A gas environment-based ring main unit control method and system, a terminal and a medium

Abstract

The application relates to a gas environment-based control method and system for a ring main unit, a terminal and a medium, and relates to the field of ring main units. The method comprises the following steps: obtaining a gas concentration value and a branch current value of a monitoring area; judging whether the gas concentration value reaches a preset early warning threshold value; if yes, calculating an expected arc energy according to the branch current values; identifying a safe breakable branch with an expected arc energy less than a gas ignition energy threshold value; controlling the ring main unit to remove a non-key power branch in the safe breakable branch to obtain a remaining safe breakable branch; judging whether a remaining load current value of a main feeder circuit of the remaining safe breakable branch falls below a preset safe current threshold value; if no, controlling the ring main unit to remove a secondary non-key power branch in the remaining safe breakable branch until the remaining load current value falls below the preset safe current threshold value, and cutting off a main feeder switch. The application has the effects of improving power supply safety and reducing explosion risks.

Description

Technical Field

[0001] This application relates to the field of ring main units, and in particular to a control method, system, terminal and medium for ring main units based on a gas environment. Background Technology

[0002] In mines with high gas risk, ring main unit control technology is a key technology supporting the improvement of power supply safety and the reduction of explosion risk.

[0003] In related technologies, the ring main unit control system collects gas concentration values ​​through a single gas sensor installed in the monitoring area. When the gas concentration value exceeds the preset power-off threshold, the main incoming switch of the ring main unit is directly cut off, stopping all power supply. When the gas concentration value drops below the power-on threshold, power supply can be restored only after manual reset.

[0004] Regarding the aforementioned technologies, when controlling the disconnection of ring main units, there are problems such as a single method for handling gas exceeding the limit and insufficient basis for disconnection decisions, which may lead to a forced complete shutdown of the power supply system or the risk of ignition during disconnection operations. Summary of the Invention

[0005] To improve power supply safety and reduce the risk of explosion, this application provides a ring main unit control method, system, terminal, and medium based on a gas environment.

[0006] Firstly, this application provides a ring main unit control method based on a gas environment, employing the following technical solution: A ring main unit control method based on a gas environment includes: Obtain the gas concentration value of the monitoring area and the branch current value of each power supply branch; Determine whether the gas concentration value has reached the preset warning threshold; If so, calculate the expected arc energy of each power-consuming branch based on the current value of each branch; The expected arc energy of each power branch is compared with the preset gas ignition energy threshold to identify safe disconnectable branches whose expected arc energy is less than the gas ignition energy threshold. The control ring main unit disconnects the non-critical power supply branches in the safe disconnectable branches to obtain the remaining safe disconnectable branches; Determine whether the residual load current value of the main feeder circuit of the remaining safe disconnectable branch has dropped below the preset safe current threshold. If not, the control ring main unit will disconnect the secondary non-critical power supply branches in the remaining safe disconnectable branches until the remaining load current value drops below the preset safe current threshold and the main power supply switch is disconnected.

[0007] By adopting the above technical solution, real-time data on methane concentration, total load current of the main power supply circuit, and current distribution of each branch are collected in the mine monitoring area. This data is then matched with the arc energy model and the methane ignition threshold for analysis to identify power branches that can be safely disconnected. Non-critical loads are then cut off in priority, ultimately achieving safe load reduction in the main circuit and reliable disconnection of the main switch. This solution effectively avoids the problems of blindly cutting off or insufficiently cutting off power in high-methane environments using traditional ring main units, improves the safety response accuracy of the power supply and distribution system, significantly reduces the risk of methane explosions, and ensures operational safety and power supply continuity.

[0008] Optionally, coal and petrological parameters and historical desorption response characteristics of the monitoring area corresponding to each non-critical power branch can be obtained. The coal and petrological parameters include coal porosity, gas adsorption saturation and original gas pressure. The historical desorption response characteristics include gas concentration surge and rise delay time. For each monitoring area, based on coal and petrological geological parameters and historical desorption response characteristics, the peak value of gas concentration increase corresponding to gas desorption is calculated; The predicted gas concentration value is obtained by superimposing the peak value of the sudden increase in gas concentration onto the gas concentration value. Determine whether the predicted gas concentration value exceeds the preset lower gas explosion limit threshold; If so, the load current values ​​of all non-critical power branches associated with the monitoring area shall be reduced to the minimum required level. Continuously monitor the gas concentration values ​​of the monitoring areas corresponding to each non-critical power branch, and calculate the rate of change of gas concentration; When the rate of change of gas concentration is lower than the preset stable threshold and the gas concentration value drops back to a safe level, repeat the above five steps.

[0009] By adopting the above technical solution, before cutting off non-critical power branches, the system integrates coal and petrological parameters with historical desorption response characteristics to predict sudden increases in gas concentration caused by desorption, thus assessing potential explosion risks in advance. When the predicted concentration may exceed limits, the current in the relevant branches is reduced to the minimum operating level to prevent gas explosions caused by electric arcs or high temperatures. Simultaneously, after the gas concentration stabilizes and falls back to a safe range, the risk assessment process is repeated. This solution effectively improves the ability to predict and respond to sudden gas outbursts, reducing safety hazards and production interruptions caused by delayed or excessive power outages.

[0010] Optionally, the ventilation status of the monitoring area corresponding to each non-critical power branch can be obtained, including local air volume, wind speed and ventilation equipment operation status; Determine whether the ventilation status meets the preset safe ventilation conditions; If not, calculate the minimum maintainable air volume that the monitored area can sustain; Compare the minimum sustainable air volume with the required air volume corresponding to the gas outburst intensity; If the minimum maintainable air volume is not less than the required air volume, then load reduction operations are permitted for non-critical power branches.

[0011] By adopting the above technical solution, the ventilation status and gas emission intensity of the monitoring area corresponding to non-critical power branches are obtained. The feasibility of load reduction is assessed by combining safe ventilation conditions and required air volume, and a decision is made on whether to implement branch load reduction operations under the premise of ensuring ventilation safety. This solution significantly improves the safety of mine power control and effectively avoids the risk of gas accumulation caused by blind load reduction.

