Baoding Tianwei Group (Jiangsu) Wu Zhou Transformer Co. Ltd.

Suzhou, Jiangsu, China

We are offering 220kv railway traction transformer. Traction transformers for electrified railway power supply a three-phase changing to two-phase special transformers, suitable for electrified railway traction system of direct supply transformer or power supply bt. Our company have the core technology of the railway traction transformer and capacity to produce various 220kv, 110kv railway traction transformers to meet the actual needs of the railway power supply. The traction transformers have the features of simple structure, impedance matching flexibility, good balance, and significant energy-saving, anti-short circuit ability to lead a high load capacity, and they have been linked to network and got high praise.

We are offering 10kv-35kv amorphous alloy transformer. amorphous alloy transformer uses new magnetic material , amorphous alloy, as core. The no-load losses dropped about 75% and no-load current declined about 80% compared with traiditional silicon steel core transformer. This reduces the running cost of the transformer greatly. Its an ideal distribution transformer and particularly suitable for low load rate areas such as countries, developing areas and having a great real meaning in building saving recourse society. our company develop sc(b)h15 series dry type amorphous alloy transformer and s(b)h15 series oil-immersed amorphous alloy transformer in time. We catch the centre problem that is declining products no-load-loss in designing, and considering suitable amorphous alloys parameters besides amorphous alloy core should be out of force. Great products are produced to suitable for different kinds of users and got high praise. main parameters:capacity: 30kva2500 kvavoltage class: 35 kv and belowtap range: 22.5%5%frequency: 50hznumber of phase: three phaseinsulation grade: a grade, f grade or h gradeother parameters depend on gb or users special requir- ements to design.

We are offering 110kv power transformer. it is based upon advanced technologies introduced from abroad and the successful experiences of leading manufacturers both domestic and abroad. It conforms entirely with up-to-date national standard gb1094.12-1996gb1094.3-2003gb1094.5-2003 and international standard iec76 commended by international electrical engin- eering committee, and are proud of the following outstanding features:1. Low loss, and significantly energy-saving. The average no-load loss is 35% lower than prescribed by national standard gb/t 6451-2008. 2. The core laminations are made up from high-quality cold-rolled grain-oriented silicon steel sheets with chamfered joints and without punched holes, and are stacked without the upper yoke sheets in place, so that they are effectively improved no-load upper together with lower frame. 3. Zigzag directed flow of oil are provided within the windings, so that all parts of the windings can be cooled more evenly. 4. The regulating winding is a separate winding which apart from the high voltage main winding. In this way, total ampere-turn balance between windings ; and the axial electrodynamic force during short circuit can be reduced, thus upgrading the short circuit withstand capability of the transformer as a whole. 5. The windings of one phase are assembled into an integral phase block before placing into the core. 6. The winding manufacture, winding assembly core and winding assembly work are all proceed in totally closed clean department. 7. Core frames in the form of a flat plate are used for clamping the core, and are joined together by side beams. The core and coil assembly is fixed in the tank, being positioned against the tank at six sides rigidly, so that there can be no displacement of the assembly due to impacts during transport. 8. Transformer tanks are fabricated with steel plates wide enough so that there are no weld joints on each surface. The steel plates for tank walls are pressed into corrugated shape to increase mechanical strength and to reduce noise due to vibration of the tank wall. 9. Diaphragm membrane is provided within the conservator, preventing direct contact of oil with air, protecting the oil from aging, thereby prolonging the service life of oil. Magnetic oil-level gauge reflects correctly the oil level in conservator. Flat plate-type radiator can effectively cool down the transformer. 10. Reliably sealed, and fine machined for sealed surface. Used double gasket grooves in their jointing surface and kept tight with high quality gasket material. If required by the customer, the upper and lower part of the tank can also be welded tight. 11. High quality paint is applied as surface finish of the tank and exposed steel parts, after shot-blasting and pretreatment, thus ensuring a durable life and glossy surface. 12. Quality assurance rules are also observed for all insulating parts, from raw material to final assembly. Strict regulations are observed for drying, wrapping and storage, preventing the absorption of moisture, swelling, and deformation. 13. Main componentsbecause of good relationship and long-term co-corporation with all well-known sub-suppliers, we can meet the requirements of customers with whatever types of components they wish to have.

