25000kVA 31500kva 35kv 10.5kv Pure Copper Oil Immersed Transformer
1. Product Overview
The 25000kVA and 31500kVA 35kV/10.5kV pure copper oil immersed transformer is a high-capacity, medium-voltage three-phase power conversion device designed strictly in accordance with IEC 60076 international standards and national power industry specifications. As a core piece of 35kV medium voltage oil immersed power transformer equipment, this product adopts full pure oxygen-free copper winding structure and high-performance oil-immersed cooling technology, realizing stable voltage conversion between 35kV high-voltage input and 10.5kV low-voltage output. It covers mainstream large-capacity specifications of 25000kVA and 31500kVA, perfectly matching the power demand of large-scale power grids and heavy industrial scenarios.
Different from aluminum winding transformers, this pure copper winding distribution transformer features lower resistance, lower power loss and stronger overload capacity. The whole machine adopts ONAN (Oil Natural Air Natural) natural cooling mode, with fully sealed oil tank structure and high-quality CRGO cold-rolled grain-oriented silicon steel core. It effectively suppresses no-load loss and operating noise, ensuring long-term stable operation under harsh outdoor and industrial environments. This 35kV/10.5kV step-down oil immersed transformer is a high-efficiency and durable power transmission and distribution solution for modern power systems, industrial parks and new energy power stations.
2. Core Product Features
2.1 Premium Pure Copper Winding Structure
This high-capacity oil immersed transformer adopts 100% high-purity oxygen-free copper coils as conductive components, which is the core advantage of pure copper oil immersed transformer compared with ordinary products. The pure copper winding has excellent electrical conductivity, effectively reducing copper loss during power transmission, improving the overall operating efficiency of the equipment, and avoiding the heating and power attenuation problems caused by aluminum winding oxidation. The winding is reinforced with multi-layer insulation and fixed with high-strength structural parts, with uniform electric field distribution, strong mechanical strength, and excellent short-circuit resistance, which can resist instantaneous impact current of power grid fluctuations and ensure long-term safe operation.
2.2 Low Loss & Energy Saving Performance
Equipped with high-grade CRGO cold-rolled grain-oriented silicon steel core, the 25000kVA/31500kVA 35kV/10.5kV transformer minimizes magnetic flux leakage and no-load loss. Optimized electromagnetic design and coil winding process greatly reduce operating energy consumption, achieving national first-class energy-saving standard. As an energy-saving 35kV power transformer, it can effectively reduce long-term operation power consumption for users, lower grid operation costs, and meet the energy-saving and emission reduction requirements of modern smart power grids.
2.3 Reliable Oil Immersed Cooling & Sealing System
Adopting mature oil immersed heat dissipation technology and fully sealed tank structure, the equipment uses high-insulation transformer oil as heat dissipation and insulation medium. The natural convection circulation of transformer oil quickly takes away the heat generated by coil and core operation, matching the ONAN natural air cooling mode to ensure stable temperature rise under full-load and long-term operation. The fully sealed design isolates external moisture, dust and corrosive gases, prevents transformer oil deterioration and insulation aging, greatly extending the service life of the equipment and reducing daily maintenance frequency. This outdoor sealed oil immersed transformer is highly adaptable to complex environmental conditions.
2.4 Stable Voltage Conversion & Strong Overload Capacity
With a professional 35kV to 10.5kV step-down design, the transformer realizes precise and stable voltage conversion, ensuring the output 10.5kV voltage is within the standard fluctuation range and providing high-quality power supply for terminal equipment. The 25000kVA and 31500kVA large-rated capacity design endows the equipment with strong overload operation capability, which can cope with peak power consumption impact and sudden load changes. It supports 24-hour continuous full-load operation and has excellent grid adaptability, suitable for high-load continuous operation scenarios.
2.5 High Safety & Low Noise Operation
The whole machine is equipped with complete protection configurations including gas relay, over-temperature protection and oil pressure protection, with multiple safety protection mechanisms to avoid equipment failure caused by overheating, short circuit and oil leakage. The optimized core lamination process and shock absorption structure effectively reduce operating noise, realizing low-noise and environmentally friendly operation. The product complies with IEC 60076 series international standards and national power safety specifications, with high insulation level and strong lightning impulse resistance, ensuring safe and reliable operation of medium-voltage power distribution systems.
3. Core Product Purpose
As a key medium-voltage power transmission and distribution device, the 25000kVA/31500kVA large capacity oil immersed transformer is mainly used for voltage conversion, power distribution and power stabilization in medium and high voltage power systems. Its core function is to convert 35kV high-voltage industrial grid electricity into 10.5kV standard industrial low-voltage electricity, providing compliant and stable power supply for various high-power electrical equipment and regional power grids.
