Research on the monitoring system for induced voltage and ground current of 27.5 kV cable sheath in railways

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.

Clinical Study on the Effect of Jiaotai Acupuncture Combined with Escitalopram on Mild Depression and Its Influence on Inflammatory Factors

[Objectives] To analyze the effect of Jiaotai acupuncture combined with Escitalopram on mild depression and its influence on inflammatory factors.[Methods] Eighty patients with mild depression admitted to Shenzhen Baoan District Central Hospital from March 2021 to March 2023 were randomly divided into observation group (40 cases) and control group (40 cases). The control group was treated with Escitalopram, and the observation group was treated with Jiaotai acupuncture on the basis of the control group. The overall efficacy, depression score before and after treatment, and the improvement of inflammation level were compared between the two groups.[Results] The total effective rate of the observation group was significantly higher than that of the control group ( P <0.05), and the improvement of depression score and inflammation level of the observation group was significantly better than that of the control group ( P <0.05).[Conclusions] Jiaotai acupuncture combined with Escitalopram can significantly reduce inflammation and improve symptoms in patients with mild depression.

影像科医院感染危险因素与管理对策

目的分析影像科医院感染管理策略对管理工作的影响。方法医院影像科在2018年1月开始针对科室医院感染的危险因素进行分析并对各环节工作进行改进,规范各方面的操作流程与标准,并将2018年全年科室医院感染发生率和2017年进行对比,评价强化管理的应用效果。结果2018年影像科医院感染发生率明显低于2017年(P<0.05)。结论强化管理能够有效降低影像科医院感染的发生率,从而减少交叉感染的出现,提高医院卫生管理效果。