配电线路防雷保护对策分析

随着我国电力行业规模的不断扩大,电力配送网络中出现线路故障的频率也越来越高。这不仅会影响整个电力系统的正常运行,而且还会对人身和财产安全造成威胁。文章分析了雷电对配电线路的损害,探讨了配电线路防雷保护的对策以及常见的防雷保护装置,以此为配电线路防雷保护提供参考。     

济南市C区10KV配电线路防雷方案研究

10KV配电网络结构复杂、绝缘水平比较低,不但直击雷能对其造成雷害事故,而且感应雷也能对其造成较大的危害。在配电网故障中,配电线路故障占了绝大部分,而配电线路故障中又尤以雷击跳闸故障的比重最大,尤其是济南市C区的配电线路中,线路故障基本上都是由于雷击跳闸而引起的。本文以济南市C区10kV配电线路为研究对象,针对C区10kV配电网的防雷现状,提出防雷措施。     

关于配电线路防雷与接地应对措施的研究

大多数配电线路跳闸及停电事故都是由雷电导致的,不仅影响了配电线路的安全运行,同时对人们的工作、生活都带来很大的影响,并造成巨大的损失,因此做好配电线路的防雷和接地工作非常重要。笔者结合自身工作经验,对配电线路防雷与接地措施进行深入分析,以保证配电线路的安全运行。     

配电变压器防雷保护的探讨

配电变压器在电力系统中起着至关重要的作用，近几年来，配电变压器遭受雷电侵害较为严重。文章介绍了配电变压器雷害事故的原因及几种配电变压器的防雷保护措施。配电变压器的防雷措施多种多样，应因地制宜地合理选择。     

谈配电线路防雷技术

对配电线路防雷技术进行分析,并在提出问题的基础上,针对10kV配电设备防雷保护提出一些建议和措施.     

配电系统中防雷接地技术的研究

雷电可以在瞬间产生巨大的电压,配电系统如果被雷电击中的话,会遭到严重的破坏,因此防雷接地防护技术对于保护配电系统至关重要,它可以使配电系统免受雷电的打击,从而保护设备和人员的安全。本文阐述了配电系统中几种重要的防雷技术措施,指导管理技术人员因地制宜地采取比较有效地防雷技术,确保做到安全有效、技术领先、经济合理的配电系统防雷接地改造。     

10kV配电线路雷击故障分析及防雷措施

现阶段我国10kV配电线路跳闸事故线路70%以上由雷击造成,线路一旦遭遇雷击很容易造成设备损坏而停电.为了提高10 kV配电线路运行的稳定性和可靠性,就必须研究并应用10kV配电线路防雷措施.     

浅谈10kV配电线路防雷保护措施

近年来,随着我国科学技术的不断进步,电力事业的不断发展,10 k V配电线路防雷工作作为我国整个电网施工过程中的重要组成部分,它不仅肩负着维护供电安全的重要使命,同时也是保障我国电力事业能够不断向前发展的有效途径。因此在新的形势下加强对10 k V配电线路防雷进行保护是我国配电网网事业面临的首要问题。[1]现阶段我国10 k V配电线路防雷保护工作存在诸多不足,这不仅会影响我国配电电网和供电电网的安全,造成电击事故,同时也影响了人们正常的生活、生产和工作。文章针对新形势下我国10 k V配电线路防雷保护工作的现状以及存在的不足,进行深入的分析,并且提出几点有效的防雷保护措施,从而促进我国配电网事业的向前发展。     

10kV配电线路的防雷措施

随着我国经济的发展,对配电线路的要求也越来越高,特别是在配电线路的防雷方面,文章对10 kV配电线路的防雷措施进行了探讨,以求提高10 kV配电网安全运行水平。     

10kV配电线路的防雷措施

随着我国经济的发展,对配电线路的要求也越来越高,特别是在配电线路的防雷方面,文章对10 kV配电线路的防雷措施进行了探讨,以求提高10 kV配电网安全运行水平。     

On Riesz distribution

The Riesz distribution for real normed division algebras is derived in this work. Then two versions of these distributions are proposed and some of their properties are studied.     

