Anti-interference weak current cable for airport

Abstract

The invention relates to the field of weak current cables, in particular to an anti-interference weak current cable for an airport, which comprises a cable main body used for transmitting various data information; the data acquisition module is used for acquiring a temperature reference value, a smoke particle concentration value and a longitudinal ventilation rate; the period monitoring module is used for determining whether to adjust the duration of the data acquisition period according to whether the suspected abnormal point location exists in the target monitoring area, and setting a period adjustment set according to the temperature difference value; the positioning analysis module is used for determining whether to perform positioning analysis on each abnormal point location according to the number and the distribution state of the abnormal point locations in the target monitoring area, and determining a positioning strategy according to the proportion of the smoke discharge point locations; the information transmission module is used for transmitting cable information to a user, and the requirement for the coverage degree of monitoring equipment is lowered under the condition that the accuracy of a fire source positioning result is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of cable safety, and in particular to an anti-interference weak-current cable for airports. Background Art

[0002] To ensure the stability and safety of the power system in airports, airports usually use special cable tunnels to lay cables. However, if a fire occurs in the cable tunnel, how to locate the fire source in time is of great significance for protecting the cables. However, based on the current positioning methods, in order to ensure the accuracy of fire source positioning, a large number of monitoring devices need to be installed in the cable tunnel, resulting in a waste of equipment resources and data processing resources. Therefore, how to ensure the accuracy of fire source positioning results in cable tunnels while saving equipment resources and data processing resources as much as possible is a problem that technical personnel in this field urgently need to solve.

[0003] Chinese patent publication number CN211699808U discloses a temperature-sensitive fire detection cable, which includes two conductors, an insulating layer outside the conductors, an insulating tape connected between the insulating layers, and an outer sheath outside the insulating layer and the insulating tape; a plurality of detection modules are arranged at intervals on the insulating tape, and the detection modules are electrically connected to the conductors; the detection modules include a temperature sensing element and a temperature control chip, the temperature sensing element measures the temperature and transmits the measured temperature data to the temperature control chip, the temperature control chip processes the received temperature data and transmits it through a connection point and a conductor; the detection modules are connected in series through a fuse, the temperature control chip monitors the current flowing through the fuse through the detection module in real time, obtains the conduction and disconnection signals of the fuse current, the temperature control chip processes the received conduction and disconnection signals and transmits them through a connection point and a conductor, but the above-mentioned temperature-sensitive fire detection cable has the following problems: it fails to select a targeted positioning analysis method according to the distribution of abnormal points of the cable in actual scenarios, resulting in poor temperature sensing and positioning capabilities of the cable. Summary of the Invention

[0004] To this end, the present invention provides an anti-interference low-current cable for airports to overcome the problem in the prior art that a targeted positioning analysis method is not selected according to the distribution of abnormal points of the cable in actual scenarios, resulting in poor temperature sensing and positioning capabilities of the cable.

[0005] To achieve the above object, the present invention provides an anti-interference weak current cable for airport use, comprising: The cable body is used to transmit various types of data information; a data acquisition module connected to the cable body, for collecting temperature reference values ​​and smoke particle concentration values ​​of each monitoring point in the target monitoring area and longitudinal ventilation rates of each wind speed monitoring point, and determining the category of each monitoring point; A periodic monitoring module, connected to the data acquisition module, is used to determine whether to adjust the duration of the data acquisition cycle based on whether there are suspected abnormal points in the target monitoring area, and to set a periodic adjustment set corresponding to the suspected abnormal points based on the temperature difference value of each suspected abnormal point; A positioning analysis module, which is connected to the data acquisition module, is used to determine whether to perform positioning analysis on each abnormal point according to the number and distribution of abnormal points in the target monitoring area, and to determine the positioning strategy of the target monitoring area according to the proportion of smoke exhaust points; The information transmission module is connected to the positioning analysis module and is used to transmit cable information to the user.

[0006] Furthermore, the cable body includes: Inner conductor, used to transmit electric current or electromagnetic wave information; The cable sheath is coated on the inner conductor, and the cable sheath is a multi-layer structure, including an insulating layer, a shielding layer and a protective layer arranged layer by layer from the inside to the outside; An insulating layer, used for covering the inner conductor; A shielding layer, used to isolate the electromagnetic field inside the shielding layer from the electromagnetic field outside the shielding layer; The protective layer is used to protect the inner conductor, the insulating layer and the shielding layer.

