S11, S13, S18, S20, S22 series three-phase oil-immersed power transformers are suitable for input on the primary side and output on the secondary side of the power grid systems with rated frequency of50Hz and 60Hz. This series of transformers complies with both international and Chinese National standards such as 1EC60076, GB/T6451, GB1094, GB20052-2020, etc.

Select high-quality cold-rolled grain-oriented HI-Bsilicon sheet steel and stack iron cores automatically by intelligent robots in order to reduce no-load loss significantly, no-load current, and noise; Surface coated with resin paint with functions of moisture-proof, rust proof, and reducing noise.

The coil, produced by fully automatic winding machine, is made of high-quality electro-magnetic conductor and high-density DPE diamond dotted paper as interlayer insulation to improve conductivity and short-circuit resistance effectively.

The coil is made of high-quality copper foil or aluminum foil, wound by an automatic foil winding machine, and welded internally with argon gas protection with advantages of high welding quality and low resistance. F-grade prepreg is used for interlayer insulation to improve electrical and structural strength.

Conservator with rubber bag serves storing or replenishing oil to tank when the volume of transformer oil expands or contracts with the temperature of the oil to ensure that the oil tank is always filled with oil while isolate oil from air and reduce the rate of oil degradation. The oil conservator is equipped with an oil level gauge on the side to monitor changes in oil level.