[0012] Optionally, the upstream intake airway, adjacent airway, and shared return air section of the monitoring area can be obtained to construct a local ventilation network topology map; Based on the local ventilation network topology, identify whether there are serial ventilation paths in the monitoring area; If not, the minimum maintainable air volume will be used as the baseline ventilation volume; If so, obtain the real-time air volume and gas concentration of the upstream intake airway in the series ventilation path, and combine the series ventilation path loss coefficient to attenuate and correct the minimum sustainable air volume, and generate the corrected minimum sustainable air volume. Based on the wind speed in the upstream intake airway and the length of the series ventilation path, the transmission delay of gas migration to the downstream monitoring area is calculated. The downstream gas outburst intensity is predicted based on the transmission delay, and the corrected air demand is generated.

[0013] By adopting the above technical solution, a local ventilation network topology map of the monitoring area is constructed, serial ventilation paths are identified, and the minimum sustainable air volume is corrected by combining upstream air volume, gas concentration, and air path loss. Simultaneously, the downstream outburst intensity is predicted based on gas migration and transmission delay, generating a corrected required air volume adapted to the actual risk. This solution significantly improves the accuracy of mine ventilation control and effectively avoids safety hazards caused by insufficient air volume or delayed response.

[0014] Optionally, the first gas concentration in the bottom area of ​​the ring main unit and the second gas concentration in the upper area of ​​the ring main unit are obtained; Calculate the concentration ratio of the first gas concentration to the second gas concentration; Determine whether the concentration ratio is greater than the preset local retention determination threshold; If so, it is determined that there is a risk of local gas deposition in the ring main unit, and the gradient of the difference between the first gas concentration and the second gas concentration is calculated; Calculate the gas accumulation intensity based on the differential gradient and cabinet height; If the gas accumulation intensity exceeds the preset eddy current intensity threshold, the maximum allowable breaking current limit of the ring main unit will be reduced according to the preset derating rules based on the gas accumulation intensity.

[0015] By adopting the above technical solution, gas concentration data at the bottom and top of the ring main unit are obtained. Combined with preset thresholds, the risk of localized gas deposition is identified, and a gas gradient index is calculated based on the concentration gradient and the unit structure. When the index exceeds the safety limit, the maximum allowable breaking current limit of the ring main unit is reduced according to regulations. This solution significantly improves the response capability to gas accumulation risks and effectively avoids combustion and explosion accidents caused by gas accumulation.

[0016] Optionally, acquire temperature data for at least two key heat-generating components within the ring main unit. These key heat-generating components may include busbar joints, circuit breaker contacts, or cable terminals. Based on the temperature data and installation height of each key heating component, the contribution value of each key heating component to the vertical thermal buoyancy inside the ring main unit is calculated. The thermal buoyancy factor is obtained by weighted summation of the contribution values ​​of all key heat-generating components. Based on the thermal buoyancy factor, the preset thermal buoyancy-gas offset compensation mapping relationship is queried to obtain the concentration correction coefficient; Using the concentration correction coefficient, offset compensation is performed on the first gas concentration and the second gas concentration respectively to obtain the corrected first gas concentration and second gas concentration.

[0017] By adopting the above technical solution, the temperature and installation height information of key heat-generating components within the ring main unit are collected. The contribution value is calculated by combining the ambient reference temperature and height, and a thermal buoyancy factor is obtained by weighting the contribution value. Furthermore, the gas concentration in the upper and lower regions is corrected based on a preset thermal buoyancy-gas offset compensation mapping relationship. This solution significantly improves the accuracy of gas concentration monitoring, effectively eliminates gas stratification interference caused by equipment heating, and reduces misjudgments due to thermal buoyancy.

[0018] Optionally, the attitude information of the ring main unit can be obtained, including the tilt angle and tilt direction of the ring main unit relative to the direction of gravity. Based on the tilt angle and tilt direction, the installation height of each key heating component is converted into the effective vertical height of each key heating component in the direction of gravity; Based on the tilt orientation, determine the spatial projection of the dominant direction of vertical thermal buoyancy inside the cabinet, and use the spatial projection as the dominant direction vector of vertical thermal buoyancy. Based on the effective vertical height and dominant direction vector, the contribution of each key heat-generating component to the vertical thermal buoyancy within the ring main unit is recalculated.

[0019] By employing the above technical solution, the installation posture information of the ring main unit is obtained. Combined with the spatial location of key heat-generating components and the dominant direction of thermal buoyancy, the effective thermal buoyancy contribution in the direction of gravity is calculated, and the gas concentration distribution is corrected accordingly. This solution significantly improves the accuracy of gas monitoring under non-vertical installation conditions and reduces the risk of misjudgment due to gas stratification caused by cabinet tilting.

[0020] Secondly, this application provides a ring main unit control system based on a gas environment, which adopts the following technical solution: A ring main unit control system based on a gas environment includes: The acquisition module is used to acquire concentration values, total load current values ​​of the main power supply circuit, and branch current distribution of each power-consuming branch. A memory for storing the program of the ring main unit control method based on the gas environment; The processor and the program in the memory can be loaded and executed by the processor to implement the ring main unit control method based on the gas environment.

[0021] By adopting the above technical solution, the module acquires real-time data on gas concentration, total load current of the main power supply circuit, and branch current distribution of each power branch within the ring main unit. The processor executes a safety status assessment and dynamic control strategy based on multi-source parameter fusion, and the memory continuously updates and optimizes the correlation between current and risk, as well as the fault response characteristics corresponding to gas concentration. This achieves intelligent processing of the entire process from environmental perception and electrical monitoring to safety decision-making, significantly improving the adaptability to complex working conditions and control reliability while ensuring the safe operation of the ring main unit, providing an efficient and intelligent safety management solution for mining ring main units.

[0022] Thirdly, this application provides a smart terminal, which adopts the following technical solution: A smart terminal includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described above.

