High-voltage power cable lead seal temperature real-time monitoring system and method

Abstract

The invention discloses a cable lead seal temperature real-time monitoring system and method, and belongs to the technical field of power equipment monitoring. The system comprises a temperature sensing probe, a multi-point temperature measurement concentrator and a monitoring platform, the temperature sensing probe collects cable lead seal temperature data, the multi-point temperature measurement concentrator transmits the data in a networking mode, and the monitoring platform processes and displays the data in real time and sets a threshold value to achieve warning. The method comprises the steps of data acquisition, transmission, processing, alarm judgment and the like. According to the invention, the problems of low efficiency, poor precision, position drift after restart, high detection cost and insufficient real-time performance of a traditional temperature measurement method are solved, efficient, accurate and real-time monitoring and early warning of the cable lead seal temperature are realized, and a powerful guarantee is provided for safe operation of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment monitoring, and in particular to a cable seal temperature real-time monitoring system and method. Background Art

[0002] In power systems, high-voltage power cables are crucial infrastructure for power transmission. However, the complex environment within cable tunnels and shafts presents challenges such as confined space, high humidity, and complex cable layouts. The sealed areas of power cables are prone to overheating due to abnormal contact resistance, leading to safety incidents such as fires.

[0003] Traditional cable temperature measurement methods rely primarily on regular manual inspections, using tools like thermometers to measure point-by-point. This method has significant drawbacks: manual inspections are inefficient and time-consuming; comprehensive and accurate measurements are difficult to ensure, making it easy to miss potential issues; and long inspection intervals prevent real-time monitoring of temperature changes in the three-phase seals of the power cables A, B, and C, hindering timely warning of safety hazards. Fiber optic temperature measurement is inherently resistant to electromagnetic interference, but its connectors are susceptible to moisture, and temperature drift over long installations requires regular calibration. Initial equipment and installation costs (fiber optics, demodulators, etc.) are high, and long-term maintenance relies on specialized teams. This overall cost is high, making large-scale installation unsuitable. With the development of intelligent power systems, there is an urgent need for an efficient, accurate, real-time, affordable, and easy-to-maintain cable seal temperature measurement system and method to comprehensively monitor cable seal temperatures and provide timely warnings. Summary of the Invention

[0004] Purpose of the Invention

[0005] A real-time temperature monitoring system and method for the three-phase lead seals of cables A, B, and C are provided to solve the problems of low efficiency, poor accuracy, and insufficient real-time performance of traditional temperature measurement methods, and to achieve efficient, accurate, and real-time monitoring and early warning of cable lead seal temperatures.

[0006] Technical Solution

[0007] A cable seal temperature real-time monitoring system, comprising:

[0008] Temperature probes: These include digital and analog probes, used to collect temperature data from cable seals. The digital probe measures temperatures from -40°C to +125°C, with a resolution of 0.1°C and an accuracy of ±0.5°C. The analog probe measures temperatures from -40°C to +300°C, with a resolution of 0.5°C and an accuracy of ±1.0°C. Each probe has a unique ID for easy identification and binding.

[0009] Multi-point temperature measurement concentrator: Connects to temperature sensors and supports up to 38 temperature measurement nodes (30 digital temperature sensors + 8 analog temperature sensors). It uses RS485 communication and Modbus-RTU industrial control bus protocol for data transmission. Each module can expand the number of temperature measurement nodes via RS485 networking, supporting a maximum of 254 nodes (254 x 38 = 9652 nodes). It features a compact size (L x W x D: 107 mm x 57.5 mm x 37 mm) and strong environmental adaptability. It can monitor the temperature, fault, and offline status of each analog and digital sensor.

[0010] Monitoring Platform: Communicates with multi-point temperature measurement concentrators to receive, process, and display temperature data. High and low temperature alarm thresholds can be set (e.g., 80°C for high and -20°C for low), and real-time information such as device temperature and sensor status can be displayed. Alarms are issued when the temperature exceeds the threshold or when a temperature anomaly occurs. These alarms can be sent via the interface, SMS, email, and other means. Alarm details are also recorded, including the device name, alarm type, sensor, temperature value, and alarm time.

