浅谈变电所接地设计与防雷

防雷是变电所设计中的一项重要内容,而防雷工程的一个重要方面是接地以及引下线的布线工程。整个工程的防雷效果甚至防雷器件是不是起作用都取决于此。本文介绍了变电所接地的目的和要求,以及防雷接地的施工措施。     

110kV室内变电所设计与改造

110kV城区变电所设计是城网建设中的关键环节。根据各地不同情况,在借鉴已建11OkV室内变电所设计经验的基础上,对11OkV室内变电所在电气主接线、电气设备选型、方面提出一系列设计思路。     

6kV无人值守变配电所综合自动化的设计

随着电力系统的飞速发展,微机保护已得到了越来越广泛的应用,本文通过对某无人值守的变电所综合自动化设计,系统地介绍综合自动化变电所保护配置和技术要求,提出了对监控系统的主要功能要求.     

35kV总降压变电所工程用电优化设计

为解决某采矿厂工程用电,拟建35/6k V总降压变电所一座,进行35k V总降压变电所的优化设计。通过负荷分组,功率因素补偿,系统主要接线及运行方式设计,短路电流计算,变压器选取和保护接地雷击漏电等安全措施处理,基本构成了采矿厂35k V变电站的设计,可以满足生产生活需要,达到安全用电要求,同时兼顾可行性、经济性、稳定性和可扩展性。     

10kV变电所电气设备的选择与校验

10kV变电所作为常见的输电线路终端,担负着受电、变压、分配的任务,是生产和生活供电系统的枢纽,其所用电气设备的正确选择是供配电系统安全、可靠运行的基本保证。本文针对10kV变电所的设计问题,介绍了10kV变电所电气设备的选择方法,并结合实际工程经验,从实际工程数据进行分析,证明了本文方法的可行性和实用性。     

长轨焊接基地10kV变配电所设计

10kV配电所及10/0.4kV变电所设计,是工程建设中非常普通又非常重要的一项工作,其规范性和技术性都很强,许多方面涉及到国家强制性条文的贯彻落实。要做好变配电所设计既要执行国家现行的有关规范和规程,又要满足当地供电部门的具体要求,否则会出现种种问题,影响设计质量和工程进度。本文结合实际工程简要介绍了铁路长轨焊接基地10kV配电所及10/0.4kV变电所所址选择、变压器台数及容量确定、室内设备布置及选择等的设计,对工程技术人员进行10kV变配电所的设计具有一定借鉴意义。     

一个变电所方案的推敲

本文以一个变电所方案的方案推敲为例，较为详细的分析、阐述了如何既符合规范要求，又符合当地实际，同时力求满足客户需求的变电所设计。     

结合实例浅谈变电所综合自动化系统设计

结合对彭州市电力局综合办公大楼变电所综合自动化系统的设计方案, 介绍了变电所综合自动化系统的设计原则、技术特点和系统构成, 并总结了变电所综合自动化系统的安全性措施, 旨在为变电所综合自动化系统的设计提供参考.     

35kV变电所安装施工中的质量控制

目前，35kV等级变电所普遍由企业自建接入电网，为确保电网的安全运行和企业的用电可靠性，对35kv变电所的安装施工质量也相应地提出了严格的要求。现根据35kv变电所的安装过程，对安装过程中的质量控制作一探讨。     

埃塞俄比亚GM-1工程GONDER变电所自动化改造

本文以埃塞俄比亚230kV GM-1工程GONDER变电所自动化改造为例,介绍了埃塞俄比亚国家电网的实际现状,以及我公司对GONDER变电所进行扩建和自动化改造。由于埃塞俄比亚国家电力公司调度中心的建成,要求对本期扩建部分及在原有一次设备和二次继电保护装置的充分利用基础上,增加遥信采集装置、遥控装置、遥测采集装置,使之具备四遥功能。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-