Main Power Transformer General:
The Xiecheng-brand 220kV, 110kV and 66kV low loss Main Power
transformers are independently developed based on advanced domestic and foreign technologies. Featured with reliable low partial discharge level, low loss, low noise, high reliability and strong anti-abrupt short circuit capacity, these products are highly appraised among the vast users and experts with their outstanding performance. The fully sealed products without windlass cover sell well all over the nation.
Partial discharge level: the apparent discharge magnitude under the voltage of 1.5 times the nominal voltage is less than 80pC;
Noise: below 58dB for products of 63MVA and below (AN);
Loss: non-load loss ratio is about 30% lower than IEC standard;
Reliability: none of the in-service products has experienced damage accidents or oil leakage;
Anti-short circuit capacity: SFZ11-50000/132 passed the short circuit bearing capacity test of Holland KEMA and lab of China National Transformer Quality Supervision Testing Center at one time.
High-voltage windings adopt the continuous interleaved structure to improve the distribution characteristics under surge voltage and obtain relatively uniform electric field distribution. The strips and cushion blocks are chamfered to improve the reliability of insulation.
There is winding oil guide structure inside the transformer winding, so that each area within the winding can be fully cooled, thus reducing winding temperature rise and winding hot spot temperature rise and extending the insulation service life.
Separate regulating windings are set for high-voltage and medium-voltage regulation units, so that the ampere-turn of each winding is relatively balanced and the axial electro-dynamic force can be effectively reduced in case of transformer short circuit, hence improving anti-short circuit capacity of the transformers. The windings adopt “0” margin design radially; the part between the iron core and the low-voltage winding cylinder, the part between the low-, medium- and high-voltage windings as well as the part in front of the strips and coaming assembly are fully dried and tightly fitted to ensure that the entire winding has perfect compactness and concentricity.
The core material is high-quality cold-rolled high magnetic conductive grain-oriented silicon steel sheets and the advanced automatic cutting line imported from Georg is used for blanking. The burrs at the sheared edges are controlled at smaller than 0.02mm.
The silicon steel sheets adopt the process of non-laminated top yoke and the lap joint of silicon steel sheets is 45° full sloping step. Integrated pressurizing and epoxy adhesive are applied to make the three limbs and two yokes a strong and smooth entity of high vertical accuracy, hence their no-load performance effectively improved and noise reduced.
Brackets are inserted between core limbs and the inner winding to support the core limbs; the iron yokes are strained with glass tapes immersed in epoxy; reaction pressure tap bolts are used between the lower yoke and the lower tank for tightening. In addition, there are three fastening points between the upper yoke and the upper tank and therefore displacement of the transformer body will not occur in the transportation process due to bumps.
Fuel tank and accessories:
The tank wall adopts wide steel sheets not butt welded; instead, they are corrugated to reduce weld joints and improve mechanical strength. Meanwhile, corrugated tank walls have dissipation effects, thereby reducing noise. The secondary circuit wiring board and control cabinets are all made with stainless steel. Our transformers are beautifully and concisely shaped.
All sealed surfaces are fine finished and sealed with high-quality sealing materials.
The tank edges have dual sealing grooves. The outer sealing material is used to prevent air and ultraviolet ray from damaging the internal sealing material, thereby improving the service life of sealing elements to the maximum extent and ensuring the sealing reliability.
We have established good cooperative relationship with many large transformer component manufacturers and can make diverse components based on different user requirements.
Our production, R&D and sales services are strictly
performed according to international standard
certification and ISO quality
220kv 110kv and 66kv Low loss series Power Transformer
why choose us
1. We are factory
Xiecheng have more than 10 years experience in electric power industry, the production capacity up to 240MVA with the primary voltage of 220KV,qualified supplier for china state grid.Offers more then 5000pcs of transformer to the over seas, Cost-effective, highly efficient, durable and easy-to operate transformer is what we deliver.
2. Provided turnkey solution
We offers you a complete turnkey solution for building a power plant, steel plant, foundry or metal forming Industry. We can design the plant, manufacturer the equipment, install and commission it. also we can Provide the professional engineer team to your place to run the factory for you.
3. Strict Quality Control System
Before Being dispatched from our factory all of our equipment will undergo a series of strict test, including the appearance quality test, voltage electrical test, aging test also the package strength checking. On our production line each worker takes personal responsibility for their assigned task and this allows us to guarantee our products.
4. Professional after sales service
(1) Our teams provide onsite installation, commissioning and after sales service.
(2) You will get free lifelong technical advice from our highly qualified engineers at Xiecheng. This will give you a lot of confidence when buying from our company.
(3) We guarantee the ongoing supply and preferential prices for spare and wearing parts.
(4) Our highly qualified team of service technicians are well equipped to keep your transformer operating at high efficience at all times.