Design And Implementation Of Infrared Thermal Imaging Monitoring System Based On MFC

According to statistics,about 90% of faults in power system are caused by equipment faults,and about half of equipment faults are caused by early abnormal thermal behavior.Researchers show that the staff can detect many fault sources in the equipment based on the heat of the components,such as oxidation and component connection fault,so the temperature measurement method can be used to monitor the electrical equipment.The traditional off-line temperature measurement methods mainly include visual method,temperature indicating wax method,color changing temperature indicating paint method,infrared thermometer method and so on.These detection methods can no longer meet the requirements of high efficiency of power production,safe and reliable power operation.The thesis starts from studying the limitations of the current infrared thermal imaging monitoring system,using online thermal imaging cameras as the core equipment,using switches,PCs,etc.to form a hardware system,C++ as the development language,and MFC as the Windows desktop application development framework.It designs an infrared thermal imaging monitoring system software that can work in Windows system and realizes the dual-threaded processing function of equipment real-time monitoring and online image acquisition.The main contents of this thesis are as follows.(1)The current domestic and international status quo of the infrared thermal imaging monitoring system used in power equipment is investigated,and the current deficiencies of systems and the desired design system improvement direction are summarized.Considering users demand and functional demand,the basic requirements of infrared thermal imaging monitoring system and its software design are proposed based on the system price,the number of thermography cameras,lenses,pixel,temperature accuracy,working environment and software design requirements.In addition,the basic laws of infrared radiation,infrared imaging principles,infrared image diagnosis methods and the influencing factors of infrared thermal imaging diagnosis are studied,which lay the theoretical foundation and technical support for the subsequent development of the system.(2)The online thermography cameras in the current market was investigated,and the price of the thermal imaging camera and the working environment were considered as the main considerations.Finally,the AX8 thermography camera produced by FLIR was selected.Among them,two FLIR AX8 thermography cameras are selected as the front-end monitoring and acquisition subsystem,a personal computer with Windows system is selected as the server platform subsystem,an Ethernet cable and network cable are selected as the network transmission system,and the hardware framework of the infrared thermal imaging monitoring system is designed and built.In addition,the system uses the RTSP protocol as the data transmission protocol,adopts the MFCbased software development framework and modular development methods,and calls the third-party libraries VLC and Open CV libraries to complete the design of the supporting infrared thermal imaging monitoring system software.(3)A method of infrared image mosaic based on visible light characteristics(MSX)is proposed,which solves the limitation that large-scale electrical equipment or multiple devices cannot be fully detected with one thermography camera.The edge detection algorithm based on Canny and the threshold segmentation based on Otus are proposed,which lay the foundation for the subsequent staff to identify equipment faults.Among them,the monitoring system integrates the above three image processing algorithms into the software,uses the MSX infrared images collected in the laboratory for testing and analysis,and achieves good experimental results.(4)The designed infrared thermal imaging monitoring system is tested to monitor the temperature of the outer sheath of the main circuit in the thermal cycling voltage test of the cable bushing terminal in the 220 k V high voltage test hall of long cable electrician.Using 15 sets of collected data for polynomial fitting,it is concluded that the temperature gradually increases with time.Using the MSX image collected by the thermography cameras to unify the temperature range,it is concluded that the brightness of the image gradually increases with time.Using the image mosaic,edge processing and threshold segmentation algorithms integrated in the software to process the collected thermal images,which obtains the expected experimental results.In the thesis,two thermography cameras are used as the core,and an infrared thermal imaging monitoring system based on MFC is designed.The designed system architecture is reasonable,the supporting software has complete functions and friendly interface,which has certain commercial value.The working principle of infrared thermal imaging monitoring system is as follows.Firstly,two infrared thermal imagers are used to monitor the target equipment.Then the collected data is transmitted to the console through Ethernet cable and network cable using RTSP transmission protocol.Finally,the staff control thermography cameras by using the software installed on the PC,and realize dual-thread processing of the image.Among them,the infrared thermal imaging monitoring system uses image processing and computer vision technology to realize the function of monitoring the status of power equipment in the substation.Using the saved images and videos,it realizes the collection and analysis of the monitored power equipment information.