[0023] Fourthly, this application provides a computer storage medium capable of storing corresponding programs, which facilitates improved power supply safety and reduced explosion risk, and adopts the following technical solution: A computer-readable storage medium storing a computer program that can be loaded by a processor and executed by any of the above-mentioned ring main unit control methods based on a gas environment.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. Real-time data collection of methane concentration, total load current of the main power supply circuit, and current distribution of each branch in the mine monitoring area. This data, combined with an arc energy model and methane ignition threshold, is used for matching analysis to identify power branches that can be safely disconnected. Non-critical loads are then cut off in priority, ultimately achieving safe load reduction in the main circuit and reliable disconnection of the main switch. This solution effectively avoids the problems of blindly or insufficiently cutting off power in high-methane environments using traditional ring main units, improves the safety response accuracy of the power supply and distribution system, significantly reduces the risk of methane explosions, and ensures operational safety and power supply continuity. 2. Before cutting off non-critical power supply branches, the system integrates coal and petrological parameters with historical desorption response characteristics to predict sudden increases in gas concentration caused by desorption, and assesses potential explosion risks in advance. If the predicted concentration may exceed limits, the current in the relevant branches is reduced to the minimum operating level to prevent gas explosions caused by electric arcs or high temperatures. Simultaneously, after the gas concentration stabilizes and falls back to a safe range, the risk assessment process is repeated. This approach effectively improves the ability to predict and respond to sudden gas outbursts, reducing safety hazards and production interruptions caused by delayed or excessive power outages. 3. Collect temperature and installation height information of key heat-generating components within the ring main unit. Combine this with the ambient reference temperature and height to calculate the contribution value. Weight the contribution value to obtain a thermal buoyancy factor, and correct the gas concentration in the upper and lower regions based on a preset thermal buoyancy-gas offset compensation mapping relationship. This scheme significantly improves the accuracy of gas concentration monitoring, effectively eliminates gas stratification interference caused by equipment heating, and reduces misjudgments due to thermal buoyancy. Attached Figure Description

[0025] Figure 1 This is a flowchart illustrating a ring main unit control method based on a gas environment, as provided in an embodiment of this application.

[0026] Figure 2 This is a flowchart illustrating a method for reducing the load on a ring main unit based on a gas surge prediction, as provided in an embodiment of this application.

[0027] Figure 3 This is a schematic flowchart of a ventilation-coordinated ring main unit load reduction method provided in an embodiment of this application.

[0028] Figure 4 This is a flowchart illustrating a method for predicting the air volume required for series ventilation provided in an embodiment of this application.

[0029] Figure 5 This is a schematic flowchart of a gas deposition and load reduction method for a ring main unit provided in an embodiment of this application.

[0030] Figure 6 This is a schematic flowchart of a gas detection method for a ring main unit with thermal buoyancy compensation provided in an embodiment of this application.

[0031] Figure 7 This is a flowchart illustrating a method for monitoring gas in a ring main unit based on attitude information, provided in an embodiment of this application.

[0032] Figure 8 This is a schematic diagram of a ring main unit control system based on a gas environment, provided in an embodiment of this application. Detailed Implementation

[0033] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figures 1 to 8 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0034] This application discloses a ring main unit control method based on a gas environment. (Refer to...) Figure 1 The method includes: Step S101: Obtain the gas concentration value of the monitoring area and the branch current value of each power supply branch.

[0035] The methane concentration value is the volume percentage of methane gas in the air, used to indicate the degree of methane accumulation in the monitored area, and is generally obtained through a methane sensor.

[0036] Branch current distribution refers to the magnitude of the current flowing through each power branch in the monitoring area, reflecting the actual power consumption status of each power branch. It is generally obtained by installing current transformers on each branch.

[0037] Step S102: Determine whether the gas concentration value has reached the preset warning threshold.

[0038] The purpose of this assessment is to identify potential risks of gas accumulation and prevent explosions caused by excessively high concentrations.

[0039] Step S103: If so, calculate the expected arc energy of each power-consuming branch based on the current value of each branch.

[0040] Expected arc energy refers to the energy released by an arc that may be generated in an electrical branch under specific current conditions.

[0041] The expected arc energy is calculated using the formula E=U×I×t, where E is the expected arc energy, U is the arc voltage, I is the branch current value, and t is the arc duration.

[0042] If the gas concentration value does not reach the preset warning threshold, the gas concentration value will continue to be monitored, and the arc energy calculation will not be performed.

[0043] Step S104: Compare the expected arc energy of each power branch with the preset gas ignition energy threshold, and identify safe disconnectable branches whose expected arc energy is less than the gas ignition energy threshold.

[0044] A safe disconnectable branch is a branch whose expected arc energy is below the gas ignition energy threshold and will not ignite the gas in the environment during a disconnection operation.

[0045] By comparing the expected arc energy of each power branch with the preset gas ignition energy threshold one by one, if the expected arc energy of a power branch is less than the ignition energy threshold, the power branch is determined to be a safe disconnectable branch.

[0046] Step S105: Control the ring main unit to disconnect the non-critical power supply branches in the safe disconnectable branches to obtain the remaining safe disconnectable branches.

[0047] Non-critical power supply branches refer to power supply branches that can be temporarily disconnected without affecting the normal operation of critical equipment, provided that basic operation and safety are ensured.

[0048] The remaining safe disconnectable branch refers to the critical power branch that remains in the ring main unit after the non-critical power branch is cut off, and whose expected arc energy is below the gas ignition energy threshold and which needs to continue to supply power.

[0049] Step S106: Determine whether the remaining load current value of the main feeder circuit of the remaining safe disconnectable branch has dropped below the preset safe current threshold.

[0050] The judgment is to ensure that after cutting off non-critical power branches, the load on the main power supply circuit is reduced to a safe level that will not ignite the gas.

[0051] Step S107: If not, control the ring main unit to disconnect the secondary non-critical power supply branches in the remaining safe disconnectable branches until the remaining load current value drops below the preset safe current threshold, and disconnect the main power supply switch.

[0052] Secondary non-critical power branches refer to power branches with lower priority among the remaining safe disconnectable branches after non-critical power branches have been disconnected, which can still be further disconnected while ensuring critical loads.

