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大准铁路的快速发展对接触网的供电可靠性和系统维修提出了更高的求。接触网周期修和状态修是两种最为普遍的接触网检修方式,合理地安排接触网周期修和状态修,以及它们之间的过渡方式,是本文研究的课题。 相似文献
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随着社会经济的发展和科学技术水平的提高,电力系统设备维修体制正逐步向状态检修体制过渡。本文对状态监测及故障诊断技术在变电站二次设备状态检修中的应用进行了阐述,并给出了变电站二次设备状态检修的过程。 相似文献
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电厂大力提倡设备状态检修 总被引:1,自引:0,他引:1
电厂设备传统的检修方式(定期检修和故障临时性维修)已暴露出“增加检修费用、降低设备的利用率、增加检修人员的劳动强度”等缺陷。要采用一种较好的检修体制——状态检修,状态检修具有“克服定期检修的盲目性,具有很强的针对性;减少停运(总检修)时闭,提高设备可靠性和可用系数;减少维护工作量,降低劳动强度,有利于提高经济效益”等明显的优点。 相似文献
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介绍基于嵌入式系统技术的电气化铁路接触网参数检测语音装置的设计实现、研制过程与应用效果,针对在现场实际电气化铁路接触网天窗作业过程中存在的参数修前修后反复测量确认、地面测量人员劳动安全难以保证、检修效率低下等问题;研制开发了参数语音读数装置,使铁路接触网工区检修人员可以在参数检测语音播报贯穿整个修前修后过程中执行检修任务,取消了地面测量人员,提高了接触网天窗利用率;从而达到节约成本、提高检修效率的目的,推进了电气化铁路接触网专业修制修程的改革。 相似文献
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变电站设备状态检修的目的是为了及时有效地监测设备的运行状态,发现设备的潜伏性故障。既要提高设备运行可靠性,又要确保较高的供电可靠率,也就对电力设备的维护提出了更高的要求,而以往所普遍采用的设备定期维修的弊端越来越突出,以状态检修.逐步取代定期检修已成为电力系统设备检修的必然趋势。对变电设备的状态检修,包括故障检修、周期性检修以及状态检修进行介绍.在此基础上对变压器、断路器、容性设备、数字化变电站等状态检测进行了分析。 相似文献
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马也 《中国新技术新产品精选》2013,(12):249-249
介绍点检定修在观音阁水力发电厂中的管理应用,根据辽宁观音阁水力发电厂设备维修的经验提出点检定修是改革传统的计划检修向状态检修过渡的方法,是观音阁电厂设备管理的一场重大变革。 相似文献
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变电设备的可靠性对经济和社会影响巨大,随着电力生产体制的改革以及故障诊断等相关技术的进步和普及,推行状态检修势在必行。文章阐述了变电设备检修体制的演变、现行检修体制以及状态检修体制,分析了推行状态检修面,瞄的问题,在试行准状态检修开展情况和个人的体会,对开展状态检修工作有积极意义。 相似文献
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刘明国 《中国新技术新产品精选》2011,(23):60-60
高速铁路线路养护维修的主要特点是按设备的状态进行必要的状态修,做到既不失修也不过剩修,避免了养护维修中的盲目性,使设备始终处于可靠受控状态。线路养护维修的组织管理分为修养分开和修养合一形式。我国线路养护维修组织管理以修养分开为目标,鼓励专业维修公司的发展,注重线路维修质量以及维修新技术的应用,以适应客运专线的养护维修。 相似文献
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随着科学技术水平的不断进步,检修方式逐渐从定期检修发展成为状态检修,状态检修的成功应用象征着科学运维管理水平的飞跃提高,标志着我国设备维修水平进入了一个全新的阶段。状态检修有效降低了停电次数和操作风险,极大程度上提升了电网运行的可靠性和安全性,状态检修成为未来电网发展的必然趋势。该文主要研究了110k V及以下输变电运行设备实行状态检修,提出了相应的建议,促进电网的发展。 相似文献
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Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness. 相似文献
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Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly. 相似文献
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理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。 相似文献
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As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death. 相似文献
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Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula- 相似文献
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Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re- 相似文献
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Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that 相似文献
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《上海师范大学学报(自然科学版)》2014,(5):550
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with 相似文献
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《吉林大学学报(理学版)》2014,(5):1105
<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has 相似文献