35kV、10kV户内真空断路器操动机构常见故障及处理探讨

在电力系统里,35k V户内真空断路器以及10k V户内真空断路器是使用频率最高的设备,是高压开关柜的核心部分,在整体间隔中扮演着重要的角色。对于高压开关柜来说,它们是其关键设备。因为10k V和35k V户内真空断路器比较可靠,在使用过程中比较稳定,所以被电力系统主网变电站广泛应用。在平常对电力系统进行维护时,10k V和35k V户内真空断路器自然成为它们重点关注的对象。首先分析了35k V户内真空断路器以及10k V户内真空断路器的弹簧操动机构动作原理,然后分析了两者在日常维护工作和检修工作中的问题,分析总结相关经验,最后有针对性的提出相关措施。     

500kV建塘输变电工程高海拔外绝缘特性及绝缘配合研究

<正>1研究背景在国家实施西部大开发的战略和实施西电东送的能源政策趋势下,超高压长距离大容量输电走廊和变电站必然经过西部高海拔地区。随着海拔高度的增加,空气密度逐渐降低,相同间隙的空气绝缘强度会不同程度的降低。我国500k V输变电工程设计工作已有20多年的成功经验,750k V、1 000k V变电站的绝缘配合研究也取得了很大的成绩,研究成果均已在实际中得到应用。但国内外关于高海拔的     

10kV配电线路设计技术探讨

配电线路是连接用户和电力系统的一个重要环节,是整个电力系统运行过程中一个非常重要的组成部分,因此在完成配电吸纳路设计过程中配电线路的设计和连接等各个方面的工作开展就变得非常重要。10k V配电线路是整个设计规划的核心部分,因此在配电线路设计规划过程中一定要准确的抓好10k V配电线路设计过程,通过科学合理的完成设计过程,有效的保证整个配电线路的安全、可靠、经济,从而有效的保障整个电路系统的安全稳定运行。     

10kV配电线路综合故障定位方法

随着我国社会经济的不断发展和进步,人们的生活水平得到了普遍的提高,我国各个企业也在不断地创新自身的技术来促进自身的进一步发展,提高自身的社会竞争力。在我国的电力建设企业发展过程中,10k V配电线路施工工程是其中的一项难度系数较大的工作,以致于在施工过程中容易出现各种各样的综合故障。然而10k V配电线路的高效施工对于我国人们日常生活正常用电有着非常重要的影响,因此我国必须尽快采取科学合理的措施来加强10k V配电线路综合故障定位方法的应用,达到有效解决10k V配电线路综合故障的效果。本文就关于10k V配电线路综合故障定位的概念介绍、在10k V配电线路综合故障定位过程中应用的方法及相对应优化10k V配电线路综合故障定位方法的有效措施三个方面展开了较为细致的探讨。     

利用淘汰的大容量电池组改装UPS电源

随着广播电视事业的发展,对安全播出的要求不断提高,这样不间断电源UPS就越来越需要。但由于各种原因,某发射台一直没有配备UPS电源。2009年由于全省微波数字化改造完成,原有的微波设备被淘汰,其中包含有大容量的蓄电池组,利用其和原有的直流屏组合可稳定的输出24V直流电,据此将它们改装为一个输出220V工频交流电的UPS电源,供信号机房内重要的信号源设备使用,提高了安全播出的可靠性。     

往复炉排锅炉落灰系统的改造

燃煤型往复炉排锅炉.由于锅炉炉排片间有2—3mm的间隙,所以,在炉排前部预燃区部分,较小颗粒的燃煤极易透过炉排的间隙落入锅炉的落灰系统而进入锅炉灰渣中,造成燃煤浪费。降低锅炉热效率。由于炉排间隙一、是为了使鼓风机的空气进入炉膛而使煤充分燃烧。二、是为了使炉排运动自如,阻力较小,所以减小炉排间隙,是不科学,不合理的。如何利用     

