Oil Immersed Transformer 11kv 33kv with 50kva to 2000kva Capacity Three Phase 400v 240v
1. Product Overview
This three phase oil immersed step down transformer is a professional medium-voltage power distribution device built to meet global industrial and civil power grid standards, covering a comprehensive capacity range from 50kva to 2000kva. Designed with dual high voltage input options of 11kv and 33kv, the equipment efficiently steps down high-tension electricity to standard low output voltages of 400v and 240v, perfectly matching most three-phase and single-phase terminal power consumption demands. Manufactured in compliance with IEC and IEEE industry standards, this 11kv/33kv oil immersed distribution transformer adopts mature oil natural air natural (ONAN) cooling technology and fully sealed insulation structure, ensuring stable and continuous operation in complex power grid environments.
Unlike small dry-type transformers limited to indoor use, this heavy-duty oil filled power transformer features strong overload resistance and excellent heat dissipation performance. It supports long-term full-load operation across all capacity specifications from compact 50kva models for small facilities to high-power 2000kva units for industrial parks. The dual output voltage design of 400v for three-phase industrial equipment and 240v for civilian single-phase appliances makes it a versatile dual-purpose step down transformer widely adopted in urban, rural and industrial power distribution networks worldwide.
Each unit undergoes strict factory testing for voltage conversion accuracy, insulation performance and load stability. The standardized three-phase winding layout effectively balances three-phase current, reduces power imbalance loss, and solves common problems such as voltage fluctuation and unstable power supply in medium-voltage grid step-down processes. As a core mainstream model in medium and large capacity oil immersed transformer series, it balances cost performance, operational stability and service life, suitable for long-term unattended outdoor and indoor power distribution work.
2. Core Purpose
The primary core function of this 11kv 33kv three phase step down transformer is medium-to-low voltage power conversion and grid power distribution adjustment. It safely converts 11kv and 33kv high-voltage grid electricity into usable 400v three-phase industrial power and 240v single-phase civilian power, solving the mismatch between high-voltage transmission voltage and terminal equipment working voltage. This core step-down capability is the key link to realize safe power transmission from municipal high-voltage power grids to terminal industrial, commercial and residential electricity loads.
Beyond basic voltage conversion, this 50kva-2000kva oil immersed power transformer undertakes grid load balancing and power loss reduction tasks. It reasonably distributes regional power load according to different capacity demands, avoids local grid overload or idle power waste, and improves the overall operation efficiency of medium-voltage power distribution systems. The optimized internal winding structure greatly cuts down no-load loss and load loss during operation, achieving energy-saving power distribution and effectively reducing long-term grid operation costs for power supply enterprises and industrial users.
Additionally, the equipment serves as critical power buffer and safety isolation equipment in power systems. Its high-strength oil insulation structure isolates high-voltage and low-voltage circuits, preventing high-voltage surge leakage and protecting terminal electrical equipment and power grid line safety. It stably supports continuous power supply for peak and off-peak load switching, ensuring uninterrupted power supply for key production and living scenarios.
3. Application Scenarios
3.1 Industrial Park & Factory Power Distribution
Medium and large capacity models ranging from 500kva to 2000kva are widely used in manufacturing factories, industrial parks, processing plants and mining enterprises. These industrial scenarios require stable 400v three-phase power to support mechanical equipment, production lines, motor devices and factory electrical systems. The 11kv and 33kv high-voltage input design adapts to industrial high-voltage access standards, while the strong overload resistance of oil immersed structure meets continuous high-load operation demands of industrial production, becoming the preferred power distribution equipment for industrial medium-voltage power supply systems.
3.2 Urban & Rural Civil Power Supply
Small and medium capacity specifications of 50kva to 400kva are perfectly suited for urban residential communities, rural centralized power supply areas, suburban towns and street commercial districts. The dual 400v and 240v output voltages can simultaneously support three-phase public power equipment and household single-phase electrical appliances, covering residential lighting, household electricity, community public facilities and commercial store power consumption. The equipment’s strong environmental adaptability allows stable operation in outdoor box-type substations and community power distribution rooms.
3.3 Municipal & Public Infrastructure Projects
This three phase step down oil immersed transformer is commonly deployed in municipal infrastructure projects including urban substations, road traffic facilities, water supply and sewage treatment plants, school campuses and hospital power systems. Public facilities require high power supply stability and safety, and the product’s reliable insulation performance and low failure rate can fully meet the long-term stable power demand of public service equipment, ensuring normal operation of municipal public utilities.
