Method for monitoring temperature of joint of low-voltage power cable in real time and special monitoring device

Abstract

The invention relates to a method for monitoring the temperature of a low-voltage power cable joint in real time and a special monitoring device. The method comprises the following steps: installing a temperature sensing module at each cable joint; the value of the temperature sensing module is uploaded to a signal receiving platform in real time by using a wireless data transmission technology; the signal receiving platform monitors the temperature value at the joint of each cable, and feeds back the temperature value to an inspection principal if the temperature value exceeds a set normal value; the device comprises a shell fixed on a cable connection point, and connecting lugs are fixedly connected to the two sides of the shell; the temperature sensing module is installed in the shell, and the detection end of the temperature sensing module faces the cable connection point and is used for monitoring the temperature of the cable connection point; the signal processing circuit board is arranged in the shell body and is connected with the temperature sensing module through a circuit, and a battery is also assembled on the single chip microcomputer; the Ble Bluetooth module is embedded on the signal processing circuit board; according to the invention, the condition of each cable connection point can be obtained in time, and the maintenance of a power pipe is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power safety, and in particular relates to a method for real-time monitoring of the temperature at a connection point of a low-voltage power cable and a special monitoring device. Background Art

[0002] At present, there are integrated power pipelines that include different types of low-voltage power cables. The cable connections are generally not equipped with corresponding monitoring devices. Short circuits may occur at the cable connections due to aging and other reasons, and the distribution box "circuit breaker" will directly trip.

[0003] According to accident data, the most common cause of the distribution box tripping is the aging of the connection point. In order to avoid power failures, the existing technology still manages the line operation status at regular inspections, and when the tripping occurs, the bad point is manually checked. However, since low-voltage cables are generally laid over a long distance and it is difficult to find the source of damage, the maintenance work after the tripping is huge, which wastes human resources. During daily inspections, special personnel must be arranged for regular inspections. Manual inspections have errors and cannot fully grasp the operation status of the power grid, and the supervision of the power grid status is not timely; the increase in the temperature of the low-voltage cable joint will also affect the power transmission performance of the entire cable, and may even cause major safety accidents. After a burn-out accident occurs, the entire circuit network is powered off, and it is difficult to effectively analyze the cause of the incident and the specific nodes afterwards. Therefore, in order to avoid unnecessary losses, temperature monitoring at the low-voltage cable joint position is essential. Summary of the invention

[0004] The purpose of the present invention is to provide a technical solution that can monitor the temperature of the connection points of low-voltage cables of different types in real time so as to judge the safety of power supply.

[0005] The present invention achieves the above-mentioned object by adopting the following technical solution: A method for real-time monitoring of the temperature at the connection of low-voltage power cables of different types. The first step is to install a temperature sensing module at each cable connection; The second step is to use wireless data transmission technology to upload the value of the temperature sensor module to the signal receiving platform in real time; The third step is to monitor the temperature of each cable connection through the signal receiving platform. If it exceeds the set normal value, it will be fed back to the inspection person in charge to remind him to check the condition of the connection.

[0006] Compared with the prior art, the present invention using the above method has the following beneficial effects: This solution installs temperature monitoring devices at the joints of low-voltage cables of different models, builds a wireless data network to monitor the data in real time, and can obtain the temperature changes of each cable connection point in time so as to respond in time.

[0007] The present invention also provides a special device for realizing the above-mentioned real-time monitoring of the cable connection, and the specific scheme is: A temperature monitoring device for a cable connection comprises: a shell fixed on a cable connection point, with connection ears fixedly connected on both sides of the shell; a temperature sensor module installed inside the shell, with a detection end thereof facing the cable connection point for monitoring the temperature of the cable connection point; a signal processing circuit board installed inside the shell, connected to the temperature sensor module through a line, and a battery is also installed on the single-chip microcomputer; a Ble Bluetooth module embedded on the signal processing circuit board, which is used for communication connection with a signal receiving platform; a fixing belt connected to the connection ear, and tied and fixed to the cable to fix the shell and the cable.

