简介：Toanalyzetheinfluenceof±400kVQinghai-TibetHVDCtransmissionsystemontransmissionlineprotectionsinQinghaiACpowersystem,aclosed-loopsimulationsystemwasconstructedbycombingHyperSimsystemwithHVDCcontrolprotectiondevices.Variousfaultsondouble-circuit750kVandmulticircuit330kVACtransmissionlinesinQinghaipowersystemweresimulated.TheimpedancecharacteristicsandharmoniccomponentsatQinghaisideofQing-TibetDCtransmissionlinewereanalyzed.TheharmonicproportioninvoltagesandcurrentswerestudiedforfaultsthattookplaceatdifferentlocationsneartheDCsystem.TheinflenceofQing-TibetDCsystemonthedirectionalcomponentsofprotections,differentialprotectionsanddistanceprotectionsofACtransmissionlineswasdiscussedanddrewtheconclusionsthattheDCsytemhadlittleinfluenceondifferentialprotections,whilehadgreatinflenceondirectionalcomponentsanddistanceprotection.TheconclusionscanprovidereferenceforstudyingtheinteractionbetweenACandDCsystems.

简介：士兰微电子在智能功率模块（IPM）领域不断推出新品，近期又发布了高度集成、高可靠性的3相无刷直流电机驱动电路SD30M60AC。模块内置了6个低损耗的IGBT芯片和6个快恢复二极管芯片以及3个高速半桥高压栅极驱动电路。

简介：84岁高龄的日本松下照明电子公司原总工，国际资深的电光源专家卡米亚博士（Dr．Kamiya），在他同事75岁的阿古佐博士（Dr．Akutsu）陪同下，于2014年4月8日-18日再次来华访问。他是上海市照明学会的境外会员，与上海照明和光源科技界有着深渊的情谊，历史上在已故的蔡祖泉教授陪同下，曾30多次来访上海，参观过多家上海照明和光源科技单位开展学术交流，