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S11-M系列充油全封闭电力变压器采用全封闭波纹油箱，能有效防止被空气和水腐蚀，绝缘油纸老化。通过波纹片的弹性变形来调节油液体积的变化，是一种节能、安全、可靠、紧凑、耐用、免维护的新产品。
S11-M series oil-filled totally-enclosed power transformer adopts totally-enclosed ripple oil box which can effectively prevent from being eroded by air and water, and aging of insulating oilpaper. Adjusted the change of volume of the oil by the elastic deformation of ripple slice, It is a kind of energy-saving, safe, reliable, compact, durable and maintenance-free new product.