A cable trench temperature online monitoring system and method

Abstract

The present application discloses a cable trench temperature online monitoring system and method, the system includes: PC terminal, monitoring module, temperature prediction module, cooling module, fire protection module, alarm module, cloud platform and mobile terminal, the PC terminal is used to control and manage the cable trench temperature online monitoring system. The present application predicts the cable temperature change trend by setting the monitoring module, temperature prediction module, cooling module, fire protection module and alarm module. According to the predicted cable temperature change trend, it is convenient to control the ventilation and heat dissipation of the cable to ensure the working stability of the cable, and to warn the fire according to the predicted temperature change trend. The staff can get the alarm information in time, which is convenient for manual intervention, reducing the probability of fire and reducing economic losses. It solves the problem that the existing technology cannot predict the temperature change trend to predict whether cooling and heat dissipation and fire warning are needed.

Description

Technical Field

[0001] The present application relates to the technical field of cable trench monitoring, and in particular to a system and method for online monitoring of cable trench temperature. Background Art

[0002] The cable trench is an underground pipeline used for laying and replacing power or telecommunication cable facilities. It is also the enclosure structure for the laid cable facilities. There are rectangular, circular, arched and other pipeline structures. The cable trench layout in power plants and substations is related to the on-site equipment and terrain conditions. It generally has the following characteristics: The cable trench is a covered channel with simple civil construction and low cost. It is often used in substations and small and medium-sized power plants. Cable racks are installed in the cable trench. The cable racks are usually made of metal materials and are fixed to the trench wall by welding or screws to support the cables. Fire prevention measures are usually taken for cables in the cable trench, including painting fire retardant paint, sealing and isolation. During the operation of the cable, the cable will heat up, and heat accumulation can easily lead to fire, so the cable trench temperature needs to be monitored.

[0003] In the existing practice, temperature sensors are installed in the cable trench to monitor the temperature. However, the temperature sensors can only sense the current temperature, and heat dissipation and cooling can only be performed based on the currently monitored temperature. The temperature change trend cannot be predicted to predict whether cooling and heat dissipation and fire warning are needed. Summary of the invention

[0004] The present application provides a cable trench temperature online monitoring system and method, which is used to solve the technical problem that the prior art cannot predict the temperature change trend to prejudge whether cooling and heat dissipation and fire warning are needed.

[0005] In view of this, the first aspect of the present application provides a cable trench temperature online monitoring system, the system comprising:

[0006] PC terminal, monitoring module, temperature prediction module, cooling module, fire protection module, alarm module, cloud platform and mobile terminal;

[0007] The monitoring module is arranged at several monitoring points of the cable trench to collect the cable temperature and the smoke concentration in the cable trench;

[0008] The temperature prediction module is used to obtain historical temperature data of the cable through the PC terminal, and predict the temperature change trend of the cable based on the historical temperature data;

[0009] The PC terminal is respectively connected to the monitoring module, the temperature prediction module, the cooling module, the fire protection module, the alarm module and the cloud platform, serving as a data receiving, processing and storage center;

[0010] The cooling module is used to respond to the cooling instruction of the PC terminal and perform ventilation and heat dissipation processing on the cable;

[0011] The fire fighting module is used to respond to the fire fighting instruction of the PC terminal and extinguish the fire in the cable trench;

[0012] The alarm module is used to respond to the alarm instruction of the PC terminal and generate fault location information and sound and light alarm signals;

[0013] Wherein, the fire command, alarm command and cooling command are all generated by the PC terminal based on the comparison and analysis of the cable temperature change trend with the standard temperature and high temperature data range of the cable when it is working;

[0014] The mobile terminal is used to receive the cable temperature change trend, fault location information and sound and light alarm signals through the cloud platform.

[0015] Optionally, the temperature prediction module specifically includes: a temperature data processing unit and a temperature data prediction unit;

[0016] The temperature data processing unit is used to use the historical temperature data of the cable in a preset time period as a prediction reference to determine the maximum temperature value and the minimum temperature value;

[0017] The temperature data prediction unit is used to substitute the maximum temperature value and the minimum temperature value into the temperature prediction formula to calculate the cable prediction temperature, thereby obtaining the cable temperature change trend;

[0018] Wherein, the temperature prediction formula is:

[0019]

[0020] Where Ti is the predicted temperature, T max is the maximum temperature, T min is the minimum temperature, t e T max Time data, t f T min time data.

