A high-density capacitor array single bus multipoint temperature measurement device for an electric arc furnace

Abstract

The utility model discloses a kind of high-density capacitor array single bus multipoint temperature measuring devices for submerged arc furnace, it is related to the technical field of industrial temperature measurement, to solve the problem that existing technology cannot satisfy the fine temperature field comprehensive monitoring demand of high-density capacitor group for submerged arc furnace. The present application includes electric appliance cabinet, multiple capacitor units are installed in electric appliance cabinet, each capacitor unit is formed by multiple sub-capacitors in the way of plug-in, digital temperature sensor is installed in each capacitor unit, and digital temperature sensor is installed at the plug-in gap between two adjacent sub-capacitors. The present application distributes digital temperature sensor in the key heating position of each capacitor unit, and adopts single bus topology to connect all sensors in parallel into acquisition module, constructs a set of fine, high-reliability and early warning capability temperature panoramic monitoring system, realizes early warning, so as to avoid capacitor damage and cause chain failure due to overheating accumulation.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial electrical equipment safety, specifically a high-density capacitor array single-bus multi-point temperature measurement device for electric arc furnaces. Background Technology

[0002] As a typical large-capacity nonlinear load, the stable operation of an electric arc furnace relies on a matching capacitor bank for reactive power compensation. Due to the huge reactive power demand of the electric arc furnace itself, the compensation capacitor bank must have an extremely high capacity density, that is, integrate a large number of capacitor units within a limited installation space.

[0003] These high-density capacitor cells operate under harsh conditions of high voltage, high current, and extremely high and drastically fluctuating ambient temperatures, resulting in significant heat generation and a very high risk of overheating failure. Currently, the industry commonly uses traditional single-point temperature measurement methods, which have the following inherent drawbacks: First, they struggle to capture temperature gradients and localized hot spots within the capacitor and between clusters, leading to inaccurate overall thermal status assessments. Second, in the context of high-temperature fluctuations, sparse signals cannot effectively distinguish between abnormal internal heating and environmental thermal noise, easily causing false alarms or missed alarms. Third, for typical high-density capacitor banks, traditional solutions face bottlenecks in wiring, cost, and channel capacity. Furthermore, capacitor failure typically presents as a gradual temperature rise process. Traditional methods, lacking a global perspective, cannot identify and locate abnormal temperature rise trends in specific cells early on, missing crucial intervention opportunities. By the time the fault becomes apparent, permanent damage to the device has often occurred, potentially triggering a chain reaction that jeopardizes the stable operation of the entire capacitor bank, leading to unplanned downtime and significant economic losses.

[0004] Therefore, existing technologies cannot meet the requirements for comprehensive temperature field monitoring of high-density capacitor banks used in submerged arc furnaces, which requires precise, interference-resistant, full-view, and early warning capabilities. Utility Model Content

[0005] To address the aforementioned problems, namely the issues raised in the background art, this utility model proposes a high-density capacitor array single-bus multi-point temperature measurement device for a submerged arc furnace. The device includes an electrical cabinet containing multiple capacitor units for providing reactive power compensation to the submerged arc furnace. Each capacitor unit includes a housing and multiple sub-capacitors disposed within the housing. The sub-capacitors are connected in a plug-in manner. Each capacitor unit contains a digital temperature sensor installed at the plug-in gap between two adjacent sub-capacitors. All of the digital temperature sensors are connected to the data acquisition port of the multi-channel temperature acquisition module, the communication interface of the multi-channel temperature acquisition module is connected to the central controller, and the signal output terminal of the central controller is electrically connected to an alarm module.

[0006] The present invention is further configured as follows: the electrical cabinet includes 8 parallel branches, each branch has 6 capacitor units connected in parallel, and all digital temperature sensors in each branch are connected in parallel in a single bus manner to form a branch bus; the multi-channel temperature acquisition module has 8 acquisition channels, and the input end of each acquisition channel is connected to a branch bus to acquire the temperature data of all 6 capacitor units on the corresponding electrical branch.

[0007] A further feature of this invention is that the digital temperature sensor is a DS18B20 integrated digital temperature sensor.