[0053] If the remaining load current value of the main feeder circuit of the remaining safe disconnectable branch drops below the preset safe current threshold, the main feeder switch can be directly disconnected.

[0054] By adopting the above technical solution, real-time data on methane concentration, total load current of the main power supply circuit, and current distribution of each branch are collected in the mine monitoring area. This data is then matched with the arc energy model and the methane ignition threshold for analysis to identify power branches that can be safely disconnected. Non-critical loads are then cut off in priority, ultimately achieving safe load reduction in the main circuit and reliable disconnection of the main switch. This solution effectively avoids the problems of blindly cutting off or insufficiently cutting off power in high-methane environments using traditional ring main units, improves the safety response accuracy of the power supply and distribution system, significantly reduces the risk of methane explosions, and ensures operational safety and power supply continuity.

[0055] This application discloses a method for reducing the load on a ring main unit based on the prediction of a sudden increase in gas volume. (Refer to...) Figure 2 The method includes: Step S201: Obtain the coal and rock geological parameters and historical desorption response characteristics of the monitoring area corresponding to each non-critical power branch. The coal and rock geological parameters include coal porosity, gas adsorption saturation and original gas pressure. The historical desorption response characteristics include the sudden increase in gas concentration and the rise delay time.

[0056] Coal and rock geological parameters refer to basic geological indicators that reflect the gas occurrence state in coal and rock, and are used to represent its storage capacity and release potential. Among them, coal porosity refers to the proportion of pore volume to total volume in coal, reflecting the size of gas storage space; gas adsorption saturation represents the ratio of the current amount of gas adsorbed by the coal body to its maximum adsorption capacity, reflecting the adsorption state; and original gas pressure refers to the pressure of gas that originally existed inside the coal and rock.

[0057] Historical desorption response characteristics refer to the dynamic characteristics of gas release exhibited in the monitored area during previous coal mining operations. These characteristics reflect the severity and speed of gas desorption after coal and rock disturbance. Specifically, the gas concentration surge refers to the magnitude of the short-term increase in gas concentration within the monitored area during desorption, while the rise delay time refers to the time interval between the onset of a significant increase in gas concentration.

[0058] Step S202: For each monitoring area, based on coal and petrological parameters and historical desorption response characteristics, calculate the peak value of gas concentration increase corresponding to the gas desorption amount.

[0059] Gas desorption refers to the volume of gas released from adsorbed gas in coal and rock due to pressure reduction or structural damage.

[0060] The peak value of gas concentration surge refers to the highest concentration value reached at the monitoring point during the gas desorption process due to the rapid increase in gas concentration caused by a large amount of desorption in a short period of time.

[0061] The pre-trained desorption prediction model takes the coal and rock geological parameters and historical desorption response characteristics of each monitoring area as input. Based on the learned nonlinear mapping relationship, the model outputs the expected amount of gas desorption under the corresponding conditions, and calculates the peak gas concentration surge that may be caused by this desorption amount at the monitoring point by combining ventilation conditions and space volume.

[0062] Step S203: Superimpose the peak value of the sudden increase in gas concentration onto the gas concentration value to obtain the predicted gas concentration value.

[0063] The predicted gas concentration value refers to the future gas concentration level that may be reached by superimposing the peak value of the sudden increase in concentration caused by coal and rock desorption on the current gas concentration.

[0064] Step S204: Determine whether the predicted gas concentration value exceeds the preset lower limit threshold for gas explosion.

[0065] The purpose of this assessment is to identify in advance whether the gas concentration may reach a level that poses a flammable or explosive risk.

[0066] Step S205: If so, the load current values ​​of all non-critical power branches associated with the monitoring area are reduced to the minimum required level.

[0067] Reducing the load current of all non-critical power branches to the minimum required level is to minimize the risk of electrical sparks while ensuring basic operation. This is typically achieved by using a soft starter to regulate the supply voltage of non-critical power branches, gradually reducing their operating current to the minimum level required to maintain basic functionality.

[0068] If not, maintain the current operating status of each non-critical power branch.

[0069] Step S206: Continuously monitor the gas concentration value of the monitoring area corresponding to each non-critical power branch, and calculate the rate of change of gas concentration.

[0070] The rate of change of methane concentration refers to the magnitude of increase or decrease in methane concentration in a monitored area per unit time. It is obtained by calculating the ratio of the concentration difference per unit time to the time interval.

[0071] Step S207: When the rate of change of gas concentration is lower than the preset stable threshold and the gas concentration value drops back to a safe level, repeat the above five steps.

[0072] When the rate of change of gas concentration is detected to be lower than the set stable threshold and the concentration has dropped to a safe range, repeat the aforementioned five steps to continuously ensure electrical safety.

[0073] By adopting the above technical solution, before cutting off non-critical power branches, the system integrates coal and petrological parameters with historical desorption response characteristics to predict sudden increases in gas concentration caused by desorption, thus assessing potential explosion risks in advance. When the predicted concentration may exceed limits, the current in the relevant branches is reduced to the minimum operating level to prevent gas explosions caused by electric arcs or high temperatures. Simultaneously, after the gas concentration stabilizes and falls back to a safe range, the risk assessment process is repeated. This solution effectively improves the ability to predict and respond to sudden gas outbursts, reducing safety hazards and production interruptions caused by delayed or excessive power outages.

[0074] This application discloses a method for reducing the load on a ring main unit with coordinated ventilation. (Refer to...) Figure 3 The method includes: Step S301: Obtain the ventilation status of the monitoring area corresponding to each non-critical power branch. The ventilation status includes local air volume, wind speed and the operating status of ventilation equipment.

[0075] Ventilation status refers to comprehensive parameters reflecting air circulation within the monitoring area. Local air volume is calculated by combining wind speed sensors with the cross-sectional area of ​​the tunnel, wind speed is directly measured by wind speed sensors, and the operating status of ventilation equipment is obtained by collecting information such as fan start / stop, frequency, current or fault signals through the equipment control system.

