Cable partial discharge and temperature measurement two-in-one fusion device

Abstract

The invention discloses a cable partial discharge and temperature measurement two-in-one fusion device, and belongs to the technical field of cable monitoring. In order to solve the problems that a traditional cable partial discharge detection device and a traditional cable temperature measurement device are mutually independent and single in function, a high-frequency current transformer of an HFCT and an RFID acquisition antenna are creatively fused. The HFCT can sensitively capture high-frequency current change caused by partial discharge of the cable to realize partial discharge detection; and the RFID acquisition antenna can efficiently receive the temperature data of the RF ID temperature sensor at the cable joint, thereby achieving a temperature measurement function. The signal conditioning circuit pre-processes signals collected by the two parts, optimizes signal quality, and then transmits processed partial discharge and temperature data to a monitoring center in real time through the communication module, so that a worker can remotely, synchronously and accurately master the operation state of the cable, the integration level and efficiency of cable monitoring are remarkably improved, and the working efficiency is improved. And a foundation is built for reliable operation of an electric power system.

Description

Technical Field

[0001] The present invention belongs to the technical field of power cable monitoring, and in particular relates to a two-in-one fusion device capable of simultaneously realizing cable partial discharge detection and temperature measurement. Background Art

[0002] In power transmission systems, the safe operation of cables is of vital importance. Cable partial discharge is an important manifestation of insulation degradation, which may lead to cable failure and affect the reliability of power supply. There are various traditional means of cable partial discharge detection, among which HFCT (high frequency current transformer) has attracted widespread attention for its high sensitivity and ability to effectively capture high-frequency current signals generated by partial discharge. It can convert the weak partial discharge current changes in the cable into electrical signals, providing basic data for subsequent analysis and processing, thereby realizing the monitoring of cable partial discharge conditions.

[0003] At the same time, during the operation of the cable, heat is easily accumulated at the connection due to factors such as contact resistance. Excessive temperature will accelerate insulation aging, which will lead to potential failures. RFID (radio frequency identification) temperature measurement technology provides a convenient way to monitor cable temperature. By installing RFID temperature sensors at the cable connection, temperature data is transmitted using radio frequency signals to achieve real-time measurement of the temperature of key parts.

[0004] However, most of the current cable partial discharge detection devices and temperature measurement devices are independent of each other, which not only increases the equipment cost, installation space and maintenance workload, but also makes it difficult to conduct a comprehensive analysis of partial discharge data and temperature data, and it is impossible to comprehensively and efficiently evaluate the operating status of the cable. The specific problems are as follows:

[0005] First, traditional cable partial discharge detection devices and temperature measuring devices are independent of each other, resulting in numerous equipment, complex installation and high costs; second, independent monitoring devices find it difficult to conduct comprehensive analysis of cable partial discharge data and temperature data, and are unable to fully evaluate the cable operating status; third, previous monitoring equipment has deficiencies in power management and anti-electromagnetic interference.

[0006] Therefore, the development of a fusion device that integrates partial discharge detection and temperature measurement functions has become an urgent need in the field of cable monitoring, which is of great significance for improving the safety and stability of the power system. Summary of the invention

[0007] In order to solve the defects and shortcomings in the above-mentioned prior art, the present invention provides a two-in-one fusion device for partial discharge and temperature measurement of cables, which integrates the high-frequency current transformer of HFCT with the RFID acquisition antenna, effectively reduces the equipment cost and installation space requirements, and solves the problem of low system integration; utilizes the coordinated processing of the two types of data by the microprocessor to accurately judge the health status of the cable, timely discover potential fault hazards, and overcome the defects of isolated data analysis; adopts an intelligent power management module and effective electromagnetic interference protection measures to enhance the stability and reliability of the device in a complex power environment, improve the overall monitoring efficiency, and provide a more powerful guarantee for the safe operation of the cable.

