检索结果-南通市图书馆

Shaping future low-carbon renewable energy systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

iEnergy 2022年第3期1卷 267-268页

作者： jinliang he Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

The third issue of iEnergy contains 3 news and views articles,3 highlights,1 letter,4 review articles,and 4 original research *** new power system with large-scale access to renewable energy has a high degree of randomness on both supply and demand *** energy,such as wind energy and solar energy,has the characteristics of non-storability and fluctuation as a primary energy,which causes the power generation output of renewable energy to be highly uncertain and the controllability of the power system supply side to be *** new energy power system requires fundamental changes in the structure and operation mode of the power system so that the power system can tolerate the impact of uncertainty in supply and demand and realize the safe and effective use of renewable energy.

关键词： energy system letter

ZnO varistors with high voltage gradient and low leakage current by doping rare-earth oxide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2008年第6期51卷 693-701页

作者： he jinliang HU Jun LIN YuanHua Sate Key Lab of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Key Lab of New Ceramics and Fine Processing Department of Material Science and EngineeringTsinghua UniversityBeijing 100084China

The surge arrester of 1000 kV gas-insulated substation (GIS) needs ZnO varistor with high voltage gradient to effectively improve the potential distribution along ZnO varistor column inside the metal-oxide surge arresters. In this paper, the elec-trical and structural parameters of ZnO varistors are changed by doping with some rare-earth oxides, and the mechanism which leads these changes is discussed. When rare-earth oxide additives are added into ZnO varistors, the growing speed is slowed down due to the stabilization of the new spinel phases formed in the grain-boundary by rare-earth oxide additives, then the size of ZnO grains is smaller, and the voltage gradient of varistor increases obviously. By adding suitable amount of oxides of metal Co and Mn, the leakage current can be effectively decreased and the nonlinearity coefficient increased. The novel ZnO varistor samples sintered with the optimal additives have a voltage gradient of 492 V/mm, and the nonlinearity coefficient of 76, but their leakage currents are only 1 μA.

关键词： ZnO varistors rare-earth oxide U-I characteristics voltage gradient leakage current nonlinear coefficient spinel

Increasing the utilization efficiency of electrical power energy

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

iEnergy 2023年第2期2卷 85-86页

作者： jinliang he Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

The second issue of iEnergy in 2023,which published ten papers,including two news and views,two highlights,one letter,three review articles,and two original research *** June enters midsummer,characterized by scorching tem-peratures,several regions have issued yellow warnings owing to high *** some areas,the temperature is as high as 40°C,resulting in a substantial surge in residential electricity *** the containment of the pandemic,enterprises have resumed operations at full capacity,leading to a peak in elec-tricity *** and heat are inseparable;with rising living standards,air conditioning has become an essential component of the *** recent years,the energy burden attributed to air conditioning during summer has been increasing,accounting for an increasing proportion of the highest power *** some cities in Southern China.

关键词： operations resume attributed

Facing the challenges of new-type power systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

iEnergy 2022年第2期1卷 141-142页

作者： jinliang he Department of Electrical Engineering Tsinghua University

On the morning of April 23,2022,at the 90th-anniversary celebration of the Department of Electrical Engineering at Tsinghua University,the inauguration ceremony of the international academic journal iEnergy was *** second issue of iEnergy arrived,publishing 14 papers,including three news and views,two highlights,one letter,four review articles,and four original research articles.

关键词： journal academic letter

Fault detection,classification and location for transmission lines and distribution systems:a review on the methods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2016年第1期1卷 25-33页

作者： Kunjin Chen Caowei Huang jinliang he State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China

A comprehensive review on the methods used for fault detection, classification and location in transmissionlines and distribution systems is presented in this study. Though the three topics are highly correlated, the authors tryto discuss them separately, so that one may have a more logical and comprehensive understanding of the conceptswithout getting confused. Great significance is also attached to the feature extraction process, without which themajority of the methods may not be implemented properly. Fault detection techniques are discussed on the basis offeature extraction. After the overall concepts and general ideas are presented, representative works as well as newprogress in the techniques are covered and discussed in detail. One may find the content of this study helpful as adetailed literature review or a practical technical guidance.

关键词： fault distribution comprehensive

Explore the positioning,connotation and characteristics of newtype power system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

iEnergy 2023年第3期2卷 155-156页

作者： jinliang he Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

The third issue in 2023 of iEnergy comes,which published 12 papers,including 3 news and views,3 highlights,1 letter,2 review articles,and 3 original research articles.

关键词： letter characteristics system

Building renewable energy delivery channels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

iEnergy 2022年第4期1卷 383-384页

作者： jinliang he Department of Electrical Engineering Tsinghua University

The fourth issue of iEnergy has arrived,with ten papers published,including three news and views,two highlights,one letter,two review articles,and two original research *** global distribution of clean energy is *** Arctic,northern Europe,central North America,central and northern Asia,eastern Africa,and coastal areas on all continents receive the majority of wind energy,while the Middle East,Oceania,Central and South America,North Africa,East Africa,and other areas near the equator receive the majority of solar energy.

关键词： northern coastal Arctic

Dependence of residual voltage ratio behavior of SnO_2-based varistors on Nb_2O_5 addition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2011年第6期54卷 1415-1418页

作者： WEI QiaoYuan he jinliang HU Jun State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China

SnO2-based varistor samples doped with Co2O3,Nb2O5 and Cr2O3 were prepared by ball-mixed oxide *** microstructure,nonlinear I-V characteristic and surge current performances of these samples were *** paper mainly focused on the dependence of the residual voltage ratio behavior of SnO2-based varistors on Nb2O5 addition,different factors influencing the residual voltage ratio in different concentration of Nb2O5 were *** Nb2O5 addition influences its residual voltage ratio by changing the grain size,forming defects(especially the free electrons) and cumulative *** measured results indicated that the optimally obtained sample with 0.07mol% Nb2O5 possesses the lowest residual voltage ratio of 1.86,the corresponding nonlinear coefficient and the threshold electric field are 42.6 and 364.6 V/mm,respectively.

关键词： SnO2-based varistor Nb2O5 residual voltage ratio

Design of adaptive bushing based on field grading materials

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High Voltage 2021年第4期6卷 625-636页

作者： Xiaolei Zhao Jun Hu Zhikang Yuan jinliang he State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University BeijingChina

Electrical bushings,as important power system components,are critical to the reliability of power *** capacitance-graded bushing is a type of high voltage bushing that is most commonly used in current power ***,the limitations of and problems with capacitance-graded bushings are exposed when the operating voltage level increases.A new direct current wall bushing with adaptive field grading materials is proposed,based on the core features of the problem that the bushing is intended to *** main insulation structure of the proposed DC wall bushing with adaptive field grading materials comprises three parts:a field grading layer,a current limiting layer and an electrode extension *** proposed bushing has characteristics that include a simple structure,small size and environmental friendliness,and it also meets the re-quirements of existing power *** proposed bushing also conforms to the intended development direction for future power equipment and will aid in the devel-opment of power systems for operation at higher voltages.

关键词： insulation structure limiting