[0007] Furthermore, the data acquisition module includes: A temperature monitoring unit comprising a plurality of temperature sensors for collecting temperature reference values ​​at each monitoring point; A smoke monitoring unit, which includes a number of smoke sensors for collecting smoke particle concentration values ​​at each monitoring point; The wind speed monitoring unit includes a plurality of wind speed detectors for collecting the longitudinal ventilation rate at each wind speed monitoring point.

[0008] Furthermore, the data acquisition module is provided with a monitoring cycle, and the data acquisition module periodically collects temperature reference values ​​and smoke particle concentration values ​​of each monitoring point in the target monitoring area, and records the category of the monitoring point whose corresponding temperature reference value or smoke particle concentration value is within the corresponding abnormal data range as an abnormal point; An abnormal data range is set corresponding to each of the temperature reference value and the smoke particle concentration value.

[0009] Furthermore, the periodic monitoring module includes a first monitoring unit and a second monitoring unit; The first monitoring unit is used to reduce the duration of the data collection cycle of each suspected abnormal point and each monitoring point in the period adjustment set; The second monitoring unit is used to set a preset adjustment distance of the periodic adjustment set corresponding to each suspected abnormal point according to the temperature difference value of each suspected abnormal point; The suspected abnormal point is a monitoring point whose temperature difference value is greater than a preset temperature difference value.

[0010] Furthermore, the positioning analysis module includes a first analysis unit, a second analysis unit, a first positioning unit, and a second positioning unit; The first analysis unit is used to determine whether to perform positioning analysis on each abnormal point according to the number and distribution status of the abnormal points in the target monitoring area; The distribution state is determined according to the interval distance between each abnormal point, and the distribution state includes a discrete state and a dense state.

[0011] Furthermore, the second analysis unit is used to determine the source coefficient of each abnormal point according to the abnormal duration or abnormal data change rate of each abnormal point according to the proportion of the smoke exhaust points under the abnormal point condition, or to determine the key area according to the abnormal difference coefficient of each abnormal point; The smoke exhaust point ratio is the ratio of the number of smoke exhaust points to the number of wind speed monitoring points, and the smoke exhaust points are wind speed monitoring points where the longitudinal ventilation rate is greater than the preset longitudinal ventilation rate; The point abnormality condition is that the number of abnormal points is greater than a preset number of abnormal points, or there are abnormal points in a dense state.

[0012] Furthermore, the first positioning unit is used to detect the abnormal influence coefficient of each abnormal point under the first smoke exhaust condition, detect the abnormal duration of each abnormal point within the key influence point and a preset range thereof, and determine the source coefficient of each abnormal point according to the abnormal duration of each abnormal point; The source coefficient of each abnormal point is positively correlated with the abnormal duration of the corresponding abnormal point; The first smoke exhaust condition is that the proportion of smoke exhaust points is greater than the proportion of preset smoke exhaust points.

[0013] Furthermore, the first positioning unit is further configured to detect the abnormal data change rate of the non-critical impact point during the continuous smoke exhaust phase, and determine the source coefficient of the corresponding non-critical impact point according to the abnormal data change rate of each abnormal point; The source coefficient of each non-critical influencing point is negatively correlated with the corresponding abnormal data change rate.

[0014] Furthermore, the second positioning unit is used to divide the area where the abnormal points exist under the second smoke exhaust condition to obtain a plurality of abnormal sub-areas, and detect the abnormal difference coefficient of each abnormal point in each abnormal sub-area, and determine the key area according to the abnormal difference coefficient of each abnormal point; The abnormal difference coefficient is determined based on the temperature reference value and the smoke particle concentration value of each abnormal point; The second smoke exhaust condition is that the proportion of smoke exhaust points is less than or equal to the preset proportion of smoke exhaust points.

[0015] Compared with the prior art, the beneficial effect of the present invention lies in that the technical solution of the present invention selects a targeted positioning analysis method according to the actual distribution of abnormal points in the target monitoring area and the actual ventilation conditions, so that the accuracy of the fire source positioning results obtained is higher, so as to achieve effective protection of the weak current cables in the cable tunnel. While ensuring the accuracy of the fire source positioning results, the requirements for the coverage of the monitoring equipment are reduced.