[0021] Optionally, the cooling module specifically includes: a ventilation and heat dissipation unit and an air filtering unit;

[0022] The ventilation and heat dissipation unit is used to sweep air from the cable trench so that the cable trench can be ventilated and the temperature can be reduced;

[0023] The air filter unit is used to filter the air entering the cable trench, thereby reducing the amount of dust entering the cable trench.

[0024] Optionally, the fire fighting module specifically comprises: a cover opening and closing unit and a carbon dioxide fire extinguishing unit;

[0025] The cover opening and closing unit is used to open or close the cable trench cover, thereby changing the oxygen content and air flow rate of the cable trench;

[0026] The carbon dioxide fire extinguishing unit is used to extinguish the fire point by using carbon dioxide.

[0027] Optionally, the alarm module specifically includes: a GPS positioning unit, an alarm information sending unit and an audible and visual alarm unit;

[0028] The GPS positioning unit is used to determine the location information of the fire in the cable trench according to the installation position of the monitoring module corresponding to the abnormal cable temperature change trend;

[0029] The sound and light alarm unit is used to respond to the alarm instruction of the PC terminal and generate sound and light alarm information;

[0030] The alarm information sending unit is used to send the fire location information and light alarm information to the PC terminal.

[0031] Optionally, the monitoring module specifically includes: a temperature data acquisition unit and a smoke data acquisition unit;

[0032] The temperature data acquisition unit is used to collect the temperature of the cable in real time;

[0033] The smoke data collection unit is used to collect the smoke concentration in the cable trench in real time.

[0034] Optionally, the cloud platform specifically includes: a wireless communication unit and a cloud storage unit;

[0035] The wireless communication unit is used to provide a wireless network for the mobile terminal to communicate with the PC terminal;

[0036] The cloud storage unit is used to store the data sent by the PC and provide data to the mobile terminal in response to the instruction of the mobile terminal.

[0037] Optionally, the PC terminal specifically includes: a data transceiver unit, a central processing unit and a storage unit;

[0038] The data transceiver unit is used to receive and forward data between the monitoring module, the temperature prediction module, the cooling module, the fire protection module, the alarm module and the cloud platform;

[0039] The central processing unit is used to generate the fire-fighting instruction, the temperature-lowering instruction and the alarm instruction;

[0040] The storage unit is used to store the cable temperature change trend, fault location information and sound and light alarm signals.

[0041] A second aspect of the present application provides a cable trench temperature online monitoring method, which is applied to the cable trench temperature online monitoring system described in the first aspect. The method comprises:

[0042] Collect cable temperature and smoke concentration in the cable trench to obtain historical temperature data of the cable;

[0043] The historical temperature data of the cable in a preset time period is used as a prediction reference, the maximum temperature value and the minimum temperature value are determined, and the maximum temperature value and the minimum temperature value are substituted into the temperature prediction formula to calculate the cable predicted temperature, thereby obtaining the cable temperature change trend;

[0044] Compare the cable temperature change trend with a preset standard temperature of the cable during operation to obtain a first analysis result, and determine whether to start a cooling module and a fire protection module according to the first analysis result;

[0045] The real-time smoke concentration data is compared with the preset cable trench standard smoke concentration to obtain an analysis result, and it is determined whether to start the cooling module, the fire fighting module or the alarm module according to the analysis result.

[0046] Optionally, the temperature prediction formula is:

[0047]

[0048] Where Ti is the predicted temperature, T max is the maximum temperature, T min is the minimum temperature, t e T max Time data, t f T min time data.

[0049] It can be seen from the above technical solutions that this application has the following advantages:

[0050] 1) By setting up monitoring module, temperature prediction module, cooling module, fire protection module and alarm module, the temperature change trend of the cable can be predicted. According to the predicted temperature change trend of the cable, it is convenient to control the ventilation, heat dissipation and cooling of the cable to ensure the working stability of the cable, and to warn of fire according to the predicted temperature change trend. The staff can get the alarm information in time, which is convenient for manual intervention and prevention of fire. It has the function of predicting fire, reducing the probability of fire and reducing economic losses.