[0008] The present invention is implemented by the following technical solutions: a cable partial discharge temperature measurement two-in-one fusion device, which adopts multi-parameter synchronous perception and fusion processing, deeply integrates HFCT partial discharge detection technology and RFID temperature measurement technology, and realizes synchronous and real-time monitoring of cable partial discharge and temperature;

[0009] An intelligent fault correlation diagnosis model is used to conduct joint analysis of the PD signal characteristic parameters and temperature data simultaneously acquired by the microprocessor unit;

[0010] Adopt adaptive alarm and operation and maintenance strategy optimization, and have adaptive alarm mechanism according to the results of functional collaborative analysis;

[0011] The fusion device specifically includes an integrated sensing component, a signal modulation circuit and a communication module that cooperate with the sensing component. The sensing component integrates an HFCT high-frequency current transformer and an RFID collection antenna. The induction magnetic ring of the HFCT high-frequency current transformer is made of a high magnetic permeability material and tightly surrounds the cable to sense the high-frequency current signal generated by partial discharge. The RFID collection antenna adopts an anti-metal microstrip structure in the UHFRFID frequency band and stably interacts with the RFID temperature sensor at the cable connection for radio frequency electromagnetic waves.

[0012] This design can accurately and synchronously obtain partial discharge and temperature signals without affecting cable operation, effectively solving the inconvenience of traditional discrete monitoring equipment, improving monitoring efficiency and accuracy, and reducing costs and installation space.

[0013] Preferably, the signal modulation circuit comprises a partial discharge signal modulation unit and an RFID temperature signal modulation unit. The partial discharge signal modulation unit performs low-noise amplification and specific frequency band filtering on the HFCT output signal to enhance the signal strength and remove interference. The RFID temperature signal modulation unit amplifies and demodulates the signal received by the RFID antenna and converts it into a usable temperature and ID data signal.

[0014] The rational design of the two units ensures high-quality signal transmission, enabling subsequent analysis and processing to be based on accurate data, improving the reliability of the entire device for cable status monitoring and reducing the risk of misjudgment due to poor signals.

[0015] Preferably, the communication module has multiple communication modes including wired Ethernet, RS485 and wireless Wi-Fi, Bluetooth, 4G / 5G, and the communication module can automatically select the optimal communication mode according to the actual environment and needs, and transmit the processed partial discharge and temperature data to the remote monitoring center or host computer in real time. At the same time, the communication module adopts encryption technology to ensure data security and prevent theft or tampering during transmission.

[0016] This design enables workers to remotely monitor cable conditions in real time, achieve efficient remote operation and maintenance management, and enhance the safety and intelligence level of the power system.

[0017] Preferably, the fusion structure of the HFCT high-frequency current transformer and the RFID collection antenna is highly integrated, the inner layer is the high-frequency current transformer, which senses the high-frequency current generated by partial discharge; the outer layer is the RFID anti-metal microstrip antenna.

[0018] While ensuring the performance of both, this design improves the integration of the device, enabling it to work stably in complex electromagnetic environments, ensuring the accuracy and reliability of monitoring data, reducing monitoring errors caused by external interference, extending the service life of the device, reducing maintenance costs, and improving its applicability in various power scenarios.

[0019] Preferably, the RFID temperature sensor adopts high temperature resistant and corrosion resistant packaging materials, is tightly fitted or embedded in the cable connection, and has high-precision temperature measurement performance and low power consumption characteristics; the RFID temperature sensor matches the communication frequency and coding of the RFID acquisition antenna, can quickly and accurately sense temperature changes and stably transmit data.

[0020] This design ensures the accuracy and timeliness of temperature monitoring, adapts to the harsh environment of cable connections, reduces potential risks caused by temperature sensor failure or inaccurate data, and provides solid protection for cable temperature monitoring.

[0021] Preferably, the partial discharge signal modulation unit and the temperature signal modulation unit adopt a modular design to facilitate installation, debugging and maintenance. The circuit parameters of the two modules can be flexibly adjusted to adapt to the monitoring requirements of different cables. The temperature signal modulation circuit has a self-test function and can automatically detect the working status. Once a fault or abnormality is found, an alarm will be immediately issued.

[0022] This design improves the versatility and maintainability of the device, ensures the stability of signal modulation, reduces the probability of monitoring failure due to circuit problems, and ensures long-term reliable operation of the device.