[0016] Furthermore, the present invention determines whether to adjust the duration of the data collection cycle based on whether there are suspected abnormal points. If there are suspected abnormal points, the duration of the data collection cycle of each suspected abnormal point and each monitoring point in its period adjustment set is reduced and adjusted, thereby ensuring the timeliness of the positioning analysis of the abnormal points and the reliability of the fire source positioning results obtained.

[0017] Furthermore, in the present invention, if the number of abnormal points is greater than the preset number of abnormal points or the abnormal points are densely packed, a positioning analysis is performed on each abnormal point to obtain the source coefficient and key area of ​​each abnormal point, and a corresponding positioning strategy is determined based on the proportion of smoke exhaust points. If the proportion of smoke exhaust points is less than or equal to the preset proportion of smoke exhaust points, the key area is determined based on the difference between the changing pattern of the smoke particle concentration value near the fire point in the cable tunnel and the changing pattern of the temperature reference value, thereby further improving the accuracy of the fire source positioning result obtained.

[0018] Furthermore, in the present invention, if the proportion of smoke exhaust points is greater than the preset proportion of smoke exhaust points, the judgment parameters for determining the source coefficient are selected according to whether they are key influence points. For key influence points, the source coefficient of each abnormal point is determined according to the duration of the abnormality of each abnormal point. For abnormal points other than key influence points, the source coefficient of each abnormal point is determined according to the change rate of the abnormal data of each abnormal point, so that the method of determining the source coefficient is more in line with the actual scenario. The present invention improves the accuracy of fire source locating. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a module connection diagram of the anti-interference airport weak current cable of the present invention; Figure 2 Schematic diagram of the structure of the cable body of the present invention; Figure 3 Module structure diagram of the data acquisition module of the present invention; Figure 4This is a module structure diagram of the positioning analysis module of the present invention; Figure 5 Module structure diagram of the period detection module of the present invention; In the figure: inner conductor 1, insulation layer 2, shielding layer 3, protective layer 4. DETAILED DESCRIPTION

[0020] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0021] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] See also Figure 1 As shown in FIG, it is a module connection diagram of the anti-interference weak-current cable for airports of the present invention. The present invention provides an anti-interference weak-current cable for airports, comprising: The cable body is used to transmit various types of data information; a data acquisition module connected to the cable body, for collecting temperature reference values ​​and smoke particle concentration values ​​of each monitoring point in the target monitoring area and longitudinal ventilation rates of each wind speed monitoring point, and determining the category of each monitoring point; A periodic monitoring module, connected to the data acquisition module, is used to determine whether to adjust the duration of the data acquisition cycle based on whether there are suspected abnormal points in the target monitoring area, and to set a periodic adjustment set corresponding to the suspected abnormal points based on the temperature difference value of each suspected abnormal point; A positioning analysis module, which is connected to the data acquisition module, is used to determine whether to perform positioning analysis on each abnormal point according to the number and distribution of abnormal points in the target monitoring area, and to determine the positioning strategy of the target monitoring area according to the proportion of smoke exhaust points; The information transmission module is connected to the positioning analysis module and is used to transmit cable information to the user.

[0025] The target monitoring area in the present invention is a collection of cable tunnels where the weak-current cables in the airport are located, and the abnormality source obtained in the present invention is the fire point in the cable tunnel.

[0026] See also Figure 2 As shown, it is a structural schematic diagram of the cable body, which includes an inner conductor 1, an insulating layer 2, a shielding layer 3 and a protective layer 4.

[0027] Specifically, the cable body includes: Inner conductor, used to transmit electric current or electromagnetic wave information; The cable sheath is coated on the inner conductor, and the cable sheath is a multi-layer structure, including an insulating layer, a shielding layer and a protective layer arranged layer by layer from the inside to the outside; An insulating layer, used for covering the inner conductor; A shielding layer, used to isolate the electromagnetic field inside the shielding layer from the electromagnetic field outside the shielding layer; The protective layer is used to protect the inner conductor, the insulating layer and the shielding layer.

[0028] Among them, the various types of data transmitted by the cable body include but are not limited to video data and voice data. In the present invention, the inner conductor can be made of copper or aluminum, the insulation layer can be made of polyvinyl chloride (PVC), the shielding layer can be copper wire braid or aluminum foil, and the protective layer can be PVC or rubber. Users can make adaptive settings according to actual conditions.

[0029] See also Figures 3 to 5 , which are the module structure block diagrams of the data acquisition module, the module structure block diagram of the period detection module, and the module structure block diagram of the positioning analysis module.

