Dyn11 Yyn0 3150kVA 4000kva 5000kva 35kv 10.5kv Pure Copper Oil Immersed Transformer
Dyn11 Yyn0 3150kVA 4000kva 5000kva 35kv 10.5kv Pure Copper Oil Immersed Transformer
1. Product Description
The Dyn11 Yyn0 3150kVA 4000kva 5000kva 35kv 10.5kv Pure Copper Oil Immersed Transformer is a high-performance three-phase medium-voltage power distribution transformer developed for industrial power grids and municipal power supply systems. This series of oil immersed power transformers offers three standard capacity options including 3150kVA, 4000kVA and 5000kVA, supporting 35kV high voltage input and 10.5kV low voltage output, and provides two mainstream vector group configurations of Dyn11 and Yyn0 to meet different grid operation and load matching requirements. All units adopt full pure copper winding design, completely different from aluminum coil transformers, ensuring stable electrical performance and long-term operational reliability in medium and high voltage power conversion.
Manufactured with mature oil-immersed cooling technology and fully sealed tank structure, this 35kV to 10.5kV step-down transformer uses high-purity insulating oil as insulation and heat dissipation medium, achieving efficient natural circulation heat dissipation and stable insulation protection. The core is fabricated from high-grade grain-oriented silicon steel sheets, which effectively reduces no-load loss and operating noise. The optional Dyn11 and Yyn0 connection groups endow the equipment with differentiated performance: the Dyn11 configuration excels in harmonic suppression and unbalanced load resistance, while the Yyn0 structure features stable phase alignment and simple grid matching, covering most medium-voltage power distribution working conditions for industrial and civil projects. Strictly tested in line with IEC and national power industry standards, this high-capacity copper transformer delivers consistent performance under full-load and long-duration continuous operation.
2. Core Purpose
As a key medium-voltage power conversion device, the 35kv 10.5kv pure copper oil immersed transformer mainly undertakes safe and efficient step-down power conversion for 35kV high-voltage power grids, converting high-voltage electric energy into standard 10.5kV industrial usable voltage to support regional centralized power distribution. With multi-capacity specifications of 3150kVA, 4000kVA and 5000kVA, it can flexibly match different load scale demands, solving the voltage grade mismatch between high-voltage transmission lines and factory internal power distribution systems, municipal substation terminal equipment and industrial supporting power facilities.
The optional Dyn11 and Yyn0 vector group designs further expand its practical value in power grid operation. The Dyn11 oil immersed transformer effectively suppresses triplen harmonics and improves zero-sequence current detection capability, stabilizing power quality under unbalanced and nonlinear load conditions. TheYyn0 power transformer maintains consistent phase angles on high and low voltage sides, adapting to balanced three-phase load power supply scenarios and optimizing grid phase matching accuracy. As a high-efficiency energy-saving distribution transformer, it reduces line transmission loss, stabilizes terminal voltage, and guarantees the safety, continuity and efficiency of medium-voltage power supply systems.
3. Application Scenarios
3.1 Large Industrial Park Power Distribution
This 5000kVA 4000kVA 3150kVA medium voltage oil immersed transformer is widely deployed in large manufacturing parks, heavy industrial bases, mining enterprises and chemical industrial zones. These scenarios require large-capacity, stable medium-voltage power support for production lines, frequency conversion equipment and mechanical transmission systems. The 35kV to 10.5kV voltage conversion perfectly matches the internal power distribution standard of industrial enterprises. For production workshops with frequent unbalanced loads and harmonic interference, the Dyn11 configuration can effectively improve power supply quality; for standard production areas with balanced three-phase loads, the Yyn0 version ensures stable and low-loss operation.
3.2 Municipal Power Grid and Substation Construction
It serves as core distribution equipment for urban central substations, suburban power grid upgrading and rural high-capacity power grid reconstruction projects. Modern municipal power grids have high requirements for power supply stability and fault tolerance. The full pure copper winding structure avoids power attenuation caused by long-term grid operation, while multiple capacity specifications meet the power demand of different urban functional areas. The Dyn11 vector group model is more suitable for urban commercial districts and residential clusters with complex load types, while the Yyn0 model is widely used in conventional municipal power distribution sections with stable and balanced loads.
3.3 New Energy Power Generation Grid Connection
This high-capacity oil immersed copper transformer is applicable to centralized photovoltaic power stations, wind power plants and energy storage power station supporting power distribution systems. New energy power generation has characteristics of intermittent power output and unstable load changes. The excellent overload resistance and harmonic suppression performance of the Dyn11 configuration can adapt to fluctuating power generation conditions, complete stable voltage conversion and grid-connected power transmission between 35kV grid lines and 10.5kV power distribution equipment, improving the safety and stability of new energy grid-connected operation.
3.4 Infrastructure and Large Public Projects
It is also widely used in large transportation hubs, urban comprehensive buildings, water conservancy and hydropower supporting facilities and other key public infrastructure projects. These projects feature large total power consumption and high requirements for continuous power supply. The 3150kVA–5000kVA wide capacity coverage can meet the centralized power distribution demand of large-scale equipment operation, and the oil-immersed fully sealed structure adapts to outdoor and semi-outdoor harsh operating environments, ensuring long-term trouble-free operation of project power systems.
