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接触网线夹温度的在线监测
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摘要
接触网作为电力机车运行的动力源,是电气化铁路的关键设备,保证接触网工作性能的稳定对铁路运输系统的安全运行有重大意义。接触网发生局部过热和烧伤是常见故障类型之一,特别是在各电连接线夹、吊弦线夹、开关设备线夹及接续点等故障多发部位,容易发生异常过热导致烧坏设备,影响机车正常运行。目前的监测方法不能实时准确的得到线夹等的温度情况,所以在线监测异常点的温度情况显得尤为重要。
     本文针对接触网线夹等装置的发热和温升问题,提出了一种基于热释电红外技术的测温方法,避免了与线夹的接触,并且能够定点安装,实现了温度的实时监测。本文主要研究内容如下:阐述了接触网在线监测和线夹温度监测的意义,并对线夹温度监测的国内外现状以及红外测温的发展现状进行了分析;介绍了红外测温的基本原理,对三种不同的红外测温方法进行了比较,选取全辐射测温法作为接触网线夹测温的实现方法,提出了基于热释电探测器的测温系统整体方案;设计了各功能模块,电机控制电路实现对线夹的扫描测温,放大电路、滤波电路、检波电路、峰值检测电路等实现对传感器输出信号的调理;设计了单片机外围的数据采集和处理电路,对数据进行A/D转换和存储,并采集了环境温度;绘制了主程序流程图,并编写了中断处理程序、峰值判断程序、数据存取程序、环境温度采集程序和温度补偿程序;分析了环境辐射、辐射率、测温距离和硬件等因素对测温精度的影响,提出采用最小二乘法对测量得到的数据进行温度补偿和距离修正;实现了与太阳能电源和数据无线传输模块的联调,验证了温度在线监测装置的可行性。
Catenary line is the power source of electric locomotive running, it is the key equipment of electrified railway, ensure the stability of the catenary line performance have great significance to the safe running of the railway transport system. Local overheating and burns of the catenary line is one of the frequent faults, especially at failure-prone parts such as the electric connection clamp, dropper clip, switching device clamps and connection points, it is easy to appear abnormal overheating result in burned equipment, affect the locomotive's normal operation. The current monitoring methods can not be real-time accurately acquire the clamp's temperature, so on-line monitoring is particularly important to the abnormal points'temperature measure.
     According to the heating and rising temperature problem of catenary line clamp devices, the paper proposes thermometry method based on the pyroelectric infrared technology, avoids contact between the clamp, and fixed installation, achieving real-time monitoring temperature. The main research contents of this paper are as follows:expounds the significance of the catenary line on-line monitoring and clamp temperature monitoring, the clamp temperature monitoring domestic and international situation and the development status of the infrared temperature measurement; introduces the basic principles of infrared thermometry, compares three different temperature measurement methods, selects the full radiation as the thermometry method of clamps, the pyroelectric detector, proposes the whole project of temperature measurement system based on the pyroelectric detector; designs every functional module, the motor control circuit achieves scanning temperature measurement of clamps, the amplifier circuit, filter circuit, detector circuit, peak detection circuit realizes the sensor output signal's conditioning; designs microcontroller's peripheral data acquisition and processing circuit, realizes the data A/D conversion and storage, and collects environmental temperature; draws the main program flow chart, and compiles the interrupt handling program, peak judgment program, data access program, environmental temperature collection procedures and temperature compensation program; analyzes the environmental radiation, emissivity, temperature measuring distance and hardware factors on the influence of the temperature measurement precision; proposes the least squares method for the measured data's temperature compensation and distance correction; realizes the debugging with solar power and wireless transmission module, verifies the feasibility of temperature on-line monitoring device.
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