11/0.4 Kv 315kVA 400kVA Oil Immersed Copper Winding Three Phase Power Transformer
1. Product Overview
This document introduces the 11/0.4kV 315kVA 400kVA oil immersed copper winding three phase power transformer, a high-efficiency and reliable distribution transformer widely used in power transmission and distribution systems. Adopting advanced S11 series low-loss manufacturing technology, this three-phase power transformer features full copper winding structure and oil-immersed cooling design, with two mainstream rated capacities of 315kVA and 400kVA, matching the standard 11kV high-voltage input and 0.4kV low-voltage output voltage grade. As a core device for medium and low voltage power conversion, it stably converts high-voltage industrial and grid electricity into civilian and industrial usable low-voltage power, meeting the power supply demands of various commercial, industrial and municipal scenarios. All products comply with international power industry standards, with stable performance, long service life and excellent energy-saving effects, and are the mainstream choice for modern power grid renovation and power distribution engineering.
The oil immersed three phase distribution transformer adopts fully sealed corrugated tank structure, which avoids the intrusion of external moisture and dust. The pure copper winding ensures excellent electrical conductivity and anti-aging performance, effectively reducing power loss during long-term operation. Different from aluminum winding transformers, thiscopper winding power transformer has stronger overload capacity and more stable operating state, which can adapt to long-term continuous operation in complex power environments. The 315kVA and 400kVA capacity models cover the power supply needs of small and medium-sized loads, and are highly adaptable in civil power distribution, factory power supply and new energy supporting power supply scenarios.
2. Core Product Features
2.1 Premium Copper Winding Configuration
This 11kV/0.4kV copper winding transformer adopts high-purity oxygen-free copper windings, which has lower resistivity and better electrical conductivity than traditional aluminum windings. The integral winding process improves the compactness and mechanical strength of the coil, effectively resisting short-circuit impact and electromagnetic vibration. The copper winding structure greatly reduces load loss and temperature rise during equipment operation, avoiding overheating damage caused by long-term load operation. Meanwhile, copper materials have strong corrosion resistance and anti-oxidation performance, which effectively delays the aging speed of windings and extends the overall service life of the transformer by more than 30% compared with ordinary aluminum winding products.
2.2 Low-Loss Oil Immersed Cooling System
Equipped with a mature oil immersed cooling system, the transformer uses high-quality insulating transformer oil as the heat dissipation and insulating medium. Through the natural circulation of transformer oil inside the fully sealed tank, the heat generated by the core and windings is quickly dissipated to the outside, realizing efficient temperature control. This oil-immersed heat dissipation mode has better heat dissipation effect than air-cooled transformers, ensuring stable operation of the equipment under full load and overload conditions. In addition, the fully sealed oil tank design prevents insulating oil from oxidation and deterioration, avoids oil leakage failures, and realizes maintenance-free operation for a long time, greatly reducing later operation and maintenance costs.
2.3 Stable Three-Phase Voltage Conversion Performance
As a professional three phase power transformer with 11/0.4kV voltage ratio, the product realizes precise step-down conversion from 11kV medium voltage to 0.4kV low voltage, with balanced three-phase voltage and current, low voltage fluctuation and high power supply quality. It adopts high-grade oriented silicon steel sheet core with oblique five-joint stacking process, which effectively reduces no-load loss, no-load current and magnetic leakage. The no-load loss is far lower than the national standard, with excellent energy-saving and consumption-reducing effects. The product supports ±5% voltage tapping adjustment, which can flexibly adapt to grid voltage fluctuation and ensure stable output of low-voltage power.
2.4 High Safety and Environmental Protection Performance
The 315kVA and 400kVA oil immersed distribution transformers are designed with multiple safety protection structures, including overvoltage protection, short-circuit protection and lightning surge resistance, which can effectively resist external voltage impact and sudden load changes. The whole machine has low operating noise, no electromagnetic pollution, and the fully sealed structure will not cause environmental pollution. The compact and lightweight structural design saves installation space, and the firm welding process improves the seismic and anti-drop performance of the equipment, adapting to various outdoor and indoor harsh installation environments.
3. Core Product Purposes
The core purpose of the 315kVA 400kVA oil immersed power transformer is to complete medium and low voltage power conversion and stable power distribution, which is an indispensable core equipment in power transmission and distribution systems. Its main function is to step down the 11kV high-voltage power transmitted by the municipal power grid to 0.4kV low-voltage power that meets the usage standards of industrial equipment, civil electrical appliances and public facilities, realizing safe and efficient power transmission and distribution.
