Purpose–The purpose of this study is to address the deficiency in safety monitoring technology for 27.5 kV high-voltage cables within the railway traction power supply by analyzing the grounding methods employed in h...Purpose–The purpose of this study is to address the deficiency in safety monitoring technology for 27.5 kV high-voltage cables within the railway traction power supply by analyzing the grounding methods employed in high-speed railways and developing an effective monitoring solution.Design/methodology/approach–Through establishing a mathematical model of induced potential in the cable sheath and analyzing its influencing factors,the principle of grounding current monitoring is proposed.Furthermore,the accuracy of data collection and alarm function of the monitoring equipment were verified through laboratory simulation experiments.Finally,through practical application in the traction substation of the railway bureau on site,a large amount of data were collected to verify the stability and reliability of the monitoring system in actual environments.Findings–The experimental results show that the designed monitoring system can effectively monitor the grounding current of high-voltage cables and respond promptly to changes in cable insulation status.The system performs excellently in terms of data collection accuracy,real-time performance and reliability of alarm functions.In addition,the on-site trial results further confirm the accuracy and reliability of the monitoring system in practical applications,providing strong technical support for the safe operation of highspeed railway traction power supply systems.Originality/value–This study innovatively develops a 27.5kV high-voltage cable grounding current monitoring system,which provides a new technical means for evaluating the insulation status of cables by accurately measuring the grounding current.The design,experimental verification and application of this system in high-speed railway traction power supply systems have demonstrated significant academic value and practical significance,contributing innovative solutions to the field of railway power supply safety monitoring.展开更多
高海拔地区环境条件对电气开关设备的电气性能影响较大,通常需要根据高海拔环境条件对电气设备重新设计以满足高原地区使用要求,设备的造价将大幅增加。为设计出适合高海拔地区电气化铁路使用的27.5 k V电气开关设备,文章详细分析了高...高海拔地区环境条件对电气开关设备的电气性能影响较大,通常需要根据高海拔环境条件对电气设备重新设计以满足高原地区使用要求,设备的造价将大幅增加。为设计出适合高海拔地区电气化铁路使用的27.5 k V电气开关设备,文章详细分析了高海拔地区环境条件对电气开关设备的影响,提出了高海拔地区27.5k V开关设备采用不受海拔高度影响的气体绝缘开关柜,同时将开关柜出线方式由电缆出线调整为架空出线的设计方案。并通过理论分析、数值计算、结构设计、仿真研究等方法,设计出了高原型架空出线27.5k V气体绝缘开关柜,进行了样机制造,通过了高海拔试验验证,为今后高原地区电气化铁路设计和电气设备选型提供了参考依据。展开更多
基金the China Railway Wuhan Bureau Group Co.,Ltd.under the 2023 Science and Technology Research and Development Plan(Second Batch)(Wuhan Railway Science and Information Letter[2023]No.269),classification code 23GD07.
文摘Purpose–The purpose of this study is to address the deficiency in safety monitoring technology for 27.5 kV high-voltage cables within the railway traction power supply by analyzing the grounding methods employed in high-speed railways and developing an effective monitoring solution.Design/methodology/approach–Through establishing a mathematical model of induced potential in the cable sheath and analyzing its influencing factors,the principle of grounding current monitoring is proposed.Furthermore,the accuracy of data collection and alarm function of the monitoring equipment were verified through laboratory simulation experiments.Finally,through practical application in the traction substation of the railway bureau on site,a large amount of data were collected to verify the stability and reliability of the monitoring system in actual environments.Findings–The experimental results show that the designed monitoring system can effectively monitor the grounding current of high-voltage cables and respond promptly to changes in cable insulation status.The system performs excellently in terms of data collection accuracy,real-time performance and reliability of alarm functions.In addition,the on-site trial results further confirm the accuracy and reliability of the monitoring system in practical applications,providing strong technical support for the safe operation of highspeed railway traction power supply systems.Originality/value–This study innovatively develops a 27.5kV high-voltage cable grounding current monitoring system,which provides a new technical means for evaluating the insulation status of cables by accurately measuring the grounding current.The design,experimental verification and application of this system in high-speed railway traction power supply systems have demonstrated significant academic value and practical significance,contributing innovative solutions to the field of railway power supply safety monitoring.
文摘高海拔地区环境条件对电气开关设备的电气性能影响较大,通常需要根据高海拔环境条件对电气设备重新设计以满足高原地区使用要求,设备的造价将大幅增加。为设计出适合高海拔地区电气化铁路使用的27.5 k V电气开关设备,文章详细分析了高海拔地区环境条件对电气开关设备的影响,提出了高海拔地区27.5k V开关设备采用不受海拔高度影响的气体绝缘开关柜,同时将开关柜出线方式由电缆出线调整为架空出线的设计方案。并通过理论分析、数值计算、结构设计、仿真研究等方法,设计出了高原型架空出线27.5k V气体绝缘开关柜,进行了样机制造,通过了高海拔试验验证,为今后高原地区电气化铁路设计和电气设备选型提供了参考依据。
