20kv 400v Three-Phase Oil Immersed Transformers 35kv Input 440v Output 50Hz/60Hz Frequency
20kv 400v Three-Phase Oil Immersed Transformers 35kv Input 440v Output 50Hz/60Hz Frequency
1. Product Description
The 35kv input multi-output three-phase oil immersed transformer is a practical industrial and grid-grade power distribution equipment designed to fit global 50Hz and 60Hz AC power systems. This heavy-duty oil-filled power transformer adopts a standard high-voltage input of 35kv, supporting multi-level stepped voltage output including 20kv medium transmission voltage, 400V conventional low voltage and 440V industrial dedicated voltage. Unlike single-specification distribution transformers on the market, this multi-functional three-phase oil immersed model integrates high-to-medium and medium-to-low voltage conversion functions, perfectly matching the voltage standards required for regional grid power transmission, general civil power distribution and heavy industrial equipment operation.
Manufactured in strict accordance with IEC 60076 international power equipment standards, this 35kv three-phase oil immersed power transformer adopts high-quality low-loss grain-oriented silicon steel core and high-purity oxygen-free copper winding. The optimized internal magnetic circuit and coil structure effectively curb magnetic flux leakage, reduce no-load loss and load loss, and ensure stable voltage ratio under long-term continuous operation. Equipped with a mature ONAN oil natural air natural cooling system and fully sealed corrugated oil tank, the unit uses high-purity insulating oil for internal insulation and circulating heat dissipation. With universal 50Hz/60Hz dual-frequency adaptability, it can operate stably in most regional power grids worldwide without parameter modification, making it a highly versatile solution for medium and high voltage power distribution projects.
2. Core Uses
This universal-frequency three-phase oil immersed transformer mainly undertakes graded voltage transformation and multi-scenario power distribution tasks for 35kv high-voltage main grids. Its core working purpose is to step down 35kv high-voltage grid power to stable 20kv medium voltage for long-distance regional power transmission and secondary grid distribution, solving the problem of excessive line loss in direct high-voltage power supply. Meanwhile, it further converts medium voltage into standard 400V civilian power and 440V industrial three-phase power, realizing integrated power supply for urban residents, commercial facilities and industrial production equipment.
In daily power system operation, the 35kv input 20kv/400V/440V oil immersed distribution transformer also plays a key role in power quality optimization and grid safety protection. It can effectively balance three-phase load distribution, suppress voltage drop and voltage surge caused by peak load fluctuation and long-distance power transmission, and maintain stable output of each voltage level. The low-energy structural design reduces long-term operating power consumption of the power grid, improves overall power transmission efficiency, and provides reliable overcurrent, overvoltage and short-circuit resistance protection for downstream power distribution equipment and terminal electrical devices.
3. Application Scenarios
3.1 Regional 35KV Grid Construction and Upgrading
This three-phase oil immersed transformer is widely used in urban hub substations, suburban grid expansion and rural 35kV power network renovation projects. Many regional power transmission systems adopt 35kV high-voltage main grid access standards, which require step-down to 20kV medium voltage for regional power shunting and long-distance transmission. The 400V and 440V dual low-voltage outputs can directly meet local municipal and industrial power needs. With 50Hz/60Hz dual-frequency compatibility, it adapts to different national and regional grid specifications, becoming the mainstream supporting equipment for large-scale grid infrastructure construction.
3.2 Industrial Park and Factory Power Distribution
It is the preferred power transformation device for medium and large industrial parks, manufacturing factories, chemical plants and mining enterprises. Industrial production scenarios have mixed power demand: conventional factory auxiliary equipment and lighting systems adapt to 400V voltage standards, while heavy-duty motors, automated production lines and imported industrial equipment require stable 440V three-phase power supply. The 20kV medium-voltage output can also be used for internal partition power distribution in large industrial zones. The oil immersed heat dissipation structure supports long-term full-load operation and frequent load fluctuations, fully adapting to harsh industrial power consumption conditions.
3.3 Overseas Engineering and Cross-Regional Power Projects
Benefiting from universal 50Hz and 60Hz dual-frequency design and multi-voltage flexible output, this oil immersed power transformer is highly suitable for overseas power engineering contracting and cross-border power supply projects. It can perfectly match 60Hz grid standards in North America, Southeast Asia and Oceania, as well as 50Hz conventional grid systems in Europe, Africa and Central Asia. The collaborative output of 20kv, 400V and 440V can meet diversified local power standards, effectively reducing equipment customization costs for overseas projects.
3.4 New Energy Station Grid Connection and Auxiliary Power Supply
In centralized photovoltaic power stations, wind power bases and energy storage power station projects, this multi-voltage oil immersed transformer serves as a key grid-connected conversion unit. It converts fluctuating electric energy generated by new energy equipment into stable 20kV medium voltage for grid-connected transmission to 35kV main grids. At the same time, 400V and 440V outputs provide continuous and stable power for new energy station monitoring systems, inverter auxiliary equipment and on-site maintenance facilities, optimizing grid-connected power quality and improving new energy power utilization efficiency.
