一起220kV线路单相接地事故分析及应对措施

华电大同第一热电厂运行两台135MW循环流化床机组,厂内设110k V和220k V两级母线。文章先给出一起单相接地故障的案例,再从光纤电流纵差保护、距离保护和重合闸三方面对该故障过程进行分析,判断保护动作的正确性。     

220kV母线故障时线路纵联保护动作行为分析

以双母线接线方式下发生母线单相接地故障为例,分析了接于母线上各种原理纵联保护的动作逻辑.通过分析,熟悉母线故障时变电站纵联保护的动作行为,在出现此类故障时,能够迅速做出判断,分析动作结果.     

输电线路保护相关技术研究

本文介绍了目前电力系统中广泛应用的几种输电线路保护的基本原理,对距离保护、电流差动保护、方向高频保护、后备保护的动作特性进行了分析。     

35kV主变保护动作实例分析

电力系统中的继电保护装置因各种原因要动作多次,其中大部分故障现象清晰、装置动作正确,易于判断,但还存在少量不明原因的动作记录或复合故障造成的装置动作,给故障后的正确分析判断、处理带来困难。文章以某变电站35k V主变后备保护一次复合故障动作过程为例,从动作逻辑进行分析,找出疑点,排查问题,找出保护动作的真正原因。     

电力变压器瓦斯保护动作原因与对策

变压器内部故障的主保护是瓦斯保护,它能瞬间切除故障设备。若瓦斯保护动作,变压器开关跳闸,一般情况下,其事故过程已结束,后果比较严重。因此,必须在瓦斯信号动作时,认真检查,仔细分析,正确判断,立即采取措施。     

浅谈变压器的瓦斯保护

本文对瓦斯保护的保护范围、瓦斯保护装置动作的原因及处理方法等进行了简单论述,使运行人员在故障发生时通过保护动作情况及时准确的作出判断,并进行处理。     

分相电流差动保护动作判据的研究

文章通过利用MATLAB软件中的Simulink工具箱对电力系统的短路故障进行模拟,并对分相电流差动纵联保护动作判据进行动作行为的分析。仿真的结果表明,分相电流差动纵联保护对各种短路故障的判断具有绝对的选择性和较高的灵敏性。     

分相电流差动保护动作判据的研究

文章通过利用MATLAB软件中的Simulink工具箱对电力系统的短路故障进行模拟.并时分相电流差动纵联保护动作判据进行动作行为的分析.仿真的结果表明,分相电流差动纵联保护对各种短路故障的判断具有绝对的选择性和较高的灵敏性.     

110kV变压器间隙零序保护动作探析

110千伏变压器间隙零序保护动作,是110千伏变压器在运行过程中出现运行障碍的时候,自动实行的一种保护动作,本文通过介绍实例,分析了110千伏变压器间隙零序保护的主要动作原理,以及分析了间隙零序保护动作的全过程和提高得措施。     

动力变比率差动保护动作跳闸原因浅析

摘要：差动保护是铝厂动力变压器的主保护，保护异常动作将使铝厂各个区域缺失动力电源，造成全厂失电，影响面极大。变压器差动保护动作时，我们需要注意到影响保护装置动作的各种因素，在保护设计、电流互感器的选用、保护整定等方面都要进行分析。本文结合工作中出现的差动保护异常动作情况，全面分析了变压器比率差动保护动作的原因及其防范措施，为变压器保护装置运行和保护整定提供了实际经验。     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

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.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

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.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

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.     

Accountability of NGOs in Bangladesh A critical overview

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.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

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.     

The Creation of the Office for National Statistics

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.     

What helps? Women engineers' accounts of staying on

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.     

论现代物流企业的发展观

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。     

浅谈大体积混凝土裂缝的控制

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。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

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.