220kv 110kv and 66kv Low-loss series Power Transfo

•General EACHER brand 220kv 110kv and 66kv low-loss series transformer is our independently developed new generation of transformers on the basis of absorption of domestic and foreign advanced technology, which feature low local discharge, low loss, low noise, high reliability, strange protection against abrupt short circuit. Its excellent performance has been recognized by wide users and highly appraised by experts. The full-sealed suspending-cover free products sell well nationwide. Amount of local discharged: The apparent discharge amount under the circumstances.5 times of rated voltage is less than 80pCs; Noise: Products of old3MVA and below is lower than 58dB(AN); Power loss: no-load loss is 30% lower than that of IEC standard; Reliability: All in-service product have no damages or oil leakage occurred; Short circuit withstanding: Model SFZ11-50000/132 smoothly passed the short-circuit withstanding test of the national transformer quality supervision and inspection center and also passed Holland “KEMA” quality Control system. •Coil The high-voltage(HV) coil adopts an interleaved-continuous structure to improve the voltage characteristics under impact voltage and make voltage evenly distributed. All stays and pads are chamfered to keep highly reliable insulation. In the transformer winding there is a zigzag oil guide structure so as to fully cool all areas inside the winding, lower the temperature rise of the winding and the hot points of the winding and prolong the service life of insulation. The HV and MV regulation system are independently provided with voltage-regulating winding to balance the ampere turn of each winding-up, effectively lower the axial electrodynamic force generated at short-circuit of transformer and improve abrupt short-circuit withstanding capacity. The winding adopts radial “0” margin designed, between the core and the paper sleeve of LV winding, and between the LV, HV, voltage-regulating windings, as well as before insertion of stays and shroud plate they are fully dried and tightly matched to ensure extremely good compactness and concentricity of the entire winding. •Core The core is made of high-permeable grain-orientated top quality cold-rolled silicon sheet and the material is cut with advanced Germany Geoge GmbH automatic shear line with the cut burrs controlled within hearing.02mme.. The silicon sheet fabrication adopts “no-upper yoke-lapped’ technology and all lapped joints of the silicon sheet are 45 full-miters. The laminated core sheets are integrally pressed and adhered with epoxy resin to make the three –leg two-yoke core a strong and flat integral one with good verticality precision, this effectively improves no-load performance and reduces noises. Bracing plates are used as support between coil leg and inner coil. The iron yoke is tied with epoxy resin-impregnated glass fiber band, and the lower section of oil tank is tightened with counter-pressure bolts. The upper iron and the upper section of oil bank are fixed at this locations. Hence the body inside the oil tank can withstand the vibration during transportation without any shifting. Main Technical Parameters for three-phase two winding on- load-tap-changing power transformer: Rated power (kVA) High Voltage (kV) H.V Tap range Low Voltage (kV) Connection Symbol Short-Circuit Impedance (%) No-load Loss (kW) On-Load Loss (kW) No-load Current (%)9 Type10 Type11 Type9 Type10 Type11 Type31500220 242±8×1.25% ±8×1.5%6.3,6.6, 10.5,11, 20,34.5, 35,37, 38.5,66, 69YNd1112 143834301351281280.7400004541361571491490.63500005449431891801800.56630006357502202092090.56900008072642882742740.491200009989793463293290.49150000116104934053853850.421800001351221084684454450.42 •Oil tank and accessories The tank wall adopts wide steel sheet, which will be folded into corrugated structure without splicing , in this way welds are decreased and mechanical strength is enhanced ; meanwhile , the corrugated wall has diverging effect, and thus plays a role in decrease of noise. The routing troughs and control cabinets of the secondary circuit are all made of stainless steel , so the entire transformer has a simple and good looking. All sealing surface use quality sealing material and are precision-machined. On the edge of the tank there are double sealing grooves, and the outer sealing material is used to shade the atmosphere and ultra-ray to protect the inner sealing being damaged, thus at utmost prolonging service life and enhancing reliability of the seal. •Subassembly As we have good cooperation tie with many subassembly manufacturers of famous transformer brands, we are able to provide different subassemblies as per users’ requirements . The whole procedure of manufacture , R&D and sales service are carried out strictly in accordance with international standards and ISO quality management system .