[0008] Compared with the prior art, the present invention adopting the above structure has the following beneficial effects: The device can monitor the temperature of cable connection nodes and send real-time temperature data to various receivers such as mobile phones via wireless signals, making it easy for staff to locate abnormal node locations, greatly facilitating the inspection and maintenance of power pipeline networks.

[0009] As a preferred embodiment, a further technical solution of the above structure is: The shell consists of a main body and a cover plate. A number of fixing grooves are arranged inside the main body. The temperature sensor module and the signal processing circuit board are embedded in the corresponding fixing grooves. The cover plate is detachably connected to the main body. The cover plate is provided with ventilation holes corresponding to the temperature sensor module and the Ble Bluetooth module.

[0010] The beneficial effects obtained by the above features are as follows: the shell has a simple structure, the internal assembly structure has good stability and is not easily damaged.

[0011] The connecting ear can be simply a C-shaped ear made of C-shaped ribs, with a hole through which a fixing belt passes; a detachable structure can also be adopted, such as the connecting ear consisting of two fixing columns and a connecting rod, one end of the fixing column is fixedly connected to the shell body, and the other end is provided with a through hole; the end of the fixing belt is sleeved on the connecting rod, the two ends of the connecting rod are installed in the through holes, and the outer end of the connecting rod is fixed with screws.

[0012] The fixing belt is a hemp rope, a nylon rope, or a webbing with a certain width.

[0013] The beneficial effects obtained by the above features are: the rope is easy to obtain, the webbing has a certain width, and the binding effect on the cable is good.

[0014] The side of the shell that contacts the cable is provided with double-sided adhesive.

[0015] The beneficial effect obtained by the above-mentioned features is that before being fixed by the fixing belt, the shell can be pre-fixed with the cable connection by the double-sided adhesive, so as to facilitate installation and positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the temperature monitoring device of the present invention; Figure 2 It is the internal structure diagram of the temperature monitoring device of the present invention; Figure 3 Schematic diagram of the connection ear of the temperature monitoring device of the present invention; Figure 4 It is a schematic diagram of the installation of the temperature monitoring device of the present invention (cable section); Figure 5 It is a schematic diagram of the installation structure of the temperature monitoring device of the present invention (cable top view).

[0017] In the figure: 1. Main body; 2. Fixed card slot; 3. Cover plate; 4. Through hole; 5. Connecting ear; 51. Fixed column; 52. Connecting rod; 6. Ble Bluetooth module; 7. Temperature sensor module; 8. Single chip microcomputer chip; 9. Fixed belt; 10. Cable connection point. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0019] See also Figures 1 to 5 The present invention aims to solve the problem that the connection points of low-voltage power cables of different models are broken due to aging, which has an adverse effect on the power network. A method for predicting and judging the risk of breaking at the connection point by monitoring the temperature of each cable connection point is proposed. The specific design scheme is: A method for real-time monitoring of the temperature at the connection of low-voltage power cables of different types. The first step is to install a temperature sensor module 7 at each cable connection; The second step is to use wireless data transmission technology to upload the value of the temperature sensor module 7 to the signal receiving platform in real time; The third step is to monitor the temperature of each cable connection through the signal receiving platform. If it exceeds the set normal value, it will be fed back to the inspection person in charge to remind him to check the condition of the connection.

[0020] The method can monitor the usage status of the cables throughout the power grid in real time, and promptly discover abnormal conditions at the cable connections, so as to achieve the effect of timely handling and preventing electricity risks.

[0021] Since the cable extends for a very long distance along building structures such as passages and garages, it is very costly to install a temperature detector at each cable connection point 10. The temperature detection devices commonly used in the prior art are large in size and difficult to install inside the bridge. Therefore, the present invention provides a special temperature monitoring device with small size, simple structure, low cost, and can be arranged along the entire cable line.