Proportional distribution schemes

An amount of income can be obtained jointly by m agents, the ith agent's share of income being θ_i. The income and the utilities of each agent are functions of the state of nature. Each agent has a probability measure over the states of nature. An efficient proportional distribution is one which is (1) Pareto optimal and for which (2) the expected proportion of income agent i recieves divided by θ_i is independent of i. It is shown that if the attitudes are strictly concave then there exists exactly one proportional distribution scheme. Furthermore, in special cases, each agent expects to recieve an income that exceeds his share.     

About inheritance distribution

In this work, we propose two axiomatic procedures to distribute an inheritance based on monetary compensations. In a cooperative context, the differences among the agents’ evaluations of the goods are used to increase everyone’s participation. When the goods’ valuations are heterogeneous each agent gets much more than 1/n of the value he believes the inheritance has.The two procedures are characterized by three criteria, namely: money preservation, Pareto optimality, and a certain kind of proportionality. The difference of the procedures is determined by the kind of proportionality used.     

A product Pareto distribution

The Pareto distributions are becoming increasing prominent in several applied areas. In this note, a new Pareto distribution is introduced. It takes the form of the product of two Pareto probability density functions. Various structural properties of this distribution are derived, including its cumulative distribution function, moments, mean deviation about the mean, mean deviation about the median, entropy, asymptotic distribution of the extreme order statistics, method of moments estimates, maximum likelihood estimates and the Fisher information matrix. The calculations involve the use of several special functions.     

Parcel distribution timetabling problem

In this paper we propose a model to generate an effective timetable for time definite parcel distribution companies operating a hierarchical hub-and-spoke network. The model, referred to as parcel distribution timetabling problem, provides the departure times from each serviced city and each servicing facility in order to minimize the travel times of all shipments from their origin cities to their destination cities. Although the problem is faced by every parcel distribution company, it is rarely addressed in the literature. There is no evidence that parcel distribution companies, including the international ones, are developing operational research models in generating their timetables. The application of the model to a real-world case led to a decrease of more than 11% in the average travel time of the shipments. The company was even more delighted by the rapidity of the model in generating the timetable; this task that used to take weeks is decreased to just minutes.     

Learning a population distribution

This paper introduces a dynamic Bayesian game with an unknown population distribution. Players do not know the true population distribution and assess it based on their private observations using Bayes׳ rule. First, we show the existence and characterization of an equilibrium in which each player׳s strategy is a function not only of the player׳s type but also of experience. Second, we show that each player׳s initial belief about the population distribution converges almost surely to a “correct” belief.     

The Pareto optimality distribution

Pareto optimality (sometimes known as Pareto efficiency) is an important notion in social sciences and related areas, see e.g. Klaus (2006), Chun (2005), Hild (2004), Kibris (2003), Nandeibam (2003), Papai (2001), Peris and Sanchez (2001), Brams and Fishburn (2000), Denicolo (1999), Klaus et al. (1998), Peremans et al. (1997), and Vohra (1992). This notion invariably involves the comparison of the utility of one outcome versus another, i.e. the ratio of two utilities or in general the ratio of two random variables. In this note, we derive the exact distribution of the ratio X/(X + Y) when X and Y are Pareto random variables, Pareto distribution being the first and the most popular distribution used in social sciences and related areas.     

Non-dictatorial public distribution rules

Review of Economic Design - This paper considers an exchange economy with no individual endowment where agents have classical quasi-linear preferences and the total available resources are to be...     

Nonparametric estimation of distribution functions

Summary Using Silverman and Young’s (1987) idea of rescaling a rescaled smoothed empirical distribution function is defined and investigated when the smoothing parameter depends on the data. The rescaled smoothed estimator is shown to be often better than the commonly used ordinary smoothed estimator.     

第一制药东京物流中心

2005年11月，笔者有幸前往日本考察了不同行业的6个物流中心，对其先进的管理、高效率的运作、强大的物流功能，留下了十分深刻的印象。其中，日本第一制药东京物流中心更以高度的自动化、极其严格的安全与质量管理、顺畅的流程、乃至高昂的造价．受到格外关注。