[0076] Step S302: Determine whether the ventilation status meets the preset safe ventilation conditions.

[0077] The purpose of this assessment is to ensure that the air volume and velocity within the monitored area are sufficient to dilute harmful gases such as methane and maintain a safe working environment.

[0078] Step S303: If not, calculate the minimum maintainable airflow that the monitoring area can sustain.

[0079] Minimum sustainable airflow refers to the minimum airflow maintained in the monitored area under the current ventilation conditions to prevent the accumulation of harmful gases such as methane.

[0080] The minimum maintainable air volume can be expressed by the formula: Q min =q / (C max -C0) is calculated; where Q is... min The minimum sustainable air volume is represented by q, which represents the gas emission rate of the monitored area, and C is the gas emission rate of the monitored area. max C0 indicates the maximum permissible gas concentration limit according to safety regulations, and C0 indicates the gas concentration contained in the airflow entering the monitoring area before reaching the area.

[0081] If the ventilation conditions meet the preset safe ventilation requirements, the ventilation equipment will operate normally.

[0082] Step S304: Compare the minimum sustainable air volume with the required air volume corresponding to the gas outburst intensity.

[0083] The comparison is to determine whether the current ventilation capacity is sufficient to dilute the gas to a safe concentration.

[0084] Step S305: If the minimum maintainable air volume is not less than the required air volume, then a load reduction operation is allowed for non-critical power branches.

[0085] When the minimum maintainable air volume is not less than the air volume required for gas outflow, it indicates that the ventilation equipment has sufficient safety margin, and at this time, it is permissible to perform load reduction operations on non-critical power branches.

[0086] If the minimum maintainable air volume is less than the required air volume, it indicates that the current ventilation capacity is insufficient to safely dilute the gas. It is necessary to prohibit the deloading of non-critical power branches and increase the air volume of the ventilation equipment to meet safety requirements.

[0087] By adopting the above technical solution, the ventilation status and gas emission intensity of the monitoring area corresponding to non-critical power branches are obtained. The feasibility of load reduction is assessed by combining safe ventilation conditions and required air volume, and a decision is made on whether to implement branch load reduction operations under the premise of ensuring ventilation safety. This solution significantly improves the safety of mine power control and effectively avoids the risk of gas accumulation caused by blind load reduction.

[0088] This application discloses a method for predicting the air volume demand of series ventilation systems. (Refer to...) Figure 4 The method includes: Step S401: Obtain the upstream intake airway, adjacent airway and shared return air section of the monitoring area, and construct a local ventilation network topology map.

[0089] A local ventilation network topology diagram is a structural diagram that reflects the airflow path and the logical relationship between the airways based on the actual ventilation connection relationship between the upstream intake airway, adjacent airways and shared return air section associated with the monitoring area. It is used to represent the ventilation relationship and airflow direction between the airways in a local area.

[0090] Step S402: Based on the local ventilation network topology map, identify whether there are serial ventilation paths in the monitoring area.

[0091] A series ventilation path refers to an airflow that flows sequentially through two or more air-using areas, with the return air from the previous area directly serving as the intake air for the next area.

[0092] By analyzing the connection relationships and airflow direction of each roadway node in the local ventilation network topology diagram, it is determined whether the return air of the monitoring area directly enters another air-using area as its intake air. If there is such a path where airflow is sequentially connected, it is identified as a series ventilation path.

[0093] Step S403: If not, use the minimum sustainable air volume as the baseline ventilation volume.

[0094] The baseline ventilation volume refers to the minimum maintainable air volume that meets the safety and operational requirements of the monitoring area after confirming that there are no series ventilation paths.

[0095] When there is no series ventilation path in the monitored area, the minimum maintainable air volume is used as the benchmark ventilation air volume to ensure safe ventilation needs while avoiding air volume redundancy.

[0096] Step S404: If yes, obtain the real-time air volume and gas concentration of the upstream intake airway in the series ventilation path, and combine the series ventilation path loss coefficient to attenuate and correct the minimum sustainable air volume to generate the corrected minimum sustainable air volume.

[0097] The series ventilation path loss coefficient refers to the proportion of effective air volume attenuation caused by factors such as frictional resistance, local resistance and air leakage when airflow passes through the series ventilation path. It is used to represent the transmission efficiency of the actual usable air volume from the upstream intake airway to the target area.

[0098] The minimum sustainable airflow is multiplied by the series ventilation path loss coefficient and adjusted in conjunction with the real-time airflow parameters and gas concentration of the upstream intake roadway. The loss coefficient reflects the degree of airflow attenuation in the series path, ultimately yielding the corrected minimum sustainable airflow. For example, assuming the minimum sustainable airflow is 1000 m³ / min and the series ventilation path loss coefficient is 0.85; if the monitored real-time airflow in the upstream roadway is 900 m³ / min and the gas concentration is 0.7%, and the required airflow to dilute to the safety limit (e.g., 1.0%) according to regulations is 950 m³ / min, then 1000 is first multiplied by 0.85 to get 850 m³ / min, and then compared with the required dilution airflow of 950 m³ / min. The larger value of 950 m³ / min is taken as the corrected minimum sustainable airflow.

[0099] Step S405: Calculate the transmission delay of gas migration to the downstream monitoring area based on the wind speed in the upstream air intake tunnel and the length of the series ventilation path.

[0100] Transmission delay refers to the time required for gas to migrate from the upstream roadway to the downstream monitoring area with the airflow, which is determined by the wind speed in the upstream roadway and the length of the series ventilation path.

[0101] Step S406: Based on the transmission delay, predict the downstream gas outburst intensity and generate the corrected air demand.

[0102] The downstream gas concentration is corrected by using a pre-established prediction model: the measured upstream gas concentration is used as input, and the transmission delay is calculated by combining parameters such as roadway length and wind speed. Factors such as airflow dilution and outflow along the way are taken into account to attenuate or enhance the upstream data, thereby predicting the actual concentration of gas when it reaches the downstream. Then, the corrected air volume is determined according to the gas concentration-required air volume comparison table.

