110kV电站稳控装置与线路保护装置定值配合案例分析

本文通过一起并列运行双回线其中一回线路瞬时故障保护装置跳闸重合闸动作前稳控装置已动作切机的案例, 分析了110kV 并列运行双回线线路保护装置中距离III段动作时间、重合闸动作时间与110kV电站稳控装置切机动作时间失配的原因,总结了三者之间配合的基本原则;根据电网的实际运行情况,提出通过优化110kV线路保护距离III段动作时间、线路两侧重合闸动作时间来确保与稳控装置动作切机时间配合的解决方案,以避免重复发生线路瞬时故障重合闸动作之前稳控装置先行切机的类似事件,保证了机组发电的连续性及电网供电的可靠性,消除了110kV并列运行双回线线路保护装置与110kV电站稳控装置时间定值失配带来的不良影响。     

直流牵引供电系统线路检测与自动重合闸的配合

在直流牵引供电系统中,馈线断路器在合闸前及故障跳闸后重合闸前,需经过线路检测回路对线路进行非短路确认后才能合闸.本文阐述了线路检测及其与自动重合闸配合的原理,并介绍了直流牵引馈线的保护配置.根据运营实例,说明了线路检测在馈线保护中的作用,对其在运行中暴露出的整定及与自动重合闸配合问题进行了分析,并提出了解决方案.     

架空输电线路高速自适应单相重合闸技术

提出了基于可变间歇时间控制的高速自适应单相重合闸方案,在简述重合闸物理机理的基础上,设计了一种混合方案进行次级灭弧来提高系统的稳定性。通过对间歇时间变化的适应性来提高重合闸的成功率,利用初始断路器开路后的电压瞬变波形模式推导灭弧时间的均方根值跟踪方法,最后在750 kV架空输电线路系统上进行了多种故障位置的测试。结果表明：所提出的方案可以显著地减少次级电弧的灭弧时间,加速输电系统在瞬态故障条件下重合闸的正常运行,并且基于可变间歇时间控制的自适应单相重合闸方案可以作管理高压输电运行的有效方法。     

相控断路器分闸相角检测研究

针对南方电网某供电局10kV无功补偿电容器故障率较高的问题,拟在南方电网某110kV变电站采用分相投切电容器组,抑制合闸涌流和减小分闸重燃概率.分相分合闸技术的实现需要较高的相位检测精度.根据南方电网某110kV变电站运行数据,在MATLAB中建立仿真模型.采集变压器二次侧10kV处电压信号时长为1s,通过相关分析(扫...     

贵阳电网110kV线路优化保护配置及整定计算的探讨

对贵阳地区电网运行现状的分析，针对其110kV线路保护的配置情况和整定计算，提出了优化方案。方案中，通过对110kV线路配置光纤电流差动保护，强化主保护，简化后备保护的整定原则，能够进一步提高110kV线路保护可靠性，有效地减轻维护工作难度，提高继电保护整定计算的工作效率，对运行方式的安排也提高了灵活性。     

重合闸拒动引起开关非全相运行原因分析

分析220kV乐凤线重合闸拒动引起开关非全相运行事故的原因,并提出相应的解决措施。     

一起较为特殊的主变及线路保护动作原因分析

针对一起变电站的110kV主变保护和35kV线路保护相继动作跳闸事件展开了分析，通过事故调查发现其存在2个实际故障点，分别位于110kV主变保护动作区，l,XTL35kV线路保护动作区。在分析这种较为复杂的故障时，思路要清晰，不要互相影响。     

