High-voltage cable intermediate head temperature measurement system and temperature measurement method

Abstract

The invention discloses a high-voltage cable intermediate head temperature measurement system and a temperature measurement method, and belongs to the technical field of energy management. The system comprises a plurality of temperature acquisition wireless transmission terminals, an Internet of Things platform server and an application server. The temperature acquisition wireless transmission terminal is installed at the middle head position of each high-voltage cable. The temperature acquisition wireless transmission terminal comprises a temperature sensor unit, an NB-IoT communication unit, a power supply unit and a main control unit. The application server obtains the temperature data from the Internet of Things platform server through the interface, and the application server comprises a map display unit and an alarm management unit. The problems that long-distance temperature measurement cannot be achieved and temperature data of all point positions cannot be visually and comprehensively monitored in the prior art are solved. According to the invention, long-distance temperature signal wireless transmission can be realized, the map positioning of the equipment and the current temperature state and point position name of the equipment can be displayed on a map, and the device has the advantages of simple structure, practicability and intuition.

Description

Technical Field

[0001] The present invention relates to the technical field of energy management, and in particular to a high-voltage cable intermediate head temperature measurement system and method. Background Art

[0002] In metallurgical power supply systems, due to site constraints, cables with voltage ratings of 10kV and above have become the primary means of power supply. The widespread use of cables has led to the widespread use of cable intermediate connectors. Because they withstand high voltages and currents, cable intermediate connectors are a weak link in cable power supply. Currently, maintenance personnel rely on visual inspection to determine if cable intermediate connectors, located overhead or in cable trenches outside substations, are faulty. This is not only inefficient but also subject to significant subjective error.

[0003] The most effective way to monitor the operating status of a cable's middle connector is to measure its temperature. Cable operating temperature is a critical parameter, and temperature fluctuations reflect changes in the cable's operating status. Abnormal cable operation is often manifested as abnormal temperature fluctuations. When the cable operates under rated load, the core temperature reaches the allowable value. Once the cable is overloaded, the core temperature rises sharply, accelerating insulation aging and even causing thermal breakdown. Real-time monitoring of cable temperature can effectively prevent accidents and ensure the safe operation of the cable. Existing temperature measurement systems mostly use wired transmission, which is complex and costly to implement when the distance between the temperature measurement point and the substation is long. Existing wireless temperature measurement systems use very short signal transmission ranges, mostly within 200 meters, which cannot meet the requirements of long-distance temperature measurement.

[0004] A Chinese patent with announcement number CN110514309B discloses a wireless temperature sensor and a wireless temperature measurement device containing the sensor. The wireless temperature sensor senses the temperature of the cable through a temperature measuring probe, converts it into an electrical signal through a data acquisition system and a data processing system, and then transmits the electrical signal to a receiving node through the antenna of a data transmission and receiving system, thereby improving the accuracy and reliability of cable temperature monitoring. However, the transmission distance of this patent is only about 5 meters, which cannot meet the requirements of long-distance temperature measurement, and it does not have a map positioning function.

[0005] Chinese patent publication number CN114184286A discloses a low-power wireless temperature measurement system, device, and early warning method for power cables. A temperature sensor is attached to the surface of a power cable at a point to be measured and transmits an electrical signal to a wireless temperature measurement device. The wireless temperature measurement device performs signal amplification processing on the wireless signal to obtain a signal-enhanced wireless signal, and transmits the signal-enhanced wireless signal to a signal relay module. Furthermore, a temperature monitoring module determines the surface temperature of the power cable at the point to be measured based on the temperature data signal from the surface of the point to be measured. This patent is flexibly applicable to various cable laying environments and has a wide temperature measurement range. However, the patent has a transmission distance of approximately 200 meters, which does not meet the requirements of long-distance temperature measurement, and it lacks a mapping function. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-voltage cable intermediate head temperature measurement system, which solves the problem of long-distance wireless transmission of temperature signals. At the same time, the map location of the device and the current temperature status and point name of the device can be displayed on the map. It has the advantages of simple structure, reliable performance, convenience, practicality and intuitiveness, and solves the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high-voltage cable middle head temperature measurement system includes multiple temperature acquisition wireless transmission terminals, an Internet of Things (IoT) platform server, and an application server. The temperature acquisition wireless transmission terminals are installed at each high-voltage cable middle head and include a temperature sensor unit, an NB-IoT communication unit, and a power supply unit. The application server obtains temperature data from the IoT platform server via an interface and includes a map display unit, an alarm management unit, and an alarm notification unit.

