conditioner 4 and start cooling or heating. If the measured temperature is around 25°C, the control module turns off the air conditioner 4.

[0042] Optionally, the data processing box 2 further includes a display screen, which is disposed on the outer surface of the box body 21 , and is electrically connected to the temperature sensor and the control module.

[0043] Specifically, the display screen can be set on the box door, the display screen can be a touch screen, the temperature information detected by the temperature sensor can be fed back to the display screen and the control module in real time, the display screen can display the temperature inside the box in real time, the display is more intuitive, and it is convenient to continue related operations.

[0044] like Figure 3 As shown, optionally, the fiber optic current sensor 1 is a fiber optic sensitive ring, and the current measuring device also includes a fixed bracket 6, which is a ring structure, and the fixed bracket 6 is sleeved outside the current-carrying conductor, and the fiber optic sensitive ring is sleeved outside the fixed bracket 6.

[0045] Specifically, the fiber optic sensitive ring is a ring-shaped fiber Bragg grating or a ring-shaped fiber interferometer structure, which uses the ring structure to make the light signal propagate repeatedly in the optical fiber, thereby enhancing the sensitivity and stability of the sensor. The fiber optic sensitive ring has the advantages of high sensitivity, good stability, and strong anti-interference ability.

[0046] The current measuring device provided in this embodiment can be used for large current direct current measurement. Generally, the current passing through the current-carrying conductor can reach several hundred KA, and the current-carrying conductor itself has obvious heating phenomenon. For example, in the electrolytic aluminum production process, the current-carrying conductor can be the electrolytic cell busbar 7. The current in the electrolytic cell busbar 7 can reach 600KA, and the voltage can reach up to 1000V. The temperature of the electrolytic cell busbar itself is about 50-60°C. If the heat of the current-carrying conductor is transferred to the optical fiber sensitive ring, its measurement accuracy will be affected. By providing a fixed bracket 6 between the optical fiber sensitive ring and the electrolytic cell busbar 7, the optical fiber sensitive ring can be separated from the electrolytic cell busbar 7 to ensure the measurement accuracy of the optical fiber sensitive ring.

[0047] like Figure 1-3 As shown, optionally, the fixed bracket 6 includes a cross beam 61 and a connecting rod 62, the two cross beams 61 are arranged opposite to each other, the connecting rod 62 is detachably connected between the two ends of the two cross beams 61, and the two cross beams 61 and the two connecting rods 62 are combined to form a frame structure.

[0048] Specifically, the fixed bracket 6 is composed of two cross beams 61 and two connecting rods 62 that are detachably connected, which is convenient for installation on the outside of the current-carrying conductor, and has a simple structure and low cost. In addition, the fixed bracket 6 with a frame-type structure is particularly suitable for current-carrying conductors with square cross sections, which is easier to install and fix and is conducive to saving space; for example, the electrolytic cell busbar 7 is a rectangular structure extending in the direction indicated by the X-axis, and its cross section is square. The two cross beams 61 of the fixed bracket 6 are respectively arranged on the upper and lower sides of the electrolytic cell busbar 7 and extend in the direction indicated by the Y-axis. The two connecting rods 62 are respectively arranged on the left and right sides of the electrolytic cell busbar 7 and extend in the direction indicated by the Z-axis. The connecting rods 62 are fixedly connected to the cross beams 61. The optical fiber sensitive ring is sleeved outside the frame structure and can be bound to the frame structure by cable ties, ropes, etc. Here, the left and right ends of the cross beam 61 can be bent in the direction close to the electrolytic cell busbar to form a step, and a receiving space is formed between the step and the optical fiber sensitive ring. The end of the connecting rod 62 passes through the cross beam 61 to extend into the receiving space, such as Figure 2 shown.

[0049] like Figure 2-3 As shown, optionally, the cross-section of the current-carrying conductor is square, and the fixing bracket 6 also includes a pad 63, and four of the pads 63 are respectively arranged at the four inner corners of the frame structure, and the pad 63 includes a first pad portion 631 and a second pad portion 632 arranged at an angle to each other, and the first pad portion 631 and the second pad portion 632 are respectively used to fit with two adjacent surfaces of the current-carrying conductor.

[0050] Specifically, the cross-section of the current-carrying conductor is square, that is, the cross-section of the current-carrying conductor perpendicular to the current transmission direction is square. At this time, the current-carrying conductor includes four corners, and the four inner corners of the frame structure correspond to the four corners surrounding the current-carrying conductor. By arranging pads at the four inner corners of the frame structure, a gap is formed between the frame structure and the current-carrying conductor, which can further increase the distance between the optical fiber sensitive ring and the electrolytic cell busbar 7, thereby ensuring the measurement accuracy of the optical fiber sensitive ring.