[0023] Preferably, a customized efficient communication protocol is adopted between the communication module and the remote device, which has data verification, retransmission mechanism and multi-device connection function, and can communicate with multiple fusion devices at the same time to realize centralized monitoring and management. The communication module monitors the communication status in real time and feeds back parameters to facilitate timely adjustment of communication settings.

[0024] The protocol and functional design ensure efficient, stable and reliable data transmission, improve the intelligence level of multi-cable monitoring of the power system, reduce data loss or delay caused by communication problems, and improve operation and maintenance efficiency.

[0025] Preferably, the shell of the fusion device is made of fireproof, waterproof and dustproof materials, is ergonomically designed and has good heat dissipation. Indicator lights and operation buttons are provided on the shell. The indicator lights display the power, communication and monitoring status, and the operation buttons are used for basic operations and parameter settings.

[0026] This design enhances the protection, usability and maintainability of the device, enabling it to adapt to complex construction sites and operating environments, facilitating on-site operation and maintenance by staff, reducing the risk of equipment damage due to environmental factors and operating inconveniences, and ensuring long-term stable operation.

[0027] Preferably, when monitoring the cable, the fusion device can automatically collect transmission data at preset intervals and also supports manual triggering function. The fusion device has local data storage capability, and the stored data will not be lost in the event of a communication failure, and will be automatically uploaded after recovery. The fusion device also has data analysis and early warning functions, and can judge the cable status based on preset thresholds and algorithms, and emit sound and light alarms in the event of an abnormality and send detailed information remotely.

[0028] This design ensures the integrity and continuity of data, provides early warning of cable failures, reduces power outage losses and maintenance costs, and improves the safety and reliability of the power system.

[0029] The present invention has the following technical effects: Unique functional collaborative innovation greatly improves the efficiency and accuracy of cable monitoring, which is specifically reflected in the following key aspects:

[0030] 1. Multi-parameter synchronous perception and fusion processing: Innovatively integrate HFCT partial discharge detection technology and RFID temperature measurement technology to achieve synchronous and real-time monitoring of cable partial discharge and temperature. Through the integrated sensing design, the temporal and spatial consistency of the two data collections is ensured, avoiding data deviation and time difference caused by independent monitoring, and providing a solid foundation for subsequent accurate analysis;

[0031] 2. Intelligent fault correlation diagnosis model: The microprocessor unit has built-in advanced intelligent algorithms, which can jointly analyze the characteristic parameters of partial discharge signals (such as discharge amplitude, phase, frequency, etc.) and temperature data obtained simultaneously. Based on a large amount of experimental data and machine learning technology, a unique fault correlation diagnosis model is constructed. It no longer views partial discharge or temperature anomalies in isolation, but accurately judges the potential fault type, location and severity of the cable from the relationship between the two, effectively improving the accuracy and reliability of fault diagnosis, and greatly shortening the time for fault location and troubleshooting;

[0032] 3. Adaptive alarm and operation and maintenance strategy optimization: According to the results of functional collaborative analysis, the device has an adaptive alarm mechanism. When the abnormal change trend of partial discharge and temperature is detected to be consistent with the preset fault mode, it can issue accurate alarm information in time, and automatically recommend optimized operation and maintenance strategies to operation and maintenance personnel based on the fault diagnosis results, such as reasonably arranging power outage maintenance time, and targeted inspection of cable connection parts, etc., realizing the transformation from passive monitoring to active operation and maintenance, significantly improving the safety and stability of the power system, and reducing operation and maintenance costs and power outage losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an overall schematic diagram of the present invention;

[0034] Figure 2 It is a schematic diagram of the high frequency current transformer and RFID antenna two-in-one sensing probe acquisition end of the present invention;

[0035] Figure 3 It is a schematic diagram of the framework of the main control module in the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0037] like Figure 1 As shown, a cable partial discharge temperature measurement two-in-one fusion device includes a partial discharge temperature measurement fusion device host (including a main control module), a high-frequency current transformer and an RFID antenna two-in-one sensing probe, an industrial frequency phase transformer, and an RFID temperature sensor. The high-frequency current transformer and the RFID antenna two-in-one sensing probe are installed on the ground wire of the cable joint, the industrial frequency phase transformer is installed on the cable, the RFID temperature sensor is installed at the cable joint, and the partial discharge temperature measurement fusion device host is installed near the cable, and the collected partial discharge and temperature signals are transmitted by wired or wireless means.