煤矿35 kV线路防雷保护间隙的研究

为验证保护间隙对35kV线路的防雷保护效果,在ATP-EMPT电磁暂态分析软件环境下,以某矿区35kV架空线路为模型,模拟雷击入侵35kV变压器,对比加装保护间隙前后变压器高压侧过电压峰值,结果表明,35kV线路在遭受单相或三相雷击后,保护间隙能够大幅降低变压器高压侧的雷电侵入波峰值;分析了加装防雷保护间隙后35kV线路的耐雷水平与雷击跳闸率,结果表明线路耐雷水平降低,雷击跳闸率上升,但均符合DL/T 620—1997要求。应用结果表明,煤矿35kV线路安装防雷保护间隙后能够有效抑制雷电波入侵变电装置,但需配合自动重合闸装置,以提高线路防雷的可靠性。     

110kV输电线路综合防雷措施探究

全面改善110 kV输电线路的防雷能力是保障可靠供电的重要任务。本文研究分析了雷电对110kV输电线路的危害,并根据110kV输电线路的实际应用特点提出了综合防雷措施,以期对全面改善110 kV输电线路的防雷能力能够有所借鉴。     

线路断线引发多个110kV变电站失压原因分析及反措建议

介绍一起导致多个110kV变电站失压的事故。事故的起因是一条110kV线路A相线夹脱落，导致该线路缺相运行，使得继电保护装置和安稳系统先后动作，随即造成多个110kV变电站相继失压。分析计算表明，采取综合反事故措施，可以减小此类事故的停电范围。     

空间·创意·精神——从传统而来,向时代中去

每个国家、地区与民族的建筑环境设计都有自己的风格个性和辉煌成就。摆在设计师今天的责任,就是研究如何继承和创新,这是每个设计师、艺术家责无旁贷的。现代环境艺术设计,只能走中国现代之路,立足于我们自己基础之上的实践过程。从传统而来,向时代中去,本质讲一切继承都是为了创新,因而继承只有植根于本民族的土壤之中,才能有生机,并对社会的创造保持文化发展的连续性,科学地运用传统的创作思想来启发、创意环境艺术设计。     

国内外标准法规比对分析系统设计与实现

为发现我国国家标准与国外发达国家标准法规的差距,从根本上提高我国国家标准的总体质量,提升我国产品的质量安全水平,以关键指标(因子)为核心,研究国内外标准法规比对的工作流程,利用面向对象的方法设计,实现了国内外标准法规比对分析系统。该系统适用于所有产品国内外标准法规的比对工作。     

交互式电子白板在课堂教学中的应用

本文通过交互式电子白板和之前教育方式的对比,以及交互式电子白板在历史课堂上的种种合适的应用,描绘了一个高效的,生动活泼的,师生相长相宜的新兴历史教学法。     

Study and application of temporal index technology

This paper addresses the mathematical relation on a set of periods and temporal indexing constructions as well as their applications. First we introduce two concepts, i.e. the temporal connection and temporal inclusion, which are equivalence relation and preorder relation respectively. Second, by studying some basic topics such as the division of “large” equivalence classes and the overlaps of preorder relational sets, we propose a temporal data index model (TDIM) with a tree-structure consisting of a root node, equivalence class nodes and linearly ordered branch nodes. Third, we study algorithms for the temporal querying and incremental updating as well as dynamical management within the framework of TDIM. Based on a proper mathematical supporting, TDIM can be applied to researching some significant practical cases such as temporal relational and temporal XML data and so on. Supported by the National Natural Science Foundation of China (Grant Nos. 60373081, 60673135), the Natural Science Foundation of Guangdong Province (Grant No. 05003348), the Program of New Century Excellent Person Supporting of Ministery of Education of China (Grant No. NCET-04-0805)     

High Resolution Tracking of Non-Rigid Motion of Densely Sampled 3D Data Using Harmonic Maps