[0009] The temperature sensor unit is configured to collect the surface temperature of the cable intermediate head;

[0010] The NB-IoT communication unit is configured to perform wireless data transmission through a telecommunications NB-IoT base station of a telecommunications operator;

[0011] The main control unit is connected to the temperature sensor unit and the NB-IoT communication unit and is configured to control temperature collection and data transmission;

[0012] The power supply unit is configured to supply power to the temperature sensor unit, the NB-IoT communication unit and the main control unit;

[0013] The Internet of Things platform server is configured to receive and collect temperature data of the cable intermediate head and perform protocol conversion;

[0014] The map display unit is configured to load and display an electronic map, dynamically display an icon representing each temperature collection wireless transmission terminal at a corresponding coordinate position on the electronic map based on a preset binding relationship between the device ID and the geographic coordinates, display the point name and measured temperature value of the corresponding temperature collection wireless transmission terminal at the icon in real time, and dynamically change the visual state of the icon to indicate the temperature status based on a comparison result between the current temperature value and a preset threshold value;

[0015] The alarm management unit is configured to generate alarm information based on the received data and preset rules;

[0016] The alarm notification unit is configured to push alarm information through at least one of the platform interface, text message or mobile APP. The alarm information also includes the point name and geographical location information of the temperature collection wireless transmission terminal that triggered the alarm.

[0017] Preferably, the preset rules include:

[0018] The absolute temperature value exceeds the configured warning threshold or emergency threshold;

[0019] The temperature rise rate per unit time exceeds the set rate threshold;

[0020] The communication interruption duration of the temperature collection wireless transmission terminal exceeds the set threshold;

[0021] The battery level of the temperature acquisition wireless transmission terminal drops to the set battery threshold.

[0022] Preferably, the temperature acquisition wireless transmission terminal further includes a mounting structure, which includes:

[0023] High temperature resistant cable ties, used to fix the temperature sensor probe to the surface of the cable middle head;

[0024] Bolts or magnetic fixing devices are used to fix the terminal body to the adjacent support.

[0025] Preferably, the visual state of the icon indicates the temperature state by color change, including:

[0026] The first color is used to indicate that the temperature is below the warning threshold, that is, the normal state;

[0027] The second color is used to indicate that the temperature reaches or exceeds the warning threshold but is below the emergency threshold, i.e., the warning state;

[0028] The third color is used to indicate that the temperature reaches or exceeds the emergency threshold, i.e., a fault state;

[0029] The fourth color is used to indicate that the temperature collection wireless transmission terminal is in an offline state.

[0030] Preferably, the NB-IoT communication unit supports China Telecom's NB-IoT frequency band and uses the COAP protocol to send data to the Internet of Things platform server.

[0031] Preferably, the Internet of Things platform server is connected to the application server through an HTTP interface.

[0032] Preferably, the map display unit integrates a commercial map API service.

[0033] Preferably, the temperature sensor unit adopts a DS18B20 digital temperature sensor.

[0034] A method for measuring the temperature of a high-voltage cable intermediate connector is implemented based on a high-voltage cable intermediate connector temperature measurement system, comprising the following steps:

[0035] Step 1: The temperature sensor senses the cable surface temperature in real time, and the built-in NB-IoT communication unit transmits the temperature data remotely and wirelessly via the NB-IoT network.

