Product Design Features:
The company places great emphasis on product development and design, continuously applying new technologies and materials to enhance product design standards. The company utilizes reliable transformer optimization calculation software and employs computers to conduct precise analysis and calculations of electric fields, magnetic fields, temperature fields, and static and dynamic potential gradients under various impulse voltages. This ensures reasonable distribution of field strength and impulse gradients, enabling the quick achievement of optimal technical and economical design solutions.
Product Technical Features:
Reduced Partial Discharge
All transformer insulation components are chamfered and deburred. Insulation pressboards from Weidmann (Taizhou) are used to ensure no impurities or defects. Shielding is applied during lead wrapping to ensure smooth electrodes. Lead connections are made using cold-press welding. All sharp edges of the tank are chamfered and rounded. The core assembly is kept clean, with no foreign objects allowed. The core undergoes vapor-phase drying and vacuum oil immersion.
Prevention of Oil Leakage
All tank flanges are precision-machined with limit grooves to ensure proper compression of sealing gaskets. Sealing gaskets are made of imported Shenma rubber to enhance aging resistance. All components are pre-assembled in the factory and undergo pressure tests to prevent oil leakage during transformer operation.
Reduced Transformer Noise
Air-cooling and self-cooling methods are prioritized. The product features automatic switching between self-cooling and air-cooling, with noise levels below 68 dB. Vibration-damping pads are installed under the tank, and soundproof panels can be added to the tank walls. Magnetic flux density is kept below 1.7 Tesla.
Short-Circuit Withstand Capability
Imported winding machines with compression and tightening devices, as well as imported winding frames with tensioning devices, are used to ensure radial tightness of windings and avoid radial loosening due to axial compression. No assembly allowance is required. Transposed conductors and combined conductors are employed. For high-voltage products, inner shielding replaces traditional interleaved structures to reduce failure points and improve efficiency.
Additionally, insulation components are pre-dried. Windings, phase assemblies, and core assemblies are subjected to constant-pressure pre-compression and dried separately to ensure uniform winding height, balanced ampere-turns, and improved tensile, bending, and shear strength of conductors. Hard pressboard cylinders and doubled spacers are used to ensure winding stability.
Main Product Features:
330kV Power Transformers
The company has independently developed a 200MVA/330kV autotransformer. The voltage combination is 330/161±8×1.25%/34.5 kV, with a connection group of YNa0d11 and air-cooling. The autotransformer's medium-voltage winding is part of the high-voltage winding, forming a common winding. The high-voltage winding consists of a series winding and a common winding. Voltage regulation is applied at the common winding terminal. The structural capacity of the autotransformer is smaller than its rated capacity, making it suitable for various operational modes. It is commonly used as a tie-in transformer, reducing investment and operational costs. Autotransformers feature compact size, lightweight, and low losses.
230kV Power Transformers
The company has independently developed a 300MVA/230kV autotransformer with forced oil air cooling. Oil pumps are installed on radiators to accelerate oil circulation. Pressboard-made oil guide plates are added to the core assembly, featuring lightweight and low cost. These plates are fixed with wooden clamps, achieving the same performance as steel plate oil guides.
Additionally, the company has independently developed large power transformers with external auxiliary transformers and strong short-circuit withstand capabilities, such as 150MVA/225 kV and 100MVA/225 kV models. These transformers feature large-capacity three-phase three-limb core structures.
110kV Power Transformers
The company has independently developed a 44.8MVA main-series transformer. The high-voltage side supports 115±2×2.5% kV non-load tap changing, while the low-voltage side supports 13.8±16×0.625% kV on-load tap changing. This transformer uses a main-series transformer voltage regulation method, with an additional series transformer inside the main tank. The main transformer and series transformer are independent, with separate cores and windings, enabling integrated lifting and installation. The main-series transformer can serve as a backup replacement for two main transformers with completely different high- and low-voltage bushing configurations.
The company has also independently developed a 67MVA/132 kV power transformer with a three-phase oil-gas bushing common tank structure and water cooling.
66kV Power Transformers
The company has independently developed a 40MVA/66 kV power transformer with a three-phase common oil-gas bushing tank and centralized cooling.
Product Track Record:
Over the past two decades, the company's power transformers have been exported to Europe, Oceania, South America, Asia, and Africa. Countries served include Ukraine, Saudi Arabia, Ethiopia, New Zealand, Ecuador, the Philippines, Bangladesh, Kyrgyzstan, Zambia, Morocco, Jordan, and Malawi. Clients include State Grid Corporation of China, ANDRITZ Group, ZESCO (Zambia Electricity Supply Corporation), Jordan National Electric Power Company (NEPCO), Ukraine Electricity Company, Kyrgyzstan National Grid Company, ABB India, ABB s.r.o. (Nigeria), and POLINA (Ukraine). Approximately 1,000 power transformers have been exported over the past twenty years.