[0051] The pad 63 includes a first pad portion 631 and a second pad portion 632 arranged at an angle to each other, and can be an L-shaped structure. The four pads 63 are respectively arranged at the four inner corners of the frame structure. Taking the current-carrying conductor as the electrolytic cell busbar 7 as an example, the four pads 63 are respectively located at the upper left, lower left, upper right and lower right corners of the electrolytic cell busbar 7. Specifically, the first pad portions 631 of the two upper pads 63 are respectively fitted with the upper surface of the electrolytic cell busbar 7, and the second pad portions 632 of the two upper pads 63 are respectively fitted with the left and right sides of the electrolytic cell busbar 7. The first pads 631 of the two lower pads 63 are respectively fitted with the lower surface of the electrolytic cell busbar 7, and the second pads 632 of the two lower pads 63 are respectively fitted with the left and right sides of the electrolytic cell busbar 7. The upper crossbeam 61 is located above the first pads 631 of the two upper pads 63, and the lower crossbeam 61 is located below the first pads 631 of the two lower pads 63. The left connecting rod 62 is located on the left side of the second pads 632 of the two left pads 63, and the right connecting rod 62 is located on the right side of the second pads 632 of the two right pads 63.

[0052] Another embodiment of the utility model provides an electrolytic aluminum production system, including an electrolytic cell busbar 7 and the above-mentioned current measuring device, wherein the optical fiber current sensor 1 of the current measuring device is used to be wound around the electrolytic cell busbar 7.

[0053] Specifically, in the electrolytic aluminum production process, the current-carrying conductor can be the electrolytic cell busbar 7. The optical fiber current sensor 1 senses a corresponding optical signal according to the current in the electrolytic cell busbar 7, and then transmits the optical signal to the data processing box 2. The data processing box 2 analyzes the measured current size and transmits it to the host computer to adjust the working parameters of the electrolytic cell. The current measuring device using an optical fiber sensor provided in this embodiment can effectively improve the accuracy of DC current detection, thereby ensuring that the host computer can accurately control the production operation of the electrolytic cell.

[0054] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A current measuring device, characterized in that: The invention comprises an optical fiber current sensor (1), a data processing box (2), a first heat-insulating shell (3) and an air conditioner (4), wherein the optical fiber current sensor (1) is used to be wound around a current-carrying conductor, the optical fiber current sensor (1) is connected to the data processing box (2), the first heat-insulating shell (3) is wrapped around the outside of the optical fiber current sensor (1), and the indoor unit (41) of the air conditioner (4) is arranged in the data processing box (2).

2. The current measuring device according to claim 1, characterized in that: It also includes a second heat-insulating shell (5), wherein the second heat-insulating shell (5) is wrapped around the outside of the data processing box (2).

3. The current measuring device according to claim 2, characterized in that: The first heat-insulating shell (3) and / or the second heat-insulating shell (5) comprises heat-insulating cotton and a sunshade and heat-insulating film, and the outer side of the heat-insulating cotton is wrapped with the sunshade and heat-insulating film.

4. The current measuring device according to claim 1, characterized in that: The data processing box (2) comprises a box body (21) and a data processing module (22); the data processing module (22) is arranged in the box body (21); and the data processing module (22) is connected to the optical fiber current sensor (1) via an optical fiber.

5. The current measuring device according to claim 4, characterized in that: The data processing box (2) further comprises a temperature sensor and a control module. The temperature sensor and the indoor unit (41) are both arranged in the box body (21). The control module is electrically connected to the temperature sensor and the indoor unit (41) respectively. The control module is configured to adjust the temperature of the indoor unit (41) according to measurement information of the temperature sensor.

6. The current measuring device according to claim 5, characterized in that: The data processing box (2) further comprises a display screen, which is arranged on the outer surface of the box body (21), and is electrically connected to the temperature sensor and the control module.

7. The current measuring device according to claim 1, characterized in that: The optical fiber current sensor (1) is an optical fiber sensitive ring, and further comprises a fixed bracket (6), wherein the fixed bracket (6) is an annular structure, the fixed bracket (6) is sleeved outside the current-carrying conductor, and the optical fiber sensitive ring is sleeved outside the fixed bracket (6).

8. The current measuring device according to claim 7, characterized in that: The fixed bracket (6) comprises a crossbeam (61) and a connecting rod (62), the two crossbeams (61) are arranged opposite to each other, the connecting rod (62) is detachably connected between the two ends of the two crossbeams (61), and the two crossbeams (61) and the two connecting rods (62) are enclosed to form a frame structure.

9. The current measuring device according to claim 8, characterized in that: The cross section of the current-carrying conductor is square. The fixing bracket (6) further comprises a pad (63). Four of the pads (63) are respectively arranged at four inner corners of the frame structure. The pad (63) comprises a first pad portion (631) and a second pad portion (632) arranged at an angle to each other. The first pad portion (631) and the second pad portion (632) are respectively used to fit with two adjacent surfaces of the current-carrying conductor.

10. An electrolytic aluminum production system, characterized in that: It comprises an electrolytic cell busbar (7) and a current measuring device as claimed in any one of claims 1 to 9, wherein the optical fiber current sensor (1) of the current measuring device is used to be wound around the electrolytic cell busbar (7).

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