Abstract
According to the solar-blind characteristic of the pantograph arc spectrum distribution, an arc detection method based on the photoelectric conversion mechanism for urban rail was proposed, and the design of each part of the arcing detection system was completed. Through the analysis of arc spectral distribution, the 275-285 nm band was determined as the detection characteristic waveband. The optical acquisition system located on the roof of the train collects the arc characteristic light and transmits it to the photoelectric conversion module, which converts the received optical signal into the corresponding current signal linearly. After amplification, comparison and screening in this module, the optical signal is sent to the data processing module for output display. Finally, a field test conducted on an urban rail transit line shows that this arc detection system can effectively detect the pantograph arc phenomenon and reflect the arc intensity linearly avoiding the influence from natural light, train load and train running direction.
Highlights
The electric energy required by urban rail trains is obtained from the continuous sliding contact between the pantograph and the contact line [1]
Our team has conducted a spectrum analysis experiment of the pantograph-contact line arcing in the laboratory, and we found that there is a certain amount of the UV bands below 300 nm in the arc spectrum, among which the radiation intensity of 275-285 nm band accounted for a stable proportion in the whole arc spectrum, it could reflect the magnitude of arc intensity [22]
275-285 nm band in the arc light and convert it into current signal i(t) linearly, it explains that the output current signal i(t) of the photoelectric conversion module is proportional to the discharge Q of the arc, and the detection result of the arc detection system can correctly reflect the strength of arc
Summary
The electric energy required by urban rail trains is obtained from the continuous sliding contact between the pantograph and the contact line [1]. Finding an appropriate method to realize the real-time arcing detection can measure the quality of the relationship between pantograph and catenary system, providing the basis for urban rail transit pantograph-catenary coordination design, maintenance and insulation design work. Su: Pantograph Arc Detection of Urban Rail Based on Photoelectric Conversion Mechanism arc detection on time series in pantograph-catenary system [16], but the image processing method could not distinguish whether the light points in the images from arcs or other light sources. The spectral characteristics of pantograph arc and the feasibility of using solar blind method in the arc detection system are analyzed in the section of ‘‘Principle of pantograph arc detection’’, and the relationship between the PMT output photocurrent and arc intensity in the photoelectric conversion process is deduced. The experimental results and analysis are given in the section of ‘‘Results and discussion’’, and the conclusion is given at the end
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