重慶理工大学毕业设计模板.docVIP

重慶理工大學 CHONGQING UNIVERSITY OF TECHNOLOGY 题 目： 汽车减震器设计 专 业： 机电一体化工程 姓 名： 考 号： 准考证号 指导教师： 二〇 年 月 日 摘 要 变压器经济运行是指在传输电量相同的条件下，通过择优选取最佳运行方式和调整负载，使变压器电能损失最低。换言之，经济运行就是充分发挥变压器效能，合理地选择运行方式，从而降低用电单耗。所以，变压器经济运行无需投资，只要加强供、用电科学管理，即可达到节电和提高功率因数的目的。变压器经济运行不仅取决于经济运行方式，同时更取决于变压器的制造水平。按变压器经常负载大致可以分为四种情况：一是经常处于满载或接近满载运行的变压器；二是经常处于多半载运行的变压器；三是经常处于少半载运行的变压器；四是经常处于轻载或空载运行的变压器。由于励磁电流在变压器铁芯产生的交变磁通要引起涡流损失和磁滞损失。涡流损失是铁芯中的感应电流引起的热损失，其大小与铁芯的电阻成反比。磁滞损失是由于铁芯中的磁畴在交变磁场的作用下做周期性的旋转引起的铁芯发热，其损失大小由磁滞回线决定。 Abstract Reference to international standards (TOC), the economic evaluation of proposed methods of transformers, and gives examples of the calculation. The results showed that the use of S9-based type is more economic than S7; with S9 in service-type to replace the 64 and 73 series of high-loss transformers, investment return period of 2～3 years。 Transformer economic operation is the transmission of electricity under the same conditions, the best to run through the best way to select and adjust the load so that minimum loss of power transformers. In other words, the economy is to give full play to the transformer performance, a reasonable choice of operation mode, thus reducing electricity consumption. Transformer economic operation depends not only on the way the economy, but also depends on the level of transformer manufacturing.In accordance with the regular load transformers can generally be divided into four cases: First, are often full or near full load operation of the transformer; second is most often set to run in the transformer; third less often run half load transformer; Fourth, often light or set of transformer no-load operation. As the excitation current generated in the transformer core to be caused by alternating magnetic hysteresis loss and eddy current losses。 Eddy current losses are induced currents in t