[0030] Specifically, the data acquisition module includes: A temperature monitoring unit comprising a plurality of temperature sensors for collecting temperature reference values ​​at each monitoring point; A smoke monitoring unit, which includes a number of smoke sensors for collecting smoke particle concentration values ​​at each monitoring point; The wind speed monitoring unit includes a plurality of wind speed detectors for collecting the longitudinal ventilation rate at each wind speed monitoring point.

[0031] The present invention does not specify the specific models of temperature sensors, smoke sensors, and wind speed detectors used. Users can make adaptive choices based on the actual working scenario. The selected temperature sensors, smoke sensors, and wind speed detectors must ensure that they can detect the temperature, smoke concentration, and longitudinal wind speed at their respective locations. The monitoring points in the present invention are positions for monitoring temperature reference values ​​and smoke particle concentration values, and the wind speed monitoring points are positions for monitoring longitudinal ventilation rate. The present invention does not make specific limitations on the setting positions of the monitoring points and wind speed monitoring points. A method for setting monitoring points is provided, and a monitoring point is set every 50m. A method for setting wind speed monitoring points is provided, and a wind speed monitoring point is set every 100m. A temperature sensor and a smoke sensor are set at the location of each monitoring point on the cable body, and a wind speed detector is set at the location of each wind speed monitoring point on the cable body. In the invention, each temperature sensor and each smoke sensor is set at a monitoring point, and each wind speed detector is set at a wind speed monitoring point. The temperature sensor, smoke sensor and wind speed detector are all connected to the cable. The specific connection relationship can be connected to the cable surface by a cable tie or clamped on the cable surface by a ring clamp. The periodic monitoring module, positioning analysis module and information transmission module are packaged as a whole, which is set on the cable, and its specific position is not limited. In addition, the periodic monitoring module, positioning analysis module and information transmission module are all electrically connected to the temperature sensor, smoke sensor and wind speed detector in the data acquisition module.

[0032] Specifically, the data acquisition module is provided with a monitoring cycle, and the data acquisition module periodically collects the temperature reference value and the smoke particle concentration value of each monitoring point in the target monitoring area, and records the category of the monitoring point whose corresponding temperature reference value or smoke particle concentration value is within the corresponding abnormal data range as an abnormal point; An abnormal data range is set corresponding to each of the temperature reference value and the smoke particle concentration value.

[0033] The present invention has a cyclic data collection cycle, the duration of which can be determined by the user. The higher the user's safety requirements for weak-current cables, the shorter the data collection cycle. A data collection cycle is provided, which is 5 minutes. At the end of each data collection cycle, the temperature reference value and smoke particle concentration value of each monitoring point are collected; The temperature reference value is the temperature value collected by the temperature sensor of each monitoring point, and the smoke particle concentration value is the content of smoke particles in the air per unit volume collected by the smoke sensor of each monitoring point. The user can set the abnormal data range corresponding to the temperature reference value and the smoke particle concentration value according to actual needs. If the temperature reference value of a monitoring point is greater than the preset temperature reference value, it is determined that the temperature reference value of the monitoring point is within the abnormal data range. If the smoke particle concentration value of a monitoring point is greater than the preset smoke particle concentration value, it is determined that the smoke particle concentration value of the monitoring point is within the abnormal data range. A preset temperature reference value is provided, and the preset temperature reference value is 60°C. A preset smoke particle concentration value is provided, and the preset smoke particle concentration value is 0.5 mg / m³. The categories of the monitoring points include abnormal points and normal points. A normal point is a monitoring point whose temperature reference value and smoke particle concentration value are not within the corresponding abnormal data range.

[0034] Specifically, the periodic monitoring module includes a first monitoring unit and a second monitoring unit; The first monitoring unit is used to reduce the duration of the data collection cycle of each suspected abnormal point and each monitoring point in the period adjustment set; The second monitoring unit is used to set a preset adjustment distance of the periodic adjustment set corresponding to each suspected abnormal point according to the temperature difference value of each suspected abnormal point; The suspected abnormal point is a monitoring point whose temperature difference value is greater than a preset temperature difference value.

