1250 kva 1600KVA 15KV to 400V encapsulated transformer three phase oil immersed power transformer
1250 kva 1600KVA 15KV to 400V encapsulated transformer three phase oil immersed power transformer
1. Product Description
This 1250 kva and 1600KVA three phase oil immersed power transformer is a high-capacity encapsulated distribution transformer engineered for medium-voltage power conversion, featuring a standard 15KV high voltage input and stable 400V low voltage output. As a heavy-duty industrial-grade power transformation device, it fills the demand gap for large-load power distribution in modern industrial parks, municipal substations and commercial power grid systems, delivering reliable step-down performance for 15KV medium-voltage overhead and cable power networks. The dual capacity grades of 1250kva and 1600kva cover mainstream high-load application requirements, serving as one of the most widely specified encapsulated oil immersed transformers for industrial and utility power projects worldwide.
Built to comply with IEC 60076 and IEEE international power equipment standards, this encapsulated three phase transformer adopts premium low-loss silicon steel core and full copper three-phase winding structure. Different from conventional open-type oil immersed transformers, it integrates professional encapsulated sealing technology to lock internal windings and insulating oil completely, effectively preventing moisture intrusion, dust accumulation and oil aging during long-term operation. Equipped with mature ONAN oil natural air natural cooling system, the equipment maintains stable heat dissipation and insulation performance even under continuous full-load and peak-load conditions. Every unit undergoes strict factory testing including high-voltage withstand verification, three-phase balance calibration, full-load aging testing and insulation resistance detection to ensure consistent operational stability.
Designed specifically for 15KV to 400V voltage conversion, this high-power oil immersed power transformer optimizes internal magnetic circuit and winding parameters to minimize voltage deviation and power loss during energy conversion. The robust welded steel tank structure enhances mechanical strength and environmental adaptability, while the standardized three-phase layout ensures balanced current distribution and low operational noise. Available in both conventional and enhanced encapsulated configurations, it supports long-term unattended operation, making it a cost-effective and high-reliability core power device for medium-voltage grid power distribution and industrial power transformation projects.
2. Core Purpose
The core purpose of this 1250kva/1600KVA three phase oil immersed power transformer is to implement safe, efficient and stable medium-to-low voltage power conversion for 15KV industrial and municipal power grids. It professionally steps down 15KV medium-voltage industrial and grid power into standard 400V three-phase low-voltage power, matching the operating voltage requirements of most industrial mechanical equipment, commercial electrical systems and municipal public power facilities, and bridging the voltage gap between medium-voltage transmission lines and terminal power consumption loads.
As a key encapsulated distribution transformer for high-load scenarios, it undertakes core tasks of regional power load balancing and power quality optimization. The optimized low-loss structure effectively reduces no-load loss and load operation loss during high-power energy conversion, lowering long-term power transmission loss and operational costs for power utilities and industrial enterprises. The precise three-phase balance design suppresses grid fluctuation, voltage surge and harmonic interference caused by frequent load switching, stabilizing terminal 400V output power quality and improving the overall operational efficiency of medium-voltage power distribution systems.
In addition, the integral encapsulated sealing structure provides reliable electrical isolation and fault protection. It achieves complete physical isolation between 15KV high-voltage input terminals and 400V low-voltage output terminals, effectively resisting lightning surge, overvoltage impact and short-circuit faults. It supports 24-hour continuous full-load operation and seasonal peak load switching, ensuring uninterrupted and safe power supply for large industrial production, urban grid distribution and high-reliability public infrastructure projects.
3. Application Scenarios
3.1 Large Industrial Park Power Distribution
This 1250 kva and 1600KVA encapsulated three phase oil immersed transformer is the preferred power distribution equipment for large manufacturing industrial parks, chemical processing bases, metallurgical factories and mechanical production workshops. These industrial scenarios feature high load density and long-term continuous power consumption, and the 15KV to 400V professional voltage conversion perfectly matches industrial medium-voltage grid standards and terminal equipment operating requirements. The high-capacity design fully supports stable operation of large motors, automated production lines and industrial auxiliary electrical systems, while the encapsulated oil immersed structure adapts to dusty, high-temperature and humid industrial workshop environments.
3.2 Municipal Substation & Urban Grid Upgrading
It is widely applied in urban regional medium-voltage substations, municipal power grid capacity expansion and old grid renovation projects. Modern urban power grids face growing residential and commercial power load demands, and this high-power 15KV level power transformer effectively solves the problems of insufficient power supply capacity and unstable peak voltage of traditional old equipment. The stable 400V three-phase output provides standardized power support for urban residential communities, commercial complexes and municipal public facilities, improving the overall power supply capacity and reliability of urban power distribution networks.
3.3 Public Infrastructure & Commercial Complex Projects
Suitable for large shopping mall clusters, high-rise office buildings, hospital campuses, airport supporting facilities and urban sewage treatment plants. These public and commercial scenarios require high stability and safety of power supply, with large instantaneous peak load and complex load types. The 1250kva and 1600KVA large load margin can cope with frequent load changes, and the encapsulated fully sealed structure ensures low failure rate and long-term stable operation, meeting the high-standard power guarantee requirements of key public infrastructure.