We present a novel automatic method for high resolution, non-rigid dense 3D point tracking. High quality dense point clouds of non-rigid geometry moving at video speeds are acquired using a phase-shifting structured light ranging technique. To use such data for the temporal study of subtle motions such as those seen in facial expressions, an efficient non-rigid 3D motion tracking algorithm is needed to establish inter-frame correspondences. The novelty of this paper is the development of an algorithmic framework for 3D tracking that unifies tracking of intensity and geometric features, using harmonic maps with added feature correspondence constraints. While the previous uses of harmonic maps provided only global alignment, the proposed introduction of interior feature constraints allows to track non-rigid deformations accurately as well. The harmonic map between two topological disks is a diffeomorphism with minimal stretching energy and bounded angle distortion. The map is stable, insensitive to resolution changes and is robust to noise. Due to the strong implicit and explicit smoothness constraints imposed by the algorithm and the high-resolution data, the resulting registration/deformation field is smooth, continuous and gives dense one-to-one inter-frame correspondences. Our method is validated through a series of experiments demonstrating its accuracy and efficiency.     

An embedding of Timed Transition Systems in HOL

The theory of Timed Transition Systems developed by Henzinger, Manna, and Pnueli provides a formal framework for specifying and reasoning about real-time systems. In this paper, we report on some preliminary investigations into the mechanization of this theory using the HOL theorem prover.We review the main ideas of the theory and describe how it has been formally embedded in HOL. A graphical notation of timed transition diagrams and a real-time temporal logic for requirements have also been embedded in HOL using the embedding of timed transition systems. The proof rules proposed by Henzinger et al have been verified formally and we illustrate their use, as well as some problems we have encountered, by reference to a small example. More work is required on interfaces and proof methods to have a generally usable system.     

Type inference of SELF: Analysis of objects with dynamic and multiple inheritance

We have designed and implemented a type inference algorithm for the SELF language. The algorithm can guarantee the safety and disambiguity of message sends, and provide useful information for browsers and optimizing compilers. SELF features objects with dynamic inheritance. This construct has until now been considered incompatible with type inference because it allows the inheritance graph to change dynamically. Our algorithm handles this by deriving and solving type constraints that simultaneously define supersets of both the possible values of expressions and of the possible inheritance graphs. The apparent circularity is resolved by computing a global fixed-point, in polynomial time. The algorithm has been implemented and can successfully handle the SELF benchmark programs, which exist in the ‘standard SELF world’ of more than 40,000 lines of code.     

矿物与岩石的可见-近红外光谱特性综述

矿物和岩石的系统光谱学研究是当今高光谱遥感发展的基础。在简要介绍了吸收光谱产生的电子过程和振动过程机理后,系统归纳了主要矿物类型和岩石类型的可见-近红外光谱特征。认为矿物的吸收光谱主要由二价、三价铁离子和过渡族元素的电子跃迁以及晶体场效应等电子过程产生;此外,还可以由水分子、Al-OH、Mg-OH、碳酸根的振动过程及卤化物的色心和硫化物的导带产生;岩石的吸收光谱都是杂质、包体、蚀变及替代成分产生的,主要为铁、水和羟基、碳酸根、硼酸根的光谱。最后指出,不同物理、化学环境下的矿物光谱特征变异研究在将来的高光谱遥感地质勘察中将变的更为重要。     

A fuzzy analysis of country-size argument for the Feldstein-Horioka puzzle

This study aims to analyze the effect of country size, represented by relative Gross National Products (GNP), on the association between domestic investment and saving, using data from a panel of 21 OECD countries. The countries are clustered into four groups with respect to their relative country sizes with an application of Fuzzy c-Means clustering technique. The novelty of this approach is that it is an unsupervised method that generates membership values between zero and one instead of binary values that take values of zero or one only. In addition to this it has the advantages of its tolerance to imprecise data and the ease of understanding. The results show that the saving retention coefficients are greater for larger countries except for the cluster which contains the largest country. Thus, this work presents only partial evidence that the country size affects the relationship of domestic saving and investment.     

测控任务并发调度管理的研究与设计

论文分析了测控系统中测控任务的特点,据此提出了测控任务的并发调度管理方法,介绍了测控任务并发调度管理模型、测控任务的表示要素、任务管理的操作以及这些操作的设计方法。