[0035] Among them, only when there are suspected abnormal points in the target monitoring area, the first monitoring unit adjusts the duration of the data collection cycle of each suspected abnormal point and each monitoring point in its periodic adjustment set, and the second monitoring unit sets the preset adjustment distance of the periodic adjustment set corresponding to the suspected abnormal point according to the temperature difference value of each suspected abnormal point. The temperature difference value is the absolute value of the difference between the temperature reference value detected in the current data collection cycle and the previous data collection cycle. The user can set the value of the preset temperature difference value according to actual needs and historical records. The higher the user's safety requirements for the weak-current cable, the smaller the value of the preset temperature difference value. A method for determining the preset temperature difference value is provided, and the minimum value of the temperature difference value of each suspected abnormal point in the historical records that meets the user's safety requirements for the weak-current cable is recorded as the preset temperature difference value; For a single suspected abnormal point, all monitoring points that undergo data collection cycle adjustment due to the suspected abnormal point are recorded as the periodic adjustment set of the suspected abnormal point. The tunnel distance between each monitoring point and the corresponding suspected abnormal point in each periodic adjustment set is less than or equal to the preset adjustment distance. It is worth noting that the tunnel distance between the two monitoring points is the distance traveled from one monitoring point to the other monitoring point only along the inside of the cable tunnel. The preset adjustment distance is positively correlated with the temperature difference value of the corresponding suspected abnormal point.

[0036] Specifically, the positioning analysis module includes a first analysis unit, a second analysis unit, a first positioning unit, and a second positioning unit; The first analysis unit is used to determine whether to perform positioning analysis on each abnormal point according to the number and distribution status of the abnormal points in the target monitoring area; The distribution state is determined according to the interval distance between each abnormal point, and the distribution state includes a discrete state and a dense state.

[0037] Among them, if there are several abnormal points, and the tunnel distance between any abnormal point and its adjacent abnormal point is less than or equal to the preset distribution distance, then it is determined that these abnormal points are in a dense state. If there are several abnormal points, and the tunnel distance between any abnormal point and its adjacent abnormal point is greater than the preset distribution distance, then it is determined that these abnormal points are in a discrete state. For any abnormal point, the adjacent abnormal point corresponding to the abnormal point is the abnormal point with the smallest tunnel distance from the abnormal point in each tunnel extension direction. The tunnel extension direction is a straight line direction starting from one side of a monitoring point, along the axis of the tunnel, until it reaches the opposite side of the monitoring point. An example is provided. There is an abnormal point A, abnormal There are three different tunnel extension directions for the normal point A, and the three tunnel extension directions are respectively recorded as B1 direction, B2 direction and B3 direction, and the abnormal points closest to the abnormal point A in the B1 direction, B2 direction and B3 direction are respectively recorded as adjacent abnormal points of the abnormal point A. The value of the preset distribution distance can be set by the user according to actual needs and historical records. The higher the user's reliability requirements for the fire source positioning result, the smaller the value of the preset distribution distance. A method for determining the value of the preset distribution distance is provided, and the historical records that have not been subjected to positioning analysis are recorded as reference records. The average value of the tunnel distances between adjacent abnormal points in the reference records that meet the user's requirements for the reliability of the fire source positioning result is recorded as the preset distribution distance; The value of the preset number of abnormal points can be set by the user according to actual needs and historical records. The higher the user's requirements for the reliability of the fire source location result, the larger the value of the preset number of abnormal points. A method for determining the value of the preset number of abnormal points is provided, and the average value of the number of abnormal points in each reference record that meets the user's requirements for the reliability of the fire source location result is recorded as the preset number of abnormal points; If the number of abnormal points is less than or equal to the preset number of abnormal points and each abnormal point is in a discrete state, no positioning analysis will be performed on each abnormal point. Each abnormal point will be recorded as an abnormal source point and an early warning message will be sent to the user.

[0038] Specifically, the second analysis unit is used to determine the source coefficient of each abnormal point according to the abnormal duration or abnormal data change rate of each abnormal point based on the proportion of smoke exhaust points under the abnormal point condition, or to determine the key area according to the abnormal difference coefficient of each abnormal point; The smoke exhaust point ratio is the ratio of the number of smoke exhaust points to the number of wind speed monitoring points, and the smoke exhaust points are wind speed monitoring points where the longitudinal ventilation rate is greater than the preset longitudinal ventilation rate; The point abnormality condition is that the number of abnormal points is greater than a preset number of abnormal points, or there are abnormal points in a dense state.