[0022] The temperature monitoring device of the cable connection point 10 provided by the present invention comprises: The housing is fixed on the cable connection point 10, and the two sides of the housing are fixed with connection ears 5; The temperature sensing module 7 is installed inside the housing, and its detection end faces the cable connection point 10 to monitor the temperature of the cable connection point 10; The signal processing circuit board 8 is installed inside the shell and connected to the temperature sensor module 7 through a line. The single chip is also equipped with a battery; Ble Bluetooth module, embedded on the signal processing circuit board 8; The fixing belt 9 is connected to the connecting ear 5 and is tied and fixed to the cable so as to fix the housing and the cable.

[0023] The diameter of the low-voltage power cable is 5 cm to 6 cm, and the connection node is the end of two cables tied together, so the diameter can be increased to 7 cm to 8 cm. The shell of this device is designed to install only two electronic components, the temperature sensor module 7 and the Ble Bluetooth module, so the volume does not need to be too large. The shell diameter of this solution is about 5 cm to 6 cm. In this solution, the temperature sensor module 7 uses a small sensor, such as DS18B20, or an infrared sensor, such as GY906, MLX90614, etc.

[0024] As an option, the housing is composed of a body 1 and a cover plate 3. The interior of the body 1 is solid and is provided with a plurality of fixed card slots 2. The temperature sensor module 7 and the Ble Bluetooth module are both embedded in the fixed card slots 2. The cover plate 3 is detachably connected to the body 1. The cover plate 3 is provided with ventilation holes corresponding to the temperature sensor module 7 and the Ble Bluetooth module. The beneficial effects obtained by the above features are: the housing has a simple structure, and the internal assembly structure has good stability and is not easy to be damaged.

[0025] Optionally, a circle of double-sided tape is provided on the outer periphery of the cover plate 3. The surface is torn off during installation, and the shell and the cable connection point 10 are pre-fixed by the double-sided tape, so that the shell is in a slightly stable position, which is convenient for fixing with the fixing belt 9 at the back.

[0026] The connecting ear 5 can be simply a C-shaped ear made of C-shaped ribs, with a hole through which the fixing belt 9 passes; it can also adopt a detachable structure, such as: the connecting ear 5 is composed of two fixing columns 51 and a connecting rod 52, one end of the fixing column 51 is fixedly connected to the shell body 1, and the other end is provided with a through hole 4; the connecting rod 52 is passed through the end of the fixing belt 9, and its two ends are installed in the through hole 4, and the outer end of the connecting rod 52 is fixed with screws.

[0027] The fixing belt 9 is a hemp rope, a nylon rope, or a webbing with a certain width. The rope is easy to obtain, and the webbing has a certain width, which has a good binding effect on the cable. Two webbings are respectively wrapped around the cable and the shell from both sides. After the binding is firm, the rear ends are connected together by buckles.

[0028] This solution uses the temperature sensor module 7 to collect temperature data, and uploads the real-time measured data through the data upload function of the Ble Bluetooth module 6. The receiver can be a paired receiver in the control center or any mobile phone.

[0029] The temperature data uploaded by the Ble Bluetooth module 6 carries the location and number. The control center directly locates the corresponding node through the reported data. After determining the fault location, it is installed for inspection and repair.

[0030] In this solution, the cable is laid in an environment with low and stable ambient temperature such as underground car rooms and inside buildings. When the cable is operating normally, there is no temperature on the surface. When the internal temperature rises, the cable skin and the inner core are in contact for heat transfer, and the temperature change can be reflected on the cable surface. The greater the internal current, the higher the surface temperature. In this solution, the temperature sensor directly detects the skin temperature, which is fully capable of determining whether the cable connection is abnormally overheated. In this solution, when the measured temperature is above 50 degrees, it is determined to be abnormal. The temperature sensor module 7 encapsulated inside the shell measures the temperature of the cable connection. After the temperature sensor module 7 measures the data, it transmits the data to the signal processing circuit board 8. The data of the temperature sensor module 7 is analyzed by the chip system set in the signal processing circuit board 8, and transmitted to the mobile phone or the signal receiving platform through the Ble Bluetooth module 6, so as to perform real-time monitoring. The management platform displays the number of the cable connection or displays the location through a map.