In addition to basic voltage conversion, this low loss distribution transformer also undertakes the functions of load balancing, power quality optimization and grid operation protection. It can stabilize grid voltage fluctuations, reduce power transmission loss, improve power supply efficiency, and ensure the continuous and stable operation of electrical equipment. For different load demands, 315kVA is suitable for small-load power supply scenarios, while 400kVA meets the power demand of medium-load equipment, realizing flexible matching of different power consumption scales. At the same time, the equipment can isolate grid faults to a certain extent, prevent fault diffusion, and improve the safety and stability of the entire power supply system.
4. Wide Application Scenarios
4.1 Urban and Rural Power Grid Renovation
This 11/0.4kV three phase distribution transformer is the preferred equipment for urban and rural grid upgrading and reconstruction projects. It is widely installed in community power distribution stations, street power distribution boxes and rural centralized power supply points, solving the problems of insufficient power supply capacity and unstable voltage in old grids. The low-loss and energy-saving features effectively reduce the long-term power consumption loss of the grid, helping to build energy-saving and efficient smart power grids.
4.2 Industrial Factory Power Supply
315kVA and 400kVA copper winding oil immersed transformers are widely used in small and medium-sized processing factories, mechanical workshops, food processing plants and light industrial production bases. They provide stable 0.4kV power for production equipment, assembly lines, lighting systems and auxiliary electrical facilities, adapting to long-term continuous industrial production power consumption. The strong overload resistance and stable operation performance can cope with peak power consumption fluctuations in industrial production and avoid production shutdowns caused by power supply instability.
4.3 Commercial and Civil Building Power Distribution
The product is suitable for shopping malls, office buildings, residential communities, schools, hospitals and other commercial and civil buildings. It provides centralized power distribution service for building lighting, air conditioning, elevator equipment and daily civilian electrical appliances. The low-noise and environmentally friendly design will not affect the living and office environment, and the high-safety performance ensures the safe power consumption of public buildings and resident families.
4.4 New Energy and Municipal Engineering
In new energy projects such as distributed photovoltaic power generation and small wind power generation stations, this high-efficiency oil immersed transformer is used for supporting power conversion and grid-connected power distribution, realizing the integration of new energy power into the municipal power grid. At the same time, it is also widely used in municipal engineering such as road lighting, park power supply, subway auxiliary power supply and water supply and drainage equipment power supply, providing reliable power guarantee for urban public facilities operation.
4.5 Temporary Construction Power Supply
Due to its convenient installation, stable performance and strong environmental adaptability, the 315kVA/400kVA three-phase oil immersed transformer is also commonly used for temporary power supply of construction sites, highway engineering, railway construction and field operation projects, meeting the short-term and high-intensity power consumption demands of construction equipment and field facilities.
5. Frequently Asked Questions (FAQ)
Q1: What is the difference between 315kVA and 400kVA oil immersed copper winding transformers in practical application?
The core difference lies in the rated load capacity and applicable power consumption scenarios. The 315kVA transformer is suitable for small-load power supply scenarios such as small residential communities, small shops and mini processing factories, with moderate power supply capacity and more cost-effective. The 400kVA model has a larger rated load, which can meet the power demand of medium-sized factories, large commercial buildings and multi-equipment intensive power consumption scenarios, and has stronger overload tolerance. Except for the capacity difference, the two models adopt the same 11/0.4kV voltage grade, copper winding process and oil immersed cooling structure, with consistent safety performance, energy-saving effect and service life, and users can choose according to actual load power consumption.
Q2: How to maintain the 11/0.4kV oil immersed three phase power transformer daily?
This fully sealed copper winding oil immersed transformer realizes long-term maintenance-free operation under normal working conditions, and only needs simple daily inspection. First, regularly check whether the transformer oil tank has oil leakage, whether the shell is deformed or corroded. Second, observe the operating temperature and noise of the equipment to ensure no abnormal overheating and loud noise during operation. Third, regularly check the tightness of wiring terminals to avoid poor contact caused by loose wiring. Fourth, keep the installation environment dry and ventilated, avoid long-term exposure to severe rain and dust accumulation. It is recommended to conduct a comprehensive performance test of insulating oil and windings every 2-3 years to ensure long-term stable operation of the equipment.
Q3: Why choose copper winding instead of aluminum winding for oil immersed power transformers?
Copper winding transformers have comprehensive performance advantages over aluminum winding products. First, copper has lower resistivity, which can effectively reduce load loss and no-load loss, with more prominent energy-saving effect and lower long-term operating cost. Second, copper winding has better ductility and mechanical strength, stronger resistance to short-circuit impact and electromagnetic vibration, not easy to deform and damage, and higher operation stability. Third, copper materials have excellent anti-oxidation and anti-corrosion performance, slow aging speed, and the service life is 20%-30% longer than that of aluminum winding transformers. In addition, the voltage output of copper winding three phase transformer is more stable, which can effectively avoid voltage deviation affecting the operation of electrical equipment, and is more suitable for long-term continuous and high-reliability power supply scenarios.
