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Conference Record of the 2002 Annual Pulp and Paper Industry Technical Conference (Cat. No.02CH37352)最新文献

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Surges transferred through transformers 通过变压器传递的浪涌
J. Das
The lightning and switching surges can be transferred from one voltage level to another through transformer couplings. A distribution system, which may not be directly exposed to the overvoltages of atmospheric origin, but is connected to a utility system through a transformer of high turns ratio will be exposed to overvoltages on the secondary side due to overvoltages on the primary windings. The resulting stresses on the distribution system may exceed the BIL levels. The paper provides simplified expressions for the surge transfer voltages through the transformers and the results of EMTP simulations for lightning and switching surges in a typical distribution. Primary and secondary surge arresters and surge capacitors are shown to limit these overvoltages to safe levels.
雷电和开关浪涌可以通过变压器耦合从一个电压电平转移到另一个电压电平。一个配电系统,可能不会直接暴露在大气来源的过电压,但通过高匝比变压器连接到公用事业系统,将暴露在二次侧过电压由于一次绕组的过电压。由此产生的对配电系统的压力可能超过BIL水平。本文给出了通过变压器的浪涌传递电压的简化表达式,并对典型分布的雷电和开关浪涌进行了EMTP仿真。显示初级和次级浪涌避雷器和浪涌电容器可将这些过电压限制在安全水平。
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引用次数: 21
E-mail etiquette (netiquette) 电子邮件礼仪(网络礼仪)
J.C. Thompson, B.A. Lloyd
E-mail has replaced the interoffice memo and is the primary means of business communication. But all too often, correspondents don't follow the same common sense rules with e-mail as with printed correspondence. In fact, business e-mail should be more carefully constructed than paper mail (snail mail) because e-mail can be easily forwarded, attached to another message or kept indefinitely in an electronic filing cabinet. This paper presents some simple guidelines for electronic mail etiquette.
电子邮件已经取代了办公室间的备忘录,成为商务沟通的主要手段。但通常情况下,写信人在处理电子邮件时并不像处理印刷信件那样遵循常识性规则。事实上,商务电子邮件应该比纸质邮件(普通邮件)构造更仔细,因为电子邮件可以很容易地转发、附加到另一条消息或无限期地保存在电子文件柜中。本文提出了一些简单的电子邮件礼仪指南。
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引用次数: 8
Web embedded field devices Web嵌入式现场设备
B. Lloyd, M. Sušnik
By the end of 2002, it is estimated that there will be more than 42 million devices connected to the Internet. Better and simpler software development tools along with cheaper electronics make it possible to embed web interfaces into small and inexpensive microprocessor based field devices. Embedding a web server in a field instrument or sensor, allows users to access these devices from anywhere in the world utilizing a standard Internet Browser. This eliminates the need for proprietary or dedicated control software. In addition, such interfaces allow manufacturers access to their products after they are shipped; simplifying maintenance, diagnostics, and in-place firmware upgrades. This paper describes some of the issues related to web embedded field devices and the development of such devices.
到2002年底,预计将有超过4200万台设备连接到互联网。更好、更简单的软件开发工具以及更便宜的电子产品使得将网络接口嵌入到小型、廉价的基于微处理器的现场设备中成为可能。在现场仪器或传感器中嵌入web服务器,允许用户使用标准的互联网浏览器从世界任何地方访问这些设备。这消除了对专有或专用控制软件的需求。此外,这些接口允许制造商在产品发货后访问他们的产品;简化维护、诊断和本地固件升级。本文介绍了与web嵌入式现场设备相关的一些问题以及此类设备的发展。
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引用次数: 0
期刊
Conference Record of the 2002 Annual Pulp and Paper Industry Technical Conference (Cat. No.02CH37352)
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