[0051] 2) Use the smoke data collection unit to determine the fire. When a fire occurs, close the cable trench and extinguish the fire at the fire point, reducing the interval time of manual fire extinguishing, improving the fire extinguishing response speed, and making fire fighting more rapid and effective. At the same time, trigger the fire alarm, and send the fire alarm information and location information to the PC terminal and mobile terminal. The staff can get the fire alarm information in time, which is convenient for manual intervention in fire fighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic diagram of the structure of an embodiment of an online cable trench temperature monitoring system provided in an embodiment of the present application;

[0053] Figure 2 This is a flow chart of an embodiment of a cable trench temperature online monitoring method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] See also Figure 1 , a cable trench temperature online monitoring system provided in an embodiment of the present application includes: a PC terminal 1, a monitoring module 2, a temperature prediction module 3, a cooling module 4, a fire fighting module 5, an alarm module 6, a cloud platform 7 and a mobile terminal 8;

[0056] Monitoring module 2, which is set at several monitoring points in the cable trench and is used to collect cable temperature and smoke concentration in the cable trench;

[0057] It should be noted that the monitoring module of this embodiment specifically includes: a temperature data acquisition unit and a smoke data acquisition unit. The temperature data acquisition unit 21 is used to collect the temperature of the cable in real time; the smoke data acquisition unit 22 is used to collect the smoke concentration in the cable trench in real time.

[0058] The temperature prediction module 3 is used to obtain the historical temperature data of the cable through the PC terminal and predict the temperature change trend of the cable based on the historical temperature data;

[0059] It should be noted that the temperature prediction module of this embodiment specifically includes: a temperature data processing unit and a temperature data prediction unit; the temperature data processing unit 31 is used to use the historical temperature data of the cable in a preset time period as a prediction reference benchmark to determine the maximum temperature value and the minimum temperature value; the temperature data prediction unit 32 is used to substitute the maximum temperature value and the minimum temperature value into the temperature prediction formula to calculate the cable prediction temperature, thereby obtaining the cable temperature change trend;

[0060] The temperature prediction formula is:

[0061]

[0062] Where Ti is the predicted temperature, T max is the maximum temperature, T min is the minimum temperature, t e T max Time data, t f T min time data.

[0063] The PC terminal is connected to the monitoring module, temperature prediction module, cooling module, fire protection module, alarm module and cloud platform respectively, serving as the data receiving, processing and storage center;

[0064] It should be noted that the PC terminal of this embodiment specifically includes: a data transceiver unit, a central processing unit and a storage unit; the data transceiver unit 11 is used to receive and forward data between the monitoring module, the temperature prediction module, the cooling module, the fire protection module, the alarm module and the cloud platform; the central processing unit 12 is used to generate fire protection instructions, cooling instructions and alarm instructions; the storage unit 13 is used to store the cable temperature change trend, fault location information and sound and light alarm signals.

[0065] Four cooling modules are used to respond to the cooling instructions from the PC terminal and ventilate and dissipate heat for the cables;

[0066] It should be noted that the cooling module of this embodiment specifically includes: a ventilation and heat dissipation unit and an air filtration unit; the ventilation and heat dissipation unit 41 is used to sweep the cable trench so that the cable trench can be ventilated and the temperature can be reduced; the air filtration unit 42 is used to filter the air entering the cable trench so as to reduce the amount of dust entering the cable trench.

[0067] Fire fighting module 5, used to respond to the fire fighting instruction of the PC terminal and extinguish the fire in the cable trench;

[0068] It should be noted that the fire protection module of this embodiment specifically includes: a cover opening and closing unit and a carbon dioxide fire extinguishing unit; the cover opening and closing unit 51 is used to open or close the cable trench cover, thereby changing the oxygen content and air circulation of the cable trench; the carbon dioxide fire extinguishing unit 52 is used to extinguish the fire point through carbon dioxide.