4. Product Features
4.1 Multi-Voltage Graded Output with Strong Matching Flexibility
This three-phase oil immersed transformer adopts a unique multi-stage voltage conversion design with 35kv high-voltage input, covering 20kv medium-voltage transmission, 400V general power supply and 440V industrial dedicated power supply. It solves the voltage mismatch problem of single-output transformers in mixed industrial and civilian scenarios. The voltage conversion accuracy is high with extremely low output fluctuation, which can precisely meet the power demand of grid transmission, civil buildings and heavy industrial equipment, greatly improving the comprehensive utilization rate of power equipment.
4.2 50/60Hz Dual-Frequency Universal Grid Adaptability
Optimized for global mainstream power frequency standards, this industrial oil immersed transformer can operate stably in both 50Hz and 60Hz AC power systems without manual parameter adjustment or structural replacement. The internal core magnetic circuit and winding structure are precisely calibrated for dual-frequency working conditions, avoiding magnetic saturation, abnormal heat generation and efficiency attenuation during frequency switching. It has wide grid compatibility and can be directly put into use in most countries and regions, perfectly fitting cross-regional power engineering construction needs.
4.3 Low-Loss Energy-Saving Design and High Operational Stability
Adopting high-conductivity pure copper winding and low-loss silicon steel core, the equipment effectively reduces no-load loss, load loss and line loss during power conversion. Compared with traditional ordinary transformers of the same voltage level, the overall power transmission efficiency is significantly improved. It has strong anti-interference ability and short-circuit impact resistance, can cope with frequent load fluctuations and unstable grid voltage in industrial scenarios, and maintains long-term stable and efficient operation, effectively reducing daily power consumption and operating costs.
4.4 Fully Sealed Oil Immersed Structure with Low Maintenance
The whole machine adopts an integrated fully sealed corrugated oil tank and vacuum oil injection process, which completely isolates internal insulating oil from external air, moisture and dust. It prevents oil oxidation, emulsification and insulation aging, realizing long-term maintenance-free operation. The mature ONAN natural cooling system features uniform and efficient heat dissipation, which can quickly export heat generated by full-load operation. The overall sealing structure effectively avoids oil leakage failure and greatly extends the service life of the transformer.
4.5 Excellent Environmental Adaptability and Wide Applicability
The transformer shell undergoes professional anti-corrosion, rust-proof and weather-resistant coating treatment, adapting to indoor substation closed installation and outdoor open-air installation environments. It can operate stably in high temperature, low temperature, humid and dusty harsh working conditions. With strong overload tolerance and low-noise operation performance, it is not only suitable for municipal power grid projects with high stability requirements, but also adapts to complex and changeable industrial and field engineering working environments.
5. Frequently Asked Questions (FAQ)
5.1 What is the difference between 400V and 440V output of this 35kv oil immersed transformer?
The 400V output is a universal standard low voltage, mainly used for urban residential power supply, commercial building electrical equipment, factory lighting and conventional auxiliary power distribution scenarios, matching most civil and general electrical equipment standards. The 440V output is a dedicated industrial voltage, specially designed for imported industrial machinery, heavy-duty motors and automated production lines that require higher rated voltage. This dual low-voltage output design enables one transformer to take into account both civil daily power consumption and industrial heavy-load power supply, avoiding the need to configure multiple transformers and saving project investment and installation space.
5.2 Can this dual-frequency transformer automatically adapt to 50Hz and 60Hz grid environments?
Yes, this three-phase oil immersed transformer supports full automatic adaptation to 50Hz and 60Hz power grids without any manual adjustment or accessory replacement. All internal electrical parameters, core structure and heat dissipation systems are optimized and tested for dual-frequency operation. Whether used in domestic 50Hz conventional power grids or overseas 60Hz industrial grids, it can maintain stable voltage conversion accuracy, low loss performance and heat dissipation efficiency, with no performance attenuation or potential safety hazards. It is a universal model suitable for global power distribution projects.
5.3 What mainstream scenarios is the 20kv medium voltage output mainly used for?
The 20kv medium-voltage output is mainly applied to regional long-distance power transmission, urban and rural grid partition power distribution, and internal power shunting of large industrial parks. Compared with low-voltage power transmission, 20kv medium voltage can effectively reduce line transmission loss and expand power supply radius, solving the problem of insufficient power supply capacity in remote areas and large-scale industrial zones. It cooperates with 35kv high-voltage input and 400V/440V low-voltage output to form a complete graded power supply system, realizing integrated operation of high-voltage grid access, medium-voltage transmission and low-voltage terminal power supply.
