6kv 33kv to 400v 50kva 100kva 400kva 500kva Power Distribution Transformers Oil Immersed Transformer

6kv - 33kv to 400v 50kva 100kva 400kva 500kva Power Distribution Transformers Oil Immersed Transformer

1. Product Description

This series of 6kv - 33kv to 400v oil immersed power distribution transformers covers four mainstream practical capacities including 50kva, 100kva, 400kva and 500kva, serving as universal medium-voltage step-down power conversion equipment for global power grid and industrial distribution systems. Designed to bridge the voltage gap between 6kV to 33kV medium-voltage transmission lines and standard 400V low-voltage terminal loads, this three-phase oil immersed transformer supports wide-range medium voltage input adaptation, fully covering low, medium and high medium-voltage grade demands of municipal power grids, industrial parks and rural grid upgrading projects.

Manufactured in full compliance with IEC 60076 and IEEE international power industry standards, this oil immersed power distribution transformer adopts high-quality low-loss silicon steel sheet core and high-purity copper winding structure, paired with mature ONAN oil natural air natural cooling technology and fully sealed welded steel tank design. The optimized Dyn11 vector group configuration ensures stable three-phase current balance and low harmonic output, effectively solving common problems such as voltage deviation, magnetic flux leakage and unbalanced load operation of traditional distribution transformers. Every capacity model from 50kva and 100kva small-medium loads to 400kva and 500kva large loads undergoes strict factory full-load aging testing, high-voltage withstand detection and insulation performance calibration to guarantee consistent operational stability in complex grid environments.

Different from single-voltage fixed transformers, this multi-range 6kV-33kV medium voltage to 400V low voltage transformer features ultra-wide voltage matching capability, compatible with multiple regional medium-voltage grid standards. The internal insulating system adopts anti-aging mineral insulating oil, which enhances dielectric strength and long-term operational durability. With standardized structural layout, flexible voltage regulation and graded capacity options, it is a cost-effective, high-reliability mainstream model for civil, commercial and industrial medium-to-low voltage power distribution conversion.

2. Core Purpose

The core purpose of this 6kv-33kv 400V oil immersed power distribution transformer is to realize safe, efficient and low-loss medium-to-low voltage power conversion and regional grid load balancing. It mainly undertakes the step-down task of 6kV to 33kV medium-voltage overhead lines and cable power supply systems, converting high medium-voltage power into standard 400V three-phase industrial and civil usable voltage, providing stable power source support for terminal electrical equipment and decentralized power distribution networks.

With diversified capacity grading of 50kva, 100kva, 400kva and 500kva, the equipment achieves precise load matching for different power consumption scenarios, avoiding energy waste caused by oversized configuration and equipment overload failure caused by undersized selection. The low-loss structural design effectively reduces no-load loss and on-load operation loss during power conversion, lowering long-term power transmission loss and operational costs for power supply enterprises and industrial users. It can effectively suppress grid voltage fluctuation, instantaneous current surge and harmonic interference, optimize regional power quality and improve the overall operation efficiency of medium-voltage distribution systems.

In addition, the fully sealed oil insulation structure provides reliable electrical isolation and fault protection. It blocks high-voltage surge and lightning impact from medium-voltage lines, prevents electric leakage and short-circuit faults, and protects the safety of low-voltage terminal equipment and power grid lines. It supports long-term unattended continuous operation and peak load switching, ensuring uninterrupted stable power supply for industrial production, municipal power distribution and public infrastructure scenarios.

3. Application Scenarios

3.1 Urban & Rural Power Grid Construction and Renovation

This 6kv-33kv to 400v oil immersed power distribution transformer is widely used in urban residential area power distribution, rural grid upgrading, suburban township power supply and regional decentralized power grid projects. The 50kva and 100kva small and medium-capacity models are perfectly suitable for scattered residential loads and village public facility power consumption, while 400kva and 500kva large-capacity units adapt to centralized residential clusters and urban community intensive power loads. The wide 6kV-33kV voltage adaptation range can flexibly match old and new grid voltage standards, effectively solving terminal voltage drop and unstable power supply problems in grid renovation.

3.2 Light & Medium Industrial Park Power Distribution

It serves as core power transformation equipment for small and medium manufacturing factories, food processing plants, mechanical workshops and light industrial parks. Industrial production lines, processing machinery and auxiliary electrical equipment all require stable 400V three-phase power supply. The 6kV-33kV multi-grade medium-voltage input adapts to different industrial factory power supply standards, and the graded capacity design from 50kva to 500kva accurately meets power demands from small workshop single-line operation to large park full-load operation. The oil immersed fully sealed structure adapts to dusty and high-temperature industrial workshop environments for long-term stable operation.

3.3 Municipal Public & Commercial Infrastructure

Suitable for shopping malls, office buildings, school campuses, hospital power distribution rooms, urban road lighting systems and sewage treatment facilities. Public and commercial scenarios feature complex load types and high requirements for power supply stability and safety. This series of power distribution transformers can stably convert medium-voltage grid power into standard 400V low-voltage power, supporting normal operation of office equipment, lighting systems, central air conditioning and public service equipment, ensuring safe and uninterrupted operation of municipal and commercial power systems.

