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关键词： 局部放电   射频信号   放电量   高电压技术  

摘要： The aim of this paper was to give an overview on partial discharges under oscillating impulse *** models(void in solid,needle-plate in air and oil) were presented,which describe the stochastic discharge process and represent internal discharges in solids and corona in air or silicon ***,an air cored Rogowski coil and a sampling resistor for partial discharge(PD) measurement were developed and introduced in this *** inception and extinction voltages(PDIV,PDEV) under single oscillating impulse voltage and AC voltage were investigated with different test *** results firstly revealed that the PD inception voltage(PDIV) decreased with increasing applied voltage;secondly the PD inception voltage for three different insulating materials,showed an escalating trend with increasing frequency of the applied *** was proven that the characteristics of PD under oscillating impulse voltage were identical to the features under AC voltage,which could be measured with the phase resolved partial discharge analysis(PRPDA) *** on the reorganization and analysis of PDs under oscillating impulse voltage,the information about insulation defects was extracted from the measured data and used for estimating the risk of insulation failure of the equipment.

关键词： 局部放电   射频信号   放电量   高电压技术  

摘要： Lightning electromagnetics can affect the reliability of the power system or communication ***,evaluation of electromagnetic fields generated by lightning return stroke is *** sommerfeld proposed a model to calculate the electromagnetic field,but it involved the time-consuming sommerfeld ***,perfect conductor ground assumption can account for fast calculation,thus this paper reviews the perfect ground equation for evaluation of lightning electromagnetic fields,presents three engineering lightning return stroke models,and calculates the horizontal electric field caused by three lightning return stroke *** to the results,the amplitude of lightning return stroke has a strong impact on horizontal electric fields,and the steepness of lightning return stroke influences the horizontal electric ***,the perfect ground method is faster than the sommerfeld integral method.

关键词： 局部放电   射频信号   放电量   高电压技术  

摘要： It is conducive to ensure the safety and reliability of the power system by means of timely and accurate evaluation of the reliability of large *** evaluation method of fault probability for large generators based on multi-characteristic parameters is proposed in this paper,which can be employed to solve the difficult problem of evaluating the occurrence probability of fault modes of large generators in the process of reliability ***,the set of fault characteristic parameters for a large generator is established on the basis of a large number of operation experiences and preventive test code for the large ***,according to the features of the fault characteristic parameters,two estimation methods of the fault mode occurrence probability are proposed,which are based on the fuzzy membership function and the relative deterioration degree,***,on the basis of the improved analytic hierarchy process(IAHP) method,the composite estimation method of the fault probability for a large generator is presented,which can reasonably and adequately use the information of various characteristic *** assessment case is provided to illustrate the specific process of this evaluation method and verify its effectiveness.

关键词： 华北电力大学   科学技术发展   工程技术   征稿简则   高电压技术   办刊宗旨   科技人才   研究成果  

摘要： 《电力科学与工程》是由华北电力大学主办的学术兼工程技术性期刊。国内外公开发行，月末出版。本刊以促进科学技术发展、培育科技人才为办刊宗旨。主要刊登有关发电、供电及电力企业管理方面的最新研究成果。内容包括：电力系统及其自动化、电工理论与新技术、电机与电器、高电压技术、

关键词： high voltage technologies   nanocomposites   superconductors  

摘要： Assets in high voltage technology have to meet harsh service conditions over long lifetimes of 40 years or more. Due to environmental concerns, substitution of conventional insulating materials becomes a necessity. Because robustness and sustainability are serious requirements, only few new materials are really breaking through. At present some promising material technologies emerge with great potential applicability in high voltage engineering. This paper discusses especially nanocomposites and high temperature superconductors.

关键词： 接地保护装置   高低压开关柜   电力   高电压技术   接地电极  

摘要： 简要叙述了接地保护装置的特性,介绍了低、高压开关柜接地保护装置的结构及工作原理,并就接地保护装置在高低压开关柜中的应用进行了分析评价。

关键词： 750   kV变压器   高电压技术   局部放电   绝缘水平  

摘要： 本文介绍了我国750 kV输变电示范工程中变压器现场局放交接试验的标准、程序和过程,分析了局放起始电压和熄灭电压定义中的含混之处,比较了750 kV变压器的局放试验电压值和工频耐压值、分析了局放试验中经常出现的问题。提出如下建议:①提高750 kV变压器的工频绝缘水平;②放宽变压器局放现场交接试验标准至1 000 pC;③重新定义局部放电起始电压和熄灭电压;④加强现场实用技术的研究;⑤试验人员持证上岗;⑥试验仪器定期校验;⑦必要时采用在线监测。这些建议不限于750kV变压器,也可为1000kV变压器的现场局放交接试验参考。

关键词： 特高压   直流输电   高电压技术  

摘要： 文章根据我国能源配置问题,提出我国发展特高压直流输电的必要性。分析了特高压直流输电的优点以及现存在的高电压技术问题,阐述了相关研究成果。并提出对特高压直流输电技术前景的展望。

关键词： 华北电力大学   科学技术发展   工程技术   征稿简则   电厂自动化   电力电子技术   热能动力工程   高电压技术  

摘要： 《电力科学与I程》是由华北电力大学主办的学术兼工程技术性期刊，国内外公开发行，月末出版。本刊以促讲科学技术发展、培育科技人才为办刊宗旨，主要刊登有关发电、供电及电力企业管理方面殴最新研究成果，内容包括：电力系统及其自动化、电工理论与新技术、电机与电器、高电压技术、电力电子技术、热能动力工程、电厂自动化、现场运行经验、设备改造更新等。

关键词： 油纸绝缘   热老化试验   专利   文摘   击穿特性   高电压技术   特性对比   生成规律  

摘要： 天然酯．纸绝缘与矿物油．纸绝缘的热老化及工频击穿特性对比／廖瑞金；张爽；杨丽君；等／高电压技术，2012（04）以天然酯和矿物油分别与普通绝缘纸组成油纸绝缘试品，在11O℃和130℃下分别进行了加速热老化试验，对比分析了两种绝缘组合的老化产物生成规律和工频击穿特性。