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关键词： 开关能力   验收规范   交流电流   交流开关   辅助电路   元部件   触点   连续性试验   交货条件   设计   介质材料   尺寸选定   接地   接地开关   电气工程   电阻   电气安全性   频率   加热   高电压   高压电器   高电压技术   户内   绝缘水平   绝缘件   隔离开关  

标准号: IEC 62271-102 AMD 2-2013

关键词： 高电压技术   电子信箱   电子邮件   期刊网站  

摘要： 各位专家、作者、读者:因《高电压技术》第1主办单位由国网电力科学研究院变更为中国电力科学研究院,故自2013年起期刊网站由原http://***变更为http://***,电子信箱由原hve@sge-

关键词： 高电压技术   专家  

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： 高电压   绝缘技术   预防性试验  

摘要： 阐述了高电压技术中电气设备的绝缘诊断和电气设备预防性试验，叙述了预防性试验的分类，并对绝缘诊断的方法及预防性试验的设备、仪器进行分析和探讨。

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： 局部放电   射频信号   放电量   高电压技术  

摘要： Converter transformers are one of the most important electrical apparatuses in the ultra high voltage(UHV) DC transmission *** valve side and the low voltage(LV) bushing are stressed by long-term AC and DC composite voltage leading to significant partial discharge(PD) and posing great danger to the insulation *** this paper AC and DC composite voltage is applied on a metal needle-plate model to produce PD signal sequences,and then the pulse waveshape and frequency spectrum are analyzed and compared with PD signals under conventional AC or DC *** the end,the phase-resolved distribution is analyzed to depict the new characteristics of PD under this composite voltage.

关键词： 局部放电   射频信号   放电量   高电压技术  

摘要： This paper proposes an effective method for over-voltage classification based on the Hilbert-Huang transform(HHT) ***-Huang transform method is composed of empirical mode decomposition(EMD) and Hilbert *** kinds of common power system over-voltages are calculated and analyzed by *** on the instantaneous amplitude spectrum,Hilbert marginal spectrum and Hilbert time-frequency spectrum,three kinds of over-voltage characteristic quantities are obtained.A hierarchical classification system is built based on HHT and support vector machine(SVM).This classification system is tested by 106 field over-voltage signals,and the average classification rate is 94.3%.This research shows that HHT is an effective time-frequency analysis algorithms in the application of over-voltage classification and identification.

关键词： 局部放电   射频信号   放电量   高电压技术  

摘要： This work studies the feasibility of implementing a system for diagnosis of electrical insulation in the field based on ultrasonic noise and artificial neural *** system,proved functional under laboratory conditions,extracts spectral information from the ultrasonic noise emitted by the corona discharges in electric equipments,and correlates it with previously defined degrees of *** achieve this classification,artificial neural networks are *** results show the viability of the method in the site;nevertheless they also show that its reliability is proportional to the size and diversity of the available database.

关键词： 局部放电   射频信号   放电量   高电压技术  

摘要： The converter transformer is one of the most critical equipments in high-voltage direct current transmission ***-side windings have to withstand complex stresses combined of AC,DC,and pulsed *** discharges(PDs) can thus easily occur in oil-impregnated paper *** current paper presents the statistical phase-resolved distributions of partial discharges in oil-paper insulation under combined AC and DC voltage ***,the voltages in the converter transformer were *** the experiments,four artificial insulation defect models were designed to generate PD signals under AC-DC combined voltage stress detected by a Rogowski coil *** including the φ-q-n data of these PD signals were *** variations of φ-q-n data generated by PDs in different insulation defect models were analyzed while increasing the test *** results showed that the PD phase-resolved distributions of different insulation defect models were different from one *** findings of the current study are useful in further research on the mechanism and pattern recognition of PDs in converter transformers.