3.4 Remote Engineering & Overseas Power Projects

Thanks to its ultra-wide 6kV-33kV voltage compatibility and multi-capacity options, the transformer is widely applied in remote field engineering, mining auxiliary power supply and overseas regional power grid construction. It can adapt to different medium-voltage grid standards in Asia, Africa and Southeast Asia, solving equipment matching difficulties of cross-regional power projects. The strong environmental adaptability and low-maintenance design are especially suitable for unattended remote power supply scenarios and outdoor engineering operation environments.

4. Product Features

4.1 Ultra-Wide 6kV-33kV Voltage Input Compatibility

Different from traditional single fixed medium-voltage transformers, this oil immersed power distribution transformer supports full-range input from 6kV low medium voltage to 33kV high medium voltage, covering almost all mainstream medium-voltage grid specifications in global civil and industrial power systems. It can stably output standard 400V low voltage without complicated parameter adjustment, realizing one machine multi-purpose and greatly improving equipment universality for power engineering projects, avoiding customized procurement costs caused by different grid voltage standards.

4.2 Complete Graded Capacity Matching

Covering four core capacities of 50kva, 100kva, 400kva and 500kva, the product accurately covers light, medium and large load application scenarios. The 50kva and 100kva models are compact and cost-effective for small scattered loads, while 400kva and 500kva high-capacity versions provide sufficient load margin for intensive and peak-fluctuating loads. Users can select the most suitable capacity according to actual on-site load conditions, realizing refined power supply matching and optimizing project cost performance.

4.3 Low-Loss Energy-Saving Operation Performance

Adopting high-permeability low-loss silicon steel core and high-purity integral copper winding, the transformer minimizes magnetic flux leakage and coil resistance loss. The optimized three-phase balance magnetic circuit design effectively reduces no-load current and operating temperature rise, with far lower no-load and load loss than traditional old-fashioned transformers. The efficient energy conversion structure greatly reduces daily power transmission loss, helping users save long-term electricity costs and meet industry energy-saving and emission-reduction requirements.

4.4 Fully Sealed Oil Immersed Environmental Adaptability

Equipped with integral fully sealed welded steel tank and high-anti-aging insulating oil, the equipment has excellent waterproof, dustproof, moisture-proof and anti-corrosion performance. The multi-layer anti-rust shell resists ultraviolet erosion, rain and snow corrosion and high and low temperature alternation, adapting to indoor workshop and outdoor substation all-weather operation environments. The mature ONAN natural oil cooling system ensures uniform and efficient heat dissipation, avoiding local overheating during long-term full-load and variable-load operation, with strong operational stability and long service life.

4.5 High Safety & Low Maintenance Cost

Built with complete overvoltage, overload, short-circuit and lightning surge protection mechanisms, the transformer can quickly cut off faulty circuits in case of grid abnormalities, effectively protecting terminal equipment and line safety. The fully sealed structure avoids insulating oil deterioration, leakage and dust accumulation, requiring no frequent oil replacement and routine maintenance. The standardized installation structure simplifies on-site construction and debugging, with low daily failure rate and later operation and maintenance costs, suitable for large-scale popularization in power grid and industrial distribution projects.

5. Frequently Asked Questions (FAQ)

5.1 How to select capacity among 50kva, 100kva, 400kva and 500kva for actual projects?

For single village power supply, scattered residential households and small public facilities with low and stable load, 50kva and 100kva capacity transformers are the most cost-effective choice. For medium-sized processing workshops, community centralized power supply and conventional commercial scenarios with moderate load, 400kva model is recommended. The 500kva large-capacity transformer is suitable for industrial parks with dense equipment, urban grid upgrading and scenarios with obvious peak load surges. Scientific capacity selection can avoid long-term overload operation or idle energy waste and extend transformer service life.

5.2 What are the advantages of 6kV-33kV wide voltage input compared with single-voltage transformers?

Traditional single-voltage medium transformers can only adapt to one fixed grid voltage, which is poor in flexibility and easy to cause equipment mismatch in grid renovation and cross-regional projects. This oil immersed power distribution transformer supports full coverage of 6kV to 33kV medium voltage grades, adapting to old low-voltage grids, new standard industrial grids and high-grade regional power grids. It eliminates the need for customized equipment replacement, shortens project design cycle and greatly improves the adaptability of power distribution equipment in complex and variable grid environments.

5.3 Is this 400V output oil immersed transformer suitable for long-term outdoor operation?

Yes, this series of power distribution transformers is specially optimized for outdoor and indoor dual-purpose operation. The fully sealed oil immersed structure and anti-corrosion shell can resist harsh outdoor environments such as wind, rain, high temperature and dust. The stable cooling and insulation system supports 24-hour continuous unattended operation, with low failure rate and strong weather resistance. Whether used in outdoor substations, rural overhead power distribution points or open industrial areas, it can maintain long-term stable 400V low-voltage output quality.