[0069] The alarm module 6 is used to respond to the alarm command of the PC terminal and generate fault location information and sound and light alarm signals;

[0070] It should be noted that the alarm module of the present embodiment specifically includes: a GPS positioning unit, an alarm information sending unit and an audio-visual alarm unit; the GPS positioning unit 61 is used to determine the location information of the fire in the cable trench according to the installation position of the monitoring module corresponding to the abnormal cable temperature change trend; the audio-visual alarm unit 63 is used to respond to the alarm command of the PC terminal and generate audio-visual alarm information; the alarm information sending unit 62 is used to send the fire location information and the optical alarm information to the PC terminal.

[0071] Among them, fire instructions, alarm instructions and cooling instructions are all generated by the PC terminal based on the comparison and analysis of the cable temperature change trend and the standard temperature and high temperature data range when the cable is working;

[0072] The mobile terminal 8 is used to receive the cable temperature change trend, fault location information and sound and light alarm signals through the cloud platform 7.

[0073] It should be noted that the cloud platform of this embodiment specifically includes: a wireless communication unit and a cloud storage unit; the wireless communication unit 71 is used to provide a wireless network for communication between the mobile terminal and the PC terminal; the cloud storage unit 72 is used to store the data sent by the PC terminal, and respond to the instructions of the mobile terminal to provide data to the mobile terminal.

[0074] The above is an embodiment of a cable trench temperature online monitoring system provided in the embodiments of the present application, and the following is an embodiment of a cable trench temperature online monitoring method provided in the embodiments of the present application.

[0075] See also Figure 2 , a cable trench temperature online monitoring method provided in an embodiment of the present application comprises:

[0076] Step 201: collecting the cable temperature and the smoke concentration in the cable trench, thereby obtaining the historical temperature data of the cable;

[0077] It should be noted that the cable temperature is continuously and uninterruptedly collected and saved to obtain the historical temperature data of the cable, and the smoke concentration in the cable trench is monitored and collected in real time.

[0078] Step 202: Use the historical temperature data of the cable in a preset time period as a prediction reference, determine the maximum temperature and the minimum temperature, substitute the maximum temperature and the minimum temperature into the temperature prediction formula to calculate the cable prediction temperature, thereby obtaining the cable temperature change trend;

[0079] It should be noted that in the process of collecting temperature data, analyzing and integrating, the temperature data is set as T, the predicted temperature is Ti, and the standard temperature data range of the cable during operation is T a ~T b , Ta<T b ; Cable high temperature data range: T b ~T c , T b <T c ;

[0080] This embodiment uses the historical temperature data of the past minute as the prediction reference: where T max The time data is T e , T min The time data is T f ;

[0081] The temperature prediction formula is:

[0082]

[0083] Where Ti is the predicted temperature, T max is the maximum temperature, T min is the minimum temperature, t e T max Time data, t f T min time data.

[0084] Step 203: Compare the cable temperature variation trend with the preset standard temperature of the cable during operation to obtain a first analysis result, and determine whether to start the cooling module and the fire protection module according to the first analysis result;

[0085] In the specific implementation:

[0086] When Ti≤T a ≤T b or T a ≤Ti≤T b When the temperature data prediction unit 32 in the above system embodiment predicts that the temperature Ti is within the safe temperature data range, there is no need for ventilation and heat dissipation treatment, and the cable trench can meet the cable working requirements by air cooling itself;

[0087] When T b ≤Ti≤T cWhen the temperature data prediction unit 32 predicts that the temperature Ti is within the high temperature data range, the ventilation and heat dissipation unit 41 of the cooling module 4 is required to ventilate and dissipate the cable to reduce the temperature of the cable and ensure the working stability of the cable. At the same time, the air filter unit 42 filters the air of the ventilation and heat dissipation unit 41 to play the role of air purification and filtration, reduce dust from entering the cable trench, and prevent dust accumulation from affecting the heat dissipation of the cable;

[0088] When T b ≤T c ≤Ti, the temperature data prediction unit 32 predicts that the temperature Ti enters the ultra-high temperature dangerous temperature data range, and the ventilation and heat dissipation unit 41 of the cooling module 4 is required to ventilate and dissipate heat for the cable to reduce the temperature of the cable, and the cover opening and closing unit 51 of the fire protection module 5 opens the cover of the cable trench to enhance air circulation, improve heat dissipation efficiency, and enhance ventilation and heat dissipation effects.