[0039] The present invention has a cyclic wind speed monitoring period, the duration of which can be determined by the user. The higher the reliability requirement of the fire source location result, the shorter the duration of the wind speed monitoring period. A wind speed monitoring period is provided, which is 30 minutes. At the end of each wind speed monitoring period, the longitudinal ventilation rate of each wind speed monitoring point is collected; The categories of wind speed monitoring points include smoke exhaust points and non-smoke exhaust points. The non-smoke exhaust points are wind speed monitoring points whose longitudinal ventilation rate is less than or equal to the preset longitudinal ventilation rate. The longitudinal ventilation rate is the air flow speed along the length of the cable tunnel, so as to avoid the air flow speed in the tunnel and the smoke exhaust process from affecting the fire source positioning results. Further selection is made for the positioning method based on the longitudinal ventilation rate of each wind speed monitoring point in the target monitoring area, which can effectively ensure the reliability of the fire source positioning results obtained. The user can set the value of the preset longitudinal ventilation rate according to actual needs and historical records. The higher the user's reliability requirements for the fire source positioning results, the smaller the value of the preset longitudinal ventilation rate. A method for determining the value of the preset longitudinal ventilation rate is provided. The historical records of the key areas determined according to the abnormal difference coefficient of each abnormal point are recorded as wind speed reference records. The average value of the longitudinal ventilation rate measured at each wind speed detection point in the wind speed reference record that meets the user's reliability requirements for the fire source positioning results is recorded as the preset longitudinal ventilation rate.

[0040] Specifically, the first positioning unit is used to detect the abnormal influence coefficient of each abnormal point under the first smoke exhaust condition, and detect the abnormal duration of each abnormal point within the key impact point and its preset range, and determine the source coefficient of each abnormal point according to the abnormal duration of each abnormal point; The source coefficient of each abnormal point is positively correlated with the abnormal duration of the corresponding abnormal point; The first smoke exhaust condition is that the proportion of smoke exhaust points is greater than the proportion of preset smoke exhaust points.

[0041] Among them, the user can set the preset smoke exhaust point ratio according to actual needs and historical records. The higher the user's reliability requirements for the fire source location result, the smaller the value of the preset smoke exhaust point ratio. A method for determining the preset smoke exhaust point ratio is provided. The maximum value of the smoke exhaust point ratio in the wind speed reference record that meets the user's reliability requirements for the fire source location result is recorded as the preset smoke exhaust point ratio. A value for the preset smoke exhaust point ratio is provided, and the value of the preset smoke exhaust point ratio is 0.4; For a single abnormal point, the abnormal influence coefficient is the number of monitoring points within the preset range of the abnormal point. The tunnel distance between each monitoring point and the corresponding abnormal point within the preset range of each abnormal point is less than or equal to the preset distance. The value of the preset distance can be set by the user according to actual needs and historical records. The higher the user's reliability requirement for the fire source positioning result, the larger the value of the preset distance. A value of the preset distance is provided, and the value of the preset distance is 100m; the categories of the abnormal points include key influence points and non-key influence points. The key influence point is an abnormal point with an abnormal influence coefficient greater than the preset abnormal coefficient, and the non-key influence point is an abnormal point with an abnormal influence coefficient less than or equal to the preset abnormal coefficient. The value of the preset abnormal coefficient can be set by the user according to actual needs and historical records. The higher the user's reliability requirement for the fire source positioning result, the smaller the value of the preset abnormal coefficient. A method for determining the preset abnormal coefficient is provided, and the average value of the abnormal influence coefficient of each abnormal point in the historical record that meets the user's reliability requirement for the fire source positioning result is recorded as the preset abnormal coefficient.

[0042] Specifically, the first positioning unit is further used to detect the abnormal data change rate of the non-critical impact point during the continuous smoke exhaust phase, and determine the source coefficient of the corresponding non-critical impact point according to the abnormal data change rate of each abnormal point; The source coefficient of each non-critical influencing point is negatively correlated with the corresponding abnormal data change rate.