[0011] A method for real-time monitoring of cable seal temperature based on the above system comprises the following steps:

[0012] Data acquisition: The temperature sensor collects the temperature data of the cable seal in real time. The digital probe and analog probe convert the temperature signal into digital signal and analog signal respectively.

[0013] Data transmission: The temperature sensor transmits the collected data to the multi-point temperature measurement concentrator, which transmits the data to the monitoring platform via RS485 communication based on the Modbus-RTU protocol.

[0014] Data processing and display: The monitoring platform processes the received data and displays in real time the temperature values of the three-phase lead seals of cables A, B, and C, equipment status, number of sensors, average temperature, maximum temperature, minimum temperature and other information, and performs data storage and statistical analysis.

[0015] Alarm Assessment and Processing: The monitoring platform evaluates temperature data in real time based on preset alarm thresholds. When the temperature at a sealing point exceeds 90°C or falls below the low-temperature threshold, or when the temperature difference between adjacent sensors exceeds the set value, the alarm mechanism is triggered, an alarm signal is issued, and the alarm details are recorded, notifying maintenance personnel to take timely action. When the temperature difference between the sealing points of cables A, B, and C exceeds 5°C, the alarm mechanism is triggered, an alarm signal is issued, the alarm details are recorded, and maintenance personnel are notified to take timely action.

[0016] Beneficial effects

[0017] Efficient and accurate: The temperature of the cable seal area is collected in real time through the temperature sensing probe. The digital probe and analog probe meet different temperature ranges and accuracy requirements respectively, ensuring the accuracy and comprehensiveness of the measurement data.

[0018] Real-time monitoring and early warning: The monitoring platform receives and processes data in real time, can quickly detect temperature anomalies and issue alarms, overcoming the defects of traditional manual inspections with long intervals and inability to issue early warnings, and providing strong guarantees for the safe operation of cables.

[0019] Flexible networking: The multi-point temperature measurement concentrator supports large-scale networking. The number and location of temperature sensors can be flexibly configured according to the actual layout and monitoring needs of cable tunnels and cable wells, adapting to complex environments such as cable tunnels and cable wells.

[0020] Easy maintenance: Each probe has a unique ID for easy identification and binding, and the concentrator can obtain the probe status, making it easier for operation and maintenance personnel to manage and maintain the equipment, thereby improving the reliability and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : Schematic diagram of the system architecture of the present invention.

[0022] Figure 2 : Schematic diagram of the multi-point temperature measurement concentrator structure.

[0023] Figure 3 : Schematic diagram of the layout of temperature sensors at the lead seals of the three phases of cables A, B and C.

[0024] Figure 4 :Schematic diagram of the monitoring platform interface. DETAILED DESCRIPTION

[0025] System Installation

[0026] Based on the distribution of the A, B, and C three-phase seals within cable tunnels and cable wells, temperature probes are installed at each seal location. Digital probes are used for seals with a temperature range of -40°C to +125°C, while analog probes are used for seals with potentially higher temperatures (-40°C to +300°C). The temperature probes are connected to a multi-point temperature measurement concentrator via cables. The concentrator is installed in a location that is convenient for wiring and communication.

[0027] Multiple multi-point temperature measurement concentrators are networked through the RS485 bus and connected to the switch, and then the data is transmitted to the monitoring platform through the network to achieve centralized monitoring of the entire cable seal temperature.

[0028] Platform Settings

[0029] Set the basic information of each device and sensor on the monitoring platform, including cable name, phase, seal position, etc., and bind the unique ID of the temperature probe.

[0030] According to the safety requirements of cable operation, set the high temperature alarm threshold to 90°C and the low temperature alarm threshold to -20°C. At the same time, set a reasonable temperature difference alarm threshold (such as 5°C).

[0031] Monitoring and Alarm

[0032] Once the system is operational, temperature sensors collect seal temperature data in real time, transmitting it to the monitoring platform via a multi-point temperature measurement concentrator. The platform displays the temperature of each seal location in real time, such as 26.25°C for "220kV Chuanshu Line - Phase A Lead Seal Left End - 1."