[0008] A further feature of this invention is that each capacitor unit is provided with at least three digital temperature sensors (upper, middle, and lower) arranged along its height direction.

[0009] A further feature of this invention is that the alarm module is an audible and visual alarm.

[0010] A further feature of this invention is that the multi-channel temperature acquisition module uses an STM32 series microcontroller.

[0011] A further feature of this invention is that a wiring hole is provided on the housing of the capacitor unit.

[0012] The beneficial technical effects of this utility model are as follows: By distributing digital temperature sensors at key heat-generating locations in each capacitor unit and connecting all sensors in parallel to the acquisition module using a single-bus topology, a refined, highly reliable, and early warning-capable panoramic temperature monitoring system is constructed. Firstly, it achieves accurate capture and location of the three-dimensional temperature gradient and local overheating points within and between high-density capacitors, overcoming the shortcomings of traditional single-point temperature measurement with large blind spots. Secondly, the single-bus architecture and multi-point data fusion analysis significantly improve the system's anti-interference capability, effectively distinguishing between environmental noise and abnormal heating of the capacitor itself, and greatly reducing false alarms and missed alarms. Thirdly, based on continuous monitoring of temperature rise, it can identify abnormal trends before the temperature reaches the destructive threshold, achieving early warning and providing a critical time window for preventive maintenance, thereby avoiding damage to the capacitor due to overheating accumulation and the triggering of chain failures. Attached Figure Description

[0013] Figure 1 A schematic diagram of the electrical cabinet structure of this utility model is shown.

[0014] Figure 2 A schematic diagram of the capacitor unit of this utility model is shown.

[0015] Figure 3 A schematic diagram of the sub-capacitor connection of this utility model is shown.

[0016] Figure 4 A schematic diagram of the installation of the digital temperature sensor of this utility model is shown.

[0017] Figure 5 A schematic diagram of the electrical connection of this utility model is shown.

[0018] Reference numerals: 1. Electrical cabinet; 2. Capacitor unit; 3. Housing; 4. Sub-capacitor; 5. Digital temperature sensor; 6. Multi-channel temperature acquisition module; 7. Central controller; 8. Alarm module; 9. Wiring hole. Detailed Implementation

[0019] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0020] This utility model proposes a high-density capacitor array single-bus multi-point temperature measurement device for submerged arc furnaces. A specific implementation method is as follows: Please refer to... Figure 1 The electrical cabinet 1 contains a compact arrangement of multiple capacitor units 2 for reactive power compensation. Specifically, a single electrical cabinet 1 contains 48 identical capacitor units 2 connected in parallel. These 48 capacitor units 2 are divided into 8 independent branches in terms of electrical connection, and each branch contains 6 capacitor units 2 connected in parallel.

[0021] Please see Figure 3 The document showcases the internal structure of a capacitor unit 2. Each capacitor unit 2 serves as a basic capacitance compensation unit, comprising a housing 3. Inside the housing 3, 36 cylindrical sub-capacitors 4 are assembled in a 6x6 matrix via their built-in terminals. This high-density arrangement, while improving the utilization of cabinet space, also presents a significant challenge in heat dissipation.

[0022] To accurately monitor temperature rise, this device sets multiple temperature measuring points inside each capacitor unit 2. On each capacitor unit 2, three representative positions—top, middle, and bottom—were selected along the vertical direction. A DS18B20 digital temperature sensor 5 is fixedly installed at the insertion gap between adjacent sub-capacitors 4 at each selected position. Therefore, a total of three digital temperature sensors 5 are installed on a single capacitor unit 2, each monitoring the temperature conditions in its vicinity.

[0023] One of the core features of this device is the use of a highly efficient single-bus topology for sensor networking. The specific connection method is as follows: all digital temperature sensors 5 (i.e., 6 capacitor arrays × 3 / unit = 18 sensors in a certain branch) in each electrical branch (a total of 8 branches) are connected together in parallel to form a single branch bus. This bus aggregates the data from all 18 temperature sensors in that branch.

