外文翻譯---發(fā)電機和變壓器-文庫吧
2025-01-02 23:07 本頁面
【正文】 y winding or output winding. If there is a third winding on the transformer, it is called the tertiary winding.Power transformer is constructed on one of two types of cores. One type of construction consists of a simple rectangular laminated 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 minimn.The primary and secondary windings in a physical transformer are wrapped one on top of the other with lowvoltage winding innermost. Such an arrangement serves two purpose: (1)It simplifies the problem of insulating the highvoltage winding from the core. (2)It 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 there use in power systems. A transformer connected to the output of a generator and used to step its voltage to transmission levels is sometimes called a unit transformer. The transformer at the other end of the transmission line, which steps the voltage down from transmission levels, is called a substation transformer. Finally, the transformer that takes his distribution levels, is called a distribution transformer. All these devices are essentially the samethe only difference among them is their intended use.In addition to the various power transformer, twospecial purpose transformers are used with electric machinery and power systems. The first of these special transformers is a device specially designed to sample a high voltage and produce a low secondary voltage directly proportional to it. Such a transformer is called a potential transformer. A power transformer also produces a secondary voltage directly proportional to its primary voltage。 the different between a potential transformer and a power transformer is that the potential transformer is designed to handle only a very small current. The second
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