220kv 180mva High-impedance Power Transformer    Power Transformer Main Function And Features 1. Iron core is made of cold-rolled silicon-steel sheet with high conduction of magnetism and adopts pulling-plank structure, so that its magnetic route is short, losses and noise level is low; 2. Comples wire is adopted for winding so losses are low and have good ability withstand short-circuit; 3. Its active part adopts special pressing method which could ensure reliable axial pressure; 4. The oil tank is bell type with the structure of full folding plate type, having an excellent exterior and easy for maintenance; 5. Adopting capsule-type oil container, it can reduce oil aging to the lowest degree.   •General                  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.        1)Amount of  local discharged:  The apparent discharge amount is less than 80pC under the 1.5 times of rated voltage;        2)Noise: Products of 63MVA and below is lower than 58dB(AN);        3)Power loss: no-load loss is 30% lower than that of IEC standard;        4) Reliability: All in-service product have no damages or oil leakage occurred;        5)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 0.02mm.        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.   •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 .   220kv 180mva High-impedance Power Transformer                           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 Type	10 Type	11 Type	9 Type	10 Type	11 Type
31500	220 242	±8×1.25% ±8×1.5%	6.3,6.6, 10.5,11, 20,34.5, 35,37, 38.5,66, 69	YNd11	12~14	38	34	30	135	128	128	0.7
40000						45	41	36	157	149	149	0.63
50000						54	49	43	189	180	180	0.56
63000						63	57	50	220	209	209	0.56
90000						80	72	64	288	274	274	0.49
120000						99	89	79	346	329	329	0.49
150000						116	104	93	405	385	385	0.42
180000						135	122	108	468	445	445	0.42