A kind of weak current cable for anti-interference airport

Abstract

The present invention relates to the field of weak-current cables, and in particular to an anti-interference weak-current cable for airports, comprising: a cable body for transmitting various types of data information; a data acquisition module for acquiring temperature reference values, smoke particle concentration values ​​and longitudinal ventilation rates; a periodic monitoring module for determining whether to adjust the duration of a data acquisition period according to whether there are suspected abnormal points in a target monitoring area, and setting a periodic adjustment set according to a temperature difference value; a positioning analysis module for determining 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, and determining a positioning strategy according to the proportion of smoke exhaust points; and an information transmission module for transmitting cable information to a user. The present invention reduces the requirements for the coverage of monitoring equipment while ensuring the accuracy of fire source positioning results.

Description

Technical Field

[0001] The 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 the airport, the airport usually uses a special cable tunnel to lay cables. However, if a fire occurs in the cable tunnel, how to locate the fire source in time is of great significance to the protection of the cables. However, based on the current existing 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 the fire source positioning results in the cable tunnel while saving equipment resources and data processing resources as much as possible is a problem that needs to be urgently solved by technical personnel in this field.

[0003] Chinese patent publication number CN211699808U discloses a temperature-sensitive fire detection cable, comprising two conductors, an insulating layer outside the conductor, 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 module comprises 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 on / off signal of the fuse current, the temperature control chip processes the received on / off signal and transmits it through a connection point and a conductor, but the above-mentioned temperature-sensitive fire detection cable has the following problems: a targeted positioning analysis method is not selected according to the distribution of abnormal points of the cable in an actual scenario, resulting in poor temperature sensing and positioning capability of the cable. Summary of the invention

[0004] To this end, the present invention provides an anti-interference low-current cable for airports, which is used to overcome the problem that the prior art fails to select a targeted positioning analysis method according to the distribution of abnormal points of the cable in the actual scene, resulting in poor temperature sensing and positioning ability of the cable.

[0005] To achieve the above object, the present invention provides an anti-interference weak current cable for airports, comprising:

[0006] The main body of the cable is used to transmit various types of data information;

[0007] 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;

[0008] 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;

[0009] 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;

[0010] The information transmission module is connected to the positioning analysis module and is used to transmit cable information to the user.

[0011] Furthermore, the cable body comprises:

[0012] Inner conductor, used to transmit electric current or electromagnetic wave information;

[0013] 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;

[0014] An insulating layer, used for covering the inner conductor;

[0015] A shielding layer is used to isolate the electromagnetic field inside the shielding layer from the electromagnetic field outside the shielding layer;

[0016] The protective layer is used to protect the inner conductor, the insulating layer and the shielding layer.

[0017] Furthermore, the data acquisition module includes:

[0018] A temperature monitoring unit, which includes a plurality of temperature sensors for collecting temperature reference values ​​of each monitoring point;

[0019] A smoke monitoring unit, which includes a number of smoke sensors for collecting smoke particle concentration values ​​at each monitoring point;

[0020] The wind speed monitoring unit comprises a plurality of wind speed detectors for collecting the longitudinal ventilation rate at each wind speed monitoring point.

[0021] 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 in the corresponding abnormal data range as an abnormal point;

[0022] An abnormal data range is respectively set corresponding to the temperature reference value and the smoke particle concentration value.

[0023] Further, the periodic monitoring module includes a first monitoring unit and a second monitoring unit;

[0024] 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;

[0025] 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;

[0026] The suspected abnormal point is a monitoring point whose temperature difference value is greater than a preset temperature difference value.

[0027] Further, the positioning analysis module includes a first analysis unit, a second analysis unit, a first positioning unit and a second positioning unit;

[0028] 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;

[0029] 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.

[0030] Further, 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 abnormal point condition, or determine the key area according to the abnormal difference coefficient of each abnormal point;

[0031] 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;

[0032] 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.

[0033] Furthermore, 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 influence point and its preset range, and determine the source coefficient of each abnormal point according to the abnormal duration of each abnormal point;

[0034] The source coefficient of each abnormal point is positively correlated with the abnormal duration of the corresponding abnormal point;

[0035] The first smoke exhaust condition is that the proportion of smoke exhaust points is greater than the proportion of preset smoke exhaust points.

[0036] Furthermore, 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;

[0037] The source coefficient of each non-critical influencing point is negatively correlated with the corresponding abnormal data change rate.

[0038] 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;

[0039] The abnormal difference coefficient is determined according to the temperature reference value and the smoke particle concentration value of each abnormal point;

[0040] 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.

[0041] 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, and reduce the requirements for the coverage of the monitoring equipment while ensuring the accuracy of the fire source positioning results.

[0042] 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 periodic 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.

[0043] 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 according to 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 ignition 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.

