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一、概述 SS_4改进型电力机车采用恒流准恒速特性控制,速度传感器的好坏直接影响机车的正常运用。目前该型机车采用的几种不同型号的速度传感器,故障率较高,造成全车电流波动、空转/滑行误检测。下面介绍一种典型的故障现象: 97年2月20日,新配我段的SS_4改进型438~#电力机车首次试运用,便发现该车空转显示不止,全车电流波动严重,经随车添乘人员多方查找,最后怀疑故障出在机车速度传感器。二、原因分析
First, an overview SS_4 modified electric locomotive constant current characteristics of constant speed control, the speed sensor directly affects the normal use of the locomotive. At present, the locomotives used several different types of speed sensors, a higher failure rate, causing the entire vehicle current fluctuations, idling / taxiing false detection. The following describes a typical failure phenomenon: February 20, 97, the new section of SS_4 improved 438 ~ # electric locomotive for the first time trial operation, we found that the car idle more than the display, the whole current fluctuations, after the car Multi-staff Tim search, the last suspected fault locomotive speed sensor. Second, the reason analysis