箱式变压器并不只是变压器，它相当于一个小型变电站，属于配电站，直接向用户提供电源。包括高压室，变压器室，低压室；高压室就是电源侧，一般是35千伏或者10千伏进线，包括高压母排（High voltage busbar）、断路器或者熔断器、电压互感器、避雷器等，变压室里都是变压器，是箱变的主要设备，低压室里面有低压母排(Low voltage busbar)、低压断路器、计量装置、避雷器等，从低压母排上引出线路对用户供电。
Box transformer is not just a transformer, it is equivalent to a small substation, belongs to the distribution station, directly provide power to users. Including high-voltage chamber, transformer chamber, low-voltage chamber; high-voltage chamber is the power side, usually 35 kilovolt or 10 kilovolt incoming line, including high-voltage bus bar, circuit breaker or fuse, voltage transformer, arrester, etc., transformer chamber is the main equipment of box transformer, low-voltage bus bar, low-voltage circuit breaker and meter are in low-voltage chamber. Measuring device, lightning arrester and so on, from the low-voltage bus line out of the power supply to users.
The protection of box transformer is specially designed to protect transformer. It is a high-tech product of power automation, which integrates protection, monitoring, control, communication and other chengde.75ix.cnwww.xiangsuhejin.cnwww.handanbaojie.net.cnwww.chengdebanjia.cnfunctions. It is ceshiyig.89ix.comfeidianlan.07858.netan ideal electrical unit of intelligent box transformer. The product has built-in a protection library composed of more than 20 standard protection programs, which has a complete and powerful acquisition function for voltage and current analog and switching quantities of primary equipment (current measurement is realized by protective CT).