简介:InordertoeffectivelyimitatethedynamicoperationcharacteristicsoftheHVDC(highvoltagedirectcurrent)powertransmissionsystematareal±500kVHVDCtransmissionproject,theelectro-mechanical-electromagnetictransienthybridsimulationwascarriedoutbasedonadvanceddigitalpowersystemsimulator(ADPSS).Inthesimulationanalysis,thebuilthybridmodel'sdynamicresponseoutputsunderthreedifferentfaultconditionsareconsidered,andbycomparingwiththeselectedfaultrecordingwaveforms,thevaliditiesofthesimulationwaveformsareestimatedqualitatively.ItcanbeascertainedthatthehybridsimulationmodelhastheabilitytodescribetheHVDCsystem'sdynamicchangetrendswellundersomespecialfaultconditions.
简介:目前,柔性线路板(FPC)的焊盘及表面阻焊膜(SolderMask)制造工艺有两种方法使用较为广泛。一种是采用聚酰亚胺薄膜(PI膜:Polyimide)为材料,在对应焊盘位置进行激光切割、使对应位置白勺铜箔漏出来后进行表面处理(SurfaceFinish)而成为焊盘:另外一种则是采用光致涂覆层(PIC:PhotolmageableCovercoat或称PSC:PhotoSensitiveCoat),