浅析配电线路防雷技术

雷击是电力网络的主要危害之一,通过对传统防雷措施,如避雷针,避雷器,避雷线等设备的讨论分析,按气候以及地理来分类讨论了各地防雷措施的不同以及防雷设备的管理维护问题,简单分析了目前防雷形式,强调了配电线路防雷对供电可靠性的重要性。     

110kV输电线路防雷技术综合应用与运维管理

110kV输电线路是电力系统区域性电力资源分配输送的重要组成部分。但是,在雷雨天气受地形条件、线路耐雷水平等因素影响,受雷击跳闸的几率较大。因此,应用一定的防雷技术、维护措施提高线路的安全性和可靠性具有必要性。本文对常见110kV输电线路防雷措施综合应用和维护管理等方面阐述输电线路的综合防雷措施。     

架空电力线路的防雷保护

随着我国国民经济的不断发展与进步,我国的电力需求量也在逐渐加大,电力生产的安全问题作为与人们生产生活息息相关的重要因素,已经得到了社会各界的普遍关注。以此,文章在分析了架空电力线路的防雷重要性的基础上,对具体的防雷保护措施进行了深入研究。     

高压架空输电线路防雷技术探讨

电力能源是我国经济建设过程中所必须的重要能源,电网的安全稳定和输电线路的稳定运行逐渐凸显出来。对于很多的高压架空输电线路来说,雷击事故常常是导致停电事故的直接原因,因此电力工作者有必要对高压架空输电线路的防雷技术进行深入的探讨和探究,从而确保输电线路能够安全稳定的供电。本文论述了现阶段高压架空输电线路防雷击工作中的一些问题,并结合笔者实际研究和工作经验,就其防雷技术提出了几点合理的建议。     

浅谈电力输电线路的运行维护及故障排除

输电线路是电力输送的主要媒介,在整个电力系统中发挥着不容忽视的作用。为了保证输电线路的可靠运行,需要定期对线路进行检查和维护,以便及时排除线路故障,使输电线路尽快恢复至正常状态,从而保持电力传输的连续性。本文将论述电力输电线路的运行维护和故障排除方法,并对防雷保护要点加以解析,以减少输电线路引发的安全事故,保证电力传输的稳定性和安全性。     

配电网线路防雷系统的保护及完善对策探究

雷击现象是影响我国电力网络运行的主要因素,特别是南方区域,当达到雨季时,电力网络受到雷击,将造成供电中断问题,严重影响经济产业的发展。基于此,文章立足于配电网线路防雷保护的重要性之上,从添设避雷线、配备避雷器装置、添设耦合地线、采用新型绝缘子等方面,对配电网线路防雷系统的保护措施进行研究。     

电力电网防雷电安全技术

针对架空输电线路的防雷处理,分析雷击跳闸的主要原因,并提出了具体的防雷电安全保护措施,提高电力电网供电的安全性.     

基于10kV配电线路防雷技术的研究

10kV线路属于中压输配电网络,是我国主要的供配电网络。但随着我国电力系统的不断发展,电力配送网络中出现线路故障的频率也越来越高。特别是在地形复杂、档距大和多雷的地区,由雷电原因导致引起线路跳闸的主要因素之一,雷电原因导致线路起火、坍塌不仅会影响整个电力系统的正常运行,还给人民群众的生命和财产带来巨大隐患。本文主要对10kV配电线路防雷现状危害及防雷技术进行了分析研究。     

浅析输配电线路防雷技术

输配电线路中因雷击跳闸造成的事故较多,其是威胁电网安全的严重问题之一,因此,采取有效的防雷保护技术,有效规避或减少输配电线路的雷击事故发生,是电力行业一直所关注的重点。文章就对输配电线路雷击造成的危害展开分析,同时探究输配电线路雷击闪络跳闸产生的原因,并提出几点有效、合理、先进的防雷技术措施,以供电力工作人员参考所用。     

配电线路运行检修以及防雷

配电线路作为电力运行中的重要部分,其运行的好坏将直接决定线路运行的质量。因此,做好对配电线路的运行检修,及时发现其中的问题成为保障运营的关键。同时防雷措施也是保障配电线路运行的重要措施。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.