[0044] 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 influencing points. For key influencing 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 influencing points, the source coefficient of each abnormal point is determined according to the rate of change of abnormal data of each abnormal point. This makes the method of determining the source coefficient more in line with actual scenarios. The present invention improves the accuracy of fire source locating. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a module connection diagram of the anti-interference airport weak current cable of the present invention;

[0046] Figure 2 It is a structural schematic diagram of the cable body of the present invention;

[0047] Figure 3 It is a module structure block diagram of the data acquisition module of the present invention;

[0048] Figure 4 It is a module structure block diagram of the positioning analysis module of the present invention;

[0049] Figure 5 Module structure block diagram of the period detection module of the present invention;

[0050] In the figure: inner conductor 1, insulating layer 2, shielding layer 3, protective layer 4. DETAILED DESCRIPTION

[0051] 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 only used to explain the present invention and are not used to limit the present invention.

[0052] 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 protection scope of the present invention.

[0053] 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 drawings. This is merely 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.

[0054] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] See also Figure 1 As shown, it is a module connection diagram of the anti-interference airport weak current cable of the present invention. The present invention provides an anti-interference airport weak current cable, including:

[0056] The main body of the cable is used to transmit various types of data information;

[0057] 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;

[0058] 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;

[0059] 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;

[0060] The information transmission module is connected to the positioning analysis module and is used to transmit cable information to the user.

[0061] Among them, the target monitoring area in the present invention is a collection of cable tunnels where various weak-current cables in the airport are located, and the abnormal source obtained in the present invention is the fire point in the cable tunnel.

[0062] See also Figure 2 As shown, it is a schematic diagram of the structure of the cable body, and the cable body includes an inner conductor 1, an insulating layer 2, a shielding layer 3 and a protective layer 4.

[0063] Specifically, the cable body includes:

[0064] Inner conductor, used to transmit electric current or electromagnetic wave information;

[0065] 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;

[0066] An insulating layer, used for covering the inner conductor;

[0067] A shielding layer is used to isolate the electromagnetic field inside the shielding layer from the electromagnetic field outside the shielding layer;

[0068] The protective layer is used to protect the inner conductor, the insulating layer and the shielding layer.

[0069] Among them, 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 insulating layer can be made of polyvinyl chloride (PVC), the shielding layer can be copper wire braiding or aluminum foil, and the protective layer can be PVC or rubber. Users can make adaptive settings according to actual conditions.

[0070] See also Figures 3 to 5 , which are respectively the module structure block diagram 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.

[0071] Specifically, the data acquisition module includes:

[0072] A temperature monitoring unit, which includes a plurality of temperature sensors for collecting temperature reference values ​​of each monitoring point;

[0073] A smoke monitoring unit, which includes a number of smoke sensors for collecting smoke particle concentration values ​​at each monitoring point;

[0074] The wind speed monitoring unit comprises a plurality of wind speed detectors for collecting the longitudinal ventilation rate at each wind speed monitoring point.

[0075] The present invention does not set specific models of the temperature sensor, smoke sensor and wind speed detector used. Users can make adaptive selections according to actual working scenarios. The selected temperature sensor, smoke sensor and wind speed detector must ensure that they can detect the temperature, smoke concentration and longitudinal wind speed at their locations.

[0076] The monitoring point in the present invention is a position for monitoring the temperature reference value and the smoke particle concentration value, and the wind speed monitoring point is a position for monitoring the longitudinal ventilation rate. The present invention does not make specific limitations on the setting positions of the monitoring points and the wind speed monitoring points, and provides a method for setting the monitoring points, wherein a monitoring point is set at every 50m interval, and a method for setting the wind speed monitoring points is provided, wherein a wind speed monitoring point is set at every 100m interval, and a temperature sensor and a smoke sensor are set at the position of each monitoring point on the cable body, and a wind speed detector is set at the position of each wind speed monitoring point on the cable body. In the invention, each temperature sensor and each smoke sensor are arranged at a monitoring point, each wind speed detector is arranged at a wind speed monitoring point, and 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, the positioning analysis module and the information transmission module are packaged as a whole, which are arranged on the cable, and their specific positions are not limited. In addition, the periodic monitoring module, the positioning analysis module and the information transmission module are all electrically connected to the temperature sensors, smoke sensors and wind speed detectors in the data acquisition module.

[0077] Specifically, 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;

[0078] An abnormal data range is respectively set corresponding to the temperature reference value and the smoke particle concentration value.

[0079] Among them, the present invention has a cyclic data collection cycle, and the duration of the data collection cycle can be determined by the user. The higher the user's safety requirements for the weak current cable, the shorter the duration of the data collection cycle. A data collection cycle duration is provided, and the data collection cycle is 5 minutes. At the end of each data collection cycle, the temperature reference value and the smoke particle concentration value of each monitoring point are collected;

[0080] 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 0.5mg / m³. The categories of the monitoring points include abnormal points and normal points. The normal points are monitoring points whose temperature reference values ​​and smoke particle concentration values ​​are not within the corresponding abnormal data ranges.