[0089] Step 204: compare the real-time smoke concentration data with the preset cable trench standard smoke concentration to obtain an analysis result, and determine whether to start the cooling module, the fire protection module or the alarm module according to the analysis result.

[0090] In the specific implementation:

[0091] If the collected smoke concentration does not exceed the standard value of smoke concentration, the ventilation and heat dissipation unit 41 of the cooling module 4 continues to ventilate and dissipate heat for the cable, and continues to use air cooling to reduce the temperature of the cable. The cover opening and closing unit 51 of the fire protection module 5 keeps the cover of the cable trench open to ensure air circulation, improve heat dissipation efficiency, and enhance ventilation and heat dissipation effects. At the same time, a fire warning is triggered, and the alarm module 6 issues a warning. The GPS positioning unit 61 obtains positioning information, and the alarm information sending unit 62 sends the alarm information and positioning information to the PC terminal 1, and the PC terminal 1 sends the warning information to the cloud platform 7, and the cloud platform 7 transmits the warning information to the mobile terminal 8. The staff can learn the alarm information in time, which is convenient for manual intervention and prevent fire. It has the function of predicting fire, reducing the probability of fire, and reducing economic losses. The sound and light alarm unit 63 emits an orange warning light and a warning sound, which is convenient for the staff to intuitively grasp the location of the warning site and reduce the time consumed in finding the site.

[0092] If the collected smoke concentration exceeds the standard value of smoke concentration, the cover opening and closing unit 51 of the fire protection module 5 closes the cover of the cable trench. After the cable trench is sealed, the oxygen amount is reduced and the fire is weakened. The carbon dioxide fire extinguishing unit 52 is started to extinguish the fire at the fire point, reducing the interval time of manual fire extinguishing, improving the fire extinguishing response speed, and making fire fighting more rapid and effective.

[0093] Furthermore, in one embodiment, a fire alarm can also be triggered, the alarm module 6 sounds an alarm, the GPS positioning unit 61 obtains positioning information, the alarm information sending unit 62 sends the fire alarm information and positioning information to the PC terminal 1, and the PC terminal 1 sends the fire alarm information to the cloud platform 7, and the cloud platform 7 transmits the fire alarm information to the mobile terminal 8. The staff can get the fire alarm information in time, which is convenient for manual intervention in fire fighting. The sound and light alarm unit emits a red alarm light and an alarm sound, which is convenient for the staff to intuitively grasp the location of the fire scene, which is more intuitive and convenient.

[0094] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the modules and units of the system described above can refer to the corresponding processes in the above method embodiments and will not be repeated here.

[0095] The terms "first", "second", "third", "fourth", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0096] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0097] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0098] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0099] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0100] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0101] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cable trench temperature online monitoring system, characterized in that: include: PC terminal, monitoring module, temperature prediction module, cooling module, fire protection module, alarm module, cloud platform and mobile terminal; The monitoring module is arranged at several monitoring points of the cable trench to collect the cable temperature and the smoke concentration in the cable trench; The temperature prediction module is used to obtain historical temperature data of the cable through the PC terminal, and predict the temperature change trend of the cable based on the historical temperature data; The PC terminal is respectively connected to the monitoring module, the temperature prediction module, the cooling module, the fire protection module, the alarm module and the cloud platform, serving as a data receiving, processing and storage center; The cooling module is used to respond to the cooling instruction of the PC terminal and perform ventilation and heat dissipation processing on the cable; The fire fighting module is used to respond to the fire fighting instruction of the PC terminal and extinguish the fire in the cable trench; The alarm module is used to respond to the alarm instruction of the PC terminal and generate fault location information and sound and light alarm signals; Wherein, the fire command, alarm command and cooling command are all generated by the PC terminal based on the comparison and analysis of the cable temperature change trend with the standard temperature and high temperature data range of the cable when it is working; The mobile terminal is used to receive the cable temperature change trend, fault location information and sound and light alarm signals through the cloud platform; Wherein, the temperature prediction module specifically includes: a temperature data processing unit and a temperature data prediction unit; The temperature data processing unit is used to use the historical temperature data of the cable in a preset time period as a prediction reference to determine the maximum temperature value and the minimum temperature value; The temperature data prediction unit is used to substitute the maximum temperature value and the minimum temperature value into the temperature prediction formula to calculate the cable prediction temperature, thereby obtaining the cable temperature change trend; Wherein, the temperature prediction formula is: ； In the formula, is the predicted temperature, is the maximum temperature, is the minimum temperature, for Time data, for time data.