We are offering 10kv-35kv power transformer. The transformers are in accordance with national standards gb1094 power trans- formers and gb/t6451 technical specifi- cations and requirements for three phase oil-immersed power transformers. The vol- tage regulation range is 1042.5% kv for 10 kv class and 532.5% kv for 35 kv class. Voltage regulation is effected by adj- usting the on-load tap changer on the high voltage side. Adjustment can be made manually or motor-operated, the output voltage on the secondary side at a required stable level. Therefore they are widely used in places where requirement of voltage quality is emphasized, such as institutes, building, hotels, hospital and factories. These transformers are new products and have better economy in operation.

We are offering 10kv-35kv dry type transformer. Sg (b) 10 series of non-encapsulated dry-type transformer is a new product with environmental protection, energy saving and security concepts. Nomex insulation material which is made by u.s. Du pont is used. Anaerobic, high-conductivity copper electromagnetic is used in high-voltage winding and low- voltage winding. Well-designed continuous, foil-type structure and vacuum pressure treatment process impregnation (vpi) make partial discharge to small. And without any cracking or reduction in the level of insulation phenomenon in the entire period. Overall vacuum impregnation, high temperature curing treatment, supported by using high-strength ceramics, and have a good capacity of sudden short-circuit current. The maximum allowable operating temperature of h-class heat-resistant coil insulation levels is 180, and the main insulating material is c-level (heat-resistant up to 220) of nomex paper. And there have more design margin. Products can be installed in the dirty environment and fire safety requirements, larger load area. They are widely used in high-rise buildings, airports, subway, terminal, petrochemical, densely populated areas, nuclear power plants and so on. features: 1. High reliability 2. Good security 3. Good environmental protection 4. Small size, light weight, attractive design. resin casted sc(b)9, sc(b)10 dry type transformers of glass fiber reinforced thin insulation, could be used as replacement of oil-immersed type distribution trans- formers. They are particularly suitable for power plant, highs-risebuilding, commercial center, theater, hospital, laboratory, museum, oil drilling platform, ship, port, station, airport, petrochemical plant, mass transit railway, tunnel, mine underground and other important place.

Our company provide 330kv oil-immersed power transformer , with capacity of 360mva and below. The transformer is based upon world-wide advanced technology and also incorporates the experiences of internationally leading transformer companies as well as our own long-term experiences. Low loss, low partial discharge and high short circuit withstand capability series transformers are achieved through innovation and optimization. Our transformer conform entirely with latest national standard gb1094.12-1996, gb1094.3-2003, gb1094.5-2003 and international standard iec-76. Outstanding features as follows:1. Low loss, low noisethe core laminations are composed of imported high quality grain-oriented cold-rolled silicon steel sheets with chamfered joints and the joints are step-lapped with 5 steps, thus ensuring low loss and low noise. The inside of the tank is lined with magnetic and copper shields, measures have been take for metallic structural pares located in high magnetic field, to deduce stray loss and thereby the total load loss, and to relieve local overhearing. Performance standard of 330kv class transformers which designed and manufactured by our company, can reach gb 10-type or gb11-type, and the noise is much lower than gb. 2. Safe and reliable servicereliability is the everlasting objective of our company, partial discharge of finished products are constantly kept below 100pc, ensuring that the transformers can be operated under long service voltage and occasional over-voltage without trouble. Low current density in winding conductor and appropriate cooling arrangement ensure that the winding temperature rise and top oil temperature rise are lower than that specified in the national standard by more than 5k and that the mechanical stress in winding conductor during short circuit does not exceed certain safe limit. Together with technological procedures during manufacture and other means to elevate mechanical strength, transformers can withstand server short circuit in all case during service. 3. Easy erection and maintenanceto minimize erection work at sit, transformers are so fabricated that lifting the active part out of the tank for inspection after arrival at sit is not mandatory. Beside, all components to be mounted on the transformer at site have been preassembled before dispatch, and all secondary wirings have been laid down into conduits on the transformer and connected to the terminals in the control cabinet or terminal box. Natural oil circulation and forced air cooling (onaf) are generally adapted in our 180kv class transformers below 240mva. 70% nameplate rating can still be achieved in case the fans are out of service. Little maintenance work is required for the cooling devices. 4. Careful fabricationvertical winding machines with tension device are used for winding, so that the windings can be wound more tightly and therefore mechanically strength as a whole. All insulation parts subjected to mechanical stress during short circuit, such as spacers in windings are made with t4 densified pressboard to deduce shrinkage. Drying process for the windings are carried out twice, once for ht individual winding, and again for the assembled phase block. after core and coil assembly, an additional vapor phase drying (vpd) is once more carried out to ensure that all insulation parts are thoroughly dried and no further shrinkage is possible to occur during service. All the high voltage terminals and nearby metallic structural parts are rounded up to prevent partial discharge. High voltage bushing terminals are contained with turrets, and kept concentric with the turret. All the leads are properly crimped and metallized to be rounded up. Vpd process insures that the moisture content within the transformer is kept at a very low level, and the core and coil assembly is once more cleaned by condensed vapor flowing down the surfaces. The fabricated tanks are relived from welding stress and shot-blasted integrally, so as to be free form oil leakage trouble and to give the tank a clean, pleasant looking appearance.

