500kV CVT不拆高压引线预试方法探讨

分析了５００ｋＶ 变电所两类安装位置的ＣＶＴ不拆线预试,探讨了不拆线对线路侧ＣＶＴ测试的影响。     

500kV电容式电压互感器不折高压引线预试方法探讨

对５００ｋＶ变电所两种安装形式的ＣＶＴ不拆线预试方法进行了分析,特别对线路侧ＣＶＴ不拆线对测试的影响作了探讨。     

50kV电容式电压互感器不拆高压引线预试方法探讨

对５００ｋＶ变电所两种安装形式的ＣＶＴ不拆线预试方法进行了分析,特别对线路侧ＣＶＴ不拆线对测试的影响作了探讨。     

500KV电容式电压互感器不拆高压引线预试方法探讨

对５００ＫＶ变电所２种安装形式的电容式电压互感器,不拆线预试进行了分析, 特别坚线路侧ＣＶＴ不拆线对测试的影响作了探讨。     

500 kV CVT现场不拆线tgδ试验及分析

５００ｋＶＣＶＴ现场不拆线ｔｇδ试验及分析绍兴电力局（绍兴３１２０１６）张国强５００ｋＶ电气设备的绝缘预防性试验需拆除高压引线进行，停役时间长，工作量很大，且安全性差，是一个函需解决的问题。现将我局５００ｋＶＣＶＴ不拆高压引线的ｔｇδ测量试验方法及分...     

电容式电压互感器1/2次分频谐波的分析

电容式电压互感器（ＣＶＴ）目前正常运行在大电流接地系统中，但在特定的操作下，可能运行于不接地系统。随着ＣＶＴ使用量的增大，使这种可能性增大。文中分析ＣＶＴ运行于不接地系统方式下，产生１／２次分频谐波谐振的条件，并用描述函数分析谐振域的可能范围以及对ＣＶＴ性能的影响。     

电容式电压互感器暂态响应的数字仿真研究

本文对电容式电压互感器（ＣＶＴ）的暂态特性进行了数字仿真,并对影响ＣＶＴ暂态特性的各种因素进行了分析,研究了ＣＶＴ的暂态响应过程给基于全波傅氏算法的微机保护带来的影响,同时对超高压输电线中串补电容的投入对ＣＶＴ暂态响应的影响进行了分析研究。     

500kVCVT的现场角比差校验

５００ｋＶ、２２０ｋＶ变电站中，电容式电压互感器（ＣＶＴ）安装前，或运行中出现问题后应进行精度测量。文章介绍了现场进行ＣＶＴ精度校验的方法（现场角比差校检）；分析了实现角比差校验需要解决的问题。通过对标准ＣＶＴ误差因素的分析，拟定了检测标准ＣＶＴ不同接地环境和不同高压引线情况下可能产生的角比差的模拟试验方案。采用该法可以精确地在现场测量５００ｋＶＣＶＴ的角差和比差。     

CVT中压变压器优化设计计算

为了提高电容式电压互感器（以下简称ＣＶＴ）的额定容量及测量精度，对ＣＶＴ中压变压器的优化设计进行了研究，并在此基础上编制了中压变压器优化设计计算软件，最后对影响变压器漏抗从而影响ＣＶＴ精度的因素进行了研究。     

电容工电压互感器暂态响应的数字仿真研究

本文对电容式电压互感器的暂态特性进行了数字仿真,并对影响ＣＶＴ暂态特性的各种因素进行了分析,研究了ＣＶＴ的暂态响应过程给基于全波傅氏算法的微机保护带来的影响,同时对超高压输电线中串补电容的投入对ＣＶＴ暂态响应的影响进行了分析研究。     

电容型电流互感器不拆高压引线的预防性试验方法

论述了电容型电流互感器不拆高压引线预防性试验的原理和方法,并介绍了现场实际测试结果,证明该方法是准确、高效,切实可行的。     

Development and applications of lightning arresters fortransmission lines

A lightning arrester with a series gap for transmission lines has been developed to prevent faults due to lightning. It has shown excellent performance since 1986 on 77 kV service lines in heavy lightning regions. A 275 kV lightning arrester has also been developed, and a field test was started on a service line in 1988. The authors describe the requirements for lightning arresters for transmission lines, design concepts, specifications, and operational records on the 77 kV lines for three years. The gapped-type lightning arrester is considered the most practical given the existing technology. To obtain light and small lightning arresters, an ethylene-propylene rubber shed was adopted for external insulation and a special pressure relief mechanism was introduced in place of the pressure relief guide of the station arresters. The follow current can be cut off within a period of 0.25 to 0.5 cycles even under contaminated and wet conditions     

