变电站设备状态智能识别系统技术研究

针对目前变电站采用人工巡检判断设备状态的方式存在作业效率低、工作质量不高、巡检人员的安全难以保障的问题,集成应用开关状态综合判断技术、刀闸状态综合判断技术、智能巡检技术和视频联动技术等关键技术,研制了变电站设备状态智能识别系统,通过与数据采集与监视控制(SCADA)系统的信息交互,实现了变电站开关、刀闸设备状态的远程智能识别.该系统可在变电设备倒闸操作、定期巡检、专项巡检以及日常设备状态监视中代替人工巡检开关、刀闸设备状态,及时发现并预警设备状态隐患,提高了巡检效率和质量,降低了运行人员的劳动强度,保障了人身及设备安全.通过在500 kV文山变电站的应用实例表明,应用该系统在单台主变停电倒闸操作中可节省5.63工时,验证了系统的实用性和有效性.     

基于合闸暂态振动信号分析的变压器绕组松动缺陷早期诊断

本文中作者为了分析变压器合闸振动信号特征,提出一种基于经验小波变换的振动信号处理方法,并通过试验验证了该方法的可行性.     

基于PLC的建材生产自动化仓库设计与监控

建材货物仓库在建材制造企业中起着重要作用,随着现代化生产技术的发展,平面仓库已不能满足建材制造企业的需求.设计了一种基于PLC的建材生产自动化仓库,并利用组态王软件(M CGS)设计建材货物实时监控系统.该建材货物立体仓库使用简便,便于货物管理.     

焊接烟尘的危害及治理技术(二)

焊接烟尘弥散悬浮在车间，直接影响人体健康，采用分层送风方式可有效改善这一点。分析比较了分层送风相对于混合通风的优点，并介绍了以分层送风技术为主、治理整体厂房焊接烟尘的具体情况。     

Oxidation Performance of Fe-Al/WC Composite Coatings Produced by High Velocity Arc Sprayed at 650 ℃

Fe-Al intermetallics with remarkable high-temperatureintensity and excellent erosion,high-temperatureoxidation and sulfuration resistance are potential lowcost high-temperature structural material.ProducingFe-Al/WC composite coating by high velocity arcspraying(HVAS)on structural materials would notonly obviate the problems faced in fabrication of thesealloys into useful shapes,but also allow the effectiveuse of their outstanding high-temperature performance,which might thus promisingly mak…     

Fatigue Delamination Characteristics of Plasma Sprayed Coatings under Fretting

FRETTING is referring to a reciprocating motion withthe small displacement between two components incontact[1].Fretting wear is superficial materialremoval during the fretting.It severely reduces theperformance,efficiency and service lifetime of thecomponents[2],Thermal spraying has been employedto enhance the fretting wear resistance of components,and the fretting wear behavior of the coatings has beenalso explored.However,the experimental results wereoften contradictive and confusing.On …     

粉末烧结体镦粗致密与成形的有限元分析

选择典型的镦粗工艺对粉末烧结坯的致密与成形行为和规律进行了研究，提出了多孔材料的致密模型并简要介绍了多孔材料的塑性理论。然后，采用有限元法模拟了不同镦粗压下量的烧结坯的致密与成形过程。密度与等效应变分布的一致性表明，烧结坯的致密强烈依赖于材料的塑性变形。     

Oxidation performance of Fe-Al/WC composite coatings produced by high velocity arc sprayed at 800 ℃

Fe-Al/WC intermetallic composite coatings were prepared by high velocity arc spraying (HVAS) technology on 20G steel and the oxidation performance of Fe-Al/WC composite coatings was studied. The results demonstrate that the kinetics curve of oxidation approximately follows the logarithmic law and the oxidation velocity of Fe-Al/WC composite coatings is less than that of 20G steel after 5 h. The composition of oxidized coating is mainly composed of Al2O3, Fe2O3, Fe3O4 and FeO. These phases distribute unevenly. The protective Al2O3 film firstly forms and preserves the coatings from further oxidation.     

喷射成形1.8C-1.6Al超高碳钢快速凝固组织研究

铸造1．8C-1．6Al超高碳钢(UHCS)由于冷速较低，晶粒粗大，珠光体片间距也较大，品界形成了粗大的碳化物网络，同时合金元素产生偏析，品内生成了大块的合金渗碳体，使得它在室温下为脆性，机加工性能极差。喷射成形1．8C—1．6Al超高碳钢则利用喷射成形工艺冷却速度大的特点细化了晶粒，减小了珠光体的片间距，提高了硬度与强度，同时降低了元素偏析程度。同时发现：在铸态1．8C-1．6Al超高碳钢中和在喷射成形1．8C-1．6Al超高碳钢中Al在晶内的分布情况正好相反，由反偏析转变为正偏析。     

Photocatalytic oxidation activity of titanium dioxide film enhanced by Mn non-uniform doping

1 Introduction Heterogeneous photocatalysis is an effective technique for reducing the concentration of pollutants at low concentration. It has been demonstrated that almost all organics can be oxidized to generate carbon dioxide, water and simple mineral…