[0036] Step 2: The data is uploaded to the IoT platform server via the NB-IoT base station and pushed to the application server after completing the protocol conversion;

[0037] Step 3: The application server loads the electronic map base map and dynamically generates a terminal identification icon at the corresponding location based on the preset device ID and geographic coordinate binding relationship;

[0038] Step 4: Receive temperature data in real time and compare the current temperature value with the preset threshold. Change the icon color to intuitively reflect the device's online status and temperature abnormality level. When temperature exceeds the limit or communication is interrupted, the icon will automatically flash and a multi-channel alarm will be triggered.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. This invention is based on the operator's NB-IoT's long-distance wireless temperature measurement and transmission, and applies NB-IoT cellular Internet of Things technology to the temperature monitoring scenario of the middle head of high-voltage cables. It fully utilizes its characteristics of wide coverage, strong penetration, multiple connections, and long-distance support, and effectively solves the pain point of the long distance between the temperature measurement point and the monitoring center in large-scale and complex environments such as metallurgical plants, which is difficult to cover with traditional wireless technologies.

[0041] 2. The present invention achieves global monitoring of the operating status of wide-area distributed cable intermediate heads by binding each temperature measurement terminal to its precise geographic coordinates and using a map to dynamically display location icons, real-time temperature status and point names on the platform, realizing global visualization of the status and greatly improving monitoring efficiency and emergency response speed.

[0042] 3. The present invention has a simple structure and does not require a complex wireless network to be built. The temperature acquisition wireless transmission terminal is ready for installation. Installation only requires fixing the sensor probe and the terminal body. There is no need to lay long-distance communication cables or deploy dedicated gateways. The NB-IoT connection based on the public network eliminates the need for complex network maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a system module structure diagram of the present invention;

[0044] Figure 2 It is a system workflow diagram of the present invention. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] In order to solve the problem that existing technology cannot achieve long-distance temperature measurement and cannot intuitively and comprehensively monitor the temperature data of each point, please refer to Figure 1-2 , this embodiment provides the following technical solutions:

[0047] A high-voltage cable intermediate head temperature measurement system includes multiple temperature acquisition wireless transmission terminals, an Internet of Things platform server, and an application server.

[0048] The temperature acquisition wireless transmission terminal is installed at the middle head of each high-voltage cable. The temperature acquisition wireless transmission terminal includes a temperature sensor unit, an NB-IoT communication unit, a power supply unit and a main control unit.

[0049] The temperature sensor unit is configured to collect the surface temperature of the cable middle head. The temperature sensor unit adopts DS18B20 digital temperature sensor, which collects temperature between -40℃~+85℃ with an accuracy of ±0.5℃. The temperature measuring probe at the front end of the temperature sensor is tied to the surface of the cable middle head with a high-temperature resistant cable tie, and the tightness can be normal.

[0050] The temperature collection wireless transmission terminal body is fixed to the adjacent support by bolts or magnetic fixing devices. When each deployed temperature collection wireless transmission terminal is installed, its unique device ID and the precise geographic coordinates of the installation point are registered and registered in the platform.

[0051] The NB-IoT communication unit is configured to transmit wireless data through the telecom operator's NB-IoT base station. The NB-IoT communication unit supports China Telecom's NB-IoT frequency band and uses the COAP protocol to send data to the IoT platform server. NB-IoT communication is the core of achieving long-distance transmission. It utilizes the telecom operator's wide-coverage cellular network, has strong penetration capabilities, and a wide coverage range, far exceeding the 200-meter limit, making it suitable for access to dispersed equipment in complex factory environments.

[0052] The main control unit is connected to the temperature sensor unit and the NB-IoT communication unit and is configured to control temperature collection and data transmission;

[0053] The power supply unit has a built-in 3.6V lithium battery to ensure long-term operation and power the temperature sensor unit, NB-IoT communication unit and main control unit;

[0054] The temperature acquisition wireless transmission terminal does not require complex wiring or additional relay equipment, and is extremely easy to install.

[0055] The IoT platform server is configured to receive and aggregate the temperature data of the cable middle head, perform protocol conversion, and communicate with the application server through the HTTP interface.

[0056] The application server obtains temperature data from the Internet of Things platform server through an interface. The application server includes a map display unit, an alarm management unit and an alarm notification unit.

