Research On Calibration Platform For Pantograph Catenary ARC Detection Device

With the rapid development of electrified railways,people's expectations for faster,safer and more reliable electrified railways are also growing.In actual operation,pantograph catenary often occurs arc burning phenomenon.The arcing arc has a serious influence on the sensitive equipment of the pantograph system and the flow quality of the locomotive,so the arcing arc detection device is widely used in the on-line monitoring of the arc.The spectral responsivity is an important performance parameter of the arcing arc detection device,and it reacts the ability of the arcing arc detection device to convert the light signal into the electrical signal,and the corresponding spectral responsivity of different wavelengths is different.Therefore,it is of great significance to build a set of calibration platform in accordance with the actual bow and network arc detection device.At present,domestic and foreign scholars mainly focus on the calibration of spectral responsivity of photoelectric detectors,and few studies have been done on the calibration of pantograph catenary arc detection device.In order to accurately calibrate the pantograph catenary arc detection device,this paper designs a set of calibration platform for the pantograph catenary arc detection device based on the substitution method.The platform design includes four parts:optical system,monochromator and its control system,detector system and auxiliary system.The main function of the optical system is to simulate the radiation.The light source selects the xenon lamp with a wavelength range of 200--1100nm and power 150W.By introducing a plane reflector,a parabolic mirror and a monochromator,the monochromatic light of the wavelength range in 235--290nm is obtained.The filter plays the role of the uniform beam and the filter effectively inhibits the stray light produced by the light of the 400nm wavelength.The light splitter of the two beams is obtained by using the light splitter of the light splitting ratio of 50:50,and the light power rate of the two beams is 0.71*10^-7W,match sensitivity of detector detection signal.The accurate conversion of the standard detector,the monitoring detector and the arcing arc detection device is completed by the auxiliary equipment,such as the revolving table,the reflector rotating frame and the motion controller.The two beams of light are incident to the monitoring detector and the standard detector,the monitoring detector and the arcing arc detection device,and the two measurements are completed.In addition,the optical chopper and phase locked amplifier are introduced for the signal amplification and accurate detection in view of the weak detection signal and easy to be buried in the noise.According to the design of the calibration platform for the arcing arc detection device,a set of calibration experimental platform is set up,and the arch network arc detection device with known spectral responsiveness is used to test the output signal of the detector and the arc detection device,and the stability of the mean value deviation stability and the maximum deviation stability of the measured output signal are measured.Its less than 5%,within the allowable range of error.By using the final formula of substitution method,the spectral response degree of the arcing arc detection device in the band 235nm--290nm is calculated.Compared with the actual spectral response degree,the maximum error is 4.4%.At the same time,according to the related parameters of the uncertainty analysis method of the international combined equipment and the equipment in the calibration platform,the calibration leveling is summed up.The uncertainty of the equipment is 2.68%,which provides a reference for verifying the accuracy of the calibration platform design.