[0103] By adopting the above technical solution, a local ventilation network topology map of the monitoring area is constructed, serial ventilation paths are identified, and the minimum sustainable air volume is corrected by combining upstream air volume, gas concentration, and air path loss. Simultaneously, the downstream outburst intensity is predicted based on gas migration and transmission delay, generating a corrected required air volume adapted to the actual risk. This solution significantly improves the accuracy of mine ventilation control and effectively avoids safety hazards caused by insufficient air volume or delayed response.

[0104] This application discloses a method for reducing gas deposition in a ring main unit. (Refer to...) Figure 5 The method includes: Step S501: Obtain the first gas concentration in the bottom area of ​​the ring main unit and the second gas concentration in the upper area of ​​the ring main unit.

[0105] The first gas concentration refers to the gas concentration measured in the bottom area of ​​the ring main unit. It is usually collected by a gas sensor installed at a distance from the bottom of the unit and is used to reflect whether there is gas accumulation at a low point inside the unit.

[0106] The second gas concentration refers to the gas concentration measured in the upper area of ​​the ring main unit. It is usually obtained by a gas sensor installed on the inner wall of the unit, and is used to indicate the gas distribution at higher levels inside the unit.

[0107] Step S502: Calculate the concentration ratio of the first gas concentration to the second gas concentration.

[0108] The concentration ratio is the value obtained by dividing the first gas concentration by the second gas concentration, and it is used to indicate the degree of uneven distribution of gas in the vertical direction within the ring main unit.

[0109] Step S503: Determine whether the concentration ratio is greater than the preset local storage determination threshold.

[0110] The purpose of this assessment is to identify whether gas is abnormally accumulating in a certain area of ​​the cabinet due to poor ventilation, thereby promptly detecting potential localized gas accumulation risks.

[0111] Step S504: If yes, then determine that there is a risk of local gas deposition in the ring main unit, and calculate the gradient of the difference between the first gas concentration and the second gas concentration.

[0112] The differential gradient refers to the numerical difference between the first and second gas concentrations. It is used to quantify the degree of abrupt change in gas concentration in the vertical direction within the ring network cabinet, reflecting the severity of local deposition.

[0113] If the concentration ratio is not greater than the preset local accumulation judgment threshold, it is considered that the gas distribution in the ring network cabinet is uniform and there is no obvious risk of local deposition, and normal monitoring can continue.

[0114] Step S505: Calculate the gas accumulation intensity based on the difference gradient and cabinet height.

[0115] Gas accumulation intensity is calculated based on the difference gradient of gas concentration and the height of the ring main unit, and is used to represent the degree of gas accumulation in the vertical direction inside the unit.

[0116] Step S506: If the gas accumulation intensity exceeds the preset eddy current intensity associated threshold, the maximum allowable breaking current limit of the ring main unit is reduced according to the preset derating rule based on the gas accumulation intensity.

[0117] When the gas accumulation intensity exceeds the preset threshold associated with the eddy current intensity, the maximum allowable breaking current limit of the ring main unit is reduced accordingly based on the gas accumulation intensity and a predetermined derating rule.

[0118] By employing the above technical solution, gas concentration data at the bottom and top of the ring main unit is obtained. Combined with preset thresholds, the risk of localized gas deposition is identified, and the gas accumulation intensity is calculated based on the concentration gradient and the unit structure. When the gas accumulation intensity exceeds the safety limit, the maximum allowable breaking current limit of the ring main unit is reduced according to regulations. This solution significantly improves the response capability to gas accumulation risks and effectively avoids combustion and explosion accidents caused by gas accumulation.

[0119] This application discloses a method for detecting gas in a ring main unit with thermal buoyancy compensation. (Refer to...) Figure 6 The method includes: Step S601: Obtain temperature data for at least two critical heat-generating components within the ring main unit. These critical heat-generating components include busbar joints, circuit breaker contacts, or cable terminals.

[0120] Limiting the temperature data to at least two key heat-generating components is to ensure that the acquired temperature data is spatially representative. A single measuring point cannot reflect the overall gradient characteristics of the thermal field inside the ring main unit, while multiple temperature points combined with their installation height are necessary to accurately assess the impact of thermal buoyancy on gas distribution.

[0121] Step S602: Based on the temperature data of each key heating component and the installation height of each key heating component, calculate the contribution value of each key heating component to the vertical thermal buoyancy inside the ring main unit.

[0122] Installation height refers to the vertical position of the key heat-generating component inside the ring main unit relative to the bottom of the unit. As it directly affects the degree of disturbance to the gas distribution during the rising of hot air, the higher the position, the greater its contribution to vertical thermal buoyancy under the same temperature rise.

[0123] The contribution value is used to quantify the impact of each key heating component on the overall vertical thermal buoyancy due to temperature rise and its position in the cabinet. It is reflected by multiplying the difference between the temperature and the ambient reference temperature by a height weighting coefficient that reflects the impact of the installation height. The larger the value, the stronger the driving effect of the key heating component on the upward flow of hot air.

[0124] Step S603: Weight the contribution values ​​of all key heat-generating components to obtain the thermal buoyancy factor.

[0125] The thermal buoyancy factor is a quantitative indicator that comprehensively reflects the overall vertical thermal buoyancy effect of all key heat-generating components in the ring main unit due to the combined effect of temperature rise and position. It is obtained by weighted summation of the contribution values ​​of each component and is used to represent the strength of the upward driving force of hot airflow in the unit.

[0126] Step S604: Based on the thermal buoyancy factor, query the preset thermal buoyancy-gas offset compensation mapping relationship to obtain the concentration correction coefficient.

[0127] The concentration correction coefficient is a compensation parameter used to correct the gas concentration detection deviation caused by uneven gas distribution due to thermal buoyancy in the ring main unit. It is determined based on the thermal buoyancy-gas offset compensation mapping relationship.

[0128] Step S605: Using the concentration correction coefficient, offset compensation is performed on the first gas concentration and the second gas concentration respectively to obtain the corrected first gas concentration and second gas concentration.

