外文翻譯--變壓器的類型及結(jié)構(gòu)-文庫吧資料
2025-05-22 07:43本頁面
【正文】 uction consists of a simple rectagu1arlaminated piece of steel with the transformer windings wrapped around two sides of the rectangle. This type of construction is known as core form． The other type consists of a threelegged laminated core with the windings wrapped around the center leg． This type of construction is known as shell form. In either case， the core is constructed of thin laminations electrically isolated from each other in order to reduce eddy currents to a minimum． The primary and secondary windings in a physical transformer are wrapped one on top of the other with the lowvoltage winding innermost． Such an arrangement serves two purposes： simplifies the problem of insulating the highvoltage winding from the core． results in much less leakage flux than would be the two windings were separated by a distance on the core． Power transformers are given a variety of different names, depending on their use in power systems. A transformer connected to the output of a generator and used to step its vo1tage up to transmission levels is sometimes called a unit transformer． The transformer at the other end of the transmission line， which steps the voltage down 2 from transmission levels to distribution levels is called a substation transformer. Finally， the transformer that takes the distribution voltage and steps it down to the final vo1tage at which the power is actually used is called a distribution transformer． A11 these devices are essentially the same the only difference among them is their intended use． In addition to the various power transformers， two specialpurpose transformers are used with electric machinery and power systems． The first of these special transformers is a device specially designed to sample a high vo1tage and produce a low secondary vo1tage directly proportional to it. Such a transformer is called a potential transformer． A power transformer also produces a secondary vo1tage directly proportional to its primary voltage。 the difference between a potential transformer and a power transformer is that the potential transfo
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