In power system operation, this 35kV level power distribution transformer undertakes the tasks of grid power transmission, voltage regulation and load distribution. It can balance regional power supply pressure, improve power transmission efficiency, and reduce line loss. For industrial production scenarios, it solves the power matching problem of high-power production equipment, ensures the continuity and stability of industrial power consumption, and avoids production shutdown losses caused by voltage instability. In new energy power supply systems, it supports voltage matching and grid-connected power transmission for wind power, photovoltaic and other new energy power stations, realizing efficient integration of new energy power into the main grid.
4. Main Application Scenarios
4.1 Urban & Rural Power Grid Construction
This 35kV/10.5kV grid step-down transformer is widely applied in urban central substations, rural power grid upgrading and regional power distribution stations. The 25000kVA and 31500kVA large capacity can meet the power supply demand of urban commercial clusters, residential intensive areas and rural industrial concentration areas, effectively optimize urban and rural power grid structure, improve power supply capacity and grid operation stability, and support the safe operation of smart grid systems.
4.2 Large-Scale Industrial & Mining Enterprises
It is the preferred power supply equipment for heavy industrial scenarios such as metallurgy, chemical industry, mining, building materials and machinery manufacturing. These industries have high power load and high requirements for power supply stability. The high-capacity pure copper oil immersed transformer can stably support long-term full-load operation of high-power industrial equipment, resist industrial power grid fluctuations, ensure continuous and safe production of enterprises, and adapt to harsh industrial production environments such as high dust and high temperature.
4.3 New Energy Power Station Projects
Suitable for centralized photovoltaic power stations, onshore wind farms, energy storage power stations and other new energy scenarios. As anew energy grid-connected oil immersed transformer, it can convert the generated power of new energy equipment into standard 10.5kV grid-connected voltage, realize efficient grid-connected power transmission of new energy power, solve the problems of unstable voltage and intermittent power generation of new energy power supply, and improve the utilization rate of new energy power.
4.4 Industrial Park & Infrastructure Construction
It is widely used in national economic development zones, high-tech industrial parks, large-scale logistics parks and key infrastructure projects such as railway transit, airport engineering and water conservancy projects. The equipment provides stable and reliable centralized power supply for park supporting facilities and large-scale engineering equipment, meets the high-standard power demand of modern infrastructure construction, and guarantees the normal operation of public service facilities.
4.5 Commercial & Public Power Distribution Projects
Applicable to large shopping malls, hospital clusters, university campuses and other large public building groups. The large-capacity and low-loss characteristics of the transformer can meet the centralized power consumption demand of high-density commercial and public facilities, reduce power operation costs, and ensure the safety and stability of public power supply systems.
5. FAQ (Frequently Asked Questions)
5.1 What Are the Differences Between Pure Copper and Aluminum Winding Oil Immersed Transformers?
The core difference lies in conductive performance, service life and operating stability. Thepure copper oil immersed transformer adopts high-purity oxygen-free copper winding with lower resistivity, lower power loss and higher power transmission efficiency compared with aluminum winding products. Copper winding has stronger oxidation resistance and mechanical stability, is not easy to deform and age under long-term high-load operation, and has a service life 20%-30% longer than aluminum winding transformers. In addition, pure copper winding products have stronger short-circuit resistance and overload capacity, which are more suitable for large-capacity, high-load and long-term continuous operation scenarios such as 25000kVA and 31500kVA high-power equipment.
5.2 What Working Environment Is Suitable for 35kV/10.5kV 25000kVA/31500kVA Oil Immersed Transformer?
This series of 35kV medium voltage oil immersed transformers is designed for indoor and outdoor dual-use scenarios, adapting to conventional ambient temperature from -20℃ to +40℃ and humidity below 95%. The fully sealed oil tank structure can resist dust, rain and mild corrosive gas erosion, suitable for outdoor substations, industrial factory areas, new energy power stations and other open environments. At the same time, it can also be installed in indoor power distribution rooms of industrial parks and public buildings. It is not suitable for extreme environments such as severe corrosion, strong vibration and flammable explosive gas accumulation; special customized anti-corrosion and explosion-proof models can be provided for special working conditions.
5.3 How to Maintain the 25000kVA/31500kVA Large-Capacity Oil Immersed Transformer Daily?
This low-maintenance energy-saving oil immersed transformer has a fully sealed structure with low daily maintenance frequency. Daily maintenance mainly includes three key points: first, regularly check the transformer oil level and oil quality to ensure the oil level is within the standard range and no oil deterioration or leakage occurs; second, regularly clean the radiator and shell dust to ensure smooth heat dissipation and avoid overheating caused by poor heat dissipation; third, regularly detect the operating temperature, voltage and current data to ensure the equipment operates within the rated parameters. It is recommended to conduct a comprehensive electrical performance test and insulation detection every 1-2 years to effectively extend the service life of the equipment and ensure long-term stable operation.
