11KV GradeS9, S11 series power distribution transformer       2. General   The three-phase power distribution transformer applies new type insulating structure and makes short-circuit resistance strong. The iron core is made of high-quality cold-rolled silicon-steel plate. High –voltage winding group is made up of high-quality oxygen-free copper lines and it adopts multilayered drum type structure. All fasteners have been processed with special treatment to prevent them from loosening.   As high-tech product that promoted by the country, the power distribution transformer has many advantages such as high efficiency, low loss.power distribution transformer social benefits are remarkable that it will save much of electricity consumption and operating cost.   1) Core : The iron core adopts imported high quality cold rolled silicon steel sheet and full inclined echelon joint form . Its winding wrapped by eposy resin casted . The non load loss and non-load current , the noise of the core are reduced . The appearance get improved by special treatment on the surface of the fasterners and clamp pieces . 2) high voltage winding High voltage winding applies vacuum casted by epoxy resin which decrease the partial discharge capactiy and improve the strength of the coils . The inner or outer of the winding filling with the fibergladd mesh so that raise the mechanical strength  and improves the capability of the short-circuit reistance and ensure the coil will never crack 3) Low votlage winding Low voltage winding copper foil structure . The coils applies axial fan which lift the heat dispersion . Between the winding layers  , i t applies DMD epoxy resin pre-dip cloth and makes it whole solidification form .   Delivery Time 10-30 Days Depending On Quantity Ordered Service Conditions 1. Service Site: Indoor/Outdoor 2. Ambient Temp.:-40~+40 degree (or according to customer’s requirement) 3. Altitude: <=1000m (if it exceeding to 1000m, pls declare in order) 4. Max. Wind Speed: 35m/s 5. Relative Humidity :< =90% 6. Earthquake Resistant Capability: horizontal direction 0.3g vertical direction 0.15g (or by customer’s requirements        Catalog   Process and Test   Client visits   Shipping   Our Certificate as below :   Our factory     The activities of company