Study Of Pantograph-catenary Arc Intensity Detection Device Based On Ultraviolet Signal

With the rapid development and progress of railway industry,electrification technology has been applied in high-speed train operation.In electrified railway,the operation of electric locomotive needs to obtain electric energy through the contact between pantograph and contact wire on its top,so the contact state between pantograph and contact wire directly affects the quality of current collection and safe operation of locomotive.However,in the process of train operation,the pantograph-catenary separation is prone to generate arc.Once the arc occurs,it will bring serious impact.Therefore,it is necessary to judge the contact state of pantograph and catenary by detecting arc,so as to provide reliable guidance parameters for the design of pantograph and catenary geometric parameters and the maintenance of lines.At present,most of the common bow-and-net relationship detection methods are based on contact detection,but the detection device needs to be connected with the bow network system,which may bring hidden troubles to the train operation.In addition,the detection of the arc of the arc is basically based on the arc rate parameter,and there is very little detection of the arc intensity of the net.Therefore,this paper mainly studies this aspect.Firstly,by comparing the research status of pantograph-catenary arc detection at home and abroad,the method of characterizing pantograph-catenary arc intensity with ultraviolet radiation energy is proposed.The relationship between ultraviolet radiation energy measured by photomultiplier tube and pantograph-catenary arc intensity is deduced.Then,independent power supply,optical acquisition system,data acquisition device,wireless transmission device and monitoring interface of host computer are designed.Finally,the experimental platform is adopted.The deduction theory and detection system are verified by experiments.The main contents of the dissertation are as follows:Theoretical deduction.Firstly the mechanism and structure of arc generation are described.The harm of pantograph-catenary arc is briefly explained.Finally,according to Bohr theory and Einstein's photoquantum theory,the relationship between ultraviolet radiation energy measured by photomultiplier tube and pantograph-catenary arc intensity is deduced.The design of hardware device.First of all,GDB-152B photomultiplier is selected according to the detection range,and filters are added to eliminate the interference of sunlight.Then STM32 MCU is used as the core processor to collect the output signal of optical system.Real-time data transmission is realized by using 4G-LTE wireless module.Finally,an independent power supply is designed to realize long-term stable power supply for the detection system.The design of software platform.We compiled and processed the acquisition program of the lower computer by ?Vision5,configuring the wireless module of 4G-LTE,and designing the monitoring interface of the upper computer with VB,including data communication,graphics display and data refinement analysis.Experimental verification.The detection system is verified by experiments using spark and pantograph-catenary arc simulation platform as light source,which proves the feasibility of the system and the correctness of theoretical deduction.