共查询到20条相似文献,搜索用时 78 毫秒
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大容量实心磁极同步电动机由于受到电网容量和起动温升等限制,需要采用软起动,就软起动的选择和计算及计算机仿真进行论述并提供了思路. 相似文献
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以某铅冶炼厂制氧站改扩建项目为例,介绍高压干式移磁无级调压软起动装置和就地无功补偿装置的工作原理及其在罗茨鼓风机上的应用、高压干式移磁无级调压软起动装置和就地无功补偿装置的选型及参数计算、罗茨鼓风机配电系统设计、罗茨鼓风机现场运行效果。 相似文献
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电动机起动时会导致母线电压下降,在不同的电网下不同的起动方式致使母线电压下降的幅度不一样,根据电网容量与电动机容量的比值,选取合适的起动方式,才能不影响同一母线下的其他用电设备.在高炉鼓风机这一特定的应用场景下,从电网对软起动装置的限制条件出发,给出了在不同的电网容量下,如何较经济地选用软起动装置的方法,提高工程项目的... 相似文献
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《Power Delivery, IEEE Transactions on》1998,13(1):73-77
IEEE Standard 1344, Synchrophasors for Power Systems, was completed in 1995. It sets parameters required to ensure that phasor measurement will be made and communicated in a consistent manner. It specifies requirements for the timing signal used for phasor synchronization and the time code needed for input to a measurement unit. GPS is the recommended time source and IRIG-B is the basic format used for time communication. The standard requires correlating phasors computed from unsynchronized and synchronized sampling to a common basis. Timetagging accurately and consistently is essential for wide area comparison of phase. The standard specifies information exchange and control message formats. These include data output, configuration, and command messages. It includes 7 annexes that discuss the concepts covered in the body of the standard 相似文献
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Yuan Chen Westergard L. Mojarradi M.M. Johnson T.W. Cozy R.S. Billman C. Burke G.R. Kolawa E.A. 《Device and Materials Reliability, IEEE Transactions on》2006,6(2):146-153
A design for reliability methodology has been developed for electronics for low-temperature applications. A hot carrier aging (HCA) lifetime projection model is proposed to take into account the HCA impact on technology, analysis of parametric degradation versus critical circuit path degradation, transistor bias profile, transistor substrate current profile, and operating temperature profile. The most applicable transistor size can be determined in order to meet the reliability requirements of the electronics operating under low temperatures. This methodology and approach can also be applied to other transistor-level failure and/or degradation mechanisms for applications with varying temperature ranges. 相似文献
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分析了GIS断路器故障原因,介绍了检验过程与充气检查、监督情况,并提供一些可借鉴的成功经验。 相似文献