3.4 New Energy & Industrial Supporting Projects
The transformer is also commonly used for grid-connected power distribution of large photovoltaic power stations, wind power bases and industrial energy storage supporting projects. New energy power generation has obvious intermittency and load fluctuation, and this three phase oil immersed power transformer has strong grid anti-interference and load impact resistance, which can stabilize 15KV medium-voltage grid fluctuation and ensure stable 400V low-voltage output. It is perfectly adapted to new energy grid connection and industrial energy-saving power distribution transformation scenarios.
4. Product Features
4.1 Professional 15KV to 400V Voltage Matching Design
This encapsulated three phase oil immersed power transformer adopts exclusive 15KV high-voltage to 400V low-voltage fixed ratio conversion design, which is highly targeted for mainstream industrial and municipal medium-voltage power grid standards. Compared with universal adjustable voltage transformers, it has more precise voltage regulation rate, smaller output deviation and more stable power conversion efficiency. It can continuously and stably output standard 400V three-phase industrial power under rated 15KV input conditions, completely meeting the voltage requirements of global industrial and commercial three-phase electrical equipment.
4.2 Dual High-Capacity Grades for High-Load Adaptability
Covering two mainstream high-power capacities of 1250 kva and 1600KVA, the product achieves precise matching for different high-load scenarios. The 1250kva model is suitable for conventional large industrial parks and municipal regional power distribution with stable load, while the 1600KVA high-capacity version is tailored for load-intensive areas and peak-fluctuating industrial scenarios with higher power demand. Both capacities adopt optimized three-phase balance winding technology, ensuring uniform current distribution, no local heat accumulation and strong overload resistance during long-term full-load operation.
4.3 Encapsulated Sealed & Oil Immersed Dual Protection
Different from ordinary semi-sealed oil immersed transformers, this equipment integrates advanced integral encapsulation process and fully sealed oil tank structure. The encapsulated coil design locks internal windings to avoid displacement and insulation aging, while the fully welded steel tank prevents insulating oil leakage, moisture invasion and dust pollution. The high-purity anti-aging insulating oil cooperates with natural oil circulation cooling system to achieve efficient and uniform heat dissipation, ensuring stable insulation performance and mechanical structure in harsh environments such as high temperature, high humidity and heavy dust.
4.4 Low-Loss Energy-Saving & High Operational Efficiency
Adopting high-permeability low-loss silicon steel core and high-conductivity pure copper winding, the transformer effectively reduces magnetic flux leakage, no-load loss and load operation loss. The optimized magnetic circuit structure avoids core saturation under long-term high-load operation, significantly improving power transmission efficiency. Compared with traditional S11 and old-type transformers, it has lower comprehensive energy consumption, more stable operating temperature rise and more prominent energy-saving effects, effectively reducing long-term grid operation and power consumption costs.
4.5 High Safety & Low Maintenance Long Service Life
Built with complete overvoltage, overload, short-circuit and lightning surge protection mechanisms, the equipment can quickly respond to grid faults to protect terminal equipment and line safety. The fully encapsulated sealed structure requires no frequent oil replacement and routine maintenance, greatly reducing later operation and maintenance workload. The overall structural stability is strong, with low failure rate and strong environmental anti-corrosion and aging resistance, supporting more than 20 years of long-term stable operation, and has extremely high comprehensive cost performance in large-scale power engineering projects.
5. Frequently Asked Questions (FAQ)
5.1 How to choose between 1250 kva and 1600KVA capacity for engineering projects?
The 1250kva encapsulated oil immersed transformer is ideal for conventional large industrial workshops, ordinary municipal substation distribution and commercial parks with relatively stable and moderate high loads, offering balanced cost and performance. The 1600KVA high-capacity model is recommended for industrial parks with dense high-power equipment, urban core grid upgrading projects, new energy grid connection scenarios and areas with obvious seasonal peak load surges. Reasonable capacity selection can avoid long-term overload operation or idle energy waste, ensuring optimal operating efficiency and service life of the three phase power transformer.
5.2 What are the advantages of encapsulated structure over ordinary oil immersed transformers?
Traditional ordinary oil immersed transformers are prone to winding displacement, dust accumulation, moisture infiltration and insulating oil aging after long-term outdoor and industrial operation, leading to increased failure rate and insulation attenuation. This 15KV to 400V three phase oil immersed power transformer adopts integral encapsulated sealing technology, which firmly fixes internal windings and completely isolates internal components from external harsh environment. It features better waterproof, dustproof, anti-corrosion and anti-aging performance, lower operational loss and almost zero daily maintenance, making it more suitable for long-term unattended high-load operation of industrial and municipal key power distribution systems.
5.3 What mainstream scenarios are suitable for 15KV to 400V power conversion transformers?
15KV medium-voltage to 400V low-voltage conversion is the most common voltage matching mode for modern industrial and municipal power grids. This high-capacity encapsulated transformer is mainly applicable to industrial park medium-voltage power distribution, urban substation power transformation, large commercial complex power supply and new energy grid-connected power distribution projects. It can perfectly match the power consumption standards of industrial three-phase equipment and municipal public facilities, and is the most universal high-power power transformation equipment for 15KV level medium-voltage distribution networks.