4. Product Features
4.1 Dual Vector Group Configuration, Strong Scene Adaptability
This series of 35kV oil immersed power transformers provides two optional vector groups: Dyn11 and Yyn0, covering almost all conventional medium-voltage distribution scenarios. The Dyn11 connection mode features excellent harmonic suppression capability, which can trap triplen harmonics inside the delta winding and prevent harmonic pollution from feeding back to the public power grid. It also has strong unbalanced load resistance and sensitive ground fault detection performance, suitable for complex load environments. The Yyn0 connection mode realizes zero phase difference between high and low voltage sides, with simpler grid matching and more stable operation under balanced three-phase loads, meeting the operation standards of traditional standardized power grids.
4.2 Full Pure Copper Winding, Low Loss and High Efficiency
Different from ordinary aluminum winding transformers, this pure copper oil immersed transformer adopts 100% electrolytic copper coil winding. Copper material has lower resistivity, better electrical conductivity and stronger thermal stability, which significantly reduces no-load loss, load loss and operating temperature rise during long-term full-load operation. The optimized coil winding process ensures uniform current distribution, effectively avoids local overheating and aging, greatly improves power transmission efficiency, and reduces long-term grid operation energy consumption. The copper winding structure also enhances mechanical strength, resisting deformation caused by short-circuit impact and extending overall service life.
4.3 Multi-Capacity Optional, Flexible Load Matching
The product covers three mainstream large capacities of 3150kVA, 4000kVA and 5000kVA, which can accurately match the power demand of small and medium-sized industrial parks, large factories and municipal substations. Users can select corresponding capacity specifications according to actual load scale and future power expansion plans, avoiding equipment capacity waste or insufficient power supply margin. All capacity models adopt unified standardized production standards, with consistent structural performance and installation dimensions, convenient for project design, equipment replacement and later capacity upgrading.
4.4 Sealed Oil Immersed Structure, Stable and Durable Operation
Adopting mature ONAN oil natural air natural cooling mode and fully sealed welding tank body, the internal high-quality insulating oil forms a natural circulation heat dissipation system, which efficiently takes away core and coil operating heat. The fully sealed design completely isolates external moisture, dust and corrosive gas, preventing insulating oil deterioration and internal insulation aging. The whole machine has low operating noise, strong weather resistance and anti-overload capability, and can operate stably for a long time in outdoor open-air, high temperature and humid industrial environments, with low daily maintenance frequency and high operational stability.
4.5 Strict Standard Production, High Safety and Reliability
All products are manufactured and tested in strict accordance with international IEC standards and power industry specifications, with complete overvoltage, overcurrent and short-circuit protection performance. The high and low voltage windings adopt multi-layer insulation structure with high insulation strength and strong lightning impact resistance. The optimized magnetic circuit design eliminates local magnetic leakage, reduces abnormal loss and vibration noise. The whole machine has high operational safety factor, low failure rate, and can adapt to long-term uninterrupted operation of key power supply projects, providing reliable power guarantee for industrial production and municipal power distribution systems.
5. Frequently Asked Questions (FAQ)
5.1 What is the core difference between Dyn11 and Yyn0 vector group transformers in practical use?
The most obvious difference lies in load adaptability and harmonic suppression performance. The Dyn11 transformer has a 30° phase difference between high and low voltage sides, can effectively suppress triplen harmonics in the circuit, bears unbalanced single-phase and three-phase mixed loads well, and supports sensitive ground fault detection, making it the preferred choice for modern industrial and urban power grids with complex loads. The Yyn0 transformer has zero phase difference between high and low voltage sides, with simpler grid connection and lower manufacturing cost, but it cannot effectively suppress harmonics and has poor tolerance for unbalanced loads. It is only suitable for working conditions with basically balanced three-phase loads and low harmonic content.
5.2 How to choose the right capacity among 3150kVA, 4000kVA and 5000kVA?
Capacity selection mainly depends on actual operating load and future expansion demand. The 3150kVA model is suitable for medium-sized factories, suburban community substations and conventional industrial supporting projects with stable and medium load power demand. The 4000kVA model is applicable for large processing factories and comprehensive industrial parks with slightly higher power consumption. The 5000kVA high-capacity transformer is the best choice for heavy industrial bases, new energy power generation supporting projects and urban core substations with large instantaneous load and long-term high-load operation. It is recommended to reserve 10%–20% capacity margin according to the actual load to avoid long-term overload operation.
5.3 Why is pure copper winding better than aluminum winding for 35kV medium voltage transformers?
Pure copper winding has far better electrical conductivity, thermal stability and mechanical performance than aluminum winding. Under the same 3150kVA–5000kVA large-capacity operation condition, copper coils have lower resistance, smaller operating loss and less heat generation, which can effectively reduce long-term power consumption costs. Copper material is not easy to oxidize and deform under high temperature and short-circuit impact, with lower failure rate and longer service life. Although the initial investment of pure copper oil immersed transformers is higher, their stable operation performance and low maintenance cost make them have higher comprehensive cost performance in medium and long-term industrial and municipal power projects.
