Infrared diagnosis of contact wire abrasion based on surface temperature method

YAN Ling-ling， JIN Li-jun， ZHANG Wen-hao， YANG Zheng-bo
（Department of Electrical Engineering， Tongji University， Shanghai 201804， China）

Abstract： In order to solve the problems of defect of contact wire abrasion，the infrared technique was investigated. After the analysis of the surface temperature of the defect，the relationship of the surface temperature and its cross-sectional area was established. A method was presented to calculate the cross-sectional area of contact wire abrasion with the temperature of the surface. The judgment of contact wire abrasion was evaluated by the index of measurement error，the temperature rises of contact wire were tested in the laboratory. The experimental results show that the maximum measurement error is less than 10%，so the method proposed is practicable.
Key words： contact wire； abrasion； infrared diagnosis； temperature rise