Equipment Optimization Scheme for High Failure Rate Auxiliary Converter of Metro Train in High Temperature and High Humidity Environment
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 9
Abstract
Objective Over high humidity in the operating environment of metro train auxiliary power supply system will lead to high leakage current of IGBT (insulated gate bipolar transistor), which may further cause the auxiliary converter failure. Therefore, it is necessary to optimize the internal environment of the auxiliary converter box based on the high temperature and high humidity environment to reduce the failure rate of IGBT. Method Based on a case study of the train auxiliary converter failure on Ningbo Metro Line 4, causes of IGBT failure are investigated, and four equipment optimization schemes are proposed, including reducing the speed regulation voltage of the auxiliary converter cooling fan, adjusting the direction of internal circulation fan to reduce the humidity around IGBT, improving the sealing between cabinet and the external part, and optimizing the cooling fan control logic. Simulation and on-site tests verify that the four optimization schemes are effective and operable. Result & Conclusion IGBT failure causes are as follows: on Ningbo Metro Line 4, the low on-site operation load of the train auxiliary converter, the low operating temperature of the components, the undischarged moisture inside the IGBT, while the fast air exchange rate in the auxiliary converter box results in rapid increase of humidity in the cabinet, further leading to the over high leakage current of IGBT module. The four optimization schemes can reduce the relative humidity in the auxiliary converter cabinet and improve the reliability of the IGBT operation.
Authors and Affiliations
Huijian HUANG, Yijun FAN, Hanchong SU, Xing HUANG, Anhui PU, Hongli HE
Keywords
Related Articles
- EP ID EP744353
- DOI 10.16037/j.1007-869x.2024.09.045
- Views 69
- Downloads 0
Disturbance Response and Control of Shield Construction Adjacent to Bridge and High-rise Buildings
［Objective］ The tunnel between Shengchanlu Station and Lihuanglu Station on Jinan Metro Line 2 passes in close proximity to the pile foundations of an elevated bridge and the Eurasia Electronics Building complex. To en...
Load Characteristics of B-type Metro Vehicle Bogie Frame
Objective The international standards adopted in metro vehicle design and verification in China do not fully align with the actual vehicle operating conditions, resulting in the phenomenon of fatigue cracks in some metro...
Mechanical Behavior of Urban Rail Transit Station Structure Based on Existing Shield Tunnel Interval Underground Excavation Construction
Objective Cancer Hospital Station on Shenzhen Rail Transit Line 14 adopts a scheme of large-diameter (8.5 m) shield tunnel expansion featuring tunnel-first and station-later. During the connection of the main station str...
Reflection on the Circle Line and Express Line in Shanghai Urban Rail Transit Network Planning
［Objective］ Since the implementation of the Shanghai Master Plan (2017-2035), with the development of five new Shanghai towns (Jiading, Qingpu, Songjiang, Fengxian, and Nanhui) and the Yangtze River Delta integration a...
Rapid Diagnostic Method for ZDJ9 Switch Machine Circuit Faults
Objective The existing diagnostic methods for ZDJ9 switch machine circuit faults have multiple steps, complex operations, and low efficiency, seriously affecting the fault repair efficiency. Thus, it is necessary to deve...