[0033] When the temperature of a seal point reaches or exceeds 90°C, such as 81.81°C at the left end of the C-phase seal (4) (exceeding the preset high temperature threshold), the platform immediately issues a high-temperature alarm, displays the alarm information on the interface, and notifies operations and maintenance personnel via SMS or email. Alarm details are also recorded, including the alarm time, device name, sensor, and temperature value.

[0034] When the temperature difference between adjacent sensors exceeds the set value (such as 5.09°C), the platform triggers a temperature difference alarm, alerting operation and maintenance personnel to possible abnormal conditions so that they can be checked and handled in a timely manner.

[0035] In summary, the cable seal temperature real-time monitoring system and method provided by the present invention can monitor the cable seal temperature efficiently, accurately and in real time, promptly discover potential safety hazards, and provide reliable technical support for the safe operation of the cable.

Claims

1. A cable seal temperature real-time monitoring system, characterized in that: include: Temperature sensors, including digital and analog probes, are used to collect temperature data from the lead seals of cables A, B, and C. The digital probe measures temperatures in the range of -40°C to +125°C, with a resolution of 0.1°C and an accuracy of ±0.5°C. The analog probe measures temperatures in the range of -40°C to +300°C, with a resolution of 0.5°C and an accuracy of ±1.0°C. Each probe has a unique ID. The multi-point temperature measurement concentrator is connected to the temperature sensor and supports temperature measurement of up to 38 nodes, including 30 digital temperature measurement probes and 8 analog temperature measurement probes. It adopts RS485 communication mode and performs data transmission based on the Modbus-RTU industrial control bus protocol. The temperature measurement nodes can be expanded through RS485 networking, supporting a maximum of 254 nodes. The monitoring platform is connected to the multi-point temperature measurement concentrator for receiving, processing and displaying temperature data, setting high and low temperature alarm thresholds, and issuing an alarm signal when the temperature exceeds the threshold or a temperature abnormality occurs, and recording the alarm details.

2. The cable seal temperature real-time monitoring system according to claim 1, characterized in that: The multi-point temperature measurement concentrator has a volume of 107mm long × 57.5mm wide × 37mm thick and can obtain the temperature, fault and disconnection status of each digital and analog probe.

3. The real-time temperature monitoring system for three-phase lead seals of cables A, B, and C according to claim 1 is characterized in that: The monitoring platform supports sending alarm signals through various methods such as interface display, text message, email, etc. The alarm details include device name, alarm type, sensor, temperature value, and alarm time.

4. A method for real-time monitoring of the lead seal temperature of three phases of cables A, B, and C based on the system according to any one of claims 1 to 3, characterized in that: The following steps are involved: Data acquisition: The temperature sensor collects the temperature data of the cable seal in real time, and the digital probe and analog probe convert the temperature signal into digital signal and analog signal respectively; Data transmission: The temperature sensor transmits the collected data to the multi-point temperature measurement concentrator, which transmits the data to the monitoring platform via RS485 communication based on the Modbus-RTU protocol; Data processing and display: The monitoring platform processes the received data and displays the temperature value of each cable seal part, equipment status, number of sensors, average temperature, maximum temperature, minimum temperature and other information in real time, and performs data storage and statistical analysis; Alarm judgment and processing: The monitoring platform makes real-time judgments on temperature data based on the preset alarm threshold. When the temperature exceeds the threshold or an abnormal temperature difference occurs, the alarm mechanism is triggered, an alarm signal is issued, and the alarm details are recorded to notify the operation and maintenance personnel to take timely measures. When the temperature difference between the three-phase lead sealing points of cables A, B, and C is greater than 5°C, the alarm mechanism is triggered, an alarm signal is issued, and the alarm details are recorded to notify the operation and maintenance personnel to take timely measures.

5. The cable seal temperature real-time monitoring method according to claim 4, characterized in that: The alarm threshold includes a high temperature threshold and a low temperature threshold, wherein the high temperature threshold is set to be greater than 90° C., and the low temperature threshold is set according to the cable operation requirements.

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