[0031] The advancement of this solution: When the temperature of the low-voltage cable joint changes, the data on the instrument can be updated in real time; the data can be uploaded to the platform to ensure traceability; at the same time, the operation is simple, and the mobile phone can obtain real-time information on the change of the low-voltage cable joint temperature.

[0032] Necessity of this solution: The increase in temperature of low-voltage cable joints will affect the power transmission performance of the entire cable and may even cause major safety accidents. In order to avoid unnecessary losses, temperature monitoring of low-voltage cable joints is essential.

[0033] Applicability of this solution: After installing this device at low-voltage cable joints of different models, real-time monitoring can be carried out through the data on the mobile phone to obtain the temperature changes at the low-voltage cable joints of different models in time so as to respond in time.

[0034] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A method for real-time monitoring of the temperature at a low-voltage power cable connection, characterized in that: The first step is to install a temperature sensing module (7) at each cable connection; The second step is to use wireless data transmission technology to upload the value of the temperature sensor module (7) to the signal receiving platform in real time; The third step is to monitor the temperature of each cable connection through the signal receiving platform. If it exceeds the set normal value, it will be fed back to the inspection person in charge to remind him to check the condition of the connection.

2. A cable connection temperature monitoring device, characterized in that: include A housing fixed to the cable connection point (10), with connection ears (5) fixedly connected to both sides of the housing; A temperature sensing module (7) is installed inside the housing, with a detection end thereof facing the cable connection point (10) and used for monitoring the temperature of the cable connection point (10); A signal processing circuit board is installed inside the shell and is connected to the temperature sensor module (7) through a line. A battery is also installed on the single chip computer; Ble Bluetooth module, embedded on the signal processing circuit board; The fixing belt (9) is connected to the connecting ear (5) and is tied and fixed to the cable, thereby fixing the housing and the cable.

3. The cable connection temperature monitoring device according to claim 2, characterized in that: The shell is composed of a main body (1) and a cover plate (3); a plurality of fixing grooves are arranged inside the main body (1); a temperature sensor module (7) and a signal processing circuit board are both embedded in the corresponding fixing grooves; the cover plate (3) is detachably connected to the main body (1); and ventilation holes are respectively arranged on the cover plate (3) corresponding to the temperature sensor module (7) and the Ble Bluetooth module.

4. The cable connection temperature monitoring device according to claim 2, characterized in that: The connecting ear (5) is a C-shaped rib having a hole for the fixing belt (9) to pass through.

5. The cable connection temperature monitoring device according to claim 2, characterized in that: The connecting ear (5) is composed of two fixing columns (51) and a connecting rod (52). One end of the fixing column (51) is fixedly connected to the housing body (1), and the other end is provided with a through hole (4). The end of the fixing belt (9) is sleeved on the connecting rod (52), and both ends of the connecting rod (52) are installed in the through hole (4). The outer end of the connecting rod (52) is fixed by a screw.

6. The cable connection temperature monitoring device according to claim 2, characterized in that: The fixing belt (9) is a hemp rope or a nylon rope.

7. The cable connection temperature monitoring device according to claim 2, characterized in that: The fixing belt (9) is a webbing with a certain width.

8. The cable connection temperature monitoring device according to claim 7, characterized in that: The webbing has two strips, which are respectively connected to the two connecting ears (5), and the free ends of the two webbings are connected by a buckle.

9. The cable connection temperature monitoring device according to claim 2, characterized in that: The side of the shell that contacts the cable is provided with double-sided adhesive.

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