10kV架空配电线路防雷措施配置方案的研究

随着经济社会的发展,居民生活以及社会生产对电能的需求与日俱增,同时对电力企业的发展提出新要求。基于此,文章根据配电线路感应雷跳闸的特征,分析当前10k V架空配电电路出现雷击的原因与影响,介绍了10k V架空配电线路雷击后跳闸的原理,最后详细论述了10k V架空配电线路防雷击的具体方案,希望在优化10k V架空配电线路防雷击的基础上,能够与相关人士共同探讨。     

10kV电力配网工程施工技术及管理方案

近几年,我国10k V电力配网工程项目不断增多,其也是我国电网中的一项重要构成部分,其在电网中扮演着重要角色,人们也对10k V电力配网工程项目建设过程中应用的各项技术的提出了更高的要求。从目前,我国10k V电力配网工程的建设情况来看,施工技不仅体现在技术方面,而且也要注重管理问题。     

110KV线路跨越既有铁路(公路)间隙性停电施工方法及保证安全供电的措施

110k V线路跨越既有铁路(公路)间隙性停电的施工,不仅在技术上要求高,而且在施工方法以及施工过程中的安全措施上要求更为严格、谨慎,尤其是跨越电气化铁路施工,必须确保施工方案万无一失。     

10kV高压室的电气安装施工和控制剖析

随着经济的发展,城市新建写字楼、工厂、综合性办公楼、高层建筑小区不断增加,10k V高压室成为小区的必备设施。一般220k V、110k V等高压输电均需通过变电站将电压降到10k V等级,10k V高压室的作用是将10k V的输入电压转化为220V/380V的输出电压。10k V高压室是使用终端与输配系统之间的桥梁,被广泛的应用在工作和生活中。因为10k V高压室是供配电系统的重要组成部分,所以要严格把握10k V高压室的安装施工和质量控制。     

ATM网络的可变比特率分层视频编码

提出一种适用于ＡＴＭ网络的可变比特率分层编码新算法，称为运动补偿子带分层视频编码．它能克服ＡＴＭ网络中信元丢失造成的图像质量下降，实现高质量的视频通信．模拟结果表明：这种新算法比现有的同类算法有更好的性能．     

The interaction effects of online reviews and free samples on consumers’ downloads: An empirical analysis

Consumers’ software purchase decisions are influenced both by online reviews and by their experiences with free samples provided by firms. This paper empirically investigates the differential effects of online reviews (user and editor ratings) on consumers’ sample downloading behavior, using a dataset drawn from a large software free sampling website CNET.com. Our findings extend the previous research by suggesting that information disclosure levels of free samples (indicated by licenses) moderates the impacts of online reviews on consumers’ sample downloads. For samples that disclose a great level of information, higher user ratings can increase downloads; otherwise, higher user ratings fail to increase downloads. When both user and editor ratings are available to consumers, only user ratings can increase sample downloads. The findings can be explained by consumers’ two-stage information process whereby consumers first refer to online reviews and then determine whether to sample software. This study provides practical implications on the design of information disclosure channel and offers suggestions for firms regarding how to select and apply sample licenses.     

我国寿险需求影响因素的实证分析

应用自回归分布滞后模型对我国寿险需求进行了实证研究。与已有的研究相比，本文消除了保费收入数据中因统计口径变化带来的影响，建模时考虑了时间序列的平稳性，而且考查了更长的时间跨度。研究表明，国内生产总值的增长和寿险业自身的发展是寿险需求增长的根本原因，实际利率和少年儿童赡养(抚养)率对寿险需求也有显著的影响，社会的老龄化、预期通货膨胀率和不断提高的教育水平对寿险需求的作用并不显著。     

Feature extraction related to bearing damage in electric motors by wavelet analysis

The purpose of this paper is to extract features from vibration signals measured from motors subjected to accelerated bearing fluting aging and to detect the effects of bearing fluting at each aging cycle of induction motors. This trending of bearing degradation is achieved by monitoring the changes in the vibration signals at various sub-band levels. This is accomplished by the application of wavelet transforms and multi-resolution analysis in order to extract information from selected frequency bands with minimum signal distortion.     

