外文翻譯--變壓器的類型及結(jié)構(gòu)(已修改)
2025-06-01 07:43 本頁面
【正文】 1 Types and Construction of Transformer A Transformer is a device that changes ac electric energy at one voltage level into ac e1ectric energy at another vo1tage level through the action of a ma8ic field． It consists of two or more coil of wire wrapped around a mon ferromagic core． These coils are (usually) not directly connected． The only connection between the coils is the mon magic flux present within the core. One of the transformer windings is connected to a source of ac electric power，and the second (and perhaps third) transformer winding supplies electric power to loads． The transformer winding connected to the power source is called the primary winding or input winding， and the winding connected to the loads is called the secondary winding or output winding. If there is a third winding on the transformer， it is called the tertiary winding． Power transformer are constructed on one of two types of cores． One type of construction 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 transmi
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