[0129] By multiplying the first gas concentration and the second gas concentration by a concentration correction factor, the deviation in the detected value caused by thermal buoyancy is compensated, thereby obtaining the corrected first gas concentration and second gas concentration.

[0130] By adopting the above technical solution, the temperature and installation height information of key heat-generating components within the ring main unit are collected. The contribution value is calculated by combining the ambient reference temperature and height, and a thermal buoyancy factor is obtained by weighting the contribution value. Furthermore, the gas concentration in the upper and lower regions is corrected based on a preset thermal buoyancy-gas offset compensation mapping relationship. This solution significantly improves the accuracy of gas concentration monitoring, effectively eliminates gas stratification interference caused by equipment heating, and reduces misjudgments due to thermal buoyancy.

[0131] This application discloses a method for monitoring gas in a ring main unit based on attitude information. (Refer to...) Figure 7 The method includes: Step S701: Obtain the attitude information of the ring main unit, which includes the tilt angle and tilt direction of the ring main unit relative to the direction of gravity.

[0132] Attitude information refers to the degree and direction of tilt of the ring main unit relative to the vertical in its actual state, reflecting whether the unit is tilted to one side. The tilt angle is the angle between the central axis of the ring main unit and the vertical direction, indicating the degree to which the unit deviates from its upright position. The tilt azimuth refers to the horizontal direction in which the unit is tilted, usually using true north as a reference, and expressed in azimuth angles from 0° to 360°.

[0133] Step S702: Based on the tilt angle and tilt orientation, convert the installation height of each key heating component into the effective vertical height of each key heating component in the direction of gravity.

[0134] Effective vertical height refers to the equivalent height calculated by converting the original installation height of key heat-generating components inside the ring main unit into the actual vertical direction, taking into account the tilt angle and orientation of the unit.

[0135] The installation height coordinates of each key heat-generating component are projected onto the direction of gravity using trigonometric functions. Specifically, the tilt angle of the cabinet is used as the deflection angle, and the projection plane is determined by the tilt orientation. This allows the equivalent height of the component in the true vertical direction to be calculated, i.e., the effective vertical height. For example, if the installation height of a key heat-generating component in the ring main unit coordinate system is h = 1.0m, and the ring main unit is tilted eastward (azimuth angle of 90°) at an angle of θ = 30°, then its effective vertical height in the direction of gravity is h_eff = h·cosθ ≈ 0.866m. If the tilt orientation is not due east but any direction, the installation position must first be projected onto the tilt plane, and then the effective vertical height is calculated in the same way.

[0136] Step S703: Based on the tilt orientation, determine the spatial projection of the dominant direction of vertical thermal buoyancy inside the cabinet, and use the spatial projection as the dominant direction vector of vertical thermal buoyancy.

[0137] The dominant direction vector of vertical thermal buoyancy, i.e., spatial projection, refers to the direction vector of thermal buoyancy in the actual gravity direction, which is transformed into the corresponding direction vector in the coordinate system of the cabinet itself according to the tilt orientation of the ring main unit. It represents the actual dominant flow path of thermal buoyancy in the cabinet.

[0138] Step S704: Based on the effective vertical height and dominant direction vector, recalculate the contribution value of each key heat-generating component to the vertical thermal buoyancy in the ring main unit.

[0139] The contribution of each key heat-generating component to the vertical thermal buoyancy within the ring main unit is recalculated: First, the difference between the component's temperature and the preset ambient reference temperature is calculated; then, the projected distance of the component along the dominant direction of vertical thermal buoyancy to the reference plane is determined; next, this projected distance is divided by the effective vertical height of the ring main unit in that direction to obtain a normalized height weighting coefficient; finally, the temperature difference is multiplied by the height weighting coefficient, and the result is the new contribution of the component to the vertical thermal buoyancy.

[0140] By employing the above technical solution, the installation posture information of the ring main unit is obtained. Combined with the spatial location of key heat-generating components and the dominant direction of thermal buoyancy, the effective thermal buoyancy contribution in the direction of gravity is calculated, and the gas concentration distribution is corrected accordingly. This solution significantly improves the accuracy of gas monitoring under non-vertical installation conditions and reduces the risk of misjudgment due to gas stratification caused by cabinet tilting.

[0141] Based on the same inventive concept, this application provides a ring main unit control system based on a gas environment. Please refer to [link / reference]. Figure 8 The system includes: Step S801: Acquisition module, used to acquire concentration value, total load current value of main power supply circuit and branch current distribution of each power-consuming branch; Step S802: Memory, used to store the program of the ring main unit control method based on gas environment; Step S803: The processor can load and execute the program in the memory to implement the gas environment-based ring main unit control method.

[0142] By adopting the above technical solution, the module acquires real-time data on gas concentration, total load current of the main power supply circuit, and branch current distribution of each power branch within the ring main unit. The processor executes a safety status assessment and dynamic control strategy based on multi-source parameter fusion, and the memory continuously updates and optimizes the correlation between current and risk, as well as the fault response characteristics corresponding to gas concentration. This achieves intelligent processing of the entire process from environmental perception and electrical monitoring to safety decision-making, significantly improving the adaptability to complex working conditions and control reliability while ensuring the safe operation of the ring main unit, providing an efficient and intelligent safety management solution for mining ring main units.

[0143] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0144] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as a ring main unit control method based on a gas environment.

[0145] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0146] Based on the same inventive concept, this application provides an intelligent terminal, including a memory and a processor. The memory stores a computer program that can be loaded and executed by the processor to control a ring main unit based on a gas environment.

[0147] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0148] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A ring main unit control method based on a gas environment, characterized in that, include: Obtain the gas concentration value of the monitoring area and the branch current value of each power supply branch; Determine whether the gas concentration value has reached the preset warning threshold; If so, calculate the expected arc energy of each power-consuming branch based on the branch current value; The expected arc energy of each power branch is compared with the preset gas ignition energy threshold to identify safe disconnectable branches whose expected arc energy is less than the gas ignition energy threshold. The control ring main unit disconnects the non-critical power supply branches in the safe disconnectable branches to obtain the remaining safe disconnectable branches; Determine whether the residual load current value of the main feeder circuit of the remaining safe disconnectable branch has dropped below the preset safe current threshold. If not, the control ring main unit will disconnect the secondary non-critical power supply branches in the remaining safe disconnectable branches until the remaining load current value drops below the preset safe current threshold and the main power supply switch is disconnected.