[0043] Among them, the starting time of the smoke exhaust duration phase is the starting time of the wind speed monitoring period when the proportion of smoke exhaust points in the target monitoring area is first monitored to be greater than the preset smoke exhaust point proportion. The ending time of the smoke exhaust duration phase is the current time. The abnormal data change rate is the sum of the products of the temperature change rate and the influence coefficients corresponding to the smoke concentration change rate. The temperature change rate is the average value of the absolute value of the difference between the temperature reference value collected in each data collection period during the smoke exhaust duration phase and the temperature reference value collected in the previous data collection period. The smoke concentration change rate is the average value of the absolute value of the difference between the smoke particle concentration value collected in each data collection period during the smoke exhaust duration phase and the smoke particle concentration value collected in the previous data collection period. The user can set the corresponding influence coefficient values ​​for the temperature change rate and the smoke concentration change rate according to actual needs. A value of the influence coefficient corresponding to the temperature change rate is provided, and the value of the influence coefficient corresponding to the temperature change rate is 0.4. A value of the influence coefficient corresponding to the smoke concentration change rate is provided, and the value of the influence coefficient corresponding to the smoke concentration change rate is 0.6. If the cable tunnel is in the smoke exhaust stage, there are monitoring points with abnormal data in the area only due to the smoke concentration or temperature change at the fire point. The air flow during the smoke exhaust process will cause large changes in the temperature reference value and the smoke particle concentration value. Compared with such monitoring points, the abnormal data change rate of the abnormal source and its surrounding areas is smaller. Therefore, the source coefficient of each abnormal point is determined according to the abnormal data change rate of each abnormal point, and the source coefficient is negatively correlated with the value of the abnormal data change rate.

[0044] The early warning module sends early warning information to users based on the source coefficient of each abnormal point. The larger the source coefficient of the abnormal point, the greater the possibility that it is the source of the abnormality.

[0045] Specifically, the second positioning unit is used to divide the area where the abnormal points exist under the second smoke exhaust condition to obtain a plurality of abnormal sub-areas, and detect the abnormal difference coefficient of each abnormal point in each abnormal sub-area, and determine the key area according to the abnormal difference coefficient of each abnormal point; The abnormal difference coefficient is determined based on the temperature reference value and the smoke particle concentration value of each abnormal point; The second smoke exhaust condition is that the proportion of smoke exhaust points is less than or equal to the preset proportion of smoke exhaust points.

[0046] Among them, all abnormal points in a single abnormal sub-area are located in the cable tunnel in the same tunnel extension direction. For a single abnormal point, the abnormal difference coefficient is the absolute value of the difference between the temperature difference and the smoke concentration difference, the temperature difference is the ratio of the temperature reference difference value to the average temperature reference value, the temperature reference difference value is the absolute value of the difference between the temperature reference value and the average temperature reference value, the average temperature reference value is the average value of the temperature reference values ​​of each abnormal point in the abnormal sub-area, the smoke concentration difference value is the ratio of the smoke concentration difference value to the average smoke concentration reference value, the smoke concentration difference value is the absolute value of the difference between the smoke particle concentration value and the average smoke concentration reference value, and the average smoke concentration reference value is the average value of the smoke particle concentration values ​​of each abnormal point in the abnormal sub-area; Abnormal points with an abnormal difference coefficient greater than the preset abnormal difference coefficient are recorded as key points. For a single abnormal sub-area, the key area is the area between two key points closest to the midpoint of the abnormal sub-area in different tunnel extension directions. Based on the difference between the changing pattern of the smoke particle concentration value near the fire point in the cable tunnel and the changing pattern of the temperature reference value, the location of the abnormal source is further determined. The early warning module will send the obtained key area as early warning information to the user.

[0047] Thus far, the technical solutions of the present invention have 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 scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0048] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An anti-interference weak current cable for airports, characterized in that: include: The main body of the cable is used to transmit various types of data information; A data acquisition module, which is connected to the cable body and is used to collect temperature reference values ​​and smoke particle concentration values ​​of each monitoring point in the target monitoring area and the longitudinal ventilation rate of each wind speed monitoring point, and determine the category of each monitoring point; A periodic monitoring module, which is connected to the data acquisition module, is used to determine whether to adjust the duration of the data acquisition cycle according to whether there are suspected abnormal points in the target monitoring area, and to set a periodic adjustment set corresponding to the suspected abnormal points according to the temperature difference value of each suspected abnormal point; A positioning analysis module, which is connected to the data acquisition module, is used to determine whether to perform positioning analysis on each abnormal point according to the number and distribution status of abnormal points in the target monitoring area, and to determine the positioning strategy of the target monitoring area according to the proportion of smoke exhaust points; The information transmission module is connected to the positioning analysis module and is used to transmit cable information to the user.

2. The anti-interference airport weak current cable according to claim 1 is characterized in that: The cable body comprises: Inner conductor, used to transmit electric current or electromagnetic wave information; A cable sheath, which is coated on the inner conductor, and the cable sheath is a multi-layer structure, including an insulating layer, a shielding layer and a protective layer arranged layer by layer from the inside to the outside; An insulating layer, used for covering the inner conductor; A shielding layer is used to isolate the electromagnetic field inside the shielding layer from the electromagnetic field outside the shielding layer; The protective layer is used to protect the inner conductor, the insulating layer and the shielding layer.