基于面保护原理的开闭所保护

章在综述了开闭所保护现状后，引入面保护原理，结合现场总线网给出了在开闭所保护上应用的判据，以及在10kV实验室的试验结果。试验证明将面保护原理应用于开闭所的保护是成功的，当线路发生短路故障时，它可在0．3s内判断出故障是发生在某回出线上还是某段母线上，并可分别正确给出各进线断路器、出线断路器的动作出口。     

基于PDA的输电线路无漏巡视方案

保证输电线路运行状态的巡视到位率是目前亟需解决的问题。根据输电线路巡视原理,分析了影响输电线路巡视效率的原因。根据我国输电线路巡视管理现状,以地理信息系统(GIS)为基本平台,以定位导航技术(GPS)作为技术手段,提出了输电线路无漏巡视方案,将基于射频识别技术(RFID)的PDA手持机应用于输电线路巡视管理系统,有效提高输电线路巡视工作的到位率。     

An energy approach to analysis of interarea oscillations in powersystems

In this paper, an energy approach to analysis of interarea oscillations (IAO) in power systems has been developed. IAO is characterized as oscillatory behavior, following a disturbance, of the rotor motion for two or more generator groups such that there is a periodic interchange of energy between them. By comparing the phase of the coefficient of the dominant energy mode in the kinetic energy for each generator, we identify the groups for which there are periodic interchanges of energy. The location of these groups in the system provides insight regarding transmission lines over which the energy interchange is taking place. Numerical results are obtained using a test system similar in structure and characteristics to that of the WSCC system in North America. Time domain simulation indicates installation of thyristor controlled series capacitors in key transmission lines identified using the results of the energy analysis provides an effective control for damping IAO     

电力线路小分段绝缘防雷措施研究

雷电活动较强的地区雷害已成为当地电力线路跳闸的主要原因,但常用的防雷措施难以达到良好的防雷效果。通过对我国南方某地区雷害情况的统计分析,以及对其常用的多种防雷措施的对比与效果研究,提出了电力线路小分段绝缘防雷措施,阐述了该措施的实施方法,并以实际改造案例验证了该措施的有效性。     

500kV及以上输电线路耐张引流板快速检修装置

介绍了一种超高压输电线路耐张引流板快速检修专用工具,通过分析机械强度及电气参数选型确定结构,研制引流板快速检修专用工器具。对快速检修装置的性能及经济效益进行了分析研究,经各项强度测试实验和与人工消缺时间对比,该装置可有效降低跳线滑脱掉落的安全风险,解决现场安装就位困难、作业时间长、极大耗费体力等问题。     

110 kV贵同大线路不明闪络原因分析

110kV贵-同-大线路于1998年12月投入运行以来,多次发生跳闸事故,严重影响安全运行。文章对贵-同-大线路跳闸原因从现场调查、试验分析等多方面进行了论述,通过分析,得出了各工况下的电气间隙值、最小悬垂绝缘子串绝缘长度、最小悬垂串全长及片数的技术数据,对不同海拔高度线路间隙值及绝缘长度进行修正和外延。并提出解决措施。     

适用于平行双回线路的零序距离继电器研究

提出了适用于平行双回线路的零序距离继电器新判据.研究表明,当本回线路发生单相接地短路时,在通过公式计算得出的一特定值为正时,离保护安装处越远,本回线路零序电流与非故障线路零序电流相位差值越小;当另一回线发生单相接地短路时,离保护安装处越远,本回线路零序电流与故障线路零序电流相位差值越大,该值为负时则反之.因此可以利用双回线路中的零序电流相位差值的变化趋势来识别故障线路.由于采用零序电量作为判断依据,新方法具有受两侧电源角度的影响小,且受负荷、系统运行方式的因素影响小的特点.大量ATP仿真试验证明新方法对于双回线出现的单相接地故障, 具有足够的灵敏度.     

The competitive assessment laboratory: introducing engineering design via consumer product benchmarking

In today's quickly changing and increasingly competitive market place, it is imperative that manufacturers keep abreast of the technological advances and design innovations incorporated into competing product lines. The term competitive assessment (or benchmarking) has been coined by manufacturers to describe the process of ethically acquiring, inspecting, analyzing, instrumenting, and testing the product lines of other manufacturers. The Competitive Assessment Laboratory at Rowan University is funded by the National Science Foundation (NSF). In the laboratory, multidisciplinary teams of freshman engineering students from each of the four engineering departments perform each of the above tasks on a consumer product. The laboratory contains a series of consumer appliance test stations featuring PC-based data acquisition systems capable of measuring thermocouple and voltage/current signals. Each station is also equipped with mechanical measurement equipment and portable materials testing equipment. In addition to introducing students to the science and art of design, the Competitive Assessment Laboratory enables the faculty to assess the constantly evolving initial conditions under which the typical engineering student enters his or her course of study.