3.4 Remote Area & Independent Power Grid Projects
For remote mountainous areas, pastoral areas, highway service areas and isolated industrial zones with scattered power users and long power supply lines, this 11kv/33kv voltage class oil immersed transformer delivers excellent adaptability. Its fully sealed structure resists harsh outdoor environments such as wind, rain and high temperature, and the flexible capacity range from 50kva to 2000kva can match decentralized power load demands of different scales, effectively solving the power supply difficulty of off-grid and remote areas.
4. Product Features
4.1 Complete Capacity & Voltage Specification Coverage
This oil immersed step down transformer supports dual high voltage input of 11kv and 33kv, covering mainstream medium voltage grid specifications, and provides dual low voltage output of 400v and 240v to adapt to industrial three-phase and civilian single-phase power consumption. The full capacity range of 50kva to 2000kva realizes seamless matching from small-load civilian power supply to large-load industrial power supply, allowing users to select targeted models according to actual load demands without redundant configuration or insufficient power supply.
4.2 Stable Operation & Low Energy Loss
Adopting high-quality silicon steel sheet core and high-purity copper winding, the equipment effectively reduces magnetic flux leakage and current loss. The optimized three-phase balance design ensures uniform current distribution of each phase, low voltage regulation rate and minimal operation fluctuation. Compared with traditional transformers, this low loss oil immersed distribution transformer greatly reduces no-load and load power consumption during long-term operation, significantly lowering user’s electricity cost and grid operation loss, with outstanding energy-saving benefits.
4.3 Excellent Insulation & Environmental Adaptability
Filled with high-performance insulating mineral oil and equipped with a fully sealed welded steel tank structure, the transformer achieves excellent waterproof, dustproof, moisture-proof and insulation effects. It effectively avoids insulation aging and breakdown caused by external environmental interference, and can operate stably in high temperature, low temperature, humid and dusty harsh environments. The ONAN natural cooling system features uniform heat dissipation, no local overheating, and strong continuous load resistance, supporting long-term unattended outdoor operation.
4.4 High Safety & Long Service Life
The product is equipped with standard overvoltage, overload and short-circuit protection mechanisms, which can quickly cut off faulty circuits when encountering abnormal load or line faults, protecting terminal equipment and grid safety. The anti-corrosion and anti-rust treatment of the outer tank effectively delays equipment aging, and the internal components have strong oxidation resistance and fatigue resistance. Under normal maintenance conditions, the service life of this three phase oil immersed power transformer can reach more than 20 years, with extremely low later maintenance cost.
4.5 Simple Installation & Wide Compatibility
The overall structure is compact and standardized, supporting multiple installation methods such as indoor fixed installation and outdoor substation integration. It is compatible with most domestic and foreign 11kv/33kv medium-voltage power grid systems, with universal wiring standards and simple debugging procedures. The product has strong practicability and flexibility, suitable for various new construction, renovation and expansion power distribution projects, and is one of the most cost-effective medium-voltage step down transformers in the market.
5. Frequently Asked Questions (FAQ)
5.1 What is the difference between 400v and 240v output voltage, and how to choose?
The 400v three-phase output is mainly used for industrial heavy equipment, production lines, large mechanical devices and municipal three-phase power facilities, featuring high power and stable load capacity. The 240v single-phase output is dedicated to civilian scenarios such as household appliances, lighting systems and small commercial equipment. This 11kv 33kv step down oil immersed transformer supports dual voltage simultaneous output. Users can confirm the required voltage combination according to the actual proportion of industrial and civilian loads on site to meet mixed power supply demands.
5.2 What capacity model should I choose for factory and residential scenarios respectively?
For ordinary residential communities, street shops and small public facilities with low power load, 50kva to 400kva models are sufficient to meet daily stable power supply. For small and medium-sized processing factories and commercial comprehensive buildings with medium load demands, 500kva to 1000kva specifications are recommended. For large industrial parks, manufacturing plants and mining enterprises with long-term high-load operation, 1250kva to 2000kva high-capacity oil immersed transformers are the best choice to avoid long-term overload operation affecting equipment life.
5.3 Can this 11kv/33kv oil immersed transformer work stably in outdoor rainy and high-temperature environments?
Yes, this fully sealed oil immersed distribution transformer is specially optimized for outdoor harsh working conditions. The integral welded oil tank completely prevents rainwater and dust from entering, and the high-temperature resistant insulating oil maintains stable insulation performance in high-temperature seasons. The natural air cooling system ensures continuous heat dissipation during high-load operation in summer, and the low-temperature resistant internal structure can adapt to low-temperature environments in winter. With strong weather resistance, it can operate stably all year round in outdoor substations without frequent maintenance.
