苏州轨道交通1号线列车空调系统高压故障分析及对策

Analysis and Countermeasures for High-voltage Faults in the Air Conditioning System of Suzhou Rail Transit Line 1

目的:2019年苏州地铁1号线列车空调系统高压故障频发,导致可上线列车数的减少及乘客投诉的增加,需找出故障的原因,并制定相应的改进措施。方法:基于列车空调发生高压故障常见故障原因开展初步排查,排除了部分故障因素;结合2019年1号线发生的19次列车空调高压故障发生的时段、日期及地点,对空调机组故障时的热负荷、外部温度及列车运行环境等因素开展进一步分析。找到故障原因后,提出了列车空调系统的优化及改进措施。结果及结论:故障的直接原因是隧道内局部区域的空气对流不佳。隧道整体环境温度越高,空调系统压力升高至超过高压开关动作阈值所需的时间越短,发生高压故障的概率就越高。在综合考虑了可行性和经济性后,采用了优化空调控制逻辑、控制列车在存车线停留时空调的开启时长这2项对策。经过运营验证,这2项对策有效杜绝了1号线因局部位置失去列车运行气流造成的空调高压故障。

Objective:In 2019,high voltage faults occurred frequently in the air conditioning system of Suzhou Metro Line 1 trains,resulting in a decrease of operational train number and an increase of passenger complaints.It is necessary to identify the cause of the faults and develop appropriate improvement measures.Method:Focusing on the common causes of high-voltage faults in train air conditioning,preliminary investigations are carried out and some causes are ruled out.Combining the time,date,and location of 19 train air conditioning faults on Line 1 in 2019,the heat load,external temperature,and train operating environmental factors of the air conditioning unit faults are analyzed in-depth.To identify the causes of the faults,optimization improvement measures are proposed.Result&Conclusion:The direct cause of the malfunction is poor air convection in local areas of the tunnel.The increase of the overall ambient temperature within the tunnel and decrease of the time required to exceed the threshold for high-pressure switch action due to higher system pressure,results in a higher probability of high-pressure failures.After considering feasibility and cost-effectiveness comprehensively,two strategies are adopted:optimizing air conditioning control logic and controlling the duration of air conditioning activation when the train is parked at the storage line.After operational verification,these two strategies effectively prevented air conditioning high-pressure failures caused by the loss of train airflow in certain locations along Line 1.