We are offering 500kv power transformer. Our company absorbed advanced technology from home and abord, combined with international and domestic famous manufacturers advanced technology and experienced manufacturing skills for many years, through the optimization of innovative, successfully produce low-noise, low loss, low partial discharge, high withstand short circuit ability series transformer. In according with latest national safety standard gb1094.1-2-1996, gb1094.3-2003, gb1094.5-2008 and the international electro-technical commission standard iec-76, the main structure features are as follows:shell-type tank, and a fully folded plate structure, elegant appearance. the core with chamfered joints, non-porous, non-stacked on the iron yoke technology, scientific and rational control of core clamping force, reduce the core losses and electromagnetic noise. full range location of core and tank, ensure shock resistance during transportation. advanced and reliable electrical calculation procedures, quantitative analysis of coil positioning the magnetic field distribution, the distribution of oil flow and leakage magnetic field distribution, to ensure adequate electrical strength and low loss, and effective inhibition the partial overheating. the body of transformer adopt multi-coil total assembly, constant drying measures to ensure the coils less rebound and uniform contraction, effectively improving the transformer ability to withstand short circuit. the core and coil internal diameter side adopt strengthen hard paper tube to achieve no gap structure between core and the coil, enhance the strength to withstand short-circuit of coil.

We are offering 10kv-35kv combined type transformer. Combined type wind power transformers are the self- developed and self-designed products which to meet the growing wind power generation requirements by digesting and absorbing the advanced technologies combined with domestic demand. The products are the transformers which installed on-load switch and full range protected fuses of high voltage current-limit in the tanks, using transformer oil as an insulating and cooling medium. The entirely sealed structure has the excellence, such as: small size, light weight, convenient installation, etc. The transformers can withstand shake and bumps in long-distance transportation way, and routine core inspection are not needed when the transformers sent to installation place. Boxes are adopted the special process, and they have good anti-corrosion ability to effectively prevent wind erosion and coastal salt spray. The cabinets of high-voltage and low-voltage are set with anti-wind and anti-rain crust, and both are used the l-type arrangement. The door of high-voltage cabinet is adopted web electromagnetic lock protection. It could be set surge arresters and displays and other electrical components by the users requirements. Low-voltage cabinet could be installed the protection, measurement and display devices such as framed-breaker or fuse according to the different requirements of users. Zbw (yb) series modular substation is combined with high-voltage room, transformer room, low-voltage chamber. It has excellencies such as run a safe, reliable, complete and strong, lower total cost, short installation, operation and maintenance simple, handsome in appearance and so on. this product can be used for loop power supply distribution system, also can be used as the terminal radial grid electricity.