2. The cable trench temperature online monitoring system according to claim 1 is characterized in that: The cooling module specifically includes: a ventilation and heat dissipation unit and an air filtering unit; The ventilation and heat dissipation unit is used to sweep air from the cable trench so that the cable trench can be ventilated and the temperature can be reduced; The air filter unit is used to filter the air entering the cable trench, thereby reducing the amount of dust entering the cable trench.

3. The cable trench temperature online monitoring system according to claim 1 is characterized in that: The fire fighting module specifically comprises: a cover opening and closing unit and a carbon dioxide fire extinguishing unit; The cover opening and closing unit is used to open or close the cable trench cover, thereby changing the oxygen content and air flow rate of the cable trench; The carbon dioxide fire extinguishing unit is used to extinguish the fire point by using carbon dioxide.

4. The cable trench temperature online monitoring system according to claim 1 is characterized in that: The alarm module specifically includes: a GPS positioning unit, an alarm information sending unit and an audible and visual alarm unit; The GPS positioning unit is used to determine the location information of the fire in the cable trench according to the installation position of the monitoring module corresponding to the abnormal cable temperature change trend; The sound and light alarm unit is used to respond to the alarm instruction of the PC terminal and generate sound and light alarm information; The alarm information sending unit is used to send the fire location information and light alarm information to the PC terminal.

5. The cable trench temperature online monitoring system according to claim 1 is characterized in that: The monitoring module specifically includes: a temperature data acquisition unit and a smoke data acquisition unit; The temperature data acquisition unit is used to collect the temperature of the cable in real time; The smoke data collection unit is used to collect the smoke concentration in the cable trench in real time.

6. The cable trench temperature online monitoring system according to claim 1 is characterized in that: The cloud platform specifically includes: a wireless communication unit and a cloud storage unit; The wireless communication unit is used to provide a wireless network for the mobile terminal to communicate with the PC terminal; The cloud storage unit is used to store the data sent by the PC terminal and provide data to the mobile terminal in response to the instruction of the mobile terminal.

7. The cable trench temperature online monitoring system according to claim 1 is characterized in that: The PC terminal specifically includes: a data transceiver unit, a central processing unit and a storage unit; The data transceiver unit is used to receive and forward data between the monitoring module, the temperature prediction module, the cooling module, the fire protection module, the alarm module and the cloud platform; The central processing unit is used to generate the fire-fighting instruction, the temperature-lowering instruction and the alarm instruction; The storage unit is used to store the cable temperature change trend, fault location information and sound and light alarm signals.

8. A method for online monitoring of cable trench temperature, characterized in that: The method applied to the cable trench temperature online monitoring system described in any one of claims 1 to 7 comprises: Collect cable temperature and smoke concentration in the cable trench to obtain historical temperature data of the cable; The historical temperature data of the cable in a preset time period is used as a prediction reference, the maximum temperature value and the minimum temperature value are determined, and the maximum temperature value and the minimum temperature value are substituted into the temperature prediction formula to calculate the cable predicted temperature, thereby obtaining the cable temperature change trend; Compare the cable temperature change trend with a preset standard temperature of the cable during operation to obtain a first analysis result, and determine whether to start a cooling module and a fire protection module according to the first analysis result; Compare the real-time smoke concentration data with the preset cable trench standard smoke concentration to obtain a second analysis result, and determine whether to start a cooling module, a fire fighting module or an alarm module according to the second analysis result; Wherein, the temperature prediction formula is: ； In the formula, is the predicted temperature, is the maximum temperature, is the minimum temperature, for Time data, for time data.

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