HJKIR HomePage
Project background
Pantograph catenary relationship is one of the three core relationships for the safe operation of high-speed electrified railway. The good service performance of pantograph catenary system is the basic condition to ensure the reliable and safe operation of high-speed trains.
Programme requirements
In order to realize the goal of informatization and intellectualization of railway management, we put forward the application solution of infrared thermography for intelligent detection and monitoring of railway pantograph.
The scheme adopts the network on-line infrared thermal imager installed on the electric locomotive to continuously monitor the temperature status of the key nodes of the electrical equipment of the overhead contact system when the electric locomotive is running, and records the monitoring data in the memory in real time. Through the analysis and processing of the real-time monitored target temperature data, the data report is generated to effectively locate the fault point of the electrical equipment of the overhead contact system. The actual operation shows that the abnormal temperature information output by the system can provide a strong basis for eliminating the hidden trouble of electrical equipment of overhead contact system in advance, and realize the significant improvement of electrical equipment management of overhead contact system detection from maintenance operation to state operation.
Objectives of intelligent monitoring scheme
The current mode of planned repair + fault repair is gradually changed to the mode of state repair, and big data technology is combined with intelligent image recognition and analysis technology + thermal imaging technology.
Infrared thermal imaging temperature measurement technology can collect up to 100 infrared thermal maps per second, locate and diagnose pantograph abnormalities through 24-hour real-time observation of the thermal state distribution on the pantograph surface during vehicle operation. It has the characteristics of non-stop, non-contact, fast and intuitive. It is combined with the intelligent analysis algorithm at the back end to monitor the current working state of the pantograph in real time. Through the thermal image analysis of the surface of electrical equipment, Judging and diagnosing the state of the equipment and its hidden dangers and defects, and giving an alarm in advance for potential faults and heating, plays a key and effective role in finding, handling and avoiding potential accidents in time.
Scheme product selection requirements
1. High detection efficiency: online temperature measurement and detection method is adopted, with high detection efficiency; The selected infrared thermal imager can measure temperature quickly and accurately, monitor day and night, and measure temperature safely and conveniently.
2. High degree of automation: the detection process and surveillance video are automatically executed
3. It has the functions of video acquisition, offline arcing detection, high temperature abnormal point detection, real-time acquisition of pantograph current, data analysis and alarm, and alarm interface
4. All weather detection: it can be detected regardless of rain, snow and other bad weather, and is not affected by climatic conditions; Advanced and reliable technology: the use of non-contact image measurement technology not only reflects the advanced technology, but also greatly improves the reliability of the system. The large screen display technology realizes the indoor visual observation of the condition of the pantograph roof.
Infrared application
1. Analysis of infrared application characteristics
The infrared intelligent online real-time monitoring system is a real-time monitoring and monitoring system integrating visible light, infrared thermal imaging and embedded processing technology. The system can automatically inspect, monitor, warn and obtain the thermal information of equipment fault status in real time. It integrates big data technology and intelligent image recognition and analysis technology. It has the characteristics of uninterrupted power supply, long distance, safety and reliability, and high detection accuracy, It is a very effective method to realize on-line monitoring and equipment condition maintenance.
2. Advantage analysis
1) Built in video analyzer, with recognition and calculation ability
2) High accuracy, fast and accurate temperature measurement, good uniformity, and will not cause temperature difference due to scene changes
3) The calibration temperature measurement function is applicable to fire detection, safety monitoring and equipment thermal temperature monitoring
4) A variety of alarm notification options, including email, digital output, or VMS alarm
5) It has good standardization, openness, integration, security, scalability and maintainability
6) The thermal imager can be configured through web or mobile application
7) Wide dynamic range thermal imaging for industry-leading threat detection
8) Real time online monitoring, full real-time image, image without delay
3. Application of scheme characteristics
The infrared thermal imager with online temperature measurement function can realize online monitoring + intelligent analysis.