2. The ring main unit control method based on a gas environment according to claim 1, wherein before the control ring main unit disconnects the non-critical power supply branch in the safe disconnectable branch, it includes: Obtain coal and petrological parameters and historical desorption response characteristics of the monitoring areas corresponding to each non-critical power branch. The coal and petrological parameters include coal porosity, gas adsorption saturation and original gas pressure. The historical desorption response characteristics include gas concentration surge and rise delay time. For each monitoring area, based on coal and petrological geological parameters and historical desorption response characteristics, the peak value of gas concentration increase corresponding to gas desorption is calculated; The predicted gas concentration value is obtained by superimposing the peak value of the sudden increase in gas concentration onto the gas concentration value. Determine whether the predicted gas concentration value exceeds the preset lower gas explosion limit threshold; If so, the load current values ​​of all non-critical power branches associated with the monitoring area shall be reduced to the minimum required level. Continuously monitor the gas concentration values ​​of the monitoring areas corresponding to each non-critical power branch, and calculate the rate of change of gas concentration; When the rate of change of gas concentration is lower than the preset stable threshold and the gas concentration value drops back to a safe level, repeat the above five steps.

3. The ring main unit control method based on a gas environment according to claim 2, wherein before the load current of all non-critical power branches associated with the monitoring area is reduced to the required minimum level, it includes: Obtain the ventilation status of the monitoring area corresponding to each non-critical power branch. The ventilation status includes local air volume, wind speed and the operating status of ventilation equipment. Determine whether the ventilation status meets the preset safe ventilation conditions; If not, calculate the minimum maintainable air volume that the monitored area can sustain; Compare the minimum sustainable air volume with the required air volume corresponding to the gas outburst intensity; If the minimum maintainable air volume is not less than the required air volume, then load reduction operations are permitted for non-critical power branches.

4. The ring main unit control method based on a gas environment according to claim 3, wherein before comparing the minimum sustainable air volume with the required air volume corresponding to the gas outburst intensity, the method includes: Acquire upstream intake airway, adjacent airway and shared return air section of the monitoring area to construct a local ventilation network topology map; Based on the local ventilation network topology, identify whether there are serial ventilation paths in the monitoring area; If not, the minimum maintainable air volume will be used as the baseline ventilation volume; If so, obtain the real-time air volume and gas concentration of the upstream intake airway in the series ventilation path, and combine the series ventilation path loss coefficient to attenuate and correct the minimum sustainable air volume, and generate the corrected minimum sustainable air volume. Based on the wind speed in the upstream intake airway and the length of the series ventilation path, the transmission delay of gas migration to the downstream monitoring area is calculated. The downstream gas outburst intensity is predicted based on the transmission delay, and the corrected air demand is generated.

5. The ring main unit control method based on a gas environment according to claim 1, wherein before calculating the expected arc energy of each power branch based on the branch current value, the method includes: Obtain the first gas concentration in the bottom area of ​​the ring main unit and the second gas concentration in the upper area of ​​the ring main unit; Calculate the concentration ratio of the first gas concentration to the second gas concentration; Determine whether the concentration ratio is greater than the preset local retention determination threshold; If so, it is determined that there is a risk of local gas deposition in the ring main unit, and the gradient of the difference between the first gas concentration and the second gas concentration is calculated; Calculate the gas accumulation intensity based on the differential gradient and cabinet height; If the gas accumulation intensity exceeds the preset eddy current intensity threshold, the maximum allowable breaking current limit of the ring main unit will be reduced according to the preset derating rules based on the gas accumulation intensity.

6. The ring main unit control method based on a gas environment according to claim 5, wherein before calculating the gas accumulation intensity based on the differential gradient and the unit height, the method includes: Obtain temperature data for at least two key heat-generating components inside the ring main unit. Key heat-generating components include bus joints, circuit breaker contacts, or cable terminals. Based on the temperature data and installation height of each key heating component, the contribution value of each key heating component to the vertical thermal buoyancy inside the ring main unit is calculated. The thermal buoyancy factor is obtained by weighted summation of the contribution values ​​of all key heat-generating components. Based on the thermal buoyancy factor, the preset thermal buoyancy-gas offset compensation mapping relationship is queried to obtain the concentration correction coefficient; Using the concentration correction coefficient, offset compensation is performed on the first gas concentration and the second gas concentration respectively to obtain the corrected first gas concentration and second gas concentration.

7. The ring main unit control method based on a gas environment according to claim 6, wherein calculating the contribution value of each key heating component to the vertical thermal buoyancy within the ring main unit based on the temperature data and installation height of each key heating component further includes: Obtain the attitude information of the ring main unit, including the tilt angle and tilt direction of the ring main unit relative to the direction of gravity. Based on the tilt angle and tilt direction, the installation height of each key heating component is converted into the effective vertical height of each key heating component in the direction of gravity; Based on the tilt orientation, determine the spatial projection of the dominant direction of vertical thermal buoyancy inside the cabinet, and use the spatial projection as the dominant direction vector of vertical thermal buoyancy. Based on the effective vertical height and dominant direction vector, the contribution of each key heat-generating component to the vertical thermal buoyancy within the ring main unit is recalculated.

8. A ring main unit control system based on a gas environment, characterized in that, The system is used to execute the ring main unit control method based on a gas environment as described in any one of claims 1 to 7, including: The acquisition module is used to acquire concentration values, total load current values ​​of the main power supply circuit, and branch current distribution of each power-consuming branch. A memory for storing the program of the ring main unit control method based on the gas environment; The processor and the program in the memory can be loaded and executed by the processor to implement the ring main unit control method based on the gas environment.

9. A smart terminal, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer program is stored that can be loaded by a processor and execute the method as described in any one of claims 1 to 7.

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