[0081] Specifically, the periodic monitoring module includes a first monitoring unit and a second monitoring unit;

[0082] 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;

[0083] 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;

[0084] The suspected abnormal point is a monitoring point whose temperature difference value is greater than a preset temperature difference value.

[0085] 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, and 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 setting the preset temperature difference value is provided, and the minimum value of the temperature difference value of each suspected abnormal point in the historical record that meets the user's safety requirements for the weak current cable is recorded as the preset temperature difference value;

[0086] For a single suspected abnormal point, all monitoring points that perform 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 two monitoring points is the distance from one monitoring point to another monitoring point along the cable tunnel alone. The preset adjustment distance is positively correlated with the temperature difference value of the corresponding suspected abnormal point.

[0087] Specifically, the positioning analysis module includes a first analysis unit, a second analysis unit, a first positioning unit, and a second positioning unit;

[0088] 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;

[0089] 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.

[0090] 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 reliability requirement of the user for the fire source positioning result, the smaller the value of the preset distribution distance is. A method for setting the value of the preset distribution distance is provided, and the historical records without positioning analysis are recorded as reference records, and the average value of the tunnel distances between adjacent abnormal points in the reference records that meet the user's reliability requirements for the fire source positioning result is recorded as the preset distribution distance;

[0091] 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 reliability requirement of the fire source location result by the user, the larger the value of the preset number of abnormal points. A method for setting 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 reliability requirement of the fire source location result by the user is recorded as the preset number of abnormal points;

[0092] 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 is performed on each abnormal point, each abnormal point is recorded as an abnormal source point, and an early warning message is sent to the user.

[0093] Specifically, 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 abnormal point condition, or determine the key area according to the abnormal difference coefficient of each abnormal point;

[0094] 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;

[0095] 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.

[0096] Among them, the present invention has a cyclic wind speed monitoring cycle, and the duration of the wind speed monitoring cycle 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 cycle. The duration of a wind speed monitoring cycle is provided, and the wind speed monitoring cycle is 30 minutes. At the end of each wind speed monitoring cycle, the longitudinal ventilation rate of each wind speed monitoring point is collected;

[0097] 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 direction 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 result. Further selection is made for the positioning method according to 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 result 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 requirement for the fire source positioning result, the smaller the value of the preset longitudinal ventilation rate. A method for setting the value of the preset longitudinal ventilation rate is provided. The historical record of the key area determined according to the abnormal difference coefficient of each abnormal point is recorded as a wind speed reference record, and 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 requirement for the fire source positioning result is recorded as the preset longitudinal ventilation rate.

[0098] 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 influence point and its preset range, and determine the source coefficient of each abnormal point according to the abnormal duration of each abnormal point;

[0099] The source coefficient of each abnormal point is positively correlated with the abnormal duration of the corresponding abnormal point;

[0100] The first smoke exhaust condition is that the proportion of smoke exhaust points is greater than the proportion of preset smoke exhaust points.

[0101] 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.

[0102] For a single abnormal point, the abnormal influence coefficient is the number of monitoring points within a 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 points are abnormal points whose abnormal influence coefficients are greater than the preset abnormal coefficients, and the non-key influence points are abnormal points whose abnormal influence coefficients are less than or equal to the preset abnormal coefficients. 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 value of the preset abnormal coefficient is provided, and the average value of the abnormal influence coefficients of each abnormal point in the historical records that meet the user's reliability requirements for the fire source positioning result is recorded as the preset abnormal coefficient.

[0103] Specifically, 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;

[0104] The source coefficient of each non-critical influencing point is negatively correlated with the corresponding abnormal data change rate.

[0105] 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 cycle during the smoke exhaust duration phase and the temperature reference value collected in the previous data collection cycle. 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 cycle during the smoke exhaust duration phase and the smoke particle concentration value collected in the previous data collection cycle. The user can set the corresponding influence coefficient values ​​for the temperature change rate and the smoke concentration change rate according to actual needs, and provide a value of the influence coefficient corresponding to the temperature change rate, and the value of the influence coefficient corresponding to the temperature change rate is 0.4. Provide a value of the influence coefficient corresponding to the smoke concentration change rate, and the value of the influence coefficient corresponding to the smoke concentration change rate is 0.6.

[0106] 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 in the smoke exhaust process will cause a large change 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.

[0107] 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.

[0108] Specifically, 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;

[0109] The abnormal difference coefficient is determined according to the temperature reference value and the smoke particle concentration value of each abnormal point;

[0110] 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.

[0111] Among them, each abnormal point in a single abnormal sub-area is 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;

[0112] The abnormal points whose abnormal difference coefficients are greater than the preset abnormal difference coefficients are recorded as key points. For a single abnormal sub-area, the key area is the area between two key points that are 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, and the early warning module sends the obtained key area to the user as early warning information.

[0113] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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; An information transmission module, which is connected to the positioning analysis module and is used to transmit cable information to the user; 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.

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 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.

8. The anti-interference airport weak current cable according to claim 7, 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.

9. The anti-interference airport weak current cable according to claim 8, 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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