Online monitoring
Only when there is no fault in the system, it is very important to detect the fault and take effective countermeasures to realize the pre judgment of the fault in advance. Prevention and detection has become an important means. The initial performance of power system fault is heating, and abnormal heating phenomenon is the direct performance of the fault. Through the real-time observation of the high-speed infrared thermal imager, up to 100 infrared thermal images can be collected every second. Combined with the intelligent analysis algorithm at the back end, the current working state of the pantograph can be monitored in real time, and the potential faults and heating can be alarmed in advance, so as to effectively avoid the occurrence of potential accidents. The infrared thermal imager is not affected by light, so it is more suitable to be used in the case of insufficient light such as tunnels. The infrared thermal imager can be used as a finger's paw for sparks, arcs, catenary faults, pantograph damage faults, etc. caused by poor contact between pantograph and catenary, so as to truly make the fault points and high-temperature points invisible and ensure the safe and smooth operation of the train.
4. System detection includes the following aspects
- Overhead catenary Catenary Inspection
- Wear detection of carbon slider
- Carbon slider fracture monitoring
- Pantograph component missing monitoring
- Abnormal offset monitoring (pantograph catenary relationship)
- Abnormal inclination monitoring (pantograph catenary relationship)
- Overhead catenary Catenary Inspection
5. Main reasons for overheating of catenary connectors
1) Oxidation corrosion
It has been eroded by the sun, rain, wind, dust, condensation and chemical active gases for many years.
2) Loose connector
The connecting part of the conductor is subject to mechanical vibration, shaking or swinging under the action of wind for a long time, which makes the crimping screw of the conductor loose.
Pantograph catenary monitoring
The infrared thermal imaging equipment can be installed on the roof to detect the temperature at the connection between the pantograph and the catenary, and monitor the fault point of the catenary in real time. If the fault point is found during the train, it will produce an instantaneous high temperature. The thermal imager can record the high temperature value and the location of the fault point at that time, so that the maintenance personnel can repair it in time.
Case analysis
Intelligent monitoring application
Through the 24-hour real-time observation of the infrared thermal imager, up to 100 infrared thermal images can be collected every second. Combined with the intelligent analysis algorithm at the back end, the current working state of the pantograph can be monitored in real time, and the potential faults and heating can be alarmed in advance, so as to effectively avoid the occurrence of potential accidents.
Advantage analysis of intelligent monitoring scheme
1. Automatic equipment identification management
The patented algorithm is used to automatically recognize the heat map collected with the system, and the effective equipment target of the heat map is recognized through image registration to ensure the effectiveness of temperature detection.
2. Anti false alarm identification system
The external interference heat source is automatically eliminated to effectively prevent the generation of false alarm
3. Automatic warning
Automatic alarm in case of abnormal temperature of target equipment
4. Automatically generate reports
The system can automatically record the temperature value at each temperature measurement and generate a temperature report
5. The data is comparable
The system can give the temperature change trend of all equipment in the inspection strategy at the same time every day for a period of time
6. Automatic position calibration function
Using image recognition technology, the operation error is automatically corrected to ensure that the correct temperature state of equipment components can be collected
Analysis of intelligent monitoring scheme of infrared thermography
Users can view the high-definition images of the surface of the carbon slide plate and the bow groove after passing the car through the computer terminal in the monitoring room.
The device detection data is transmitted wirelessly, and the device terminal software realizes the comprehensive management of images and other data, and supports the local enlargement of pictures and the enhancement of image quality for users to enter and confirm defects.
Infrared thermal imaging, intelligent analysis, dynamic geometric parameters of catenary: such as the height of contact wire, pull-out value, mutual position of contact wire, etc., measure the arcing times, arcing time and arcing rate of pantograph and catenary.
Principle of remote monitoring
Equipped with professional management software
AI analysis
In the era of big data, integrating efficient and fast AI solutions is the development trend of the industry, especially the application of infrared thermal imaging technology combined with deep learning analysis and intelligent sensing monitoring.
Combination of on-line monitoring system and artificial intelligence analysis
Massive data to achieve fine analysis
Prospect
At present, according to the quarterly inspection plan released by the professional technology department, the railway inspection department carries out on-line inspection on the eight lines of the whole section of the railway, intercity and ordinary railway in an encryption cycle on a quarterly basis, and carries out a comprehensive "physical examination" on the catenary contact suspension, additional suspension and other equipment of each span, realizing massive data collection and refined classification
