精品文档---下载后可任意编辑目录一、变压器..............................................................................................................................1变压器型号说明...........................................................................................................1干式变压器有三种形式...............................................................................................1干式变压器优势...........................................................................................................1二、UPS....................................................................................................................................1UPS 品牌.......................................................................................................................1模块化 UPS 的代表性结构..........................................................................................2模块化 UPS 优缺点......................................................................................................2工频机 UPS 与高频 UPS...............................................................................................4相序对三相输入 UPS 的影响......................................................................................6三、STS 与 ATS.........................................................................................................................7STS (静态转换开关)....................................................................................................7ATS（自动转换开关）................................................................................................7四、重复接地作用..................................................................................................................7定义..............................................................................................................................7重复接地的作用.................................................................................
