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S13 transformers have introduced a most ideal core configuration, performance silicon steel strips, and advanced manufacturing processes and are manufactured via optimized design and elaborate processing. Now the product line has been qualified by strict testing made by a national authoritative test center and has attained a domestically leading level in quality and in performance.

S13 transformers have introduced a most ideal core configuration, performance silicon steel strips, and advanced manufacturing processes and are manufactured via optimized design and elaborate processing. Now the product line has been qualified by strict testing made by a national authoritative test center and has attained a domestically leading level in quality and in performance.

Low-loss small-and-medium sized oil-immersed transformers up to 35kV class are currently promoted by our company. The products, featuring leading technical parameters and structural design in China, have their unique features and are designed from the perspective of users.

In the structural and technical aspects, the iron core is not perforated and built with 45-degree mitered joints, with the limbs tied with semi-dry unidirectional weftless fiberglass adhesive tapes, having the characteristics of low height and low loss. Especially, thanks to the automatic processing line of silicon steel sheet, the shearing burr is lower than 0.01 mm. The core limb is wrapped with epoxy fiberglass adhesive tapes and the core is assembled with tensile rods, side yoke clamping bolts and steel channel sections to apply clamping pressure, which ensures the overall rigid structure of the core, and at the same time the low loss and low noise of the product. The coil of each phase is subject to drying, compression, pressure test and height adjustment as per the process to ensure that the height of each coil meets the design requirements. The coils are dried with variable-pressure vacuum drying. In order to reduce partial discharge and improve product reliability, the oil-filling process under vacuum, the vacuum requirement for oil filling, the evacuation time, and the oil filling speed are strictly controlled to ensure that the oil temperature is not lower than 60℃, and to avoid introducing gas during the oil filling process. The oil-filled transformer is allowed to stand still according to the prescribed time, so that the internal residual gas escapes or is absorbed by the oil, and the insulation is fully saturated. At the same time, workers at the production line have gone through rigorous training and internships on relevant 110kV transformer processes. The welding of the conservator tank is particularly strictly controlled and inspected to prevent leakage, ensuring that no leakage occurs.Based on the S9 series, the no-load loss of the S11 series products has been reduced by an average of 20%; the energy-saving effect is significant, the new iron core material, mitred three-corner-joint structure and uniform magnetic circuit distribution greatly reduces the no-load exciting current and no-load loss, and the no-load current is reduced by 70-85% compared to S9; the average temperature rise is reduced by 10K, the service life of the product is more than doubled, and it can be operated for a long time even under the condition of 120% load; and the average operating noise is reduced by 2-4 dB. The high and low voltage windings, body assembly, oil tank structure, protection devices, etc. are similar to the S9 series transformers. Both do not adopt the core-lifting structure, but apply the vacuum drying, vacuum oil filtering and oil injection processes, and use the corrugated oil tanks, without conservator tank.

Temperature environment
① Maintain long-term stability at 220℃
② Can withstand short-term operation at 350℃
③ Keep stable performance in a wide range of temperature and humidity
④ No melting, flowing and combustion supporting at 250℃
⑤ No release of toxic or corrosive gases at 750℃