RGAN-EL: A GAN and ensemble learning-based hybrid approach for imbalanced data classification

Imbalanced sample distribution is usually the main reason for the performance degradation of machine learning algorithms. Based on this, this study proposes a hybrid framework (RGAN-EL) combining generative adversarial networks and ensemble learning method to improve the classification performance of imbalanced data. Firstly, we propose a training sample selection strategy based on roulette wheel selection method to make GAN pay more attention to the class overlapping area when fitting the sample distribution. Secondly, we design two kinds of generator training loss, and propose a noise sample filtering method to improve the quality of generated samples. Then, minority class samples are oversampled using the improved RGAN to obtain a balanced training sample set. Finally, combined with the ensemble learning strategy, the final training and prediction are carried out. We conducted experiments on 41 real imbalanced data sets using two evaluation indexes: F1-score and AUC. Specifically, we compare RGAN-EL with six typical ensemble learning; RGAN is compared with three typical GAN models. The experimental results show that RGAN-EL is significantly better than the other six ensemble learning methods, and RGAN is greatly improved compared with three classical GAN models.     

基于光场渲染的动态3D目标重构技术

提出了一种基于光场渲染的动态3D目标重构的方法.目前基于图像建模的方法对于复杂场景难以建模,而基于图像渲染的方法因数据量大不利于动态场景的实时渲染.因此采用了模型和图像相结合的方法,从多视点视频图像中重建动态3D模型,采用光场映射算法对重建的3D模型进行光场采样,然后对样本分解压缩.实验结果表明,在保证真实感的同时,减少了数据量,并可实现动态3D目标的重构.     

110kV中性点经电阻接地系统的研究

我国110kV配电系统大多采用中性点直接接地方式,发生单相接地故障时负荷侧电压跌落严重,影响对用户的正常供电;短路电流也很大,有些情况下甚至会超过三相短路电流,影响断路器遮断容量的选择。文章对110kV系统中性点经电阻接地方式进行了研究,结果表明,与110kV系统中性点直接接地相比,中性点经电阻接地可有效减小单相接地故障电流,使其小于三相短路电流,且明显抑制单相接地故障时负荷侧的电压跌落程度,提高电能质量。如果合理选择中性点接地电阻值,还能保证各种过电压水平不超过现有110kV电气设备绝缘水平,继电保护装置也能正确动作。经PSCAD软件进行仿真,验证了以上结论。     

The Comparison between the International Population Aging and the Level of Economic Development

Population aging is a world problem, which will not only completely change the current population age structure, but also will change the labor supply, investment banking, savings deposits, labor productivity and inherent structure. Based on the author’s work and study experience, from an international perspective, in this paper,the relationship between population aging and economic development level is compared. This paper first puts forward that the population aging is a global trend, then this paper compares the relationship between the international population aging and the level of economic development, finally, it analyzes the relationship between the "old" and the "rich".     

Delta modulation of time-discrete signals with independent samples

Previous studies of Delta Modulation (DM) were predominantly concerned with various aspects of noise introduced by the quantising process. This paper is primarily directed towards the DM-signal behaviour, a concern which becomes necessary when optimizing the DM-system against the disturbances of the transmission channel. The statistics of the output signal is considered analytically under the assumption of independent input-signal samples. The approximate distribution of the output signal is derived and graphically compared with the exact distribution. Finally, the incidence of sample correlation is considered on the basis of results produced by means of simulation.     

基于水分的北方农牧交错带植被生态系统退化机理研究——以武川县为例

水是北方农牧交错带最关键的生态环境因子,水资源与生态环境之间的相互关系和相互影响很大程度上决定了北方农牧交错带的环境状况与环境动态。文章从生态缺水的角度,以内蒙古自治区武川县为例,探讨了生态系统退化机理,为北方农牧交错带的生态恢复与重建提供科学依据。研究结果表明,生态缺水是造成北方农牧交错带植被生态系统退化的主要原因。2006年武川县天然草地、灌木、乔木、农作物生长季平均耗水量分别为150.3mm、193.4mm、213.3mm、158.6mm,最小生态缺水量分别为93.1mm、38.2mm、251.5mm、96.6mm,植被生态系统继续向退化方向演替。合理调整植物品种结构,配置有限的水资源是当地生态恢复与重建的紧迫任务。