[0057] The map display unit's functions include: loading and displaying electronic maps; dynamically displaying the icons of each temperature acquisition wireless transmission terminal at the corresponding coordinate location on the electronic map based on the preset device ID and precise geographic coordinates; displaying the point name and measured temperature value of the corresponding temperature acquisition wireless transmission terminal in real time at the icon; and dynamically changing the icon's visual state to indicate the temperature status based on the comparison between the current temperature value and the preset threshold. The electronic map is intuitively designed and easy to navigate, visually displaying the temperature status of dispersed cable intermediate heads based on geographic location, greatly improving monitoring efficiency.

[0058] The visual status of the icon indicates the temperature status through color changes. The first color is used to indicate that the temperature is lower than the warning threshold, that is, the normal state; the second color is used to indicate that the temperature reaches or exceeds the warning threshold but is lower than the emergency threshold, that is, the warning state; the third color is used to indicate that the temperature reaches or exceeds the emergency threshold, that is, the fault state; the fourth color is used to indicate that the temperature acquisition wireless transmission terminal is offline. For example, 60°C is set as the highest threshold for normal state, and 80°C is set as the highest threshold for warning state.

[0059] The map display unit integrates commercial map API services, such as Baidu Map JavaScript API or Amap JS API as a base map, calls the point marking function of the map API, and places an icon next to the coordinates of each temperature collection wireless transmission terminal.

[0060] An information window is bound to each icon. When the icon is clicked, the window pops up and displays the point name, current temperature value, data update time and device status.

[0061] The alarm management unit is configured to generate alarm information based on the received data and preset rules, wherein the preset rules include:

[0062] The absolute temperature value exceeds the configured warning threshold or emergency threshold;

[0063] The temperature rise rate per unit time exceeds the set rate threshold;

[0064] The communication interruption duration of the temperature collection wireless transmission terminal exceeds the set threshold;

[0065] The battery level of the temperature acquisition wireless transmission terminal drops to the set battery threshold;

[0066] The alarm notification unit is configured to push alarm information through at least one of the platform interface, text message or mobile APP. The alarm information also includes the point name and geographic location information of the temperature collection wireless transmission terminal that triggered the alarm.

[0067] A method for measuring the temperature of a high-voltage cable intermediate connector is implemented based on a high-voltage cable intermediate connector temperature measurement system, comprising the following steps:

[0068] Step 1: The temperature sensor senses the cable surface temperature in real time, and the built-in NB-IoT communication unit transmits the temperature data remotely and wirelessly via the NB-IoT network.

[0069] Step 2: The data is uploaded to the IoT platform server via the NB-IoT base station and pushed to the application server after completing the protocol conversion;

[0070] Step 3: The application server loads the electronic map base map and dynamically generates a terminal identification icon at the corresponding location based on the preset device ID and geographic coordinate binding relationship;

[0071] Step 4: Receive temperature data in real time and compare the current temperature value with the preset threshold. Change the icon color to intuitively reflect the device's online status and temperature abnormality level. When temperature exceeds the limit or communication is interrupted, the icon will automatically flash and a multi-channel alarm will be triggered.

[0072] Working Principle: The temperature sensor senses the cable surface temperature in real time. The built-in NB-IoT communication unit transmits the temperature data remotely and wirelessly via the NB-IoT network. The data is uploaded to the IoT platform server via the NB-IoT base station and pushed to the application server after protocol conversion. The application server loads the electronic map base map and dynamically generates a terminal identification icon at the corresponding location based on the preset device ID and geographic coordinate binding relationship. The system parses the received temperature data in real time, compares the current temperature value with the preset threshold, and intuitively reflects the device's online status and temperature anomaly level by changing the icon color. When the temperature exceeds the limit or communication is interrupted, the icon flashes and a multi-channel alarm is automatically triggered.