[0038] The detection of partial discharge by high-frequency current transformer (HFCT) is mainly carried out by clamping the HFCT sensor on the ground wire of the device being tested. When partial discharge occurs inside the device, a high-frequency pulse current signal is generated. These signals are transmitted through the ground wire, and the HFCT sensor can couple to the high-frequency signal. The sensor converts the sensed current signal into a voltage signal and then transmits it to the detection instrument. The detection instrument amplifies and filters the signal, removes interference noise, extracts the partial discharge characteristic signal, and determines whether the equipment has partial discharge and its severity by analyzing the signal's amplitude, frequency, phase and other parameters.

[0039] RFID wireless temperature measurement technology, namely radio frequency identification wireless temperature measurement technology, is a wireless temperature measurement method based on radio frequency signal propagation. It transmits wireless signals through the transmitter and communicates with the receiver to achieve remote, non-contact measurement of temperature. The core of RFID wireless temperature measurement technology is the RFID chip, which converts temperature information into electrical signals and sends temperature data to the reader through wireless communication technology. The reader then transmits the data to the computer for processing and analysis.

[0040] like Figure 2 As shown in the figure, the high-frequency current transformer is mainly composed of a magnetic core (made of magnetic conductive material), windings (primary and secondary), insulating materials and a metal shell. The RFID antenna adopts the form of an anti-metal microstrip antenna PCB, which is compounded on the outside of the metal shell of the transformer, and the two structures are fused through insulating materials. The power divider is used to divide the signal into two, and the induced current signal and the RFID radio frequency signal can be simultaneously transmitted to the host of the partial discharge temperature measurement fusion device through the coaxial radio frequency connecting line.

[0041] like Figure 3 As shown, the main control module includes a multi-channel processing unit, a partial discharge detection circuit, an RFID transceiver circuit, an acquisition processing unit, a power supply module and a communication unit. The partial discharge detection circuit converts the induced current into a digital signal for analysis, and the strength of the digital signal obtained by the analysis is the signal size generated by the partial discharge. The RFID transceiver circuit can realize the RFID tag data acquisition and analysis of the 18000-6C protocol, and finally parse the temperature information in the RFID tag. The acquisition processing unit is the MCU control unit, which realizes the central processor function of the monitoring fusion device and realizes the functions of data storage, filtering, and sending. The power supply module monitors the voltage supply of the fusion device, realizes the DC9-36V DC power supply, and the AC220V AC power supply. The communication unit monitors the 485 and lora transmission functions of the fusion device, realizes the upward transmission of data, and completes the system-level wired or wireless data docking.

[0042] In order to solve the problem that traditional cable partial discharge detection and temperature measurement devices are independent of each other and have single functions, the present invention innovatively integrates the high-frequency current transformer of HFCT and the RFID acquisition antenna. HFCT can keenly capture the high-frequency current changes caused by partial discharge of the cable to realize partial discharge detection; the RFID acquisition antenna can efficiently receive the temperature data of the RFID temperature sensor at the cable connection to achieve the temperature measurement function. The signal conditioning circuit pre-processes the signals collected by both to optimize the signal quality, and then transmits the processed partial discharge and temperature data to the monitoring center in real time through the communication module, so that the staff can remotely, synchronously and accurately grasp the operating status of the cable, significantly improve the integration and efficiency of cable monitoring, and lay a solid foundation for the reliable operation of the power system, which is of great value for promotion and application.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-in-one cable partial discharge temperature measurement device, characterized in that: The fusion device uses multi-parameter synchronous perception and fusion processing, deeply integrating HFCT partial discharge detection technology with RFID temperature measurement technology, and realizes synchronous and real-time monitoring of cable partial discharge and temperature; An intelligent fault correlation diagnosis model is used to conduct joint analysis of the PD signal characteristic parameters and temperature data simultaneously acquired by the microprocessor unit; Adopt adaptive alarm and operation and maintenance strategy optimization, and have adaptive alarm mechanism according to the results of functional collaborative analysis; The fusion device specifically includes an integrated sensing component, a signal modulation circuit that matches the sensing component, a communication module, and an intelligent power management module. The sensing component integrates an HFCT high-frequency current transformer and an RFID acquisition antenna. The induction magnetic ring of the HFCT high-frequency current transformer is made of a high magnetic permeability material and tightly surrounds the cable to sense the high-frequency current signal generated by partial discharge. The RFID acquisition antenna adopts an anti-metal microstrip structure in the UHFRFID frequency band and stably interacts with the RFID temperature sensor at the cable connection for radio frequency electromagnetic waves.

