基于PMT电压一次积分值的城轨弓网电弧检测系统

Arcing Detection System for Pantograph-catenary System of Urban Rail Transit Based on Voltage Integral Value of PMT

为了能有效地检测出城市轨道交通列车运行中发生的弓网燃弧现象,设计了一种基于弧光中紫外波段日盲特性的城轨弓网电弧检测系统。首先,确定275~285 nm波段作为弧光日盲紫外检测法弓网电弧检测的特征光波段;其次,通过对光电倍增管(Photomultiplier tube,PMT)等效电路的分析,确定其阳极输出电压的一次积分值作为衡量弓网电弧强弱的特征量;最后按要求对系统各部分结构及主要参数进行了设计。该系统在兰州市轨道交通1号线进行了电弧检测试验,试验结果表明:该燃弧检测系统能够有效检测出燃弧现象、线性反应电弧的强弱,且不受自然光及列车运行方向的影响。

In order to effectively detect the arcing of pantograph-catenary system in urban rail transit, an arcing detection system based on the solar-blind feature of ultraviolet in arcing light spectrum was proposed in this paper. Firstly, the 275~285 nm band was used as the characteristic waveband of arcing detection system. Secondly, based on the analysis of the equivalent circuit of PMT(Photomultiplier tube), the first integral value of output voltage from its anode was determined as the characteristic value to measure the intensity of pantograph-catenary arcing. Finally, the structure and main parameters of the system were designed according to the requirements. Arc detection tests on the system were carried out in Lanzhou Rail Transit Line 1. The results show that the arc detection system can detect the arcing of pantograph-catenary system in urban rail effectively, reflect the intensity of arc linearly and is free from the interference from natural light and train running direction.