[0024] The multi-channel temperature acquisition module 6 has eight independent acquisition channels, each with its data acquisition port connected to one of the aforementioned branch buses. Thus, each acquisition channel is responsible for polling and acquiring data from all 18 temperature points within its corresponding electrical branch. Therefore, the multi-channel temperature acquisition module 6 acquires data from a total of 144 temperature points in real time through all eight acquisition channels. The multi-channel temperature acquisition module 6 uses an STM32 series microcontroller, which uploads all collected temperature data to a central controller 7 (e.g., an industrial PLC or industrial PC) via its communication interface. The central controller 7 displays the temperature values ​​and location information (down to the specific branch or the upper / middle / lower part of the capacitor array) of the 144 temperature measurement points in real time and can plot temperature change curves.

[0025] The signal output terminal of the central controller 7 is connected to the alarm module 8. When the central controller 7 determines that the temperature value of any temperature measuring point exceeds the preset safety threshold, or that the temperature change rate is abnormal, it immediately activates the alarm module 8. The alarm module 8 can use an audible and visual alarm or send an alarm signal to the upper-level monitoring system to remind operators to handle the situation promptly, thereby effectively preventing failures caused by capacitor overheating and ensuring the safe and stable operation of the electric arc furnace system. This enables early intervention and preventative maintenance, avoiding damage and cascading failures caused by the accumulation of capacitor overheating.

[0026] The capacitor unit 2 has a wiring hole 9 on its housing 3. The wiring hole 9 not only meets the signal line requirements of the digital temperature sensor 5, but also enhances the air circulation inside the cabinet and improves the heat dissipation effect.

[0027] Although the present invention has been described with reference to preferred embodiments, various modifications can be made to it and components can be replaced with equivalents without departing from the scope of the present invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0028] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A high-density capacitor array single-bus multi-point temperature measurement device for submerged arc furnaces, characterized in that: The device includes an electrical cabinet (1), which is equipped with multiple capacitor units (2) for providing reactive power compensation to the electric arc furnace. Each capacitor unit (2) includes a housing (3) and multiple sub-capacitors (4) disposed within the housing (3). The multiple sub-capacitors (4) are connected by plugging in each other. Each capacitor unit (2) is equipped with a digital temperature sensor (5), which is installed at the plugging gap between two adjacent sub-capacitors (4). All of the digital temperature sensors (5) are connected to the data acquisition port of the multi-channel temperature acquisition module (6), the communication interface of the multi-channel temperature acquisition module (6) is connected to the central controller (7), and the signal output terminal of the central controller (7) is electrically connected to the alarm module (8).

2. The high-density capacitor array single-bus multi-point temperature measuring device for a submerged arc furnace according to claim 1, characterized in that: The electrical cabinet (1) includes 8 parallel branches, each of which has 6 capacitor units (2) connected in parallel. All digital temperature sensors (5) in each branch are connected in parallel in a single bus manner to form a branch bus. The multi-channel temperature acquisition module (6) has 8 acquisition channels. The input terminal of each acquisition channel is connected to a branch bus to acquire the temperature data of all 6 capacitor units (2) on the corresponding electrical branch.

3. The high-density capacitor array single-bus multi-point temperature measuring device for a submerged arc furnace according to claim 1, characterized in that: The digital temperature sensor (5) is a DS18B20 integrated digital temperature sensor.

4. The high-density capacitor array single-bus multi-point temperature measuring device for a submerged arc furnace according to claim 1, characterized in that: Each capacitor unit (2) has at least three digital temperature sensors (5) arranged inside it along its height direction, namely upper, middle and lower.

5. The high-density capacitor array single-bus multi-point temperature measuring device for a submerged arc furnace according to claim 1, characterized in that: The alarm module (8) is an audible and visual alarm.

6. The high-density capacitor array single-bus multi-point temperature measuring device for a submerged arc furnace according to claim 1, characterized in that: The multi-channel temperature acquisition module (6) uses an STM32 series microcontroller.

7. The high-density capacitor array single-bus multi-point temperature measuring device for a submerged arc furnace according to claim 1, characterized in that: The capacitor unit (2) has a wiring hole (9) on its housing (3).

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