2. According to claim 1, a cable partial discharge temperature measurement two-in-one fusion device is characterized by: The signal modulation circuit includes a partial discharge signal modulation unit and an RFID temperature signal modulation unit. The partial discharge signal modulation unit performs low-noise amplification and specific frequency band filtering on the HFCT output signal to enhance the signal strength and remove interference. The RFID temperature signal modulation unit amplifies and demodulates the signal received by the RFID antenna and converts it into a usable temperature and ID data signal.

3. According to claim 1, a cable partial discharge temperature measurement two-in-one fusion device is characterized by: The communication module has multiple communication modes including wired Ethernet, RS485 and wireless Wi-Fi, Bluetooth, 4G / 5G, and the communication module can automatically select the optimal communication mode according to the actual environment and needs, and transmit the processed partial discharge and temperature data to the remote monitoring center or host computer in real time. At the same time, the communication module uses encryption technology to ensure data security to prevent theft or tampering during transmission.

4. According to claim 1, a cable partial discharge temperature measurement two-in-one fusion device is characterized by: The fusion structure of the HFCT high-frequency current transformer and the RFID collection antenna is highly integrated. The inner layer is the high-frequency current transformer, which senses the high-frequency current generated by partial discharge; the outer layer is the RFID anti-metal microstrip antenna.

5. According to claim 1, a cable partial discharge temperature measurement two-in-one fusion device is characterized by: The RFID temperature sensor adopts high temperature resistant and corrosion resistant packaging materials, is tightly fitted or embedded in the cable connection, and has high-precision temperature measurement performance and low power consumption characteristics; the RFID temperature sensor matches the communication frequency and coding of the RFID acquisition antenna, can quickly and accurately sense temperature changes and stably transmit data.

6. A cable partial discharge temperature measurement two-in-one fusion device according to claim 2, characterized in that: The partial discharge signal modulation unit and the temperature signal modulation unit adopt a modular design, which is easy to install, debug and maintain. The circuit parameters of the two modules can be flexibly adjusted to adapt to the monitoring requirements of different cables. The temperature signal modulation circuit has a self-test function and can automatically detect the working status. Once a fault or abnormality is found, an alarm will be immediately issued.

7. The cable partial discharge temperature measurement two-in-one fusion device according to claim 1 is characterized by: The communication module uses a customized efficient communication protocol with the remote device, has data verification, retransmission mechanism and multi-device connection function, can communicate with multiple fusion devices at the same time, realize centralized monitoring and management, and the communication module monitors the communication status in real time and feeds back parameters to facilitate timely adjustment of communication settings.

8. The cable partial discharge temperature measurement two-in-one fusion device according to claim 1, characterized in that: The shell of the fusion device is made of fireproof, waterproof and dustproof materials. It is ergonomically designed and has good heat dissipation. Indicator lights and operation buttons are provided on the shell. The indicator lights display the power, communication and monitoring status, and the operation buttons are used for basic operations and parameter settings.

9. The cable partial discharge temperature measurement two-in-one fusion device according to claim 1, characterized in that: When monitoring the cable, the fusion device can automatically collect transmission data at preset intervals and also supports manual triggering. The fusion device has local data storage capabilities. In the event of a communication failure, the stored data will not be lost and will be automatically uploaded after recovery.

10. The cable partial discharge temperature measurement two-in-one fusion device according to claim 1, characterized in that: The fusion device also has data analysis and early warning functions. It can judge the cable status based on preset thresholds and algorithms, issue sound and light alarms when abnormalities occur, and send detailed information remotely.

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