浅谈10kV配电设计

一般情况下,按变压器的效率最高时的负荷率βM来计算变压器容量,计算负荷最好是2倍总功率P总,留有一定的缓冲空间,而母线采用的材料为铜、铝、钢或其他金属。电缆绝缘材料应根据电缆绝缘材料的种类来选用,电缆截面的选择应特别注意电缆允许载流量与敷设环境的温度。     

有效降低110kV变电站地网接地电阻的方法

文章就如何经济、有效地降低110kV变电站地网接地电阻的问题进行分析，并通过施工实践给予介绍。     

500kV狮洋至五邑同塔四回线路的设计情况

500kV狮洋至五邑线路工程是南方电网第一条500kV同塔四回线路,同塔四回西江大跨越在全世界尚属首例。文章论述该工程采用同塔四回线路的必要性,然后介绍专题研究和试验研究的相关情况。     

10kV变电站的电力施工技术浅探

简介变电站的设计以及结合实际,简要的探析了10kV变电站的电力施工技术。     

浅谈电力系统继电保护

城市电网配电系统由于其覆盖的地域极其辽阔、运行环境极其复杂以及各种人为因素的影响,电气故障的发生是不能完全避免的。在电力系统中的任何一处发生事故,都有可能对电力系统的运行产生重大影响。为了确保城市电网配电系统的正常运行,必须正确地设置继电保护装置。     

浅析35kV变电站直流系统改造方案

随着科技和管理的进步,变电站直流系统正朝着自动化和免维护的方向发展,对直流系统要求的不断提高使得直流系统的改造势在必行,本文从分析当前35kV变电站直流系统存在的问题入手,以此提出改造目标,并对直流系统的改造措施进行简要分析。     

110kV高压输电线路工程的技术要点分析

110kV高压输电线路是电力系统的重要组成部分,担负着输送和分配电能的任务,并联络各发电厂、变电站使之有效运行。近年来,对110kV高压输电线路工程的质量要求比过去更加严格、规范,而电力行业的建筑施工部分是一项多工种、多专业的复杂的系统工程,尤其是具有专业性强、施工难度大、建设周期短等特点。本文对110kV高压输电线路工程的技术要点进行了一些相关探讨。     

The zero-information-limit condition and spurious inference in weakly identified models

In many econometric models the asymptotic variance of a parameter estimate depends on the value of another structural parameter in such a way that the data contain little information about the former when the latter is close to a critical value. This paper introduces the zero-information-limit-condition (ZILC) to identify such models where ‘weak identification’ leads to spurious inference. We find that standard errors tend to be underestimated in these cases, but the size of the asymptotic t-test may either be too great (the intuitive case emphasized in the ‘weak instrument’ literature) or too small as in two cases illustrated here.     

Do better institutions offset the adverse effect of a financial crisis on investment? Evidence from East Asia

We extend the neoclassical investment theory to capture the deviation of current institutional quality from its ideal level. We show that an improvement in institutions increases the speed of adjustment towards desired capital stock and the marginal product of capital and hence enhances the investment demand. Next, we apply our theoretical model to East Asia. Using Generalized Method of Moments, we estimate a dynamic panel data model to investigate the effect of alternate measures of institutional quality on investment dynamics in this region. Our findings underline the role of institutions as a deep determinant of investment. We also conclude that the East Asian countries with better institutional quality are less prone to the adverse effects of financial crises on their fixed capital formation. Our results are robust to the estimation methods and changes in institutional measures and hence might have important policy implication for policymakers and investors in East Asia.     

关于750kV输变电工程造价管理的分析与研究

在电网建设中工程造价管理已成为电网建设管理的内容之一,本文作者通过对750kV输变电工程总体造价原因进行了分析,同时对750kV输变电工程造价管理措施做了阐述。