[0073] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0074] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A high-voltage cable intermediate connector temperature measurement system, characterized by: It includes multiple temperature collection wireless transmission terminals, an IoT platform server, and an application server. The temperature collection wireless transmission terminal is installed at the middle head of each high-voltage cable and includes a temperature sensor unit, an NB-IoT communication unit, and a power supply unit. The application server obtains temperature data from the IoT platform server through an interface and includes a map display unit, an alarm management unit, and an alarm notification unit. The temperature sensor unit is configured to collect the surface temperature of the cable intermediate head; The NB-IoT communication unit is configured to perform wireless data transmission through a telecommunications NB-IoT base station of a telecommunications operator; The power supply unit is configured to supply power to the temperature sensor unit and the NB-IoT communication unit; The Internet of Things platform server is configured to receive and collect temperature data of the cable intermediate head and perform protocol conversion; The map display unit is configured to load and display an electronic map, dynamically display an icon representing each temperature collection wireless transmission terminal at a corresponding coordinate position on the map based on a preset binding relationship between the device ID and the geographic coordinates, display the point name and measured temperature value of the corresponding temperature collection wireless transmission terminal at the icon in real time, and dynamically change the visual state of the icon to indicate the temperature status based on a comparison result between the current temperature value and a preset threshold value; The alarm management unit is configured to generate alarm information based on the received data and preset rules; The alarm notification unit is configured to push alarm information through at least one of the platform interface, text message or mobile APP. The alarm information also includes the point name and geographical location information of the temperature collection wireless transmission terminal that triggered the alarm.

2. A high-voltage cable intermediate connector temperature measurement system according to claim 1, characterized in that: The preset rules include: The absolute temperature value exceeds the configured warning threshold or emergency threshold; The temperature rise rate per unit time exceeds the set rate threshold; The communication interruption duration of the temperature collection wireless transmission terminal exceeds the set threshold; The battery level of the temperature acquisition wireless transmission terminal drops to the set battery threshold.

3. A high-voltage cable intermediate connector temperature measurement system according to claim 2, characterized in that: The temperature acquisition wireless transmission terminal also includes a mounting structure, which includes: High temperature resistant cable ties, used to fix the temperature sensor probe to the surface of the cable middle head; Bolts or magnetic fixing devices are used to fix the terminal body to the adjacent support.

4. A high-voltage cable intermediate connector temperature measurement system according to claim 3, characterized in that: The visual status of the icon indicates the temperature status by color change, including: The first color is used to indicate that the temperature is below the warning threshold, that is, the normal state; The second color is used to indicate that the temperature reaches or exceeds the warning threshold but is below the emergency threshold, i.e., the warning state; The third color is used to indicate that the temperature reaches or exceeds the emergency threshold, i.e., a fault state; The fourth color is used to indicate that the temperature collection wireless transmission terminal is in an offline state.

5. A high-voltage cable intermediate connector temperature measurement system according to claim 4, characterized in that: The NB-IoT communication unit supports China Telecom's NB-IoT frequency band and uses the COAP protocol to send data to the IoT platform server.

6. A high-voltage cable intermediate connector temperature measurement system according to claim 5, characterized in that: The Internet of Things platform server is connected to the application server through an HTTP interface.

7. A high-voltage cable intermediate connector temperature measurement system according to claim 6, characterized in that: The map display unit integrates a commercial map API service.

8. A high-voltage cable intermediate connector temperature measurement system according to claim 7, characterized in that: The temperature sensor unit adopts DS18B20 digital temperature sensor.

9. A method for measuring the temperature of a high-voltage cable intermediate connector, implemented based on a high-voltage cable intermediate connector temperature measurement system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: The temperature sensor senses the cable surface temperature in real time, and the built-in NB-IoT communication unit transmits the temperature data remotely and wirelessly via the NB-IoT network. Step 2: The data is uploaded to the IoT platform server via the NB-IoT base station and pushed to the application server after completing the protocol conversion; Step 3: The application server loads the electronic map base map and dynamically generates a terminal identification icon at the corresponding location based on the preset device ID and geographic coordinate binding relationship; Step 4: Receive temperature data in real time and compare the current temperature value with the preset threshold. Change the icon color to intuitively reflect the device's online status and temperature abnormality level. When temperature exceeds the limit or communication is interrupted, the icon will automatically flash and a multi-channel alarm will be triggered.

Images