首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
文章阐述了SF6电气设备故障的特征产物及SF6分解产物的检测方法和判断标准,通过故障实例分析了如何应用分解产物的现场测试分析设备运行状况和对故障部位的快速定位。  相似文献   

2.
文章阐述了SF6电气设备故障的特征产物及SF6分解产物的检测方法和判断标准,通过故障实例分析了如何应用分解产物的现场测试分析设备运行状况和对故障部位的快速定位。  相似文献   

3.
SF6气体具有良好的绝缘和灭弧性能,在断路器和GIS设备中得到广泛的使用。而当电力设备在出现绝缘故障时,SF6气体将会分解为SO2、H2S等产物,通过检测这些分解物的含量,可以对电力设备的绝缘故障进行诊断。文章阐述了SF6气体分解的机理,分析了故障诊断技术中对分解物的测试技术以及诊断方法。  相似文献   

4.
SF6气体具有良好的绝缘和灭弧性能,在断路器和GIS设备中得到广泛的使用。而当电力设备在出现绝缘故障时,SF6气体将会分解为SO2、H2S等产物,通过检测这些分解物的含量,可以对电力设备的绝缘故障进行诊断。文章阐述了SF6气体分解的机理,分析了故障诊断技术中对分解物的测试技术以及诊断方法。  相似文献   

5.
随着我国电力工业的发展,在电力系统中广泛使用SF6电气设备。SF6气体在设备故障时,与设备绝缘材料作用产生分解物,通过对分解物含量分析判断SF6设备存在故障的情况。本文将结合500kV某变电站利用SF6气体分解物分析判断电气设备故障实例说明SF6气体分解物分析在设备故障诊断中的应用。  相似文献   

6.
文章分析了SF6断路器的基本情况与其在发电厂电气检修中的优势,阐述了在发电厂电气中SF6断路器的应用、检测中发现的故障,对发电厂电气检修中SF6断路器的故障进行研究。提出一些发电厂电气检修中SF6断路器的维护措施,希望能够为SF6断路器能安全使用提供精准的数据,为日常的SF6断路器维护工作提供参考依据,提高发电厂电气中SF6断路器的维护质量,延长SF6断路器在发电厂电气中的使用寿命。  相似文献   

7.
目前SF6电气设备的应用广泛,但故障检测手段较少,对SF6电气设备分解产物进行检测能有效检出SF6电气设备局部的绝缘隐患,本文就SF6电气设备及其分解产物进行了简要介绍,并对SF6电气设备分解产物现场检测方法进行了比较分析。  相似文献   

8.
SF6高压电器故障中,SF6泄漏、SF6中微水超标造成的故障要占70%-80%。而且SF6气体又属温室效应气体,因此SF6泄漏、SF6中微水含量在线监测愈来愈受到重视。文中详细介绍了密度、微水及泄漏的在线检测方法。  相似文献   

9.
文章阐述了SF6气体分解物产生的原因,并且通过分解物的相关分析,提出了利用SF6气体分解产物诊断GIS等设备内部故障,实践表明,利用检测SF6气体分解产物的组分和含量来判断GIS内部故障,对电力企业GIS的运行监测及故障诊断具有很好的指导意义。  相似文献   

10.
220k V SF6断路器属于高压开关设备,有两种定义:能够关合、承载和开断正常回路条件下的电流,并能关合、在规定的时间内承载和开断异常回路条件(包括短路条件)下的电流的开关装置;用以切断或关合高压电路中工作电流或故障电流的电器,然而断路器实际运行中可能出现故障。文章对SF6断路器故障成因以及处理对策进行了分析。  相似文献   

11.
This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.  相似文献   

12.
Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.  相似文献   

13.
Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.  相似文献   

14.
NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.  相似文献   

15.
There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.  相似文献   

16.
A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.  相似文献   

17.
We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.  相似文献   

18.
杨明 《价值工程》2012,31(7):16-17
物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。  相似文献   

19.
丛广英  乔炜君 《价值工程》2010,29(6):245-245
大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。  相似文献   

20.
This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号