3. The anti-interference airport weak current cable according to claim 1 is characterized in that: The data acquisition module comprises: A temperature monitoring unit, which includes a plurality of temperature sensors for collecting temperature reference values ​​of each monitoring point; A smoke monitoring unit, which includes a number of smoke sensors for collecting smoke particle concentration values ​​at each monitoring point; The wind speed monitoring unit comprises a plurality of wind speed detectors for collecting the longitudinal ventilation rate at each wind speed monitoring point.

4. The anti-interference airport weak current cable according to claim 3 is characterized in that: The data acquisition module is provided with a monitoring cycle, and the data acquisition module periodically collects temperature reference values ​​and smoke particle concentration values ​​of each monitoring point in the target monitoring area, and records the category of the monitoring point whose corresponding temperature reference value or smoke particle concentration value is in the corresponding abnormal data range as an abnormal point; An abnormal data range is respectively set corresponding to the temperature reference value and the smoke particle concentration value.

5. The anti-interference airport weak current cable according to claim 4 is characterized in that: The periodic monitoring module includes a first monitoring unit and a second monitoring unit; The first monitoring unit is used to reduce and adjust the duration of the data collection cycle of each suspected abnormal point and each monitoring point in the period adjustment set; The second monitoring unit is used to set a preset adjustment distance of the periodic adjustment set corresponding to the suspected abnormal point according to the temperature difference value of each suspected abnormal point; The suspected abnormal point is a monitoring point whose temperature difference value is greater than a preset temperature difference value.

6. The anti-interference airport weak current cable according to claim 5, characterized in that: The positioning analysis module includes a first analysis unit, a second analysis unit, a first positioning unit and a second positioning unit; The first analysis unit is used to determine whether to perform positioning analysis on each abnormal point according to the number and distribution status of the abnormal points in the target monitoring area; The distribution state is determined according to the interval distance between each abnormal point, and the distribution state includes a discrete state and a dense state.

7. The anti-interference airport weak current cable according to claim 6, characterized in that: The second analysis unit is used to determine the source coefficient of each abnormal point according to the abnormal duration of each abnormal point or the abnormal data change rate according to the proportion of the smoke exhaust point under the point abnormality condition, or determine the key area according to the abnormal difference coefficient of each abnormal point; The smoke exhaust point ratio is the ratio of the number of smoke exhaust points to the number of wind speed monitoring points, and the smoke exhaust point is a wind speed monitoring point whose longitudinal ventilation rate is greater than a preset longitudinal ventilation rate; The point abnormality condition is that the number of abnormal points is greater than a preset number of abnormal points, or there are abnormal points in a dense state.

8. The anti-interference airport weak current cable according to claim 7, characterized in that: The first positioning unit is used to detect the abnormal influence coefficient of each abnormal point under the first smoke exhaust condition, detect the abnormal duration of each abnormal point within the key influence point and its preset range, and determine the source coefficient of each abnormal point according to the abnormal duration of each abnormal point; The source coefficient of each abnormal point is positively correlated with the abnormal duration of the corresponding abnormal point; The first smoke exhaust condition is that the proportion of smoke exhaust points is greater than the proportion of preset smoke exhaust points.

9. The anti-interference airport weak current cable according to claim 8, characterized in that: The first positioning unit is also used to detect the abnormal data change rate of the non-critical impact point during the continuous smoke exhaust phase, and determine the source coefficient of the corresponding non-critical impact point according to the abnormal data change rate of each abnormal point; The source coefficient of each non-critical influencing point is negatively correlated with the corresponding abnormal data change rate.

10. The anti-interference airport weak current cable according to claim 9, characterized in that: The second positioning unit is used to divide the area with abnormal points under the second smoke exhaust condition to obtain a number of abnormal sub-areas, and detect the abnormal difference coefficient of each abnormal point in each abnormal sub-area, and determine the key area according to the abnormal difference coefficient of each abnormal point; The abnormal difference coefficient is determined according to the temperature reference value and the smoke particle concentration value of each abnormal point; The second smoke exhaust condition is that the proportion of smoke exhaust points is less than or equal to the preset proportion of smoke exhaust points.

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