The single phase grounding fault location is the focus which researchers pay attention to and study in the small current grounding power systems . with the improvement of automatic level in distribution systems , the study about it is urgent daily 小电流接地系统单相接地故障定位一直是人们关注和研究的焦点,随着配电网自动化水平的提高,对其研究的迫切性已日益紧迫。
In recent years , many cement producing lines with new technology and advanced automatic level have been built up in our country . this implies that a great deal of workers and engineers with high abilities should been trained continuously 近年来,我国已经建成许多新型干法水泥生产线,这些生产线技术新、自动化水平高,这就意味着水泥行业需要不断培训出大批合格的生产操作人员和工程技术人员。
But the automatic level of toll - collection on the highways remains comparatively underdevelopment by contrast with the construction of highways , which causes the situation of heavy traffic more and more serious , and that the driving speed on the highway has been greatly reduced 但是,与高速公路建设相比,公路收费的自动化水平却相对滞后,造成收费站前车辆拥挤,交通堵塞现象日趋严重,大大降低了高速公路的通行速度。
Shouda commits itself to the innovation of packaging cause to promote the packaging quality and automatic level of all kinds of products and hope to make necessary contribution in the promotion of products packaging quality and packaging cause both of china and the world 首达公司以致力于包装事业的创新,提高各类产品包装质量及包装自动化程度为己任,希望为中国及全世界的产品包装事业和产品包装品质的提高做出自己应有的贡献。
Measurement precision contribute to improving the security class and economic of boiler running and automatic level of whole plant . the smart measurement instrument of the boiler ’ s air flow designed in the thesis and the instrument can make the degree of accuracy get to . firstly , the thesis build the “ velocity - area ” method which is on basis of “ log - tchebycheff ” on the analyzing of basic measure method of boiler ’ s air flow . secondly , model86 averaging pitot tube was selected the right model of flow transducer which can pickoff the differential pressure and static pressure . modelc264 which made in setra system corp . u . s . a was selected as ultra low differential pressure transmitter . a good flow of boiler ’ s air was calculated by offsetting pressure and temperature . finally , numeroscope was designed with z80cpu and other chips 精确的监测有助于提高锅炉燃烧的安全型、经济性,也有助于提高电厂的整体自动化水平。本文设计的智能化锅炉风量测量装置能够实现对锅炉送风的精确测量,精度可达。本文首先研究锅炉送风矩形大管道测量理论,提出在流来流量测量测点布置基于“对数-切比雪夫”法的速度-面积法。