一、概述随着技术的发展和节能的需要,我国中小型电力变压器正处在更新换代的时期。1981年5月完成了SL_7系列中小型电力变压器的设计工作,1982年5月进行了样机的试制和鉴定。按照S_7系列的损耗标准,各厂又先后试制了S_7系列(铜线)中小型电力变压器,目前SL_7 First, an overview With the development of technology and energy-saving needs, China’s small and medium power transformers are in a period of upgrading. May 1981 completed the SL_7 series of small and medium-sized power transformer design work, in May 1982 for a prototype trial and identification. In accordance with the S_7 series of loss standards, the factory has also trial-produced S_7 series (copper) small and medium-sized power transformers, the current SL_7